Prepared in cooperation with the City of Cambridge, Massachusetts,

Water Department

Surface-Water, Water-Quality, and Meteorological Data for 

the Cambridge, Massachusetts, Drinking-Water Source Area, 

Water Years 2007–08

Open-File Report 2011–1077

U.S. Department of the Interior

U.S. Geological Survey
Cover. Photograph of the Cambridge Reservoir at about 40 percent capacity, October 2007.
Surface-Water, Water-Quality, and 

Meteorological Data for the Cambridge, 

Massachusetts, Drinking-Water Source 

Area, Water Years 2007–08

By Kirk P. Smith

Prepared in cooperation with the City of Cambridge, Massachusetts, 

Water Department

Open-File Report 2011–1077

U.S. Department of the Interior

U.S. Geological Survey
U.S. Department of the Interior

KEN SALAZAR, Secretary

U.S. Geological Survey

Marcia K. McNutt, Director

U.S. Geological Survey, Reston, Virginia: 2011

For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, 

natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS

For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/

pubprod

To order this and other USGS information products, visit http://store.usgs.gov

Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. 

Government.

Although this report is in the public domain, permission must be secured from the individual copyright owners to 

reproduce any copyrighted materials contained within this report.

Suggested citation:

Smith, K.P., 2011, Surface-water, water-quality, and meteorological data for the Cambridge, Massachusetts, drinkingwater source area, water years 2007–08: U.S. Geological Survey Open-File Report 2011–1077, 109 p., at http://pubs.

usgs.gov/of/2011/1077.
iii

Contents

Abstract...........................................................................................................................................................1

Introduction.....................................................................................................................................................2

Purpose and Scope ..............................................................................................................................4

Description of Monitoring Network...................................................................................................4

Continuous Data Collection..........................................................................................................................4

Surface-Water Data .............................................................................................................................4

Water-Quality Data...............................................................................................................................6

Meteorological Data.............................................................................................................................6

Sample Collection and Analysis..................................................................................................................7

Data for the Cambridge Drinking-Water Source Area ............................................................................9

Surface-Water Data .............................................................................................................................9

Specific Conductance Data ................................................................................................................9

Water-Quality Data.............................................................................................................................24

Quality-Control Samples....................................................................................................................30

Meteorological Data...........................................................................................................................30

References Cited..........................................................................................................................................35

Figures

1. Map showing monitoring network for the Cambridge, Massachusetts,

drinking-water source area for water years 2007–08, eastern Massachusetts................3

2. Graph showing discharge from the Cambridge Reservoir as a percentage of water

entering the Stony Brook Reservoir, and discharge from the Stony Brook Reservoir

to the Charles River as a percentage of total inflow to the Stony Brook Reservoir

for water years 2007–08.............................................................................................................12

3. Graph showing monthly mean reservoir storage as a percentage of capacity for

water years 2007–08 for the Cambridge Reservoir, Stony Brook Reservoir, and the

Fresh Pond Reservoir.................................................................................................................14

4. Graph showing comparison of specific conductance for water years 2007–08 to

prior specific conductance data for U.S. Geological Survey station 01104415,

Cambridge Reservoir, unnamed tributary number 2, near Lexington, Massachusetts...17

5. Graph showing comparison of specific conductance for water years 2007–08 for

U.S. Geological Survey station 01104430, Hobbs Brook below Cambridge Reservoir

near Kendal Green, Massachusetts........................................................................................18

6. Graph showing comparison of specific conductance for water year 2007 for 

U.S.Geological Survey station 01104433, Hobbs Brook unnamed tributary number 1,

near Kendal Green, Massachusetts........................................................................................19

7. Graph showing comparison of specific conductance for water years 2007–08 for

U.S. Geological Survey station 01104455, Stony Brook, unnamed tributary number 1,

near Waltham, Massachusetts ................................................................................................20

8. Graph showing comparison of specific conductance for water years 2007–08 

for U.S. Geological Survey station 01104460, Stony Brook at Route 20 at 

Waltham, Massachusetts..........................................................................................................21
iv

9. Graph showing comparison of specific conductance for water years 2007–08 for

U.S. Geological Survey station 01104475, Stony Brook Reservoir, unnamed tributary

number 1, near Weston, Massachusetts................................................................................22

10. Graph showing comparison of specific conductance for water years 2007–08 for

U.S. Geological Survey station 422302071083801, Fresh Pond in Gate House at

Cambridge, Massachusetts ......................................................................................................23

11. Graph showing monthly mean reservoir storage as a percentage of capacity

and specific conductance for water years 2007–08 for U.S. Geological Survey

station 01104430, Hobbs Brook below Cambridge Reservoir, near Kendal Green,

Massachusetts............................................................................................................................24

12. Graph showing monthly precipitation for water years 2007–08 for U.S. Geological

Survey station 01104430, Hobbs Brook below Cambridge Reservoir, near Kendal

Green, Massachusetts...............................................................................................................34

Tables

1. Names, locations, drainage areas, and periods of record for U.S. Geological Survey

monitoring stations in the drinking-water source area for Cambridge,

Massachusetts, water years 2007–08.......................................................................................5

2. Hydrologic, water-quality, and meteorological parameters measured at each

continuous-monitoring station during water years 2007–08 in the drinking-water

source area for Cambridge, Massachusetts ...........................................................................6

3. Monthly mean discharge for U.S. Geological Survey stations in the drinking-water

source area for Cambridge, Massachusetts, for water years 2007–08.............................10

4. Monthly and annual totals for precipitation for U.S. Geological Survey stations in 

the drinking-water source area for Cambridge, Massachusetts, for water years 

2007–08 .........................................................................................................................................13

5. Monthly and annual statistics for daily mean specific conductance for U.S.

Geological Survey stations in the drinking-water source area for Cambridge,

Massachusetts, for water years 2007–08...............................................................................15

6. Physical properties of and concentrations of dissolved calcium, sodium, chloride,

sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons,

and suspended sediment in base-flow and stormflow water samples collected in 11 

subbasins and for water samples collected from the Fresh Pond intake structure

in the Cambridge, Massachusetts, drinking-water source area in water years

2007–08 .........................................................................................................................................38

7. Characteristics of selected pesticides detected in samples of base-flow and

stormflow collected in the Hobbs Brook and Stony Brook Reservoir Basins,

Massachusetts, water years 2007–08.....................................................................................26

8. Frequency of detection and maximum concentration of selected pesticides and

caffeine in six samples of base-flow and six samples of stormflow collected in the

Hobbs Brook and Stony Brook Basins and in four samples of raw-water collected

from the intake of the water-treatment facility at Fresh Pond, Massachusetts,

water years 2007–08...................................................................................................................29

9. Physical properties and concentrations of dissolved calcium, sodium, chloride,

sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples

collected in the Cambridge, Massachusetts, drinking-water source area during

water years 2007–08...................................................................................................................88

10. Recovery statistics for organic compounds in laboratory-spiked preparation

samples and recoveries for field-spiked samples for the Cambridge,

Massachusetts, drinking water source area during water years 2007–08.......................31
v

Conversion Factors, Datum, and Abbreviations

Multiply By To obtain

Length

inch (in.) 2.54 centimeter (cm)

inch (in.) 25.4 millimeter (mm)

inch (in.) 254 micrometer (μm)

foot (ft) 0.3048 meter (m)

mile (mi) 1.609 kilometer (km)

Area

square inch (in2

) 6.452 square centimeter (cm2)

square mile (mi2

) 2.590 square kilometer (km2) 

Volume

gallon (gal) 3.785 liter (L) 

Flow rate

million gallons per day 

(Mgal/d)

 0.04381 cubic meter per second (m3

/s)

million gallons per day per 

square mile [(Mgal/d)/mi2

]

1,461 cubic meter per day per square kilometer 

[(m3/d)/km2]

Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83).

Altitude, as used in this report, refers to distance above the vertical datum.

Specific conductance is given in microsiemens per centimeter at 25 degrees Celsius 

(μS/cm at 25°C).

Water- and sediment-quality constituents are expressed in milligrams per liter (mg/L), 

micrograms per liter (μg/L). Milligrams per liter is a unit expressing the concentration of 

chemical constituents in solution as weight (milligrams) of solute per unit volume (liter) of water. 

One thousand milligrams per liter is equivalent to one gram per liter. One thousand micrograms 

per liter is equivalent to one milligram per liter. For concentrations less than 7,000 mg/L, the 

numerical value is the same as for concentrations in parts per million (ppm).

Acronyms Used in Report

ASTM American Society for Testing and Materials

COV coefficient of variation

CWD City of Cambridge, Massachusetts, Water Department

HPLC high-performance liquid chromatography

ISO International Organization for Standardization

NIST National Institute of Standards and Technology

NWQL National Water Quality Laboratory

NTRU nephelometric turbidity ratio units

RPD relative percent difference

USEPA U.S. Environmental Protection Agency

USGS U.S. Geological SurveyThis page has been left blank intentionally.
This page has been left blank intentionally.
Surface-Water, Water-Quality, and Meteorological Data 

for the Cambridge, Massachusetts, Drinking-Water Source 

Area, Water Year 2007–08

By Kirk P. Smith

tributaries in the Cambridge, Massachusetts, drinkingwater source area were below the previous median monthly 

values and often were below the previous minimum monthly 

values for available data since water year 1997. The annual 

mean specific-conductance value for Fresh Pond Reservoir 

during water year 2007 was 483 μS/cm (microsiemens per 

centimeter), which was lower than the prior three water 

years. The monthly mean specific-conductance values for 

streamflow for Hobbs Brook below the Cambridge Reservoir 

for December through July 2008 were greater than the 75th 

percentile for historical data since water year 1997. These 

relatively high values were caused by the inflow of high 

specific conductance water from the tributaries when the 

reservoir water level was low at the onset of winter. Increased 

rainfall in the watershed beginning in February 2008 caused 

monthly mean specific-conductance values for Hobbs Brook 

to decrease to about 700 μS/cm by the end of the water year. 

Monthly mean specific-conductance values for many of the 

other USGS stations were higher than historical values for 

several months during the winter of water year 2008. The 

large amount of rainfall in the watershed also caused the 

monthly mean specific conductance at these stations to decline 

to near-median values or to values within the interquartile 

range for available historical data. The annual mean specific 

conductance for Fresh Pond Reservoir during water year 2008 

was 497 μS/cm, slightly greater than the corresponding value 

for the prior year.

Water samples were collected in nearly all of the 

subbasins in the Cambridge drinking-water source area and 

from Fresh Pond during the study period. Discrete water 

samples were collected during base-flow conditions with an 

antecedent dry period of at least 3 days. Composite samples, 

consisting of as many as 100 subsamples, were collected 

by automatic samplers during storms. Concentrations of 

most dissolved constituents were generally lower in samples 

of stormwater than in samples collected during base-flow 

conditions; however, the difference between the average 

concentration of total phosphorus in samples of stormwater 

and for samples collected during base-flow conditions in the 

tributaries ranged from 0.10 to 0.23 mg/L (milligrams per 

liter). Concentrations of dissolved calcium, sodium, chloride, 

Abstract

Records of water quantity, water quality, and 

meteorological parameters were continuously collected from 

three reservoirs, two primary streams, and five subbasin 

tributaries in the Cambridge, Massachusetts, drinking-water 

source area during water years 2007–08 (October 2006 

through September 2008). Water samples were collected 

during base-flow conditions and storms in the Cambridge 

Reservoir and Stony Brook Reservoir drainage areas and 

analyzed for dissolved calcium, sodium, chloride, and sulfate; 

total nitrogen and phosphorus; and polar pesticides and 

metabolites. Composite samples of stormwater also were 

analyzed for concentrations of total petroleum hydrocarbons 

and suspended sediment in one subbasin in the Stony Brook 

Reservoir drainage basin. These data were collected to assist 

watershed administrators in managing the drinking-water 

source area and to identify potential sources of contaminants 

and trends in contaminant loading to the water supply. 

Monthly reservoir contents for the Cambridge Reservoir 

ranged from about 30 to 95 percent of capacity during water 

years 2007–08. Monthly reservoir contents for the Stony 

Brook Reservoir ranged from about 47 to 91 percent of 

capacity during water years 2007–08, while the monthly 

reservoir storage values for Fresh Pond Reservoir were 

maintained at greater than 92 percent of capacity. If the 

average water demand by the city of Cambridge is assumed 

to be 15 million gallons per day, the volume of water released 

from the Stony Brook Reservoir to the Charles River during 

water years 2007–08 represents an annual surplus of about 

107 and 94 percent, respectively. The annual precipitation total 

of about 47 in (inches) recorded at the Cambridge reservoir 

during water year 2007 was about 5 to 21 percent lower than 

recorded totals for the previous four water years, whereas the 

annual precipitation total of about 62 in. during water year 

2008 was about 5 to 32 percent higher than recorded totals for 

water years 2002–07.

In general, most monthly mean specific-conductance 

values for water year 2007 for U.S. Geological Survey 

(USGS) stations on the two primary streams and four subbasin 
2 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

and sulfate in water samples collected in the drinking-water 

source area (excluding Fresh Pond Reservoir) ranged from 

2.99 to 75.8 mg/L, 7.47 to 534 mg/L, 11.4 to 1,050 mg/L, 

and 2.85 to 47.2 mg/L, respectively. The concentration of 

total phosphorus and total nitrogen in water samples for 

all subbasins ranged from 0.006 to 0.53 mg/L, and 0.42 to 

3.14 mg/L, respectively. 

In 3 of 81 water samples, measurements of pH were 

less than the U.S. Environmental Protection Agency 

(USEPA) secondary drinking-water standard of 6.5 pH units. 

Concentrations of dissolved chloride in all water samples 

collected during base-flow conditions from USGS stations 

01104410, 01104415, 01104420, 01104433, and 01104455 

were near or exceeded the USEPA secondary drinking-water 

standard of 250 mg/L. All samples collected during baseflow conditions at USGS stations 01104415 and 01104433, 

and five of six samples collected at USGS station 01104455 

exceeded the secondary drinking-water standard for chloride. 

The concentration of chloride in composite samples of 

stormwater also exceeded the standard at USGS stations 

01104415, 01104433, and 01104455 for a few winter storms. 

Concentrations of dissolved sulfate in all water samples were 

below the USEPA secondary drinking-water standard of 

250 mg/L. Concentrations of dissolved sodium for all samples 

collected in the drinking-water source area exceeded the 

Massachusetts drinking water guideline (20 mg/L) with the 

exception of three composites samples of stormwater collected 

at USGS stations 01104455 and 01104475.

Eighteen pesticides and caffeine were detected in water 

samples collected in the primary streams and tributaries to 

the Cambridge Reservoir and Stony Brook Reservoir, and 

in raw water collected from the Cambridge water-treatment 

facility intake from the Fresh Pond Reservoir during water 

years 2007–08. Caffeine was detected in 54 percent of 

80 water samples at concentrations ranging from 0.004 to 

0.557 micrograms per liter. Caffeine was detected in water 

samples collected at all USGS sampling stations except for 

01104390, 01104410, 01104453. Imidacloprid, siduron, and 

norflurazon were the most frequently detected pesticides, with 

measureable concentrations in 29 to 32 percent of all water 

samples collected in the drinking-water source area. Caffeine, 

2,4-D, and benomyl were more frequently detected in water 

samples collected during storms than in water samples 

collected during base-flow conditions. Imidacloprid, siduron, 

and 2,4-D were frequently detected in water samples from 

the tributaries to the Cambridge and Stony Brook Reservoirs. 

Trace amounts of caffeine, carbaryl, dinoseb, norflurazon, 

and siduron were also detected in water from the Fresh 

Pond Reservoir.

Introduction

Hydrologic and water-quality monitoring is important for 

the effective management and protection of drinking-water 

supplies. Both the quantity and the quality of water are 

monitored because these factors determine the physical, 

chemical, and biological state of the water supply. Without 

accurate information on the past and current condition of the 

water supply, effective preservation and remediation programs 

cannot be implemented or evaluated.

The U.S. Geological Survey (USGS) works closely with 

municipal water suppliers throughout the Nation to address 

specific water problems by conducting hydrologic- and 

water-quality-monitoring programs and detailed investigations 

(Patterson, 1997). One such program, conducted during 

1997–98 by the USGS in cooperation with the city of 

Cambridge, Massachusetts, Water Department (CWD), was 

designed to identify sources of contaminants in the drinkingwater source area for the city (Waldron and Bent, 2001). 

Subsequently the USGS, in cooperation with the CWD, 

designed and implemented a water-monitoring network in the 

drinking-water source area. Data from this network have been 

published periodically in various USGS reports (Smith, 2005, 

2007 and 2008; Socolow and others, 1999, 2000, 2001, 2002, 

2003, and 2004; U.S. Geological Survey, 2009).

The CWD supplies approximately 15 Mgal/d (million 

gallons per day; Waldron and Bent, 2001) to more than 

100,000 customers. Most of this water is obtained from three 

primary storage reservoirs—Cambridge Reservoir (also known 

as the Hobbs Brook Reservoir), Stony Brook Reservoir, 

and Fresh Pond Reservoir—in parts of Lexington, Lincoln, 

Waltham, Weston, and Cambridge (fig. 1). The watershed for 

the Cambridge Reservoir includes Hobbs Brook and three 

unnamed tributaries that discharge directly into the reservoir. 

Water is discharged from the southern end of the Cambridge 

Reservoir into Hobbs Brook, which receives additional 

water from an unnamed tributary about 0.5 mi (miles) below 

the reservoir. Hobbs Brook joins with Stony Brook about 

1.6 mi downstream from the reservoir and flows south to the 

Stony Brook Reservoir. The area above this confluence is 

herein referred to as the Hobbs Brook Basin. Two unnamed 

tributaries flow into Stony Brook about a 0.25 mi north of 

the Stony Brook Reservoir. In addition to Stony Brook, 

an unnamed tributary flows directly into the Stony Brook 

Reservoir on the southwestern side of the reservoir. Additional 

water enters both reservoirs from other minor tributaries and 

roadway and parking-lot storm drains. Water from Stony 

Brook Reservoir is piped through an aqueduct by the CWD 

directly to Fresh Pond Reservoir, where it is stored prior to 

treatment. Overflow and controlled discharges from the Stony 

Brook Reservoir flow into the Charles River in Waltham.

The drainage basin contributing water to these reservoirs 

has undergone rapid development since the 1990s and 

encompasses major transportation corridors (Interstate 95, 

Routes 2, 2A, 20, and 117), as well as large areas of industrial, 

commercial, and high-density residential land use. Because 

the city of Cambridge owns less than 5 percent of the land 

in the basin contributing to its water supply, the CWD relies 

heavily on monitoring to provide information for optimizing 

the management of its reservoirs for water quality and 
Introduction 3

Smith_fig 01

Lincoln

LEXINGTON

LINCOLN

WALTHAM

WESTON

Charles River

01104415

01104430

01104433

01104455

01104460

01104475

01104480

01104453

01104390

01104405

01104420

01104410

0

0

1

1

2 MILES

2 KILOMETERS

Base from U.S. Geological Survey, 

MassGIS, Cambridge Water Department, 

Harvard Design and Mapping, and Boston Edison. 

EXPLANATION

01104460

Hobbs Brook basin

Stony Brook reservoir basin 

Forested and nonforested wetlands

Charles River basin

Town boundary

Basin boundary

Subbasin boundary

Continuous monitoring station and

number

Primary sampling station

Secondary sampling station

Cambridge Reservoir watershed

71°15'

42°22'30"

71°19'

42°27'

71°11'

Hobbs Brook

Trapelo Road

128 Cherry Brook

Stony Brook

Hobbs Brook

2A

2

95

Cambridge

Reservoir

Stony Brook

Reservoir 20

Sandy

Pond

117

42°

73° 72° 

71°

70°

MASSACHUSETTS

41°30'

42°30'

0

0

50 KILOMETERS

50 MILES

MASSACHUSETTS

CAMBRIDGE

NEWTON

WALTHAM

LINCOLN

LEXINGTON WINCHESTER

WESTON

MEDFORD

ARLINGTON

BELMONT

128

2

2A

20

117

95

90

Aqueduct to Fresh PondAqueduct to Fresh Pond

Hobbs

Brook

Stony Brook Basin

Basin

PAYSON PARK

RESERVOIR

Aqueduct to Fresh Pond

STONY BROOK

RESERVOIR

FRESH

POND

CAMBRIDGE

RESERVOIR

Charles River

42o

26'

71o 71 08' o

19'

42o

20'

0

0

5 MILES

5 KILOMETERS

422302071083801 

Cambridge

Reservoir

Watershed

Charles

River

Basin

Figure 1. Monitoring network for the Cambridge, Massachusetts, drinking-water source area for water years 

2007–08, eastern Massachusetts.
4 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

quantity. The USGS monitoring network provides nearreal-time information that assists the CWD in responding 

rapidly to water-quality changes caused by accidental or 

intentional contamination. This information also benefits 

the CWD, other municipalities, and State agencies involved 

with water-resource development and management in the 

Charles River Basin by enhancing their understanding of 

the relation between local drinking-water-management 

practices and regional issues of water supply and hydrologicsystem response.

Purpose and Scope

This report presents records of water quantity, water 

quality, and meteorological parameters collected in the 

Cambridge, Massachusetts, drinking-water source area during 

water years 2007–08 (October 2006 through September 2008). 

It describes the monitoring network and the data-collection 

methods for all types of data. It also describes the chemical 

characteristics of water samples collected during base-flow 

conditions and during storms from streams and tributaries to 

Hobbs Brook and Stony Brook in the Stony Brook Reservoir 

Basin, and of water samples collected from the raw-water 

intake at the Cambridge water-treatment facility. 

Description of Monitoring Network

Stations installed and operated by the USGS in the 

drinking-water source area continuously monitored various 

hydrologic, water-quality, and meteorological parameters, 

including stream stage, stream-water temperature, stream 

specific conductance, reservoir altitude, air temperature, and 

precipitation. Stations were selected for continuous monitoring 

on the basis of the necessity for water-supply regulation by 

the CWD and of information gained in a previous USGS 

investigation (Waldron and Bent, 2001) that identified specific 

areas as potentially important sources of contaminants. 

Attributes of the monitoring stations are listed in table 1; 

locations of stations selected for continuous monitoring are 

shown in figure 1. 

Stream-stage measurements were recorded at monitoring 

stations at the outlet of the Cambridge Reservoir, on an 

unnamed tributary to Stony Brook, on Stony Brook, and 

at the outlet of Stony Brook Reservoir (USGS stations 

01104430, 01104453, 01104460, and 01104480, respectively). 

The USGS station 01104453 was decommissioned at the 

end of water year 2007 as a result of construction activity 

in the monitoring area. Water temperature and specific 

conductance measurements were recorded at the outlet 

of the Cambridge Reservoir and at Stony Brook (USGS 

stations 01104430 and 01104460). A water temperature and 

specific conductance monitor was installed at the outlet of 

the Stony Brook Reservoir (01104480) late in the summer 

of 2008. Physical parameters monitored at these sites are 

listed in table 2. These data were recorded at a frequency 

of 10 minutes and—with the exception of data from USGS 

station 01104453, which was not equipped with telemetry—

were uploaded to a USGS database hourly by phone modem. 

In addition to measurements made on these streams, streamstage measurements and water-quality measurements were 

recorded at monitoring stations on four of the small tributaries 

(USGS stations 01104415, 01104433, 01104455, and 

01104475). The USGS station 01104433 was decommissioned 

at the end of water year 2007. Because the drainage areas of 

these sites are small, each less than 1 mi2 (square mile), and 

contain many roadways, parking lots, and other impervious 

surfaces (Waldron and Bent, 2001), the hydrologic responses, 

and often the water-quality responses, change rapidly. To 

document these responses effectively, the monitoring stations 

recorded stream-stage and water-quality measurements 

at variable frequencies, as often as every minute. These 

data were uploaded to a USGS database hourly by digital 

cellular modem. 

Measurements of reservoir altitude, precipitation, and 

air temperature were recorded at the Cambridge, Stony 

Brook, and Fresh Pond Reservoirs (USGS stations 01104430, 

01104480, and 422302071083801). Measurements of reservoir 

water quality also were recorded at the Fresh Pond Reservoir. 

Physical parameters monitored at these sites are listed in 

table 2. These data were recorded at a frequency of 10 to 

15 minutes and were uploaded to a USGS database on an 

hourly basis by phone modem. 

Continuous Data Collection

The monitoring network provides near-real-time 

information used to manage the quantity and quality of water 

in the CWD drinking-water source area. Available data from 

each station are available to watershed managers through the 

USGS Massachusetts-Rhode Island Water Science Center 

home page (http://ma.water.usgs.gov).

Surface-Water Data

Basic data collected at the monitoring stations include 

records of stream stage and measurements of discharge of 

streams, and water altitude and contents of reservoirs. In 

addition, observations of factors affecting the stage-discharge 

relation or the altitude-contents relation, weather records, and 

other information are used to supplement the basic data in 

determining the daily flow or water in storage. Measurements 

of discharge are made with a current meter or acoustic Doppler 

current profiler by standard USGS methods (Buchanan and 

Somers, 1968, 1969; Carter and Davidian, 1968; Kennedy, 

1983 and 1984; Oberg and others, 2005; Rantz and others, 

1982). The methods are consistent with the American Society 

for Testing and Materials (ASTM) standards and generally 

follow the standards of the International Organization for 

Standards (ISO).
Continuous Data Collection 

5

Table 1. Names, locations, drainage areas, and periods of record for U.S. Geological Survey monitoring stations in the drinking-water source area for Cambridge, Massachusetts, water years 2007–08.[USGS, U.S. Geological Survey; mi2, square mile; latitude and longitude in degrees, minutes, and seconds]

Station name USGS station number Latitude Longitude Draingage area (mi2) Period of record

Stony Brook at Kendal Green 01104390 42 22 36 71 16 55 10.4 03/07/97–09/17/98; 07/18/05–05/15/07Hobbs Brook at Mill Street near Lincoln 01104405 42 26 11 71 16 12 2.16 03/05/97–09/16/98; 07/18/05–05/15/07Cambridge Reservoir, unnamed tributary number 1, near Lexington 01104410 42 26 15 71 15 53 2.10 03/05/97–09/16/98; 07/18/05–05/15/07Cambridge Reservoir, unnamed tributary number 2, near Lexington 01104415 42 26 09 71 15 38 0.41 03/06/97–09/22/98; 10/01/00–09/30/08Cambridge Reservoir, unnamed tributary number 3, near Lexington 01104420 42 25 11 71 15 29 0.73 04/09/97–09/16/98; 07/18/05–05/15/07Hobbs Brook below Cambridge Reservoir near Kendal Green 01104430 42 23 53 71 16 26 6.86 03/06/97–09/30/08Hobbs Brook, unnamed tributary 1 near Kendal Green 01104433 42 23 28 71 16 18 0.36 10/23/97–09/15/05; 06/28/04–10/16/07Stony Brook, unnamed tributary 2 near Weston Station 01104453 42 22 17 71 16 31 2.23 11/30/05–10/17/07Stony Brook, unnamed tributary 1 near Waltham 01104455 42 22 21 71 16 15 0.48 10/22/97–09/22/98; 10/01/00–09/30/08Stony Brook at Route 20 at Waltham 01104460 42 21 08 71 16 16 22.0 03/07/97–10/28/98; 05/14/02–09/30/08Stony Brook Reservoir, unnamed tributary 1 near Weston 01104475 42 21 16 71 16 07 0.85 11/06/97–09/17/98; 08/26/04–09/30/08Stony Brook Reservoir at dam near Waltham 01104480 42 21 20 71 15 56 23.7 01/30/98–09/30/08Fresh Pond in gate house at Cambridge 422302071083801 42 23 02 71 08 38 0.00 10/01/03–09/30/08
6 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Table 2. Hydrologic, water-quality, and meteorological parameters measured at each continuous-monitoring station during water 

years 2007–08 in the drinking-water source area for Cambridge, Massachusetts.

[X, indicates parameter is measured]

Parameter U.S. Geological Survey station number

01104415 01104430 01104433 01104453 01104455 01104460 01104475 01104480 422302071083801

Stream water level X X X X X X X X

Reservoir water level X X X

Precipitation X X X

Air temperature X X X

Water temperature X X X X X X X X

Specific conductance X X X X X X X X

To determine streamflow at each USGS monitoring 

station in the CWD drinking-water source area, dischargerating tables for any stage are prepared from stage-discharge 

curves (Rantz and others, 1982). The daily mean discharge 

is computed from these stage and rating tables, and then the 

monthly and yearly mean discharges are computed from 

these daily values (U.S. Geological Survey, 2009). If the 

stage-discharge relation for a station is changed temporarily 

by aquatic growth, scour, or debris in the control section, 

the daily mean discharge is computed by the shifting-control 

method (Rantz and others, 1982). 

For the USGS monitoring stations at reservoirs in the 

CWD drinking-water source area, altitude-capacity tables 

giving the volume for any reservoir water altitude are prepared 

from water altitude-volume relation curves defined by surveys 

conducted by the USGS in 2008. From the altitude-capacity 

tables, the daily, monthly, or yearly changes in volume are 

computed (U.S. Geological Survey, 2009). 

Water-Quality Data

Continuous water-temperature and specific-conductance 

data were collected from water-quality monitors in each 

stream, tributary, and from the Fresh Pond reservoir. The 

accuracy of the water-quality records depends primarily on 

the rate of sensor drift, sensor fouling, and debris collection. 

Typically, sensors became fouled by aquatic growth more 

rapidly in the warmer months. In most cases, corrections for 

fouling and drift can be applied to the data to improve their 

accuracy (Wagner and others, 2006a). For parameters other 

than water temperature, such corrections were made on the 

basis of the performance of the sensor before and after sensor 

maintenance, and by noting the response of the clean sensor 

after placing it in several standardized solutions. The accuracy 

of water-temperature data is determined by comparing 

measurements made by the monitoring system and by an 

independent probe calibrated against a National Institute of 

Standards and Technology (NIST) traceable thermometer. 

The daily maximum, minimum, and mean values are 

computed (U.S. Geological Survey, 2009) from instantaneous 

measurements of water temperature and specific conductance; 

monthly statistics are then computed from daily values.

Water samples were collected in nearly all of the 

subbasins in the Cambridge drinking-water source area and 

from the raw-water intake to the treatment plant at Fresh Pond 

Reservoir during water year 2007; a water sample also was 

collected at USGS station 01104475 and the raw-water intake 

to the treatment plant at Fresh Pond Reservoir during water 

year 2008. Six water samples were collected manually during 

base-flow conditions and six composite samples of stormwater 

were collected with automatic samplers at most of the 

primary sampling sites (USGS stations 01104415, 01104433, 

01104455, 01104460, and 01104475). Four samples of water 

from Fresh Pond Reservoir were collected from the rawwater intake at the Cambridge water treatment plant. Water 

samples also were collected from secondary sampling sites 

(USGS stations 01104390, 01104405, 01104410, 01104420, 

01104430, and 01104453) during two synchronous sampling 

rounds on December 11–12, 2006, and on May 15, 2007, 

when samples of base-flow water were collected at primary 

sampling stations (fig. 1) during the same day. Various qualityassurance samples were also collected to determine bias 

and precision associated with the sample data. All samples 

were analyzed for physical properties and concentrations of 

dissolved calcium, sodium, chloride, sulfate, total nutrients, 

and polar pesticides and metabolites.

Meteorological Data

Precipitation data were collected with heated tippingbucket precipitation gages that measure the volume of rain or 

melted snow in increments of 0.01 in. (inch). The precipitation 

gages at the Cambridge Reservoir and Stony Brook 

Reservoir include wind screens that reduce bias generated 

by precipitation missing the instrument. Precipitation 

data are summed for each day and then for each month 
Sample Collection and Analysis 7

(U.S. Geological Survey, 2009). In general, the accuracy 

of precipitation data is assured by proper maintenance and 

calibration of the device. Precipitation measurements are 

affected by strong winds and are subject to errors, especially 

when the precipitation is in the form of snow. These errors 

generally result in underestimation of the total rainfall at 

a station.

Air-temperature data were collected with thermistors 

housed in gill radiation shields. The probes are installed 

approximately 8 ft (feet) above ground surface. The maximum, 

minimum, and mean temperature values are computed for 

each day (U.S. Geological Survey, 2009). Monthly statistics 

are then computed from daily values. The accuracy of airtemperature data is determined by comparing measurements 

made by the monitoring system and by an independent probe 

calibrated against a NIST traceable thermometer.

Sample Collection and Analysis

Water samples were collected during base-flow 

conditions and during rain and mixed precipitation storms 

in selected streams in the drinking-water source area during 

water years 2007–08. Samples of water from Fresh Pond 

Reservoir also were collected from the raw-water intake at 

the Cambridge water treatment plant. All water samples were 

analyzed for physical parameters; dissolved calcium, sodium, 

chloride, and sulfate; total nitrogen and total phosphorus; 

dissolved caffeine; and 60 pesticides and metabolites. 

Concentrations of total petroleum hydrocarbons and 

suspended sediment (including the percentage of particles less 

than 0.063 mm (millimeters) in diameter) also were measured 

in composite samples of stormwater collected at USGS station 

01104455 to provide baseline information prior to proposed 

redevelopment activities within the tributary subbasin.

Water samples were collected during base-flow 

conditions and during storms at five continuously monitored 

stations in the Hobbs Brook Basin and Stony Brook Reservoir 

Basin. Four stations are located on small tributaries (USGS 

monitoring stations 01104415, 01104433, 01104455, and 

01104475) and one station is located on Stony Brook 

(USGS monitoring station 01104460; fig. 1 and table 1). 

Water samples were collected during base-flow conditions 

on December 11–12, 2006, and May 15, 2007, at several 

previously monitored USGS stations (Waldron and Bent, 

2001) in the Hobbs Brook Basin and Stony Brook Reservoir 

Basin. These secondary sampling stations (fig. 1 and table 1) 

include Stony Brook above the confluence of Hobbs Brook, 

Hobbs Brook above the Cambridge Reservoir, two unnamed 

tributaries to the Cambridge Reservoir, Hobbs Brook below 

the Cambridge Reservoir, and an unnamed tributary to Stony 

Brook (USGS stations 01104390, 01104405, 01104410, 

01104420, 01104430, and 01104453, respectively). Samples 

of stream water were collected manually (Wilde and others, 

1999) under base-flow conditions with an antecedent dry 

period of at least 3 days. During storms, water samples 

for chemical analysis were collected with an automatic 

sampler controlled by a datalogger. The first sample was 

collected when flow exceeded a preset discharge threshold, 

and subsequent samples were collected at flow-proportional 

intervals. The automatic collection of samples continued for a 

specified amount of time after the final peak rate of flow. The 

time value for each site was calculated on the basis of the size 

of each drainage area, except for USGS station 01104460, 

using the equation

T = A0.2, (1)

where T is the time value in days, A is the area of the 

drainage basin in square miles, and 0.2 is a constant (Bedient 

and Huber, 2002). For USGS station 01104460, the area 

upstream of the Cambridge Reservoir is subtracted from the 

total drainage area because the flow from the upper basin 

is regulated and not affected by stormwater runoff. Each 

automatic sampler was configured to hold one 20L (liter) glass 

bottle and fitted with a pre-cleaned 1/2-in. inner diameter 

Teflon intake and discharge tube, and a short piece of silicon 

pump-head tube. 

A multi-step process was used to clean all wetted parts 

associated with the automatic sampler and the processing 

equipment before each sample collection. The initial 

cleaning consisted of washing the interior and exterior 

with a phosphate-free laboratory-grade soap and tap water, 

scrubbing surfaces with a plastic brush, and rinsing with tap 

water. Circulating the solution through the tubing cleaned 

the interior of the sampler tubing. Lint-free wipes were 

forced hydraulically through the tubing to remove internal 

deposits or films that were difficult to remove by circulating 

solution alone. After the components dried, they were placed 

in a large stainless-steel pan in a fume hood and immersed 

in Optima-grade methanol. A Teflon diaphragm pump was 

used to circulate the methanol through the sampler tubing. 

The components were allowed to soak, with occasional 

agitation, for a minimum period of about 4 hours. After 

appropriately dispensing the waste solution, all components 

except the tubing were rinsed with methanol and air-dried in 

a fume hood over night. Because the rate of cleaning-solution 

volatilization is limited within the sampler tubing, the tubing 

was purged with purified air for approximately 20 minutes. All 

components were thoroughly rinsed with deionized water until 

the specific conductance of the waste rinse water was less than 

1 μS/cm (microsiemen per centimeter). 

Water samples were processed in the USGS 

Massachusetts Water Science Center laboratory in 

Northborough, Massachusetts, at the conclusion of each 

sampling round or storm. For water samples collected 

during base-flow conditions when the flow and depth of 

water in the streams were small, the water generally was 

collected in the centroid of the stream in separate bottles 

designated for whole water, dissolved constituents, and 

organic compounds; therefore, only limited splitting was 
8 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

necessary at the laboratory. For water samples collected 

during storms, subsamples to be analyzed for inorganic 

and organic constituents were split directly from the 

20L glass bottle by transferring the water with a Teflondiaphragm pump while the contents of the sample bottle 

were homogenized with a stainless-steel laboratory mixer. 

Water to be analyzed for dissolved inorganic constituents was 

filtered through a 600-cm2 (square centimeter) capsule filter 

with a 0.45-micrometer pore size. Water to be analyzed for 

dissolved caffeine, pesticides, and pesticide metabolites was 

filtered through a 142-mm pre-combusted glass-fiber filter 

with a nominal 0.7-mm pore diameter to remove suspended 

particulate matter. After the samples were processed, they 

were packed in ice and shipped overnight to the USGS 

National Water Quality Laboratory (NWQL), in Denver, 

Colorado, where they were analyzed for concentrations of 

dissolved calcium, sodium, chloride, sulfate, total nutrients, 

and polar pesticides and metabolites (American Public Health 

Association, 1998; Fishman, 1993; Fishman and Friedman, 

1989; Furlong and others, 2001; Patton and Kryskalla, 2003). 

The reliability of the chemical data was ensured by the 

preparation and analysis of several types of quality-control 

samples. These quality-control samples include 1 sourcesolution blank, 2 field blanks, 9 replicate samples, and 

4 field-matrix spike samples and 2 replicate field-matrix 

spike samples. These analyses provided the basis for the 

interpretation of chemical data collected in the drinking-water 

source area.

Source-solution blanks were prepared from deionized 

water produced by a laboratory-grade water-purification 

system that uses ion-exchange packs and reverse osmosis. The 

source-solution water was stored in pre-cleaned glass bottles 

until it was subsequently used as blank water for the collection 

of field blanks. 

A field blank is used to test for positive bias that can 

result from contamination during any stage of sample 

collection, processing, or analysis. One field blank was 

collected during sampling at base-flow conditions in April 

2007 and another field blank was collected in preparation for 

the sampling of stormwater in July 2007. During collection 

of base-flow samples, the field blank was collected by 

transferring blank water from the holding bottle to the samplecollection bottles. It was then processed in a manner consistent 

with the collection of other environmental samples. The 

second field blank was collected by the automatic sampler in 

preparation for storm sampling. These samples were collected 

by pumping blank water through the automatic sampler tubing 

and into the collection bottle, and processing it in a manner 

consistent with the collection of environmental samples 

of stormwater. 

Replicate samples are samples thought to be identical in 

composition to the environmental samples. Replicate samples 

provide a measure of bias and variability for the method of 

sample collection, sample processing (splitting, filtering, 

and preservation), and laboratory analysis, and for effects 

such as analyte degradation that can occur prior to laboratory 

analysis. A total of nine replicate samples were collected 

during base-flow conditions and during storms. Two replicate 

samples were collected to test for potential differences 

between samples collected manually and samples collected 

concurrently by automatic samplers. Five other replicate 

samples were collected manually during base-flow conditions. 

The remaining two replicates were collected during storms 

by independent automatic samplers that were triggered 

simultaneously. These replicates were used to test for potential 

differences between samples collected with the same method 

during periods of rapidly changing flow and water quality.

Field-matrix spikes are quality-control samples in 

which known amounts of target compounds are added to 

environmental replicate-split samples and then measured. 

The degree of recovery for each target analyte added to the 

environmental sample is used to determine the bias and 

variability attributed to the amount of degradation of target 

analytes during holding and shipment to the laboratory, 

the analytical method, and interferences contained in the 

environmental sample that mask or enhance determinations 

of the target analytes, or matrix effects. Replicate fieldmatrix spikes were also submitted to the NWQL for analysis. 

Similarly, known amounts of target compounds are added 

to replicate field-matrix spike samples. These samples are 

processed in the same manner as the field-matrix spike such 

that the samples are expected to be essentially identical 

in composition. Comparing the recovery of a field-matrix 

spike replicate to the recovery of the paired field-matrix 

spike provides a measure of the variability attributed to the 

aforementioned processes that can affect the concentration of 

each analyte.

In addition to the quality-assurance samples collected 

during this project, the NWQL routinely analyzes various 

quality-control samples, including laboratory reagent blanks, 

interference check solutions, laboratory control samples, 

standard reference materials, laboratory reagent spike samples, 

and laboratory duplicate samples to test and track method 

performance (Garbarino and others, 2006), and Furlong and 

others, 2001). The NWQL also adds surrogate compounds 

to all samples for determinations of pesticides and caffeine. 

Surrogate compounds, such as 2,4,5-T, caffeine-13C, and 

barban, are expected to perform similarly to the compounds 

being analyzed in the laboratory method. Because these 

compounds are not normally found in the environment, the 

recovery of the surrogate compounds can be used to qualify 

the performance of the analysis. When the difference between 

surrogate recoveries is outside acceptable control limits 

(usually low) as a result of an identified process failure, the 

results for the associated analytes are usually flagged by the 

NWQL with the “E” code (indicating an estimated value), or 

even deleted if the recovery is poor. Report levels may also be 

adjusted accordingly under some circumstances.
Data for the Cambridge Drinking-Water Source Area 9

Data for the Cambridge Drinking-Water 

Source Area

The data presented in this report can be used by the 

watershed managers in the city of Cambridge, Massachusetts 

to optimize the management of the drinking-water-supply 

reservoirs for water quality and quantity. The data allow 

clarification of the relation of reservoir management practices 

and current conditions to trends in the quantity and quality of 

water in the subbasins of the hydrologic system. 

Surface-Water Data

From October 2006 through June 2007, monthly mean 

discharge from the Cambridge Reservoir accounted for less 

than 45 percent of the water entering the downstream Stony 

Brook Reservoir (fig. 2); this estimate was obtained by 

dividing the monthly mean discharges measured at USGS 

station 01104430 by the sum of monthly mean discharges 

measured at USGS stations 01104460, and 01104475 

(table 3). During this period, between 2 and 83 percent of 

the water entering the Stony Brook Reservoir was released 

to the Charles River (fig. 2); this estimate was obtained 

by dividing the sum of monthly mean reservoir outflows 

measured at USGS station 01104480 by the sum of monthly 

mean discharges measured at USGS stations 01104460 and 

01104475 (table 3). From July through October 2007, the 

amount of water released from the Cambridge Reservoir 

accounted for about 80–95 percent of the total inflow to the 

Stony Brook Reservoir. The increase in discharge from the 

Cambridge Reservoir during the summer months is common 

as base flow from the upper portion of the Stony Brook 

Reservoir Basin (above the confluence with Hobbs Brook) 

diminishes and additional water is needed to meet the water 

demand for the city of Cambridge. However, low total rainfall 

(table 4) during this period increased the typical duration of 

the elevated flow discharged from the Cambridge Reservoir. 

About 3 percent or less of the water from the Stony Brook 

Reservoir was released to the Charles River for this period. 

As a result of increases in precipitation, monthly mean 

discharge from the Cambridge Reservoir was reduced to less 

than 45 percent of the water entering Stony Brook Reservoir 

(fig. 2) from November 2007 through September 2008. Flow 

released to the Charles River also increased to between 2 and 

79 percent (fig. 2).

The volume of water released from the Stony Brook 

Reservoir to the Charles River during water year 2007 

and 2008 represents an annual surplus of about 107 and 

94 percent, respectively, of the total annual water demand by 

the city of Cambridge. During water years 1999–2006, this 

surplus has ranged from 29 to 155 percent if average demand 

is assumed to be 15 Mgal/d. 

Annual runoff is the total quantity of water that is 

discharged (runs off) from a drainage basin in a year. 

The annual runoff for water year 2007 for USGS stations 

01104415, 01104453, 01104455, and 01104475, which were 

unaffected by streamflow regulation, ranged from 0.91 to 

1.28 millions of gallons of water per day per square mile 

(Mgal/d/mi2

; table 3). However, the annual runoff for USGS 

station 01104433, another station unaffected by streamflow 

regulation, was 0.52 Mgal/d/mi2

 or about half the amount of 

the other stations (table 3). The low yield at USGS station 

01104433 is likely the result of storm flows diverted to a 

neighboring intermittent stream caused by a backwater 

condition from a drainage pipe upstream of the monitoring 

station that limits the rate of flow. As a result of increases in 

the annual precipitation total for water year 2008 compared to 

2007 (table 4), the annual runoff increased for USGS stations 

01104415, 01104455, and 01104475, ranging from 1.04 to 

1.50 Mgal/d/mi2

 (table 3).

Monthly reservoir contents for the Cambridge Reservoir 

varied from about 30 to 95 percent of capacity during water 

years 2007–08 (fig. 3). The reservoir storage was at the 

2007–08 minimum during the month of December 2007 and 

near the lowest level since water year 2002. The reservoir 

storage was near capacity in the spring of each water year, but 

was subsequently drawn down, particularly during the summer 

and fall of 2007, as additional water was needed to supplement 

the city of Cambridge water supply when the yield from the 

upper portion of the Stony Brook Reservoir Basin diminished. 

Monthly reservoir storage values for the Stony Brook 

Reservoir varied from about 47 to 91 percent of capacity 

during water years 2007–08 (fig. 3). Monthly reservoir storage 

for Fresh Pond Reservoir was maintained at greater than 

92 percent of capacity during both water years (fig. 3). 

Specific Conductance Data

Measurements of specific conductance for USGS stations 

in the Cambridge, Massachusetts drinking-water supply area 

are largely affected by the size of the stream and density of 

roads in each subbasin (Waldron and Bent, 2001). Monthly 

minimum and maximum specific-conductance values can 

vary substantially because of stormwater runoff, particularly 

in the small subbasins (table 5). Conversely, the monthly 

specific conductance variation for streamflow immediately 

downstream of the Cambridge and Stony Brook Reservoirs 

(table 5) is small because of the large volume of impounded 

water behind each reservoir.

Monthly mean specific-conductance values for USGS 

stations for water years 2007–08 were compared to available 

historical data (Smith, 2005, 2007; Socolow and others, 1999, 

2000, 2001, 2002, 2003, 2004; U.S. Geological Survey, 2009). 

In general, most monthly mean specific-conductance values 

for all USGS stations were below the median monthly value 

for prior data, and for water year 2007, often were below the 

minimum monthly value for prior data (figs. 4–10). Monthly 

mean specific-conductance values for USGS station 01104415 

for most of water year 2008 were within the interquartile 
10 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 3. Monthly mean discharge for U.S. Geological Survey stations in the drinking-water source area for Cambridge, Massachusetts, for water years 2007–08.—Continued [Units are in millions of gallons; --, no data; Mgal/d/mi2, millions of gallons of water per day per square mile] Month U.S. Geological Survey station name and number Cambridge Reservoir, unnamed tributary 2, near Lexington (01104415) Hobbs Brook below Cambridge Reservoir near Kendal Green (01104430) Hobbs Brook, unnamed tributary 1, near Kendal Green (01104433) Stony Brook, unnamed tributary 2, near Weston Station (01104453) Stony Brook, unnamed tributary 1, near Waltham (01104455) Stony Brook at Route 20 at Waltham (01104460) Stony Brook Reservoir, unnamed tributary 1, near Weston (01104475) Stony Brook Reservoir at dam near Waltham (01104480) 2007 October 0.37 7.7 0.18 1.3 0.39 17.3 0.37 1.9 November 1.1 4.8 0.28 3.2 0.77 32.4 1.1 21.5 December 0.54 10.5 0.11 2.4 0.43 31.3 0.76 16.4 January 0.52 10.2 0.12 2.4 0.50 30.5 0.85 17.5 Feburary 0.13 3.9 0.09 0.87 0.16 12.5 0.39 0.32 March 0.90 4.0 0.43 4.0 0.97 41.4 1.6 24.9 April 1.48 19.1 0.37 6.4 1.5 81.4 2.2 69.8 May 0.72 13.4 0.16 3.9 0.81 45.6 1.2 29.9 June 0.28 9.6 0.09 1.8 0.39 22.8 0.58 8.4 July 0.13 14.9 0.16 0.52 0.26 18.4 0.16 0.45 August 0.03 14.0 0.12 0.41 0.12 14.7 0.08 0.45 September 0.05 14.2 0.16 0.28 0.14 15.1 0.06 0.17 Annual statistics Mean monthly discharge 0.52 10.6 0.19 2.3 0.54 30.4 0.78 16.0 Runoff (Mgal/d/mi2

) 1.28 -- 0.52 1.03 1.12 1.38 0.91 --

10 percent exceeds 1.16 16.2 0.46 5.3 1.23 58.2 1.6 41.450 percent exceeds 0.27 10.3 0.12 1.8 0.28 22.6 0.60 8.490 percent exceeds 0.01 3.9 0.04 0.23 0.08 12.9 0.06 0.18

2008

October 0.06 11.3 -- -- 0.16 12.7 0.07 0.28November 0.13 4.1 -- -- 0.21 9.0 0.26 0.24December 0.24 4.3 -- -- 0.28 11.4 0.36 0.28January 0.57 0.69 -- -- 0.67 20.2 0.95 4.23Feburary 1.5 0.72 -- -- 1.7 63.1 2.4 51.7March 1.2 1.4 -- -- 1.2 53.1 2.0 41.6April 0.63 1.9 -- -- 0.75 27.5 1.12 11.7
Data for the Cambridge Drinking-Water Source Area 11

Table 3. Monthly mean discharge for U.S. Geological Survey stations in the drinking-water source area for Cambridge, Massachusetts, for water years 2007–08.—Continued[Units are in millions of gallons; --, no data; Mgal/d/mi2, millions of gallons of water per day per square mile]

Month

U.S. Geological Survey station name and number

Cambridge 

Reservoir, 

unnamed 

tributary 2, 

near Lexington 

(01104415)

Hobbs Brook 

below 

Cambridge 

Reservoir near 

Kendal Green 

(01104430)

Hobbs Brook, 

unnamed 

tributary 1, near 

Kendal Green 

(01104433)

Stony Brook, 

unnamed 

tributary 2, near 

Weston Station 

(01104453)

Stony Brook, 

unnamed 

tributary 1, 

near Waltham 

(01104455)

Stony Brook 

at Route 20 

at Waltham 

(01104460)

Stony Brook 

Reservoir, 

unnamed 

tributary 1, 

near Weston 

(01104475)

Stony Brook 

Reservoir 

at dam near 

Waltham 

(01104480)

2008—Continued

May 0.34 2.9 -- -- 0.47 19.7 0.70 7.9June 0.50 9.0 -- -- 0.48 20.0 0.42 6.0July 1.0 8.6 -- -- 1.2 32.8 0.87 16.6August 0.48 13.0 -- -- 0.48 30.6 0.63 16.1September 0.72 5.1 -- -- 0.78 27.5 0.83 14.5

Annual statistics

Mean monthly discharge 0.61 5.3 -- -- 0.69 27.1 0.89 14.1Runoff (Mgal/d/mi2) 1.50 -- -- -- 1.44 1.23 1.04 --10 percent exceeds 1.3 12.9 -- -- 1.6 56.2 2.0 40.750 percent exceeds 0.32 2.97 -- -- 0.39 18.1 0.64 0.3690 percent exceeds 0.03 0.71 -- -- 0.08 9.7 0.09 0.16
12 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Smith_fig 02

 Discharge from Hobbs Brook Basin

 Water surplus from Stony Brook Reservoir

EXPLANATION

0

10

20

30

40

50

60

70

80

90

100

Water years 2007−08

Water supply, in percent

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Figure 2. Discharge from the Cambridge Reservoir as a percentage of water entering the 

Stony Brook Reservoir, and discharge from the Stony Brook Reservoir to the Charles River as a 

percentage of total inflow to the Stony Brook Reservoir for water years 2007–08.

range (between the 25th and 75th percentile) of monthly 

specific conductance values for available data for the period 

from water year 1997 to water year 2007 (fig. 4), except for 

the month of December, which was greater than the prior 

maximum value; the month of January, which was between 

the 75th percentile and maximum value for prior data; and 

the months of July through September, which were less that 

the 25th percentile. The monthly mean specific-conductance 

values for streamflow for Hobbs Brook below the Cambridge 

Reservoir (USGS station 01104430) for December through 

February 2008 were greater than the prior maximum values; 

monthly mean specific-conductance values for March through 

July 2008 remained above the 75th percentile for prior data; 

and monthly mean specific-conductance values decreased to 

within the interquartile range for August and September, 2008 

(fig. 5). In part, the extreme specific conductance values were 

caused by the influx of high specific conductance water from 

the tributaries to the reservoir (for example, USGS station 

01104415) and the low volume of water in the reservoir at 

the onset of the winter (fig. 11). As a result of nearly 62 in. of 

rainfall in the Cambridge Reservoir watershed during water 

year 2008 (table 4), the monthly mean specific-conductance 

values in streamflow below Cambridge Reservoir decreased 

to more typical levels (about 700 μs/cm) by the end of the 

water year (fig. 5). Most monthly mean specific-conductance 

values for USGS station 01104455 for water year 2008 were 

within the interquartile range of the monthly mean specificconductance values for the prior water years, except for the 

values for December 2007, and May, June, and August 2008, 

which were greater than the 75th percentile value for prior 

data, and February 2008, which was below the 25th percentile 

value (fig. 7). Monthly mean specific-conductance values for 

the first four months of water year 2008 for USGS station 

01104460 were greater that the 75th percentile value for prior 

data (fig. 8). During this period, streamflow consisted largely 

of high specific conductance water from the Cambridge 
Data for the Cambridge Drinking-Water Source Area 13

Table 4. Monthly and annual totals for precipitation for U.S. Geological Survey stations in the drinking-water source area 

for Cambridge, Massachusetts, for water years 2007–08.

[Units are in inches]

Month of year

Hobbs Brook below Cambridge 

Reservoir near Kendal Green 

(01104430)

Stony Brook Reservoir 

at dam near Waltham 

(01104480)

Fresh Pond gate house 

at Cambridge 

(422302071083801)

2007

October 5.45 5.51 4.69

November 6.75 6.58 6.32

December 2.38 2.13 1.76

January 2.72 2.69 2.28

Feburary 2.32 2.17 2.08

March 5.25 5.56 4.14

April 7.61 7.89 7.43

May 4.65 4.72 3.55

June 2.56 2.94 1.98

July 4.89 4.48 2.48

August 0.69 0.97 0.71

September 1.62 1.96 1.67

Annual totals 46.89 47.60 39.09

2008

October 2.85 3.26 2.71

November 3.54 3.45 2.73

December 5.39 4.86 3.85

January 2.88 2.69 2.5

Feburary 8.94 8.73 7.79

March 5.37 5.16 5.03

April 4.54 4.98 3.98

May 2.39 2.22 2.33

June 5.37 5.14 4.19

July 9.21 9.05 6.49

August 3.32 3.30 4.33

September 7.98 9.41 8.49

Annual totals 61.78 62.25 54.42

Reservoir (USGS station 01104430). For the remainder of 

water year 2008, most monthly mean specific-conductance 

values for USGS station 01104460 were less than the median 

monthly mean specific-conductance values for the prior water 

years (fig. 8). 

Nearly all specific conductance values for USGS 

station 01104475 for water year 2008 were greater than the 

median value for 2004–07 data (fig. 9). The streamflow for 

this station has the lowest specific conductance of all USGS 

stations in the drinking-water supply area. Monthly mean 

specific-conductance values for this station ranged from 181 

to 410 μs/cm for water years 2004–08. 

Most monthly mean specific-conductance values for 

the Fresh Pond Reservoir (USGS station 422302071083801) 

for water year 2008 were less than the median monthly 

mean specific-conductance values for the prior water years 

(2005–07), except for the values for October 2007, and 

February, March, and September 2008, which were greater 

than the prior median values (fig. 10). Monthly mean 

specific-conductance values for this station ranged from 422 

to 733 μs/cm for water years 2005–08. Annual peaks for 

monthly mean specific-conductance values for the Fresh Pond 

Reservoir that occur during late summer and fall (fig. 10) are 

due to a shift in water source. During most of the year, Fresh 
14 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Smith_fig 03

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Water years 2007−08

 Station 01104430 Cambridge Reservoir

 Station 01104480 Stony Brook Reservoir

 Station 422302071083801 Fresh Pond Reservoir

EXPLANATION

0

10

20

30

40

50

60

70

80

90

100

Mean reservoir storage, in percent

Figure 3. GMonthly mean reservoir storage as a percentage of capacity for water years 

2007–08 for the Cambridge Reservoir, Stony Brook Reservoir, and the Fresh Pond Reservoir.

Pond Reservoir receives a mixture of water from sources with 

dissimilar specific conductances, namely, Hobbs Brook Basin 

and Stony Brook Reservoir Basin. However, as the water yield 

from the Stony Brook Reservoir Basin diminishes during 

the late summer and fall, the Cambridge Reservoir becomes 

the primary source of water for the Fresh Pond Reservoir. 

Similar trends in monthly mean specific-conductance values 

for Stony Brook (USGS station 01104460; fig. 8) often 

are recorded during the same months. The annual mean 

specific-conductance values for Fresh Pond Reservoir during 

water years 2007–08 were 483 and 497 μS/cm, respectively 

(table 5), which were lower than the annual mean specificconductance range (514–553 μS/cm; Smith, 2005, 2007, 2008) 

for the prior three water years (2004–06). 

Many of the small tributaries to the reservoirs differ from 

the primary streams in that both the quantity and quality of 

water in the tributaries respond more rapidly to stormwater 

runoff. The daily mean specific-conductance values for USGS 

stations 01104415, 01104433, and 01104455 differed by as 

much as 3 orders of magnitude from the annual mean values 

during water years 2007–08 (table 5). Daily mean specific 

conductance values for USGS station 01104475 had the 

smallest range between the minimum and maximum daily 

value, differing by about 1,300 and 1,900 μS/cm, or about 530 

and 595 percent of the mean annual value during water years 

2007 and 2008, respectively. Daily mean specific conductance 

values for USGS station 01104455 had the greatest range, 

differing by about 34,300 and 98,500 μS/cm, or about 

3,150 and 6,480 percent, of the mean annual value during 

water years 2007 and 2008, respectively. The coefficient of 

variation (COV; the standard deviation divided by the mean) 

for monthly mean specific-conductance values for water 

year 2007 ranged from about 15 percent to about 38 percent 

(01104455>01104433>01104415>01104475). The COV 
Data for the Cambridge Drinking-Water Source Area 15

Table 5. Monthly and annual statistics for daily mean specific conductance for U.S. Geological Survey stations in the drinking-water source area for Cambridge, Massachusetts, for water years 2007–08.[Units are in microsiemens per centimeter; E, estimated from less than a full month or year of values; Min, minimum; Max, maximum; --, no data]

Month of year

U.S. Geological Survey station name and number

Cambridge Reservoir, 

unnamed tributary 2, near Lexington 

(01104415)

Hobbs Brook below Cambridge 

Reservoir near Kendal Green 

(01104430)

Hobbs Brook, 

unnamed tributary 1, near Kendal Green 

(01104433)

Stony Brook, 

unnamed tributary 1, near Waltham 

(01104455)

Max Min Mean Max Min Mean Max Min Mean Max Min Mean

2007

October 2,450 78 1,760 663 633 649 1,680 108 1,010 E1,180 E26 E990November 1,860 126 1,030 637 596 619 1,520 57 943 1,160 20 798December 1,950 158 1,220 601 582 589 1,600 184 1,230 2,200 18 898January 5,920 378 1,380 607 570 580 4,410 258 1,370 16,000 125 873Feburary 7,430 1,610 2,640 790 290 597 E4,740 E672 E2,450 E34,300 E804 E2,370March 16,500 349 1,410 645 592 630 5,040 415 1,520 29,500 231 1,160April 3,810 234 1,170 640 618 629 2,330 222 1,360 E8,580 106 E929May 1,900 241 1,340 643 623 634 1,910 204 1,390 1,340 64 944June 2,460 187 1,790 640 615 633 1,900 121 1,460 E1,260 E33 E1,090July 2,790 118 1,830 637 605 630 1,910 177 1,220 1,230 31 1,030August 2,630 546 1,820 624 554 598 1,830 509 1,360 1,500 40 1,040September E1,920 E213 E1,640 644 598 618 1,900 146 1,510 2,670 26 997Annual statistics 16,500 78 E1,590 790 290 617 5,040 57 E1,402 E34,300 18 E1,090

2008

October E1,980 E172 E1,570 658 630 648 -- -- -- E1,030 E21 E940November 2,350 135 1,750 E657 E633 E641 -- -- -- 996 30 885December 18,300 1,990 4,260 E1450 E639 E829 -- -- -- 98,500 425 4,480January 14,200 505 2,610 1,780 1,430 1,670 -- -- -- 20,000 227 1,770Feburary E13,500 E311 E1,930 1,680 1,450 1,580 -- -- -- 21,000 85 1,680March 20,000 328 1,680 1,470 796 1,060 -- -- -- 36,000 106 1,530April 2,240 351 1,420 830 795 808 -- -- -- 1,680 53 1,130May 2,890 244 1,750 835 791 817 -- -- -- 1,470 75 1,210June 3,010 93 1,870 848 815 836 -- -- -- 1,930 27 1,230July 3,460 104 1,710 845 784 818 -- -- -- 1,420 30 1,120August 2,480 177 1,640 808 667 705 -- -- -- 1,390 36 1,180September E2550 E74 E1,550 719 683 702 -- -- -- 1,880 19 1,090Annual statistics 20,000 E74 E1,980 1,780 630 964 -- -- -- 98,500 19 E1,520
16 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 5. Monthly and annual statistics for daily mean specific conductance for U.S. Geological Survey stations in the drinking-water source area for Cambridge,—Continued Massachusetts, for water years 2007–08.—Continued [Units are in microsiemens per centimeter; E, estimated from less than a full month or year of values; Min, minimum; Max, maximum; --, no data] Month of year Stony Brook at Route 20 at Waltham (01104460) Stony Brook Reservoir, unnamed tributary number 1, near Weston (01104475) Stony Brook Reservoir at dam near Waltham (01104480) Fresh Pond gate house at Cambridge (422302071083801) Max Min Mean Max Min Mean Max Min Mean Max Min Mean 2007 October 620 285 513 1,390 71 241 -- -- -- 539 476 503 November 467 244 345 241 76 181 -- -- -- 534 467 500 December 436 271 399 258 168 234 -- -- -- 529 448 480 January 483 313 384 420 191 250 -- -- -- 487 436 460 Feburary 976 365 445 E652 E242 E290 -- -- -- 489 460 476 March 1,990 292 498 E263 E156 E225 -- -- -- E626 E460 E478 April 553 268 357 264 156 238 -- -- -- 464 426 443 May 448 293 392 269 123 209 -- -- -- E444 E420 E429 June 594 253 466 325 82 250 -- -- -- 467 422 434 July 629 320 574 421 67 280 -- -- -- 505 440 472 August 648 321 609 332 105 292 -- -- -- 610 458 539 September 674 433 631 383 86 306 -- -- -- E605 E481 E581 Annual statistics 1,990 244 468 1,390 67 E250 -- -- -- E626 E420 E483 2008 October 675 430 644 2,020 103 335 -- -- -- 612 577 594 November 647 399 511 331 128 288 -- -- -- 590 419 479 December 3,670 464 708 754 256 347 -- -- -- 458 404 423 January 1,220 451 633 719 290 410 -- -- -- 505 434 471 Feburary 1,890 287 427 1,880 228 354 -- -- -- 551 500 527 March 2,010 283 403 513 231 338 -- -- -- 564 508 541 April 486 305 404 344 251 323 -- -- -- 527 441 475 May 530 299 437 366 281 319 -- -- -- E446 E393 E422 June 717 184 528 413 129 340 699 507 582 480 396 432 July 712 192 459 407 79 298 753 337 551 511 426 451 August 664 315 505 434 E136 E288 E599 E387 E493 667 402 542

September 686 201 436 366 92 279 651 366 516 649 441 606Annual statistics 3,670 184 509 2,020 79 E326 -- -- -- 667 E393 E497
Data for the Cambridge Drinking-Water Source Area 17

Smith_fig 04

Specific conductance prior to date shown for water years 1998, and 2004−07

Monthly mean specific conductance for water years 2007−08

EXPLANATION

400

600

800

1,000

1,200

1,400

1,600

1,800

2,000

2,200

2,400

2,600

2,800

3,000

3,200

3,400

3,600

3,800

4,000

4,200

4,400

Specific conductance, in microsiemens per centimeter 

Maximum

Minimum

Median

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

75th percentile

25th percentile

Water years 2007−08

Figure 4. Comparison of specific conductance for water years 2007–08 to prior specific 

conductance data for U.S. Geological Survey station 01104415, Cambridge Reservoir, 

unnamed tributary number 2, near Lexington, Massachusetts.
18 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Smith_fig 05

Specific conductance prior to date shown for water years 1998−07

Monthly mean specific conductance for water years 2007−08

EXPLANATION

300

400

500

600

700

800

900

1,000

1,100

1,200

1,300

1,400

1,500

1,600

1,700

Specific conductance, in microsiemens per centimeter 

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Water years 2007−08

Maximum

Minimum

Median

75th percentile

25th percentile

Figure 5. Comparison of specific conductance for water years 2007–08 for U.S. Geological 

Survey station 01104430, Hobbs Brook below Cambridge Reservoir near Kendal Green, 

Massachusetts.
Data for the Cambridge Drinking-Water Source Area 19

Smith_fig 06

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Maximum

Minimum

Median

Specific conductance prior to date shown for water years 2004−06

Monthly mean specific conductance for water years 2007

EXPLANATION

800

1,000

1,200

1,400

1,600

1,800

2,000

2,200

2,400

2,600

2,800

3,000

3,200

3,400

3,600

Specific conductance, in microsiemens per centimeter 

Water year 2007

Figure 6. Comparison of specific conductance for water year 2007 for U.S. Geological 

Survey station 01104433, Hobbs Brook unnamed tributary number 1, near Kendal Green, 

Massachusetts.
20 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Smith_fig 07

Specific conductance prior to date shown for water years 2001−07

Monthly mean specific conductance for water years 2007−08

EXPLANATION

500

1,000

1,500

2,000

2,500

3,000

3,500

4,000

4,500

5,000

5,500

6,000

6,500

7,000

7,500

8,000

8,500

Specific conductance, in microsiemens per centimeter

Maximum

Minimum

Median

75th percentile

25th percentile

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Water years 2007−08

Figure 7. Comparison of specific conductance for water years 2007–08 for U.S. 

Geological Survey station 01104455, Stony Brook, unnamed tributary number 1, near 

Waltham, Massachusetts.
Data for the Cambridge Drinking-Water Source Area 21

Specific conductance prior to date shown for water years 1998, and 2002−07

Monthly mean specific conductance for water years 2007−08

EXPLANATION

200

250

300

350

400

450

500

550

600

650

700

750

800

Specific conductance, in microsiemens per centimeter

Maximum

Minimum

Median

75th percentile

25th percentile

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Water years 2007−08

Figure 8. Comparison of specific conductance for water years 2007–08 for U.S. Geological 

Survey station 01104460, Stony Brook at Route 20 at Waltham, Massachusetts.
22 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Smith_fig 09

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Water years 2007−08

Maximum

Minimum

Median

Specific conductance prior to date shown for water years 2004−07

Monthly mean specific conductance for water years 2007−08

EXPLANATION

100

150

200

250

300

350

400

450

Specific conductance, in microsiemens per centimeter 

Figure 9. Comparison of specific conductance for water years 2007–08 for U.S. 

Geological Survey station 01104475, Stony Brook Reservoir, unnamed tributary number 1, 

near Weston, Massachusetts.
Data for the Cambridge Drinking-Water Source Area 23

Smith_fig 10

Specific conductance prior to date shown for water years 2005−07

Monthly mean specific conductance for water years 2007−08

EXPLANATION

400

450

500

550

600

650

700

750

Specific conductance, in microsiemens per centimeter 

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Water years 2007−08

Maximum

Minimum

Median

Figure 10. Comparison of specific conductance for water years 2007–08 for U.S. 

Geological Survey station 422302071083801, Fresh Pond in Gate House at Cambridge, 

Massachusetts.
24 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Smith_fig 11

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Water years 2007−08

 Monthly mean storage

EXPLANATION

20

30

40

50

60

70

80

90

100

 Monthly mean specific conductance

Mean reservoir storage, in percent

500

650

800

950

1,100

1,250

1,400

1,550

1,700

Specific conductance, in microsiemens per centimeter 

Figure 11. Monthly mean reservoir storage as a percentage of capacity and specific 

conductance for water years 2007–08 for U.S. Geological Survey station 01104430, Hobbs Brook 

below Cambridge Reservoir, near Kendal Green, Massachusetts.

for monthly mean specific-conductance values for water 

year 2008 ranged from about 11 percent to about 64 percent 

(01104455>01104415>01104475).

Water-Quality Data

The physical properties and chemical concentrations 

for water samples were compared to the U.S. Environmental 

Protection Agency (USEPA; U.S. Environmental Protection 

Agency, 2007) secondary drinking-water standards, where 

available, and the Massachusetts drinking-water guideline 

for sodium (Commonwealth of Massachusetts, Executive 

Office of Energy and Environmental Affairs, Department of 

Environmental Protection, Office of Research and Standards, 

2009). Secondary drinking-water regulations are nonmandatory water-quality standards established by the USEPA. 

They are guidelines designed to assist public water suppliers 

in managing their drinking water for aesthetic considerations, 

such as taste, odor, color, foaming, corrosivity, staining, 

scaling, and sedimentation. These constituents do not present 

a risk to human health at the secondary maximum contaminant 

level (U.S. Environmental Protection Agency, 2007). Although 

these standards are typically applied to finished water, the 

presence of these constituents in concentrations that exceed 

the respective standards can damage water equipment or 

reduce the effectiveness of treatment for other contaminants. 

Some constituents, such as chloride, sodium, and nitrogen, 

cannot be effectively removed or reduced by the Cambridge 

water-treatment facility (Smith, 2007).

In 3 of 81 water samples, measurements of pH were less 

than the USEPA secondary drinking-water standard of 6.5 pH 

units. These measurements (each 6.4 pH units) were made 

in one water sample collected at USGS station 01104420 

during base-flow conditions and in two composite samples 

of stormwater collected at USGS station 01104455 (table 6, 

at end of report). Concentrations of dissolved chloride in all 

water samples collected during base-flow conditions from 

USGS stations 01104410, 01104415, 01104420, 01104433, 
Data for the Cambridge Drinking-Water Source Area 25

and 01104455 were near or exceeded the USEPA secondary 

drinking-water standard of 250 mg/L (milligrams per liter). 

The 504-mg/L chloride concentration measured in a water 

sample collected from the USGS station below the Cambridge 

Reservoir (01104430) on January 31, 2008, was the highest 

concentration measured at that station by the USGS between 

water years 1997–2008 (Smith, 2008). All samples collected 

during base-flow conditions at USGS stations 01104415 and 

01104433, and five of six samples collected at USGS station 

01104455 exceeded the secondary drinking-water standard for 

chloride (table 6). The concentration of chloride in stormwater 

also exceeded the standard in two of six composite samples 

at USGS station 01104415, in two of nine composite samples 

of at USGS 01104455, and for a single composite sample 

collected at USGS station 01104433 (table 6). Concentrations 

of dissolved sulfate in all water samples were below the 

USEPA secondary drinking-water standard of 250 mg/L. 

Concentrations of dissolved sodium for all samples collected 

in the drinking-water source area exceeded the Massachusetts 

drinking water guideline of 20 mg/L, with the exception of 

three composites samples of stormwater collected at USGS 

stations 01104455 and 01104475 (table 6).

Concentrations of dissolved calcium, sodium, chloride, 

and sulfate in water samples collected in the drinking-water 

source area (excluding Fresh Pond Reservoir) ranged from 

2.99 to 75.8 mg/L, 7.47 to 534 mg/L, 11.4 to 1,050 mg/L, 

and 2.85 to 47.2 mg/L, respectively (table 6). With a few 

exceptions, the concentrations of these constituents in water 

samples collected during storms from the tributaries were 

generally lower than the concentrations observed in water 

samples collected during base-flow conditions at the primary 

sampling stations. The highest concentrations of dissolved 

sodium (534 mg/L), chloride (1,050 mg/L), and sulfate 

(47.2 mg/L) were found in a water sample collected on March 

2, 2007, during a winter storm at USGS station 01104415. The 

highest concentration of dissolved calcium (75.8 mg/L) was 

measured in a water sample collected on April 11, 2007, at 

USGS station 01104433 during base-flow conditions. 

The concentration of total nitrogen in water samples 

for all subbasins ranged from 0.42 to 3.14 mg/L (table 6). 

Average total nitrogen concentrations in water samples for the 

tributaries at the primary sampling sites ranged from 1.67 to 

2.21 mg/L. For samples collected at USGS station 01104460, 

the average concentration of total nitrogen in water samples 

collected during base-flow conditions was similar (within 

0.05 mg/L) to the average concentration of total nitrogen in 

composite samples of stormwater; however, the difference 

between average concentrations of total nitrogen in samples 

of base flow and stormwater for the tributaries ranged from 

-0.57 to 0.53 mg/L. The highest concentration of total nitrogen 

(3.14 mg/L) was measured in a water sample collected on 

March 2, 2007, in a composite sample of stormwater at 

USGS station 01104415, and on September 25, 2007, in a 

sample of water collected during base-flow conditions at 

USGS station 01104475. The average concentration of total 

nitrogen for samples collected during base-flow conditions at 

all of the sampling locations in the drinking-water source area 

(fig. 1) ranged from 0.50 mg/L at USGS station 01104410 to 

2.07 mg/L at USGS station 01104475 (01104410<01104430<0

1104405<01104460<01104420<01104390<01104453<011044

15<01104433<01104455<01104475).

The concentration of total phosphorus in water samples 

for all subbasins ranged from 0.006 to 0.53 mg/L (table 6). 

Average phosphorus concentrations in water samples for the 

tributaries at the primary sampling sites ranged from 0.087 to 

0.125 mg/L. For samples collected at USGS station 01104460, 

the average concentration of total phosphorus in water samples 

collected during base-flow conditions was similar (within 

0.034 mg/L) to the average concentration of phosphorus in 

composite samples of stormwater at USGS station 01104460; 

however, the difference between average concentrations of 

total phosphorus in samples of base flow and stormwater 

for the tributaries ranged from about 0.10 to 0.23 mg/L. The 

highest concentration of total phosphorus (0.53 mg/L) was 

measured in a composite sample of water collected during a 

storm on March 2, 2007, at USGS station 01104415 (table 6). 

The average concentration of total phosphorus for samples 

collected during base-flow conditions at all of the sampling 

locations (fig. 1) in the drinking-water source area ranged 

from 0.008 mg/L at USGS station 01104455 to 0.041 mg/L at 

USGS station 01104433 (01104455<01104415<01104430<01

104475<01104410<01104460<01104390<01104453<0110442

0<01104405<01104433).

Eighteen pesticides and caffeine were detected in 

water samples (table 6) collected in the primary streams and 

tributaries to the Cambridge Reservoir and Stony Brook 

Reservoir, and in raw water collected from the Cambridge 

water-treatment facility intake from the Fresh Pond Reservoir 

in water years 2007–08. Most of these pesticides are found 

in over-the-counter products used for turf management and 

the treatment of ornamental shrubs (table 7). Caffeine was 

detected in 54 percent of 80 water samples at concentrations 

ranging from 0.004 to 0.557 μg/L (micrograms per liter). 

Caffeine was detected in water samples collected at all 

USGS sampling stations except for 01104390, 01104410, 

and 01104453. Imidacloprid, siduron, and norflurazon were 

the most frequently detected pesticides (table 8) in samples 

of water collected in the drinking-water source area, with the 

number of detections ranging from about 29 to 32 percent. 

Caffeine and 2,4-D were more frequently detected in water 

samples collected during storms than in water samples 

collected during base-flow conditions (table 8). Imidacloprid, 

siduron, and 2,4-D were the only widespread pesticides 

detected in water samples collected at primary sampling 

stations (fig. 1 and table 8). The herbicide norflurazon was 

detected in nearly all water samples collected at USGS station 

01104455. The herbicide siduron; the insecticides carbaryl 

and imidacloprid; and the fungicides benomyl, metalaxyl, and 

propiconazole were detected in water samples collected under 

base-flow and stormflow conditions at USGS station 01104475 

at a frequency equal to or greater than 50 percent (table 8). 
26 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Table 7. Characteristics of selected pesticides detected in samples of base-flow and stormflow collected in the Hobbs Brook and 

Stony Brook Reservoir Basins, Massachusetts, water years 2007–08.—Continued

[CAS, Chemical Abstracts Service]

Pesticide target 

analyte Trade or common name(s)

Type 

of 

pesticide

1

CAS 

registry 

number

Use References

2,4-D “Agent White,” Bladex-B, 

Brush Killer 64, Dicofur, 

Dormon, Ipaner, Moxon, 

Netagrone, Pielik, Verton 

38, Mota Maskros, 

Silvaprop 1, Agricorn D, 

Acme LV4, Croprider, 

Fernesta, Lawn-Keep, 

Pennamine D, Plantgard, 

Tributon, Weed-B-Gon, 

Weedatul, Agroxone, 

Weedar, Salvo, Green Cross 

Weed-No-More 80, Red 

Devil Dry Weed Killer, 

Scott’s 4XD, Weed-Rhap 

LV40, Weedone 100, 

2,4-Dichloro-phenoxyacetic 

acid, Weedon-2,4,-DP

Herbicide 94–74–7 Used for the control 

of broadleaf weeds 

in agriculture, 

and for control of 

woody plants along 

roadsides, railways, 

and utilities rights 

of way.

U.S. Environmental 

Protection 

Agency (2006), 

Wagner and 

others (2006b)

2,4-D methyl ester Aqua Kleen, Weeone, and 

Emulsamine

Herbicide 1928–38–7 Used for the control 

of aquatic weeds, 

cropland and noncrop area weeds.

Wagner and others 

(2006b), Hornsby 

and others (1996)

2-Chloro-6-

ethylamino-4-

amino-s-triazine

Triazine degradation 

compound

Herbicide 

metabolite

94–75–7 Parent compound 

is used to control 

broadleaf and grassy 

weeds in crops and 

non-cropped areas.

Wagner and others 

(2006b)

Atrazine Aatrexx Herbicide 1912–24–9 Used to control 

broadleaf and grassy 

weeds in crops and 

non-crop areas.

Wagner and others 

(2006b)

Benomyl Agrocit, Benex, Benlate, 

Benosan, Fundazol, 

Fungidice 1991, and 

Tersan 1991

Fungicide 17804–

35–2

Used as a fungicide on 

vegatables, ornament 

shrubs, and turf.

U.S. Environmental 

Protection 

Agency (2001), 

Hornsby and 

others (1996), 

Extension 

Toxicology 

Network (1996)

Caffeine None Stimulant 58–08–2 Coffee, tea, cocoa, soft 

drinks, chocolate, 

prescription and 

over-the-counter 

drugs

Seiler and others 

(1999)
Data for the Cambridge Drinking-Water Source Area 27

Table 7. Characteristics of selected pesticides detected in samples of base-flow and stormflow collected in the Hobbs Brook and 

Stony Brook Reservoir Basins, Massachusetts, water years 2007–08.—Continued

[CAS, Chemical Abstracts Service]

Pesticide target 

analyte Trade or common name(s)

Type 

of 

pesticide

1

CAS 

registry 

number

Use References

Carbaryl

Dinoseb

Diuron

Fenuron

Imidacloprid

2-methyl-4-

chlorophenoxyacetic 

acid (MCPA)

Ortho Seven, Sevin

Basanite, Caldon, Chemox, 

Chemsect DNBP, Dinitro, 

Dynamyte, Elgetol, 

Gebutox, Hel- Fire, Kiloseb, 

Nitropone, Premerge, Sinox 

General, Subitex, and Vertac 

Weed Killer.

Aguton, DCMU, Di-on, Direx, 

Karmex, Topsite

Dybar, Beet-Kleen

Admire, Condifor, Gaucho, 

Premier, Premise, Provado, 

Marathon, Merit

Agritox, Agroxone, Border 

Master, Chiptox, Metaxon, 

Rhomene, Rhonox, WeedRhap, Weedone, Weedar

Insecticide

Herbicide

Herbicide

Herbicide

Insecticide

Herbicide

63–25–2

88–85–7

330–54–1

101–42–8 

138261–

41–3

94–74–6

Used as a broadspectrum insecticide 

in agriculture, 

professional turf 

management 

and ornamental 

production, and 

residential lawns 

and gardens.

Used in field crops 

for the selective 

control of grass and 

broadleaf weeds 

in corn; also used 

as an insecticide in 

grapes; and as a seed 

crop drying agent. 

Sale discontinued in 

1986.

Used for the control of 

weeds and mosses 

on turf and on 

many crops.

Used on leeks, fruits, 

and nursery trees.

Used for the control 

of sucking insects, 

including aphids, 

termites, and turf 

insects in crops 

and turf.

Used for selective 

control of broadleaf 

weeds on turf, 

lawns, vines, and 

rights-of-way, and in 

forestry applications.

U.S. Environmental 

Protection 

Agency (2004a), 

Hornsby and 

others (1996)

Wagner and others 

(2006b), Hornsby 

and others 

(1996), Extension 

Toxicology 

Network (1993a)

Wagner and others 

(2006b), Hornsby 

and others 

(1996), Extension 

Toxicology 

Network (1993b)

Wagner and others 

(2006b), Hornsby 

and others (1996)

Wagner and 

others (2006b), 

Extension 

Toxicology 

Network (2005)

Wagner and others 

(2006b), U.S. 

Environmental 

Protection 

Agency (2004b), 

Hornsby and 

others (1996), 

Extension 

Toxicology 

Network (1993c) 
28 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Table 7. Characteristics of selected pesticides detected in samples of base-flow and stormflow collected in the Hobbs Brook and 

Stony Brook Reservoir Basins, Massachusetts, water years 2007–08.—Continued

[CAS, Chemical Abstracts Service]

Pesticide target 

analyte Trade or common name(s)

Type 

of 

pesticide

1

CAS 

registry 

number

Use References

Metalaxyl

Norflurazon

Propiconazole

Propoxur

Siduron

Sulfometuron-methyl

Tebuthiuron

Ridomil, Apron, Delta-Coat 

AD, Subdue 2E

Zorial, Solicam, Evital

Alamo, Banner, Benit, Break, 

Bumper, Desmel, Fidis, 

Juno, Mantis, Maxx, Novel, 

Practis, Orbit, Radar, 

Restore, Spire, Taspa, Tilt, 

Wocosin

Arprocarb, Bay 9010, Bayer 

39007, Baygon, Bifex, 

Blattanex, Bolfo, Invisigard, 

Mobay, PHC, Propogon, 

Propyon, Rhoden, Sendra, 

Sendran, Suncide, Tendex, 

UNDEN, Undene

Tupersan, Trey

Oust Weed Killer and 

DPX 5648

Spike, Brush Bullet, EL-103, 

Graslan, Perflan, Herbec, 

Herbic and Reclaim. 

Fungicide

Herbicide

Fungicide

Insecticide

Herbicide

Herbicide

Herbicide

57837–

19–1

27314–

13–2

60207–

90–1

114–26–1

1982–49–6

74222–

97–2

34014–

18–1

Controls plant diseases 

caused by watermold fungi. Used 

on crops, ornament 

shrubs and trees, 

and turf.

Used for the control 

of germinating 

annual grasses and 

broadleaf weeds 

in agricultural, 

nonagricultural, and 

industrial areas.

Used on grasses grown 

for seed, many 

crops, conifors, 

hardwoods, and 

fruit trees.

Used to control insects 

in lawns, turf, 

and buildings.

Preemergence 

treatment for turf.

Used to control annual 

and perennial 

grasses and broadleaved weeds in noncrop areas; also used 

to control woody 

tree species.

Used for the control of 

weeds in non-crop 

areas, rangelands, 

rights-of-way and 

industrial sites.

Wagner and others 

(2006b), Hornsby 

and others 

(1996), U.S. 

Environmental 

Protection 

Agency (1994), 

Extension 

Toxicology 

Network (1993d) 

Wagner and others 

(2006b), U.S. 

Environmental 

Protection 

Agency (1996), 

Hornsby and 

others (1996)

Wagner and 

others (2006b), 

Extension 

Toxicology 

Network (1997), 

Hornsby and 

others (1996)

Wagner and others 

(2006b), Hornsby 

and others 

(1996), Extension 

Toxicology 

Network (1993e)

Wagner and others 

(2006b), Hornsby 

and others (1996)

Wagner and others 

(2006b), Hornsby 

and others 

(1996), Extension 

Toxicology 

Network (1994)

Wagner and others 

(2006b), Hornsby 

and others 

(1996), Extension 

Toxicology 

Network (1993f)

1

 This report contains CAS Registry Numbers®, which is a Registered Trademark of the American Chemical Society. CAS recommends the verification of 

the CASRNs through CAS Client ServicesSM.
Data for the Cambridge Drinking-Water Source Area 29

Table 8. Frequency of detection and maximum concentration of selected pesticides and caffeine in six samples of base-flow and six samples of stormflow collected in the Hobbs Brook and Stony Brook Basins and in four samples of raw-water collected from the intake of the water-treatment facility at Fresh Pond, Massachusetts, during water years 2007–08.[E, the recovery or variation in recovery of the analyte was outside the laboratory control range or concentration reported is less than laboratory reporting level and is qualified as estimated; shaded areas indicate where the maxiumun concentration was measured]

Target analyte

U.S. Geological Survey station number or name and sample type Fresh pond 

raw-water 

intake 

(percent)

Maximum 

concentration 

(micrograms 

per liter)

01104415 01104433 01104455 01104460 01104475

Base flow 

(percent)

Stormflow 

(percent)

Base flow 

(percent)

Stormflow 

(percent)

Base flow 

(percent)

1Stormflow 

(percent)

Base flow 

(percent)

Stormflow 

(percent)

2Base flow 

(percent)

Stormflow 

(percent)

2,4-D methyl ester 0 0 17 0 0 0 0 0 0 0 0 E0.041

2,4-D 0 50 0 67 0 33 0 17 0 33 0 E0.7402-Chloro-6-ethylamino4-amino-s-triazine 0 0 0 0 67 11 0 0 0 0 0 E0.01Atrazine 0 0 0 17 50 11 50 0 14 0 0 E0.017Benomyl 0 0 0 50 0 0 0 0 71 50 0 E0.017Caffeine 50 83 67 100 0 100 17 100 0 83 25 0.557Carbaryl 0 33 0 0 0 0 0 0 71 50 50 0.056Dinoseb 0 0 0 0 0 0 0 0 0 0 25 E.017Diuron 67 0 67 0 50 0 33 50 0 0 0 E0.027Fenuron 0 0 0 0 0 11 0 0 0 0 0 E0.036Imidacloprid 0 33 17 33 33 0 17 0 100 83 0 1.212-methyl-4-

chlorophenoxyacetic acid (MCPA)

0 15 0 0 0 11 0 0 0 0 0 E0.015

Metalaxyl 0 0 0 0 0 0 0 0 71 50 0 E0.028Norflurazon 0 0 0 0 100 78 33 67 0 0 50 0.165Propoxur 0 0 0 0 0 0 0 0 14 0 0 E0.001Propiconazole 0 0 0 0 0 0 0 0 67 67 0 0.084Siduron 17 33 33 17 0 22 33 50 57 50 50 0.114Sulfometuron-methyl 0 0 0 0 50 0 0 0 0 0 0 E0.005Tebuthiuron 0 0 0 0 33 17 17 0 0 0 0 E0.01

1Percentage calculated from nine samples.2Percentage calculated from seven samples.
30 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Eleven pesticides and caffeine were detected in water 

samples collected at the secondary sampling stations 

during water years 2007–08 (table 6). The detections for 

most pesticides at the secondary sampling stations were 

limited to samples collected during May, 2007. Atrazine 

and imidacloprid were the only pesticides detected in water 

samples from the secondary sampling station on Stony Brook 

(USGS station 01104390). Atrazine, as well as siduron and 

caffeine, also were detected in a water sample collected 

at USGS station 01104405. The pesticides 2-chloro-6-

ethylamino-4-amino-s-triazine, diuron, norflurazon, and 

sulfometuron-methyl were detected in water samples 

collected at USGS station 01104410. The pesticides 2,4-D, 

imidacloprid, norflurazon, and siduron, and caffeine were 

detected in water samples collected at USGS station 

01104420. The pesticides diuron, norflurazon, and siduron, 

and caffeine were detected in water samples collected from 

Hobbs Brook below the Cambridge Reservoir (USGS station 

01104430). With the exception of 2-chloro-6-ethylamino4-amino-s-triazine, norflurazon, and sulfometuron-methyl, 

all of the previous pesticides (2,4-D, atrazine, carbaryl, 

diuron, imidacloprid, metalazyl, and siduron) were measured 

in water samples collected from USGS station 01104453. 

Trace amounts of caffeine, carbaryl, dinoseb, norflurazon, 

and siduron were also detected in water from the Fresh Pond 

Reservoir (table 4; USGS station 422302071083802).

Quality-Control Samples

Trace amounts of calcium, sodium, and chloride were 

detected in field blanks (table 9, at end of report). The 

maximum concentration for these constituents measured in 

field blanks was one or more orders of magnitude less than the 

lowest concentration found in all environmental samples, and 

was within the precision of the laboratory methods (Fishman 

and Friedman, 1989). No other constituents were detected in 

either blank.

Field and laboratory concurrent replicate sets were 

analyzed by comparing the relative percent differences 

(RPDs) of the results for each pair of samples where the same 

analyte was detected in both samples. The maximum RPD for 

measurements of turbidity for replicate sets of water samples 

was less than about 62 percent, or 3.0 nephelometric turbidity 

ratio units (NTRUs). Measurements of pH for replicate 

sets were within 0.1 pH unit of each other. The maximum 

RPD for both field and laboratory measurements of specific 

conductance was less than about 3 percent. The RPDs for 

calcium, sodium, chloride, sulfate, total nitrogen, and total 

phosphorus were also precise and varied by no more than 

about 6 percent, except the RPD for total phosphorus in a 

single replicate set, which was about 29 percent. Large RPDs 

for total phosphorus between replicate sets of water samples 

resulted from small differences in samples with low-level 

concentrations (<0.01 mg/L). The median absolute RPD for 

total phosphorus was about 5 percent.

Replicate data are not available for many pesticides 

because they were not detected in the environmental samples. 

Only 2-Chloro-6-ethylamino-4-amino-s-triazine, atrazine, 

benomyl, caffeine, carbaryl, diuron, imidacloprid, metalaxyl, 

norflurazon, propiconazole, siduron, sulfometuron, and 

tebuthiuron were measured in one or more of the replicate 

samples. The RPDs for these compounds were less than 

about 13 percent, except for atrazine (67 percent), diuron 

(4–40 percent), and siduron (0–29 percent). Concentrations of 

diuron and siduron were measured in five of the nine replicate 

samples and were the most frequently detected pesticides.

Laboratory-preparation spiked samples provide a 

measure of method performance because they are processed 

and analyzed in the same manner as environmental samples. 

Laboratory-preparation spiked samples are prepared by 

adding known concentrations of target analytes to blank water. 

Field spike recoveries for organic compounds are compared 

to laboratory-preparation spike recoveries in table 10. 

During water year 2007, field spike recoveries for 27 out of 

59 constituents measured in a water sample collected at USGS 

station 01104455, and 11 out of 59 constituents measured 

in a water sample collected at USGS station 01104460 were 

outside of the lower and upper 99 percent confidence interval 

for analyte recoveries in laboratory-preparation spikes. The 

median RPD between the field spike and replicate field spike 

sample for USGS stations 01104455 and 01104460 was 

12 and 3 percent, respectively. These data indicate that the 

recoveries of the spiked concentrations in the water samples, 

although poor for many constituents, were relatively precise. 

For USGS stations 01104475 and 422302071083802 during 

water year 2008, aldicarb sulfone was the only constituent 

for which field spike recoveries were outside of the lower and 

upper 99 percent confidence interval for analyte recoveries in 

laboratory-preparation spikes.

Meteorological Data

Monthly precipitation totals for the Cambridge 

drinking-water source area ranged from 0.69 in. to more 

than 9 in. during water years 2007–08 (table 4). The COVs 

for monthly precipitation totals for water year 2007 were 

similar—55 and 54 percent—for USGS station 01104430 at 

Cambridge Reservoir and 01104480 at Stony Brook Reservoir, 

respectively. The COVs for monthly precipitation totals for 

USGS station 422302071083801 at Fresh Pond Reservoir 

was about 62 percent for water year 2007 and the annual 

precipitation total was about 8 in. lower than the totals for 

the gages at the Cambridge and Stony Brook Reservoirs. 

For water year 2008, the COVs for monthly precipitation 

totals for all three stations were similar, ranging from about 

45 to 49 percent. However, the annual precipitation total 

for the Fresh Pond Reservoir was about 8 in. lower than the 

total precipitation measured at the Cambridge and Stony 

Brook Reservoirs. 
Data for the Cambridge Drinking-Water Source Area 31

Table 10. Recovery statistics for organic compounds in laboratory-spiked preparation samples and recoveries for field-spiked samples for the Cambridge, Massachusetts, drinking water source area during water years 2007–08.—Continued[NWQL, National Water Quality Laboratory; USGS, U.S. Geological Survey; --, no data; NWQL preparation spike recoveries for inorganic compounds were obtained from the NWQL QC data system in 2010; shaded areas indicate value is outside of the lower and upper 99 percent confidence limit for NWQL preparation spike recoveries]

Analyte

NWQL preparation spike recoveries (percent), 

for water years 2007–08 Field spike recoveries (percent) by USGS station number

Median Upper 99 percent confidence limit Lower 99 percent confidence limit 01104455 01104460 01104475 422302071083802

2,4-D 86 133 39 100 124 85 882,4-D methyl ester 65 170 -79 0 42 -- --2,4-DB 81 116 47 39 59 62 632-Chloro-4-

isopropylamino-6-amino-s-triazine

84 132 33 0 16 42 41

2-Chloro-6-

ethylamino-4-amino-s-triazine

84 134 26 0 34 51 51

2-Hydroxy-4-

isopropylamino6-ethylamino-striazine

96 172 23 0 0 85 89

N-(4-Chlorophenyl)-

N’-methylurea

93 150 34 23 30 53 53

3-Hydroxy carbofuran 97 156 40 0 31 51 49Acifluorfen 61 107 16 25 57 31 37Aldicarb 64 143 -20 15 19 8 8Aldicarb sulfone 79 144 14 0 9 13 13Aldicarb sulfoxide 100 171 23 31 41 54 71Atrazine 95 152 39 26 47 62 61Bendiocarb 85 159 15 45 47 64 62Benomyl 111 192 37 76 73 43 44Bensulfuron-methyl 93 162 29 92 112 116 114Bentazon 76 134 19 61 84 86 89Bromacil 99 150 50 6 22 53 50
32 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 10. Recovery statistics for organic compounds in laboratory-spiked preparation samples and recoveries for field-spiked samples for the Cambridge, Massachusetts, drinking water source area during water years 2007–08.—Continued [NWQL, National Water Quality Laboratory; USGS, U.S. Geological Survey; --, no data; NWQL preparation spike recoveries for inorganic compounds were obtained from the NWQL QC data system in 2010; shaded areas indicate value is outside of the lower and upper 99 percent confidence limit for NWQL preparation spike recoveries] NWQL preparation spike recoveries (percent), Field spike recoveries (percent) by USGS station number for water years 2007–08 Analyte Upper 99 percent Lower 99 percent Median 01104455 01104460 01104475 422302071083802 confidence limit confidence limit Bromoxynil 63 125 4 40 48 75 74 Caffeine 89 146 29 33 38 61 61 Carbaryl 90 136 41 30 43 64 64 Carbofuran 92 141 42 55 60 78 77 Chloramben methyl 90 139 40 0 0 65 77 ester Chlorimuron-ethyl 83 198 -16 44 80 97 95 Clopyralid 68 123 2 0 0 -- -- Cycloate 70 108 33 33 64 64 62 Dacthal monoacid 83 119 43 0 84 80 75 Dicamba 74 116 31 0 45 -- -- Dichlorprop 83 120 47 86 101 90 90 Dinoseb 63 115 14 53 85 85 85 Diphenamid 94 137 52 58 76 86 83 Diuron 97 139 56 0 46 78 76 Fenuron 100 161 38 57 67 54 56 Flumetsulam 94 195 2 38 38 69 65 Fluometuron 97 138 53 41 64 75 74 Imazaquin 114 246 0 22 39 75 74 Imazethapyr 106 200 22 25 35 30 23 Imidacloprid 95 170 25 0 49 78 68 Linuron 91 126 54 37 59 81 78
Data for the Cambridge Drinking-Water Source Area 33

Table 10. Recovery statistics for organic compounds in laboratory-spiked preparation samples and recoveries for field-spiked samples for the Cambridge, Massachusetts, drinking water source area during water years 2007–08.—Continued[NWQL, National Water Quality Laboratory; USGS, U.S. Geological Survey; --, no data; NWQL preparation spike recoveries for inorganic compounds were obtained from the NWQL QC data system in 2010; shaded areas indicate value is outside of the lower and upper 99 percent confidence limit for NWQL preparation spike recoveries]

NWQL preparation spike recoveries (percent), Field spike recoveries (percent) by USGS station number for water years 2007–08 Analyte Upper 99 percent Lower 99 percent Median 01104455 01104460 01104475 422302071083802 confidence limit confidence limit

2-methyl-4- 81 119 41 83 86 88 88

chlorophenoxyacetic acid (MCPA)

4-(4-chloro-2- 65 107 19 31 46 54 53

methylphenoxy)butanoic acid (MCPB)

Metalaxyl 93 131 52 64 76 92 89

Methiocarb 88 134 43 42 57 75 72

Methomyl 96 153 32 54 60 73 68

Metsulfuron-methyl 68 180 -43 55 86 83 80

Neburon 87 122 51 38 79 69 72

Nicosulfuron 171 428 -60 80 126 214 202

Norflurazon 95 137 53 39 64 82 82

Oryzalin 81 116 47 0 74 83 80

Oxamyl 94 155 25 0 47 55 67

Picloram 72 155 -9 43 53 0 0

Propham 90 132 46 36 51 78 70

Propiconazole 83 126 41 36 75 74 73

Propoxur 96 146 44 50 62 80 76

Siduron 99 149 53 55 77 90 89

Sulfometuron-methyl 90 164 27 56 71 118 116Tebuthiuron 106 167 47 27 42 68 67

Terbacil 96 142 49 17 23 58 56

Triclopyr 82 123 37 55 77 80 87
34 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

In general, variability between monthly precipitation 

totals for all stations is attributed to differences in storm 

tracks, storm-intensity patterns, and storm wind intensity. 

Additionally, the variability between monthly precipitation 

totals during the winter months is compounded by the change 

from rainfall to snowfall because snow is less dense than rain 

and, therefore, is affected more strongly by wind. Totals are 

generally lower for the precipitation gage at USGS station 

422302071083801 because it does not contain a wind screen 

and is more susceptible to wind bias than the other gages 

(table 4). 

The annual precipitation total recorded at USGS station 

01104430 during water year 2007 (46.89 in.) was about 5 to 

21 percent lower than recorded totals for the previous four 

water years (Smith, 2005 and 2007; Socolow and others, 2003, 

2004). Monthly precipitation totals for this station during 

water year 2007 were generally within the minimum and 

maximum precipitation totals for water years 2002–06, except 

for the months of December, August, and September, which 

were lower (fig. 12). The annual precipitation total of 61.78 in. 

during water year 2008 was about 5 to 32 percent higher than 

recorded totals for water years 2002–07 (Smith, 2005, 2007; 

Socolow and others, 2003, 2004). Monthly precipitation totals 

during water year 2008 were generally equal to or greater 

than the median monthly precipitation total for water years 

2002–07, except for the months of October, November, May, 

and August, which were lower than the median monthly value 

(fig. 12). For the months of February, July, and September, the 

monthly precipitation totals were substantially greater than 

prior maximum precipitation totals.

Maximum

Minimum

Median

75th percentile

25th percentile

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Oct.

Nov.

Dec.

Jan.

Feb.

Mar.

Apr.

May

Jun.

Jul.

Aug.

Sept.

Water years 2007−08

Precipitation prior to date shown for water years 2002−07

Monthly precipitation for water years 2007−08

EXPLANATION

0

1

2

3

4

5

6

7

8

9

10

11

Precipitation, in inches

Figure 12. Monthly precipitation for water years 2007–08 for U.S. Geological Survey station 

01104430, Hobbs Brook below Cambridge Reservoir, near Kendal Green, Massachusetts.
References Cited 35

Mean monthly air-temperature values were similar 

between the Cambridge and Stony Brook Reservoirs, differing 

by no more than about 0.5°C (U.S. Geological Survey, 2009). 

Mean monthly air-temperature values varied most in January 

and September (U.S. Geological Survey, 2009). During 

water years 2007–08, mean monthly air-temperature values 

for USGS station 01104430 were within 3°C of the median 

values for water years 2002–06 and 2002–07, except for the 

December 2007, which was about 4°C greater than the median 

for water years 2002–06, and for February 2008, which was 

-3.1°C less than the median value for water years 2002–07 

(Smith, 2005, 2007; Socolow and others, 2002, 2003; U.S. 

Geological Survey, 2009). 

References Cited

American Public Health Association, 1998, Standard 

methods for the examination of water and wastewater 

(20th ed.): Washington, D.C., American Public Health 

Association, American Water Works Association, and Water 

Environment Federation, p. 3-37–3-43.

Bedient, P.B., and Huber, W.C., 2002, Hydrology and 

floodplain analysis (3d ed.): New Jersey, Prentice Hall, 

692 p.

Buchanan, T.J., and Somers, W.P., 1968, Stage measurements 

at gaging stations: U.S. Geological Survey Techniques of 

Water-Resources Investigations, book 3, chap. A7, 28 p.

Buchanan, T.J., and Somers, W.P., 1969, Discharge 

measurements at gaging stations: U.S. Geological Survey 

Techniques of Water-Resources Investigations, book 3, 

chap. A8, 65 p.

Carter, R.W., and Davidian, Jacob, 1968, General procedure 

for gaging streams: U.S. Geological Survey Techniques of 

Water-Resources Investigations, book 3, chap. A6, 13 p.

Commonwealth of Massachusetts, Executive Office of Energy 

and Environmental Affairs, Department of Environmental 

Protection, Office of Research and Standards, 2009, 

Standards and guidelines for contaminants in Massachusetts 

drinking waters: accessed February 16, 2010, at http:/www.

mass.gov/dep/water/dwstand.pdf.

Extension Toxicology Network, 1993a, Pesticide information 

profile for Dinoseb: accessed February 08, 2010, at 

http://pmep.cce.cornell.edu/profiles/extoxnet/dienochlorglyphosate/dinoseb-ext.html.

Extension Toxicology Network, 1993b, Pesticide information 

profile for diuron: accessed April 05, 2006, at http://pmep.

cce.cornell.edu/profiles/extoxnet/dienochlor-glyphosate/

diuron-ext.html.

Extension Toxicology Network, 1993c, Pesticide information 

profile for MCPA: accessed April 05, 2006, at http://

pmep.cce.cornell.edu/profiles/extoxnet/haloxyfopmethylparathion/mcpa-ext.html.

Extension Toxicology Network, 1993d, Pesticide information 

profile for metalaxyl: accessed April 05, 2006, at http://

pmep.cce.cornell.edu/profiles/extoxnet/haloxyfopmethylparathion/metalaxyl-ext.html. 

Extension Toxicology Network, 1993e, Pesticide information 

profile for propoxur: accessed April 05, 2006, at http://

pmep.cce.cornell.edu/profiles/extoxnet/metiram-propoxur/

propoxur-ext.html.

Extension Toxicology Network, 1993f, Pesticide information 

profile for Tebuthiuron: accessed February 08, 2010, at 

http://pmep.cce.cornell.edu/profiles/extoxnet/pyrethrinsziram/tebuthiuron-ext.html.

Extension Toxicology Network, 1994, Pesticide information 

profile for Sulfometuron-methyl: accessed February 08, 

2010, at http://pmep.cce.cornell.edu/profiles/extoxnet/

pyrethrins-ziram/sulfometuron-methyl-ext.html.

Extension Toxicology Network, 1996, Pesticide information 

profile for Benomyl: accessed February 08, 2010, at http://

extoxnet.orst.edu/pips/benomyl.htm.

Extension Toxicology Network, 1997, Pesticide information 

profile for propiconazole: accessed April 05, 2006, at http://

pmep.cce.cornell.edu/profiles/extoxnet/metiram-propoxur/

propiconazole-ext.html.

Extension Toxicology Network, 2005, Pesticide information 

profile for imidacloprid: accessed April 05, 2006, at 

http://pmep.cce.cornell.edu/profiles/extoxnet/haloxyfopmethylparathion/imidacloprid-ext.html.

Fishman, M.J., ed., 1993, Methods of analysis by the U.S. 

Geological Survey National Water Quality Laboratory—

Determination of inorganic and organic constituents in 

water and fluvial sediments: U.S. Geological Survey OpenFile Report 93–125, 217 p.

Fishman, M.J., and Friedman, L.C., 1989, Methods for 

determination of inorganic substances in water and fluvial 

sediments: U.S. Geological Survey Techniques of WaterResources Investigations, book 5, chap. A1, 545 p.

Furlong, E.T., Anderson, B.D., Werner, S.L., Soliven, P.P., 

Coffey, L.J., and Burkhardt, M.R., 2001, Methods of 

analysis by the U.S. Geological Survey National Water 

Quality Laboratory—Determination of pesticides in 

water by graphitized carbon-based solid-phase extraction 

and high-performance liquid chromatography/mass 

spectrometry: U.S. Geological Survey Water-Resources 

Investigations Report 01–4134, 73 p.
36 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Garbarino, J.R., Kanagy, L.K., and Cree, M.E., 2006, 

Determination of elements in natural-water, biota, sediment 

and soil samples using collision/reaction cell inductively 

coupled plasma-mass spectrometry: U.S. Geological 

Survey Techniques and Methods, book 5, sec. B, chap. 1, 

88 p.

Hornsby, A.G., Wauchope, R.D., and Herner, A.E., 1996, 

Pesticide properties in the environment: New York, 

Springer-Verlag, 227 p.

Kennedy, E.J., 1983, Computation of continuous records of 

streamflow: U.S. Geological Survey Techniques of WaterResources Investigations, book 3, chap. A13, 52 p.

Kennedy, E.J., 1984, Discharge ratings at gaging stations: 

U.S. Geological Survey Techniques of Water-Resources 

Investigations, book 3, chap. A10, 59 p.

Oberg, K.A., Morlock, S.E., and Caldwell, W.S., 2005, 

Quality-assurance plan for discharge measurements using 

acoustic Doppler current profilers: U.S. Geological Survey 

Scientific Investigations Report 2005–5183, 35 p.

Patterson, Glenn, 1997, The U.S. Geological Survey drinking 

water initiative: U.S. Geological Survey Fact Sheet 

047–97, 2 p.

Patton, C.J., and Kryskalla, J.R., 2003, Methods of analysis 

by the U.S. Geological Survey National Water Quality 

Laboratory—Evaluation of alkaline persulfate digestion 

as an alternative to kjeldahl digestion for determination of 

total and dissolved nitrogen and phosphorus in water: U.S. 

Geological Survey Water-Resources Investigations Report 

03–4174, 33 p.

Rantz, S.E., and others, 1982, Measurement and computation 

of streamflow—Volume 1. Measurement of stage and 

discharge: U.S. Geological Survey Water-Supply Paper 

2175, 284 p.

Seiler, R.L., Zaugg, S.D., Thomas, J.M., and Howcroft, D.L., 

1999, Caffeine and pharmaceuticals as indicators of waste 

water contamination in wells: Ground Water, v. 37 no. 3, p. 

405–410.

Smith, K.P., 2005, Hydrologic, water-quality, bed-sediment, 

soil-chemistry, and statistical summaries of data for the 

Cambridge, Massachusetts, drinking-water source area, 

water year 2004: U.S. Geological Survey Open-File Report 

2005–1383, 110 p.

Smith, K.P., 2007, Hydrologic, water-quality, and 

meteorological data for the Cambridge, Massachusetts, 

drinking-water source area, water year 2005: U.S. 

Geological Survey Open-File Report 2007–1049, 119 p.

Smith, K.P., 2008, Hydrologic, water-quality, and 

meteorological data for the Cambridge, Massachusetts, 

drinking-water source area, water year 2006: U.S. 

Geological Survey Open-File Report 2008–1175, 165 p.

Socolow, R.S., Comeau, L.Y., Zanca, J.L., and Ramsbey, L.R., 

1999, Water-resources data for Massachusetts and Rhode 

Island, water year 1998: U.S. Geological Survey WaterData Report MA–RI–98–1, 438 p. 

Socolow, R.S., Girouard, G.G., and Ramsbey, L.R., 2003, 

Water-resources data for Massachusetts and Rhode Island, 

water year 2002: U.S. Geological Survey Water-Data 

Report MA–RI–02–1, 339 p.

Socolow, R.S., Leighton, J.F., Whitley, J.F., and Ventetuolo, 

D.J., 2002, Water-resources data for Massachusetts and 

Rhode Island, water year 2001: U.S. Geological Survey 

Water-Data Report MA–RI–01–1, 307 p.

Socolow, R.S., Whitley, J.S., Murino, D., Jr., and Ramsbey, 

L.R., 2001, Water-resources data for Massachusetts and 

Rhode Island, water year 2000: U.S. Geological Survey 

Water-Data Report MA–RI–00–1, 459 p.

Socolow, R.S., Zanca, J.L., Driskell, T.R., and Ramsbey, L.R., 

2004, Water-resources data for Massachusetts and Rhode 

Island, water year 2003: U.S. Geological Survey WaterData Report MA–RI–03–1, 368 p.

Socolow, R.S., Zanca, J.L., Murino, D., Jr., and Ramsbey, 

L.R., 2000, Water-resources data for Massachusetts and 

Rhode Island, water year 1999: U.S. Geological Survey 

Water-Data Report MA–RI–99–1, 401 p.

U.S. Environmental Protection Agency, 1994, RED FACTS 

Metalaxyl: accessed April 05, 2006, at http://www.epa.gov/

oppsrrd1/REDs/factsheets/0081fact.pdf.

U.S. Environmental Protection Agency, 1996, RED FACTS 

Norflurazon: accessed April 05, 2006, at http://www.epa.

gov/oppsrrd1/REDs/factsheets/0229fact.pdf.

U.S. Environmental Protection Agency, 2001, Benomyl RED 

Facts: Benomyl fact sheet, EPA–738–F–02–001.

U.S. Environmental Protection Agency, 2004a, Carbaryl IRED 

facts: accessed April 05, 2006, at http://www.epa.gov/

oppsrrd1/REDs/factsheets/carbaryl_factsheet.pdf.

U.S. Environmental Protection Agency, 2004b, RED FACTS 

MCPA: accessed April 05, 2006, at http://www.epa.gov/

oppsrrd1/REDs/factsheets/mcpa_red_fs.pdf.

U.S. Environmental Protection Agency, 2006, Consumer fact 

sheet on 2,4-D: accessed April 05, 2006, at http://www.epa.

gov/safewater/contaminants/dw_contamfs/24-d.html.
References Cited 37

U.S. Environmental Protection Agency, 2007, List of national 

secondary drinking water regulations: accessed September 

24, 2007, at http://www.epa.gov/safewater/contaminants/

index.html#sec.

U.S. Geological Survey, 2009, Water-resources data for the 

United States, Water Year 2008: U.S. Geological Survey 

Water-Data Report WDR–US–2007, accessed April 1, 2008, 

and January 21, 2010, at http://wdr.water.usgs.gov/.

Wagner, R.J., Boulger, R.W., Jr., Oblinger, C.J., and Smith, 

B.A., 2006a, Guidelines and standard procedures for 

continuous water-quality monitors—Station operation, 

record computation, and data reporting: U.S. Geological 

Survey Techniques and Methods 1–D3, 51 p. + 8 

attachments, accessed April 10, 2006, at http://pubs.water.

usgs.gov/tm1d3.

Wagner, R.J., Frans, L.M., and Huffman, R.L., 2006b, 

Occurrence, distribution, and transport of pesticides in 

agricultural irrigation return flow from four drainage basins 

in the Columbia Basin Project, Washington, 2002–2004, 

and comparison with historical data: U.S. Geological 

Survey Scientific Investigations Report 2006–5005, 54 p.

Waldron, M.C., and Bent, G.C., 2001, Factors affecting 

reservoir and stream-water quality in the Cambridge, 

Massachusetts, drinking-water source area and implications 

for source-water protection: U.S. Geological Survey WaterResources Investigations Report 00–4262, 89 p.

Wilde, F.D., Radtke, D.B., Gibs, Jacob, and Iwatsubo, 

R.T., eds., September 1999, Collection of water samples: 

U.S. Geological Survey Techniques of Water-Resources 

Investigations, book 9, chap. A4, accessed November 2, 

2006, at http://pubs.water.usgs.gov/twri9A4/.
38 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms] USGS station number Sample type Begin date Begin time End date End time Discharge, instantaneous (millions of gallons per day) Turbidity (NTRU) Dissolved oxygen (milligrams per liter) pH, field (standard units) Specific conductance, laboratory (μS/cm) P50051 P63676 P00300 P00400 P90095 01104390 Base flow 12/11/2006 1030 -- -- 11 4.5 13.80 7.5 231 01104390 Base flow 05/15/2007 1030 -- -- 11 3.7 9.20 7.0 267 01104405 Base flow 12/11/2006 1110 -- -- 1.6 3.6 13.70 7.5 248 01104405 Base flow 05/15/2007 0920 -- -- 1.6 3.0 9.80 6.8 288 01104410 Base flow 12/11/2006 1125 -- -- 0.23 2.8 11.00 7.1 890 01104410 Base flow 05/15/2007 0830 -- -- 0.26 3.4 8.50 6.7 990 01104415 Stormflow 12/1/2006 1619 12/2/2006 0044 56 7 390 01104415 Base flow 12/12/2006 0800 0.07 1.4 12.3 7.1 1,550 01104415 Base flow 2/12/2007 1125 0.08 1.5 12.8 7 2,240 01104415 Stormflow 3/2/2007 0542 3/2/2007 1348 180 6.8 3,400 01104415 Base flow 4/11/2007 0710 0.50 2.3 11.3 7.1 1,490 01104415 Stormflow 4/27/2007 0511 4/28/2007 0824 6.4 7.3 788 01104415 Base flow 5/14/2007 1220 0.26 1.5 10.5 7 1,870 01104415 Stormflow 7/5/2007 0225 7/6/2007 1358 29 6.7 906 01104415 Base flow 7/16/2007 1130 0.006 2.5 6.6 7 2,470 01104415 Stormflow 8/6/2007 1612 8/6/2007 2015 8.5 7.4 2,300 01104415 Stormflow 9/11/2007 1258 9/12/2007 0258 33 6.7 356 01104415 Base flow 9/25/2007 1240 <0.01 1.7 5.9 7.1 1,980 01104420 Base flow 12/11/2006 1200 -- -- 0.64 2.6 10.10 7.2 889 01104420 Base flow 05/15/2007 0940 -- -- 0.43 3.8 4.50 6.4 1,070
Table 6 39

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Discharge, Dissolved pH, Specific 

USGS instantaneous Turbidity oxygen field conductance, Sample Begin Begin End End station (millions of (NTRU) (milligrams (standard laboratory type date time date time number gallons per day) per liter) units) (μS/cm)

P50051 P63676 P00300 P00400 P90095

01104430 Base flow 12/12/2006 0830 -- -- 12 1.8 13.60 7.7 61701104430 Base flow 05/15/2007 1010 -- -- 8.40 1.5 9.40 7.1 63001104430 Base flow 01/31/2008 1400 -- -- 0.65 -- -- 7.0 1,680

01104433 Stormflow 12/01/2006 1616 12/02/2006 1541 26 -- 7.2 624

01104433 Base flow 12/12/2006 1245 -- -- 0.09 4.5 10.10 7.1 1,610

01104433 Base flow 02/12/2007 1220 -- -- 0.04 4.8 9.30 7.3 1,850

01104433 Stormflow 03/02/2007 0645 03/03/2007 2318 -- 26 -- 6.6 998

01104433 Base flow 04/11/2007 0745 -- -- 0.14 4.6 9.50 7.0 1,980

01104433 Base flow 05/14/2007 1330 -- -- 0.10 2.2 13.20 7.3 1,690

01104433 Stormflow 05/16/2007 1536 05/17/2007 1217 -- 16 -- 7.1 518

01104433 Stormflow 07/04/2007 2226 07/05/2007 2104 -- 30 -- 6.8 593

01104433 Base flow 07/16/2007 1200 -- -- 0.05 6.9 5.70 7.2 1,820

01104433 Stormflow 08/06/2007 1103 08/07/2007 1055 -- 28 -- 7.2 786

01104433 Stormflow 09/11/2007 1128 09/12/2007 0315 -- 54 -- 6.9 436

01104433 Base flow 09/25/2007 1100 -- -- 0.13 8.6 6.00 6.8 1,810

01104453 Base flow 12/12/2006 1330 -- -- 2.1 2.9 12.90 7.4 438

01104453 Base flow 05/15/2007 1120 -- -- 1.9 4.3 8.90 7.0 520

01104455 Stormflow 12/01/2006 1617 12/02/2006 0939 -- 21 -- 7.0 342

01104455 Base flow 12/12/2006 1300 -- -- 0.31 0.4 9.80 6.9 96201104455 Stormflow 01/08/2007 0508 01/08/2007 2358 -- 17 -- 6.8 284
40 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms] Discharge, Dissolved pH, Specific USGS instantaneous Turbidity oxygen field conductance, Sample Begin Begin End End station (millions of (NTRU) (milligrams (standard laboratory type date time date time number gallons per day) per liter) units) (μS/cm) P50051 P63676 P00300 P00400 P90095 01104455 Base flow 02/12/2007 1240 -- -- 0.16 0.5 9.30 7.0 1,030 01104455 Stormflow 03/02/2007 0328 03/03/2007 2328 -- ` -- 6.8 1,130 01104455 Stormflow 03/11/2007 0214 03/11/2007 2122 -- 31 -- 7.1 988 01104455 Base flow 04/11/2007 0800 -- -- 0.63 1.1 10.20 6.8 1,000 01104455 Stormflow 04/27/2007 0454 04/27/2007 2246 -- 26 -- 6.9 383 01104455 Base flow 05/14/2007 1250 -- -- 0.30 1.0 9.60 7.0 1,180 01104455 Stormflow 05/16/2007 1532 05/16/2007 2230 -- 75 -- 6.5 159 01104455 Stormflow 07/04/2007 2236 07/05/2007 0823 -- 61 -- 6.4 162 01104455 Base flow 07/16/2007 1230 -- -- 0.09 0.4 9.90 7.0 1,140 01104455 Stormflow 08/06/2007 1547 08/06/2007 1726 -- 38 -- 6.4 103 01104455 Stormflow 09/11/2007 1308 09/11/2007 1903 -- 36 -- 6.6 67 01104455 Base flow 09/25/2007 1130 -- -- 0.06 0.4 9.40 7.2 1,050 01104460 Stormflow 12/01/2006 1639 12/03/2006 1413 -- 3.3 -- 7.2 353 01104460 Base flow 12/12/2006 1315 -- -- 27.00 7.7 13.30 7.3 440 01104460 Base flow 02/12/2007 1330 -- -- 12.00 12 12.90 7.3 521 01104460 Stormflow 03/02/2007 0457 03/03/2007 0504 -- 31 -- 7.0 499 01104460 Base flow 04/11/2007 0910 -- -- 33.00 2.8 12.10 7.2 404 01104460 Stormflow 04/27/2007 0606 04/29/2007 0526 -- 2.1 -- 7.3 391 01104460 Base flow 05/15/2007 1100 -- -- 20.00 2.1 8.50 6.9 451 01104460 Stormflow 07/05/2007 0206 07/06/2007 1440 -- 4.7 -- 7.3 558
Table 6 41

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Discharge, Dissolved pH, Specific 

USGS instantaneous Turbidity oxygen field conductance, Sample Begin Begin End End station (millions of (NTRU) (milligrams (standard laboratory type date time date time number gallons per day) per liter) units) (μS/cm)

P50051 P63676 P00300 P00400 P90095

01104460 Base flow 07/16/2007 1250 -- -- 4.60 2.5 7.80 7.1 59701104460 Stormflow 08/06/2007 1333 08/08/2007 0705 -- 4.0 -- 7.3 586

01104460 Stormflow 09/11/2007 1155 09/13/2007 0529 -- 5.5 -- 7.3 595

01104460 Base flow 09/25/2007 1155 -- -- 12.00 1.6 8.10 7.0 64301104475 Stormflow 12/01/2006 1620 12/02/2006 2004 -- 3.0 -- 7.5 223

01104475 Base flow 12/12/2006 1345 -- -- 0.65 2.0 12.60 7.7 24801104475 Base flow 02/12/2007 1345 -- -- 0.34 3.4 12.90 7.7 28101104475 Stormflow 03/02/2007 0549 03/02/2007 1829 -- 68 -- 7.0 270

01104475 Base flow 04/11/2007 0930 -- -- 1.20 2.7 12.50 7.5 27801104475 Stormflow 04/27/2007 0507 04/28/2007 1059 -- 3.2 -- 7.4 239

01104475 Base flow 05/15/2007 1140 -- -- 0.65 2.8 9.70 7.3 27301104475 Stormflow 07/05/2007 0207 07/06/2007 0128 -- 6.5 -- 7.1 285

01104475 Base flow 07/16/2007 1310 -- -- 0.11 1.8 8.60 7.5 29701104475 Stormflow 08/06/2007 1545 08/06/2007 2025 -- 30 -- 7.1 201

01104475 Stormflow 09/11/2007 1138 09/12/2007 1429 -- 38 -- 7.2 197

01104475 Base flow 09/25/2007 1220 -- -- 0.05 2.8 8.90 7.5 32101104475 Base flow 05/13/2008 1230 -- -- 0.63 -- 10.40 7.5 --

422302071083802 -- 12/14/2006 1230 -- -- -- 1.1 -- 7.3 491

422302071083802 -- 03/27/2007 1200 -- -- -- 1.0 -- 7.3 462

422302071083802 -- 08/15/2007 1500 -- -- -- 0.8 -- 7.2 499

422302071083802 -- 05/13/2008 1100 -- -- -- -- -- 7.2 --
42 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

USGS 

station 

number

Begin 

date

Specific 

conductance, 

field 

(μS/cm)

Temperature, 

water

(degrees Celsius)

Calcium, water, 

filtered 

(milligrams 

per liter)

Sodium, water, 

filtered 

(milligrams 

per liter)

Chloride, water, 

filtered

(milligrams 

per liter)

Sulfate, water, 

filtered

(milligrams 

per liter)

Total nitrogen, 

unfiltered 

(milligrams 

per liter)

P00095 P00010 P00915 P00930 P00940 P00945 P62855

01104390 12/11/2006 233 2.30 15.4 23.7 42.4 12.4 1.20

01104390 05/15/2007 264 13.70 15.9 27.6 50.5 10.5 0.9801104405 12/11/2006 252 3.00 11.9 30.3 55.0 10.5 0.6701104405 05/15/2007 284 11.40 12.9 37.0 62.6 8.52 0.7501104410 12/11/2006 985 5.10 35.4 125 244 11.5 0.4601104410 05/15/2007 984 11.20 34.8 138 265 10.3 0.5301104415 12/1/2006 386 10.5 59.3 98.9 7.17 1.5401104415 12/12/2006 1640 6.5 39.8 240 442 25.7 1.4801104415 2/12/2007 2150 2.7 53.3 364 653 29.2 1.5701104415 3/2/2007 3370 61.3 534 1050 47.2 3.1401104415 4/11/2007 1480 3.3 39.4 227 397 25.3 1.7901104415 4/27/2007 772 20.8 123 205 14.9 1.3501104415 5/14/2007 1840 13.4 46.5 286 518 26.6 1.6701104415 7/5/2007 886 21.6 136 239 16.3 1.8201104415 7/16/2007 2450 17.7 58.6 377 693 30.4 1.4401104415 8/6/2007 2270 53 385 666 26.2 2.3501104415 9/11/2007 345 10.7 48.8 80.4 15.6 2.101104415 9/25/2007 1830 16.4 51.3 306 564 30 1.201104420 12/11/2006 1020 3.90 31.3 125 234 18.3 0.8901104420 05/15/2007 1570 12.70 34.5 157 282 11.4 0.82
Table 6 43

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Specific Calcium, water, Sodium, water, Chloride, water, Sulfate, water, Total nitrogen, Temperature, conductance, filtered filtered filtered filtered unfiltered USGS water Begin field (milligrams (milligrams (milligrams (milligrams (milligrams station (degrees Celsius) date (μS/cm) per liter) per liter) per liter) per liter) per liter) number

P00095 P00010 P00915 P00930 P00940 P00945 P62855

01104430 12/12/2006 626 5.10 20.2 86.6 165 11.7 0.50

01104430 05/15/2007 627 14.50 19.6 90.1 163 12.8 0.51

01104430 01/31/2008 1730 5.50 44.9 275 504 27.6 --

01104433 12/01/2006 623 26.0 85.7 155 13.1 1.10

01104433 12/12/2006 1720 7.40 65.9 215 434 30.8 2.03

01104433 02/12/2007 1920 -0.10 72.3 251 524 32.9 1.93

01104433 03/02/2007 986 -- 23.5 144 281 11.9 1.10

01104433 04/11/2007 1970 4.10 75.8 266 554 29.5 2.04

01104433 05/14/2007 1800 18.00 65.1 234 459 25.1 1.47

01104433 05/16/2007 512 -- 20.1 71.6 132 9.94 1.44

01104433 07/04/2007 578 -- 23.4 76.0 148 13.0 1.74

01104433 07/16/2007 1800 20.30 73.2 235 493 29.8 2.00

01104433 08/06/2007 770 -- 32.7 112 197 14.5 1.84

01104433 09/11/2007 426 -- 19.1 54.2 101 12.4 1.67

01104433 09/25/2007 1670 17.30 75.3 248 486 34.2 1.69

01104453 12/12/2006 440 2.70 16.9 58.8 100 16.5 1.35

01104453 05/15/2007 515 17.90 18.1 69.5 124 14.7 0.99

01104455 12/01/2006 337 -- 12.4 46.4 74.8 12.2 1.33

01104455 12/12/2006 1040 10.90 31.8 139 244 30.5 1.70

01104455 01/08/2007 281 -- 9.06 39.7 65.0 11.1 0.87
44 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms] Specific Calcium, water, Sodium, water, Chloride, water, Sulfate, water, Total nitrogen, Temperature, conductance, filtered filtered filtered filtered unfiltered USGS water Begin field (milligrams (milligrams (milligrams (milligrams (milligrams station (degrees Celsius) date (μS/cm) per liter) per liter) per liter) per liter) per liter) number P00095 P00010 P00915 P00930 P00940 P00945 P62855 01104455 02/12/2007 1060 9.00 33.0 150 254 31.8 2.33 01104455 03/02/2007 1100 -- 28.6 159 317 12.0 1.40 01104455 03/11/2007 967 -- 20.3 151 265 20.4 1.46 01104455 04/11/2007 1000 7.80 34.5 139 253 24.7 1.62 01104455 04/27/2007 368 -- 13.1 53.4 93.2 10.2 1.11 01104455 05/14/2007 1280 11.30 38.1 164 307 28.1 2.13 01104455 05/16/2007 152 -- 5.99 20.6 32.3 5.88 2.25 01104455 07/04/2007 155 -- 5.66 20.4 33.3 6.03 1.93 01104455 07/16/2007 1110 13.20 38.0 156 287 30.4 2.46 01104455 08/06/2007 99 -- 4.35 12.4 18.6 4.35 1.58 01104455 09/11/2007 65 -- 2.99 7.47 11.4 2.85 1.17 01104455 09/25/2007 1050 13.60 38.8 146 266 30.4 1.93 01104460 12/01/2006 350 -- 16.2 44.9 79.2 11.2 0.86 01104460 12/12/2006 438 4.20 18.1 55.6 104 13.1 0.95 01104460 02/12/2007 535 2.90 20.6 68.4 129 15.4 1.20 01104460 03/02/2007 494 -- 14.6 65.6 128 11.3 1.60 01104460 04/11/2007 402 4.90 17.0 50.6 91.5 13.5 0.99 01104460 04/27/2007 383 -- 15.2 50.8 92.6 11.9 0.71 01104460 05/15/2007 450 14.70 18.8 57.7 105 12.3 0.83 01104460 07/05/2007 383 -- 18.8 74.1 138 12.3 0.72
Table 6 45

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Specific Calcium, water, Sodium, water, Chloride, water, Sulfate, water, Total nitrogen, Temperature, conductance, filtered filtered filtered filtered unfiltered USGS water Begin field (milligrams (milligrams (milligrams (milligrams (milligrams station (degrees Celsius) date (μS/cm) per liter) per liter) per liter) per liter) per liter) number

P00095 P00010 P00915 P00930 P00940 P00945 P62855

01104460 07/16/2007 585 21.00 20.8 79.3 149 11.6 0.58

01104460 08/06/2007 575 -- 21.0 84.7 150 10.9 0.66

01104460 09/11/2007 578 -- 19.4 80.9 150 12.9 0.71

01104460 09/25/2007 644 19.50 20.4 89.8 170 12.7 0.42

01104475 12/01/2006 221 -- 15.4 21.0 29.7 17.5 1.77

01104475 12/12/2006 243 6.10 16.6 23.4 35.7 19.8 1.99

01104475 02/12/2007 286 3.20 18.5 28.1 41.9 22.1 2.46

01104475 03/02/2007 267 -- 9.89 33.4 59.5 10.4 2.77

01104475 04/11/2007 277 5.80 16.4 28.6 49.4 17.8 1.75

01104475 04/27/2007 232 -- 13.8 25.1 38.5 14.8 1.49

01104475 05/15/2007 268 13.30 17.3 27.6 44.8 16.1 1.24

01104475 07/05/2007 279 -- 17.1 30.5 47.5 16.9 1.96

01104475 07/16/2007 288 17.30 17.4 30.7 48.0 17.3 1.84

01104475 08/06/2007 198 -- 13.1 21.5 29.2 10.8 3.01

01104475 09/11/2007 191 -- 13.0 18.0 23.2 18.3 3.06

01104475 09/25/2007 319 15.80 20.7 33.4 46.4 21.9 3.14

01104475 05/13/2008 335 12.90 -- -- -- -- --

422302071083802 12/14/2006 496 -- 21.0 61.0 120 12.8 0.65

422302071083802 03/27/2007 458 -- 20.4 58.6 110 14.4 0.92

422302071083802 08/15/2007 493 -- 19.8 63.9 121 12.7 0.67

422302071083802 05/13/2008 500 -- -- -- -- -- --
46 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

USGS 

station 

number

Begin 

date

Phosphorus, 

unfiltered 

(milligrams 

per liter)

2,4,5-T, 

surrogate 

(percent 

recovery

2,4-D methyl ester, 

(micrograms 

per liter)

2,4-D, 

(micrograms 

per liter)

2,4-DB, 

(micrograms 

per liter)

2-Chloro-4-

isopropylamino-6-

amino-s-triazine 

(micrograms 

per liter)

2-Chloro-6-

ethylamino-4-

amino-s-triazine 

(micrograms 

per liter)

P00665 P99958) P50470 P39732 P38746 P04040 P04038

01104390 12/11/2006 0.019 E49.3 <0.2 <0.04 <0.020 <0.02 <0.0801104390 05/15/2007 0.027 66.9 <0.2 <0.04 <0.02 <0.02 <0.0801104405 12/11/2006 0.025 E59.7 <0.2 <0.04 <0.020 <0.02 <0.0801104405 05/15/2007 0.038 65.0 <0.2 <0.04 <0.02 <0.02 <0.0801104410 12/11/2006 0.014 E78.7 <0.2 <0.04 <0.020 <0.02 <0.0801104410 05/15/2007 0.022 55.5 <0.2 <0.04 <0.02 <0.02 E0.0101104415 12/1/2006 0.31 78.4 <0.2 0.519 <0.020 <0.02 <0.0801104415 12/12/2006 0.011 64.9 <0.2 <0.04 <0.020 <0.02 <0.0801104415 2/12/2007 E0.006 59.8 <0.2 <0.04 <0.02 <0.02 <0.0801104415 3/2/2007 0.53 78 <0.2 <0.04 <0.02 <0.02 <0.0801104415 4/11/2007 E0.008 68.2 <0.2 <0.04 <0.02 <0.02 <0.0801104415 4/27/2007 0.04 59.6 <0.2 0.143 <0.02 <0.02 <0.0801104415 5/14/2007 0.011 66.2 <0.2 <0.04 <0.02 <0.02 <0.0801104415 7/5/2007 0.2 44.6 <0.2 <0.04 <0.02 <0.02 <0.0801104415 7/16/2007 0.012 60.1 <0.2 <0.04 <0.02 <0.02 <0.0801104415 8/6/2007 0.08 52.4 <0.2 <0.04 <0.02 <0.02 <0.0801104415 9/11/2007 0.28 45.8 <0.2 E0.265 <0.02 <0.02 <0.0801104415 9/25/2007 0.015 64.2 <0.2 <0.04 <0.02 <0.02 <0.0801104420 12/11/2006 0.018 E58.2 <0.2 <0.04 <0.020 <0.02 <0.0801104420 05/15/2007 0.039 62.9 <0.2 E0.018 <0.02 <0.02 <0.08
Table 6 47

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

2-Chloro-4- 2-Chloro-6- Phosphorus, 2,4,5-T, USGS 2,4-D methyl ester, 2,4-D, 2,4-DB, isopropylamino-6- ethylamino-4- Begin unfiltered surrogate station (micrograms (micrograms (micrograms amino-s-triazine amino-s-triazine date (milligrams (percent number per liter) per liter) per liter) (micrograms (micrograms per liter) recovery per liter) per liter)

P00665 P99958) P50470 P39732 P38746 P04040 P04038

01104430 12/12/2006 0.011 E54.4 <0.2 <0.04 <0.020 <0.02 <0.08

01104430 05/15/2007 0.014 69.8 <0.2 <0.04 <0.02 <0.02 <0.08

01104430 01/31/2008 -- -- -- -- -- -- --01104433 12/01/2006 0.070 66.1 <0.2 <0.04 <0.020 <0.02 <0.08

01104433 12/12/2006 0.124 52.1 E0.041 <0.04 <0.020 <0.02 <0.08

01104433 02/12/2007 0.018 59.1 <0.2 <0.04 <0.02 <0.02 <0.08

01104433 03/02/2007 0.090 59.5 <0.2 <0.04 <0.02 <0.02 <0.08

01104433 04/11/2007 0.015 60.1 <0.2 <0.04 <0.02 <0.02 <0.08

01104433 05/14/2007 0.022 76.9 <0.2 <0.04 <0.02 <0.02 <0.08

01104433 05/16/2007 0.090 98.5 <0.2 0.17 <0.02 <0.02 <0.0801104433 07/04/2007 0.200 48.7 <0.2 0.38 <0.02 <0.02 <0.0801104433 07/16/2007 0.037 64.3 <0.2 <0.04 <0.02 <0.02 <0.08

01104433 08/06/2007 0.190 91.1 <0.2 0.12 <0.02 <0.02 <0.08

01104433 09/11/2007 0.220 64.4 <0.2 E0.050 <0.02 <0.02 <0.08

01104433 09/25/2007 0.029 70.3 <0.2 <0.04 <0.02 <0.02 <0.08

01104453 12/12/2006 0.019 52.6 <0.2 <0.04 <0.020 <0.02 <0.08

01104453 05/15/2007 0.037 64.0 <0.2 E0.027 <0.02 <0.02 <0.08

01104455 12/01/2006 0.120 58.5 <0.2 <0.04 <0.020 <0.02 <0.08

01104455 12/12/2006 E.006 60.1 <0.2 <0.04 <0.020 <0.02 <0.08

01104455 01/08/2007 0.050 59.8 <0.2 <0.04 <0.02 <0.02 <0.08
48 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms] 2-Chloro-4- 2-Chloro-6- Phosphorus, 2,4,5-T, USGS 2,4-D methyl ester, 2,4-D, 2,4-DB, isopropylamino-6- ethylamino-4- Begin unfiltered surrogate station (micrograms (micrograms (micrograms amino-s-triazine amino-s-triazine date (milligrams (percent number per liter) per liter) per liter) (micrograms (micrograms per liter) recovery per liter) per liter) P00665 P99958) P50470 P39732 P38746 P04040 P04038 01104455 02/12/2007 E.006 72.3 <0.2 <0.04 <0.02 <0.02 E0.01 01104455 03/02/2007 0.240 69.8 <0.2 <0.04 <0.02 <0.02 <0.08 01104455 03/11/2007 0.090 65.2 <0.2 <0.04 <0.02 <0.02 <0.08 01104455 04/11/2007 E.006 63.9 <0.2 <0.04 <0.02 <0.02 E0.008 01104455 04/27/2007 0.090 61.9 <0.2 <0.04 <0.02 <0.02 E0.006 01104455 05/14/2007 0.011 75.6 <0.2 <0.04 <0.02 <0.02 E0.01 01104455 05/16/2007 0.360 87.7 <0.2 0.14 <0.02 <0.02 <0.08 01104455 07/04/2007 0.330 70.1 <0.2 E0.380 <0.02 <0.02 <0.08 01104455 07/16/2007 0.009 68.3 <0.2 <0.04 <0.02 <0.02 <0.08 01104455 08/06/2007 0.220 73.6 <0.2 <0.04 <0.02 <0.02 <0.08 01104455 09/11/2007 0.190 62.0 <0.2 E0.189 <0.02 <0.02 <0.08 01104455 09/25/2007 0.009 67.3 <0.2 <0.04 <0.02 <0.02 E0.010 01104460 12/01/2006 0.031 51.0 <0.2 <0.04 <0.020 <0.02 <0.08 01104460 12/12/2006 0.027 66.3 <0.2 <0.04 <0.020 <0.02 <0.08 01104460 02/12/2007 0.041 55.7 <0.2 <0.04 <0.02 <0.02 <0.08 01104460 03/02/2007 0.176 65.5 <0.2 <0.04 <0.02 <0.02 <0.08 01104460 04/11/2007 0.015 62.6 <0.2 <0.04 <0.02 <0.02 <0.08 01104460 04/27/2007 0.020 62.7 <0.2 <0.04 <0.02 <0.02 <0.08 01104460 05/15/2007 0.023 68.5 <0.2 <0.04 <0.02 <0.02 <0.08 01104460 07/05/2007 0.033 58.7 <0.2 E0.027 <0.02 <0.02 <0.08
Table 6 49

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

2-Chloro-4- 2-Chloro-6- Phosphorus, 2,4,5-T, USGS 2,4-D methyl ester, 2,4-D, 2,4-DB, isopropylamino-6- ethylamino-4- Begin unfiltered surrogate station (micrograms (micrograms (micrograms amino-s-triazine amino-s-triazine date (milligrams (percent number per liter) per liter) per liter) (micrograms (micrograms per liter) recovery per liter) per liter)

P00665 P99958) P50470 P39732 P38746 P04040 P04038

01104460 07/16/2007 0.017 64.6 <0.2 <0.04 <0.02 <0.02 <0.08

01104460 08/06/2007 0.030 66.1 <0.2 <0.04 <0.02 <0.02 <0.08

01104460 09/11/2007 0.046 86.1 <0.2 <0.04 <0.02 <0.02 <0.08

01104460 09/25/2007 0.012 72.0 <0.2 <0.04 <0.02 <0.02 <0.08

01104475 12/01/2006 0.040 56.4 <0.2 <0.04 <0.020 <0.02 <0.08

01104475 12/12/2006 0.013 74.0 <0.2 <0.04 <0.020 <0.02 <0.08

01104475 02/12/2007 0.016 60.0 <0.2 <0.04 <0.02 <0.02 <0.08

01104475 03/02/2007 0.330 77.3 <0.2 <0.04 <0.02 <0.02 <0.08

01104475 04/11/2007 0.012 65.0 <0.2 <0.04 <0.02 <0.02 <0.08

01104475 04/27/2007 0.020 61.7 <0.2 <0.04 <0.02 <0.02 <0.08

01104475 05/15/2007 0.019 66.0 <0.2 <0.04 <0.02 <0.02 <0.08

01104475 07/05/2007 0.050 57.4 <0.2 E0.013 <0.02 <0.02 <0.08

01104475 07/16/2007 0.026 70.0 <0.2 <0.04 <0.02 <0.02 <0.08

01104475 08/06/2007 0.250 60.9 <0.2 <0.04 <0.02 <0.02 <0.08

01104475 09/11/2007 0.250 66.7 <0.2 E0.740 <0.02 <0.02 <0.08

01104475 09/25/2007 0.019 61.5 <0.2 <0.04 <0.02 <0.02 <0.08

01104475 05/13/2008 -- 84.9 <0.04 <0.02 <0.02 <0.06 <0.08

422302071083802 12/14/2006 E0.006 71.9 <0.2 <0.04 <0.020 <0.02 <0.08422302071083802 03/27/2007 E0.008 89.0 <0.2 <0.04 <0.02 <0.02 <0.08

422302071083802 08/15/2007 E0.006 74.9 <0.2 <0.04 <0.02 <0.02 <0.08

422302071083802 05/13/2008 -- 90.6 <0.04 <0.02 <0.02 <0.06 <0.08
50 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

USGS 

station 

number

Begin 

date

2-Hydroxy-4-

isopropylamino6-ethylaminos-triazine 

(micrograms 

per liter)

3-Hydroxy 

carbofuran 

(micrograms 

per liter)

Acifluorfen, water, 

recoverable 

(micrograms 

per liter)

Aldicarb sulfone 

(micrograms 

per liter)

Aldicarb sulfoxide 

(microgras 

per liter)

Aldicarb 

(micrograms 

per liter)

Atrazine, 

micrograms 

per liter

P50355 P49308 P49315 P49313 P49314 P49312 P39632

01104390 12/11/2006 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104390 05/15/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 E0.00201104405 12/11/2006 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104405 05/15/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 E0.000601104410 12/11/2006 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104410 05/15/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104415 12/1/2006 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104415 12/12/2006 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104415 2/12/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104415 3/2/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104415 4/11/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104415 4/27/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104415 5/14/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104415 7/5/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104415 7/16/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104415 8/6/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104415 9/11/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104415 9/25/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.0401104420 12/11/2006 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104420 05/15/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04
Table 6 51

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

2-Hydroxy-4-

isopropylamino- 3-Hydroxy Acifluorfen, water, Aldicarb sulfone Aldicarb sulfoxide Aldicarb Atrazine, 6-ethylamino- carbofuran recoverable USGS (micrograms (microgras (micrograms micrograms Begin s-triazine (micrograms (micrograms station per liter) per liter) per liter) per liter date (micrograms per liter) per liter) number per liter)

P50355 P49308 P49315 P49313 P49314 P49312 P39632

01104430 12/12/2006 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104430 05/15/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104430 01/31/2008 -- -- -- -- -- -- --01104433 12/01/2006 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104433 12/12/2006 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104433 02/12/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104433 03/02/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104433 04/11/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104433 05/14/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104433 05/16/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 E0.014

01104433 07/04/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04

01104433 07/16/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104433 08/06/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104433 09/11/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104433 09/25/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04

01104453 12/12/2006 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04

01104453 05/15/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 E0.002

01104455 12/01/2006 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04

01104455 12/12/2006 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104455 01/08/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04
52 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms] 2-Hydroxy-4- isopropylamino- 3-Hydroxy Acifluorfen, water, Aldicarb sulfone Aldicarb sulfoxide Aldicarb Atrazine, 6-ethylamino- carbofuran recoverable USGS (micrograms (microgras (micrograms micrograms Begin s-triazine (micrograms (micrograms station per liter) per liter) per liter) per liter date (micrograms per liter) per liter) number per liter) P50355 P49308 P49315 P49313 P49314 P49312 P39632 01104455 02/12/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 E0.002 01104455 03/02/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104455 03/11/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104455 04/11/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 E0.002 01104455 04/27/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104455 05/14/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 E0.001 01104455 05/16/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 E0.017 01104455 07/04/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104455 07/16/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104455 08/06/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104455 09/11/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104455 09/25/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104460 12/01/2006 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104460 12/12/2006 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104460 02/12/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 E0.001 01104460 03/02/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104460 04/11/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 E0.0009 01104460 04/27/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104460 05/15/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 E0.003 01104460 07/05/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04
Table 6 53

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

2-Hydroxy-4-

isopropylamino- 3-Hydroxy Acifluorfen, water, Aldicarb sulfone Aldicarb sulfoxide Aldicarb Atrazine, 6-ethylamino- carbofuran recoverable USGS (micrograms (microgras (micrograms micrograms Begin s-triazine (micrograms (micrograms station per liter) per liter) per liter) per liter date (micrograms per liter) per liter) number per liter)

P50355 P49308 P49315 P49313 P49314 P49312 P39632

01104460 07/16/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104460 08/06/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104460 09/11/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104460 09/25/2007 <0.08 <0.02 <0.06 <0.08 -- <0.04 <0.04

01104475 12/01/2006 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04

01104475 12/12/2006 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104475 02/12/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104475 03/02/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104475 04/11/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104475 04/27/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104475 05/15/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 E0.002

01104475 07/05/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04

01104475 07/16/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104475 08/06/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104475 09/11/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104475 09/25/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104475 05/13/2008 <0.04 <0.04 <0.04 <0.08 <0.06 <0.12 <0.04

422302071083802 12/14/2006 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04422302071083802 03/27/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04422302071083802 08/15/2007 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04422302071083802 05/13/2008 <0.04 <0.04 <0.04 <0.08 <0.06 <0.12 <0.04
54 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

USGS 

station 

number

Begin 

date

Barban, 

surrogate 

(percent 

recovery)

Bendiocarb 

(micrograms 

per liter)

Benomyl 

(micrograms 

per liter)

Bensulfuronmethyl 

(micrograms 

per liter)

Bentazon 

(micrograms 

per liter)

Bromacil 

(micrograms 

per liter)

Bromoxynil 

(micrograms 

per liter)

P90640 P50299 P50300 P61693 P38711 P04029 P49311

01104390 12/11/2006 E91.7 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104390 05/15/2007 92.7 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104405 12/11/2006 E79.2 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104405 05/15/2007 89.1 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104410 12/11/2006 E98.1 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104410 05/15/2007 71.5 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104415 12/1/2006 68.9 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104415 12/12/2006 E93.7 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104415 2/12/2007 74.9 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104415 3/2/2007 87.6 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104415 4/11/2007 88.4 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104415 4/27/2007 60.8 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104415 5/14/2007 82.7 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104415 7/5/2007 11.9 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104415 7/16/2007 53.7 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104415 8/6/2007 14.4 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104415 9/11/2007 7.1 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104415 9/25/2007 58.8 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104420 12/11/2006 E55.0 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104420 05/15/2007 94.5 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12
Table 6 55

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Barban, Bensulfuron- Bendiocarb Benomyl Bentazon Bromacil Bromoxynil surrogate methyl USGS (micrograms (micrograms (micrograms (micrograms (micrograms Begin (percent (micrograms station per liter) per liter) per liter) per liter) per liter) date recovery) per liter) number

P90640 P50299 P50300 P61693 P38711 P04029 P49311

01104430 12/12/2006 E101.1 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104430 05/15/2007 83.2 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104430 01/31/2008 -- -- -- -- -- -- --

01104433 12/01/2006 72.9 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104433 12/12/2006 E92.3 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104433 02/12/2007 79.7 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104433 03/02/2007 82.8 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104433 04/11/2007 81.3 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104433 05/14/2007 69.0 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104433 05/16/2007 59.1 <0.04 E0.005 <0.06 <0.02 <0.04 <0.12

01104433 07/04/2007 51.0 <0.04 E0.007 <0.06 <0.02 <0.04 <0.12

01104433 07/16/2007 64.1 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104433 08/06/2007 37.5 <0.04 E0.005 <0.06 <0.02 <0.04 <0.12

01104433 09/11/2007 19.2 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104433 09/25/2007 50.1 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104453 12/12/2006 E77.3 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104453 05/15/2007 67.4 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104455 12/01/2006 90.4 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104455 12/12/2006 80.2 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104455 01/08/2007 56.7 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12
56 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued

[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Barban, Bensulfuron- Bendiocarb Benomyl Bentazon Bromacil Bromoxynil surrogate methyl USGS (micrograms (micrograms (micrograms (micrograms (micrograms Begin (percent (micrograms station per liter) per liter) per liter) per liter) per liter) date recovery) per liter) number

P90640 P50299 P50300 P61693 P38711 P04029 P49311

01104455 02/12/2007 77.1 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104455 03/02/2007 91.7 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104455 03/11/2007 92.2 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104455 04/11/2007 85.1 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104455 04/27/2007 74.5 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104455 05/14/2007 82.8 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104455 05/16/2007 95.8 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104455 07/04/2007 14.0 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104455 07/16/2007 79.6 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104455 08/06/2007 17.4 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104455 09/11/2007 15.0 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104455 09/25/2007 E43.6 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104460 12/01/2006 94.4 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104460 12/12/2006 E60.1 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104460 02/12/2007 68.7 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104460 03/02/2007 96.8 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104460 04/11/2007 89.0 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104460 04/27/2007 80.5 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104460 05/15/2007 88.4 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104460 07/05/2007 71.7 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12
Table 6 57

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Barban, Bensulfuron- Bendiocarb Benomyl Bentazon Bromacil Bromoxynil surrogate methyl USGS (micrograms (micrograms (micrograms (micrograms (micrograms Begin (percent (micrograms station per liter) per liter) per liter) per liter) per liter) date recovery) per liter) number

P90640 P50299 P50300 P61693 P38711 P04029 P49311

01104460 07/16/2007 77.0 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104460 08/06/2007 65.7 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104460 09/11/2007 48.1 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104460 09/25/2007 70.7 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104475 12/01/2006 82.0 <0.04 E0.010 <0.06 <0.02 <0.04 <0.12

01104475 12/12/2006 86.4 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104475 02/12/2007 88.4 <0.04 E0.007 <0.06 <0.02 <0.04 <0.12

01104475 03/02/2007 104.0 <0.04 E0.006 <0.06 <0.02 <0.04 <0.12

01104475 04/11/2007 76.7 <0.04 E0.004 <0.06 <0.02 <0.04 <0.12

01104475 04/27/2007 69.3 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104475 05/15/2007 79.3 <0.04 E0.010 <0.06 <0.02 <0.04 <0.12

01104475 07/05/2007 75.3 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104475 07/16/2007 76.9 <0.04 E0.009 <0.06 <0.02 <0.04 <0.12

01104475 08/06/2007 46.0 <0.04 E0.009 <0.06 <0.02 <0.04 <0.12

01104475 09/11/2007 35.4 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104475 09/25/2007 E38.7 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104475 05/13/2008 74.6 <0.04 E0.017 <0.06 <0.04 <0.02 <0.12

422302071083802 12/14/2006 105.5 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

422302071083802 03/27/2007 81.0 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12422302071083802 08/15/2007 92.4 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12422302071083802 05/13/2008 75.3 <0.04 <0.04 <0.06 <0.04 <0.02 <0.12
58 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued

[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

USGS 

station 

number

Begin 

date

Caffeine 

(micrograms 

per liter)

Caffeine-13C, 

surrogate 

(percent recovery)

Carbaryl, 

(micrograms 

per liter)

Carbofuran, 

(micrograms 

per liter)

Chloramben 

methyl ester 

(micrograms 

per liter)

Chlorimuron 

(micrograms 

per liter)

Chlorodiaminos-triazine 

(micrograms 

per liter)

P50305 P99959 P49310 P49309 P61188 P50306 P04039

01104390 12/11/2006 <0.04 E58.6 <0.02 <0.06 <0.10 <0.08 <0.1201104390 05/15/2007 <0.04 69.9 <0.02 <0.06 <0.1 <0.08 <0.1201104405 12/11/2006 E0.084 E53.1 <0.02 <0.06 <0.10 <0.08 <0.1201104405 05/15/2007 <0.04 67.1 <0.02 <0.06 <0.1 <0.08 <0.1201104410 12/11/2006 <0.04 E64.9 <0.02 <0.06 <0.10 <0.08 <0.1201104410 05/15/2007 <0.04 43.2 <0.02 <0.06 <0.1 <0.0801104415 12/1/2006 E0.196 E61.5 <0.02 <0.06 <0.10 <0.08 <0.1201104415 12/12/2006 E0.073 E67.4 <0.02 <0.06 <0.10 <0.08 <0.1201104415 2/12/2007 <0.04 59.7 <0.02 <0.06 <0.1 <0.08 <0.1201104415 3/2/2007 0.445 64.8 <0.02 <0.06 <0.1 <0.08 <0.1201104415 4/11/2007 <0.04 60.1 <0.02 <0.06 <0.1 <0.08 <0.1201104415 4/27/2007 0.239 47.1 <0.02 <0.06 <0.1 <0.08 <0.1201104415 5/14/2007 E0.027 51.7 <0.02 <0.06 <0.1 <0.0801104415 7/5/2007 <0.04 30.3 0.051 <0.06 <0.1 <0.0801104415 7/16/2007 0.234 54.4 <0.02 <0.06 <0.1 <0.0801104415 8/6/2007 0.557 27.3 <0.02 <0.06 <0.1 <0.0801104415 9/11/2007 E0.368 E33.5 E0.009 <0.06 <0.1 <0.0801104415 9/25/2007 <0.04 E33.7 <0.02 <0.06 <0.1 <0.0801104420 12/11/2006 <0.04 E43.6 <0.02 <0.06 <0.10 <0.08 <0.1201104420 05/15/2007 E0.006 65.1 <0.02 <0.06 <0.1 <0.08 <0.12
Table 6 59

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Chloramben Chlorodiamino- Caffeine Caffeine-13C, Carbaryl, Carbofuran, Chlorimuron methyl ester s-triazine USGS (micrograms surrogate (micrograms (micrograms (micrograms Begin (micrograms (micrograms station per liter) (percent recovery) per liter) per liter) per liter) date per liter) per liter) number

P50305 P99959 P49310 P49309 P61188 P50306 P04039

01104430 12/12/2006 <0.04 E57.9 <0.02 <0.06 <0.10 <0.08 <0.12

01104430 05/15/2007 E0.034 50.0 <0.02 <0.06 <0.1 <0.08 --

01104430 01/31/2008 -- -- -- -- -- -- --

01104433 12/01/2006 E0.158 E55.1 <0.02 <0.06 <0.10 <0.08 <0.12

01104433 12/12/2006 <0.04 E52.8 <0.02 <0.06 <0.10 <0.08 <0.12

01104433 02/12/2007 E0.021 49.0 <0.02 <0.06 <0.1 <0.08 <0.12

01104433 03/02/2007 0.17 69.5 <0.02 <0.06 <0.1 <0.08 <0.12

01104433 04/11/2007 0.19 54.2 <0.02 <0.06 <0.1 <0.08 <0.12

01104433 05/14/2007 0.12 E53.1 <0.02 <0.06 <0.1 <0.08 --01104433 05/16/2007 0.13 46.9 <0.02 <0.06 <0.1 <0.08 <0.12

01104433 07/04/2007 0.21 51.4 <0.02 <0.06 <0.1 <0.08 --

01104433 07/16/2007 0.06 36.8 <0.02 <0.06 <0.1 <0.08 --

01104433 08/06/2007 0.23 56.8 <0.02 <0.06 <0.1 <0.08 --

01104433 09/11/2007 E0.164 E34.5 <0.02 <0.06 <0.1 <0.08 --01104433 09/25/2007 <0.04 E26.6 <0.02 <0.06 <0.1 <0.08 --01104453 12/12/2006 <0.04 E64.1 E0.014 <0.06 <0.10 <0.08 <0.12

01104453 05/15/2007 <0.04 59.6 <0.02 <0.06 <0.1 <0.08 <0.12

01104455 12/01/2006 E0.185 E82.6 <0.02 <0.06 <0.10 <0.08 <0.12

01104455 12/12/2006 <0.04 E63.6 <0.02 <0.06 <0.10 <0.08 <0.12

01104455 01/08/2007 E0.104 57.8 <0.02 <0.06 <0.1 <0.08 <0.12
60 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued

[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Chloramben Chlorodiamino- Caffeine Caffeine-13C, Carbaryl, Carbofuran, Chlorimuron methyl ester s-triazine USGS (micrograms surrogate (micrograms (micrograms (micrograms Begin (micrograms (micrograms station per liter) (percent recovery) per liter) per liter) per liter) date per liter) per liter) number

P50305 P99959 P49310 P49309 P61188 P50306 P04039

01104455 02/12/2007 <0.04 66.1 <0.02 <0.06 <0.1 <0.08 <0.12

01104455 03/02/2007 0.12 74.2 <0.02 <0.06 <0.1 <0.08 <0.12

01104455 03/11/2007 0.13 74.4 <0.02 <0.06 <0.1 <0.08 <0.12

01104455 04/11/2007 <0.04 63.8 <0.02 <0.06 <0.1 <0.08 <0.12

01104455 04/27/2007 0.17 60.6 <0.02 <0.06 <0.1 <0.08 --

01104455 05/14/2007 <0.04 E60.0 <0.02 <0.06 <0.1 <0.08 --01104455 05/16/2007 0.08 83.6 <0.02 <0.06 <0.1 <0.08 <0.12

01104455 07/04/2007 0.11 49.6 <0.02 <0.06 <0.1 <0.08 --

01104455 07/16/2007 <0.04 58.9 <0.02 <0.06 <0.1 <0.08 --

01104455 08/06/2007 0.17 67.6 <0.02 <0.06 <0.1 <0.08 --

01104455 09/11/2007 E0.131 E32.1 <0.02 <0.06 <0.1 <0.08 --01104455 09/25/2007 <0.04 E84.1 <0.02 <0.06 <0.1 <0.08 --01104460 12/01/2006 E0.005 E56.4 <0.02 <0.06 <0.10 <0.08 <0.12

01104460 12/12/2006 <0.04 E55.3 <0.02 <0.06 <0.10 <0.08 <0.12

01104460 02/12/2007 <0.04 50.5 <0.02 <0.06 <0.1 <0.08 <0.12

01104460 03/02/2007 E0.028 61.0 <0.02 <0.06 <0.1 <0.08 <0.12

01104460 04/11/2007 E0.004 56.4 <0.02 <0.06 <0.1 <0.08 <0.12

01104460 04/27/2007 E0.015 60.9 <0.02 <0.06 <0.1 <0.08 <0.12

01104460 05/15/2007 <0.04 43.8 <0.02 <0.06 <0.1 <0.08 --

01104460 07/05/2007 E0.018 51.3 <0.02 <0.06 <0.1 <0.08 --
Table 6 61

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Chloramben Chlorodiamino- Caffeine Caffeine-13C, Carbaryl, Carbofuran, Chlorimuron methyl ester s-triazine USGS (micrograms surrogate (micrograms (micrograms (micrograms Begin (micrograms (micrograms station per liter) (percent recovery) per liter) per liter) per liter) date per liter) per liter) number

P50305 P99959 P49310 P49309 P61188 P50306 P04039

01104460 07/16/2007 <0.04 43.3 <0.02 <0.06 <0.1 <0.08 --

01104460 08/06/2007 E0.015 38.1 <0.02 <0.06 <0.1 <0.08 --

01104460 09/11/2007 E0.026 E38.8 <0.02 <0.06 <0.1 <0.08 --01104460 09/25/2007 <0.04 E31.7 <0.02 <0.06 <0.1 <0.08 --01104475 12/01/2006 <0.04 E55.2 0.06 <0.06 <0.10 <0.08 <0.12

01104475 12/12/2006 <0.04 E68.6 E0.051 <0.06 <0.10 <0.08 <0.12

01104475 02/12/2007 <0.04 60.4 E0.013 <0.06 <0.1 <0.08 <0.12

01104475 03/02/2007 E0.030 63.2 E0.017 <0.06 <0.1 <0.08 <0.12

01104475 04/11/2007 <0.04 57.4 E0.012 <0.06 <0.1 <0.08 <0.12

01104475 04/27/2007 E0.008 61.1 E0.009 <0.06 <0.1 <0.08 <0.12

01104475 05/15/2007 <0.04 56.3 E0.006 <0.06 <0.1 <0.08 <0.12

01104475 07/05/2007 E0.039 50.3 <0.02 <0.06 <0.1 <0.08 --

01104475 07/16/2007 <0.04 53.3 E0.002 <0.06 <0.1 <0.08 --01104475 08/06/2007 0.06 46.5 <0.02 <0.06 <0.1 <0.08 --

01104475 09/11/2007 E0.042 E34.9 <0.02 <0.06 <0.1 <0.08 --01104475 09/25/2007 <0.04 E69.5 <0.02 <0.06 <0.1 <0.08 --01104475 05/13/2008 <0.06 66.2 <0.04 <0.02 <0.1 <0.08 --

422302071083802 12/14/2006 E0.006 E76.9 E0.021 <0.06 <0.10 <0.08 <0.12

422302071083802 03/27/2007 <0.04 43.5 E0.003 <0.06 <0.1 <0.08 <0.04422302071083802 08/15/2007 <0.04 47.1 <0.02 <0.06 <0.1 <0.08 --

422302071083802 05/13/2008 <0.06 71.1 <0.04 <0.02 <0.1 <0.08 --
62 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

USGS 

station 

number

Begin 

date

Clopyralid 

(micrograms 

per liter)

Cycloate 

(micrograms 

per liter)

Dacthal monoacid, 

(micrograms 

per liter)

Dicamba 

(micrograms 

per liter)

Dichlorprop 

(micrograms 

per liter)

Dinoseb 

(micrograms 

per liter)

Diphenamid 

(micrograms 

per liter)

P49305 P04031 P49304 P38442 P49302 P49301 P04033

01104390 12/11/2006 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104390 05/15/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104405 12/11/2006 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104405 05/15/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104410 12/11/2006 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104410 05/15/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104415 12/1/2006 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104415 12/12/2006 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104415 2/12/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104415 3/2/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104415 4/11/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104415 4/27/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104415 5/14/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104415 7/5/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104415 7/16/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104415 8/6/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104415 9/11/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104415 9/25/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104420 12/11/2006 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104420 05/15/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04
Table 6 63

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Clopyralid Cycloate Dacthal monoacid, Dicamba Dichlorprop Dinoseb Diphenamid 

USGS (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms Begin station per liter) per liter) per liter) per liter) per liter) per liter) per liter) date number

P49305 P04031 P49304 P38442 P49302 P49301 P04033

01104430 12/12/2006 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104430 05/15/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104430 01/31/2008 -- -- -- -- -- -- --01104433 12/01/2006 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104433 12/12/2006 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104433 02/12/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104433 03/02/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104433 04/11/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104433 05/14/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104433 05/16/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104433 07/04/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104433 07/16/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104433 08/06/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104433 09/11/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104433 09/25/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104453 12/12/2006 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104453 05/15/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104455 12/01/2006 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104455 12/12/2006 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104455 01/08/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04
64 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued

[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Clopyralid Cycloate Dacthal monoacid, Dicamba Dichlorprop Dinoseb Diphenamid 

USGS (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms Begin station per liter) per liter) per liter) per liter) per liter) per liter) per liter) date number

P49305 P04031 P49304 P38442 P49302 P49301 P04033

01104455 02/12/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104455 03/02/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104455 03/11/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104455 04/11/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104455 04/27/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104455 05/14/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104455 05/16/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104455 07/04/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104455 07/16/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104455 08/06/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104455 09/11/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104455 09/25/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104460 12/01/2006 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104460 12/12/2006 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104460 02/12/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104460 03/02/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104460 04/11/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104460 04/27/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104460 05/15/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104460 07/05/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04
Table 6 65

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Clopyralid Cycloate Dacthal monoacid, Dicamba Dichlorprop Dinoseb Diphenamid 

USGS (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms Begin station per liter) per liter) per liter) per liter) per liter) per liter) per liter) date number

P49305 P04031 P49304 P38442 P49302 P49301 P04033

01104460 07/16/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104460 08/06/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104460 09/11/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104460 09/25/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104475 12/01/2006 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104475 12/12/2006 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104475 02/12/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104475 03/02/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104475 04/11/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104475 04/27/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104475 05/15/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104475 07/05/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104475 07/16/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104475 08/06/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104475 09/11/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104475 09/25/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104475 05/13/2008 <0.06 <0.02 <0.02 <0.04 <0.02 <0.04 <0.04

422302071083802 12/14/2006 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04422302071083802 03/27/2007 <0.06 <0.06 <0.02 <0.08 <0.04 E0.017 <0.04422302071083802 08/15/2007 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04422302071083802 05/13/2008 <0.06 <0.02 <0.02 <0.04 <0.02 <0.04 <0.04
66 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

USGS 

station 

number

Begin 

date

Diuron 

(micrograms 

per liter)

Fenuron 

(micrograms 

per liter)

Flumetsulam 

(micrograms 

per liter)

Fluometuron 

(micrograms 

per liter)

Imazaquin 

(micrograms 

per liter)

Imazethapyr 

(micrograms 

per liter)

Imidacloprid 

(micrograms 

per liter)

P49300 P49297 P61694 P38811 P50356 P50407 P61695

01104390 12/11/2006 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.0601104390 05/15/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 E0.01301104405 12/11/2006 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.0601104405 05/15/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.0601104410 12/11/2006 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.0601104410 05/15/2007 E0.016 <0.04 <0.06 <0.04 <0.04 <0.04 <0.0601104415 12/1/2006 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.0601104415 12/12/2006 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.0601104415 2/12/2007 E0.006 <0.04 <0.06 <0.04 <0.04 <0.04 <0.0601104415 3/2/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.0601104415 4/11/2007 E0.003 <0.04 <0.06 <0.04 <0.04 <0.04 <0.0601104415 4/27/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.0601104415 5/14/2007 E0.018 <0.04 <0.06 <0.04 <0.04 <0.04 <0.0601104415 7/5/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 0.09201104415 7/16/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.0601104415 8/6/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.0601104415 9/11/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 0.17801104415 9/25/2007 E0.007 <0.04 <0.06 <0.04 <0.04 <0.04 <0.0601104420 12/11/2006 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.0601104420 05/15/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 E0.014
Table 6 67

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Diuron Fenuron Flumetsulam Fluometuron Imazaquin Imazethapyr Imidacloprid 

USGS (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms Begin station per liter) per liter) per liter) per liter) per liter) per liter) per liter) date number

P49300 P49297 P61694 P38811 P50356 P50407 P61695

01104430 12/12/2006 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104430 05/15/2007 E0.013 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104430 01/31/2008 -- -- -- -- -- -- --

01104433 12/01/2006 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104433 12/12/2006 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104433 02/12/2007 E0.009 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104433 03/02/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104433 04/11/2007 E0.005 <0.04 <0.06 <0.04 <0.04 <0.04 E0.036

01104433 05/14/2007 E0.027 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104433 05/16/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104433 07/04/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 0.18

01104433 07/16/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104433 08/06/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 0.14

01104433 09/11/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104433 09/25/2007 E0.012 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104453 12/12/2006 E0.026 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104453 05/15/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 E0.016

01104455 12/01/2006 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104455 12/12/2006 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104455 01/08/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06
68 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms] Diuron Fenuron Flumetsulam Fluometuron Imazaquin Imazethapyr Imidacloprid USGS (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms Begin station per liter) per liter) per liter) per liter) per liter) per liter) per liter) date number P49300 P49297 P61694 P38811 P50356 P50407 P61695 01104455 02/12/2007 E0.008 <0.04 <0.06 <0.04 <0.04 <0.04 E0.021 01104455 03/02/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104455 03/11/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104455 04/11/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104455 04/27/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104455 05/14/2007 E0.013 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104455 05/16/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104455 07/04/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104455 07/16/2007 E0.006 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104455 08/06/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104455 09/11/2007 <0.04 E0.036 <0.06 <0.04 <0.04 <0.04 <0.06 01104455 09/25/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 E0.020 01104460 12/01/2006 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104460 12/12/2006 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104460 02/12/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104460 03/02/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104460 04/11/2007 E0.001 <0.04 <0.06 <0.04 <0.04 <0.04 E0.005 01104460 04/27/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104460 05/15/2007 E0.014 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104460 07/05/2007 E0.003 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06
Table 6 69

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Diuron Fenuron Flumetsulam Fluometuron Imazaquin Imazethapyr Imidacloprid 

USGS (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms Begin station per liter) per liter) per liter) per liter) per liter) per liter) per liter) date number

P49300 P49297 P61694 P38811 P50356 P50407 P61695

01104460 07/16/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104460 08/06/2007 E0.004 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104460 09/11/2007 E0.008 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104460 09/25/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104475 12/01/2006 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 E0.177

01104475 12/12/2006 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 E0.19301104475 02/12/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 0.09

01104475 03/02/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 E0.051

01104475 04/11/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 0.13

01104475 04/27/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 0.13

01104475 05/15/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 0.14

01104475 07/05/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 0.11

01104475 07/16/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 0.11

01104475 08/06/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 0.12

01104475 09/11/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06

01104475 09/25/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 E1.21

01104475 05/13/2008 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 0.09

422302071083802 12/14/2006 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06422302071083802 03/27/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06422302071083802 08/15/2007 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06422302071083802 05/13/2008 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06
70 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

USGS 

station 

number

Begin 

date

Linuron, 

(micrograms 

per liter)

2-methyl-4-

chlorophenoxyacetic 

acid (MCPA) 

(micrograms 

per liter)

4-(4-chloro-2-

methylphenoxy)

butanoic 

acid (MCPB) 

(micrograms 

per liter)

Metalaxyl 

(micrograms 

per liter)

Methiocarb 

(micrograms 

per liter)

Methomyl 

(micrograms 

per liter)

Metsulfuron 

(micrograms 

per liter)

P38478 P38482 P38487 P50359 P38501 P49296 P61697

01104390 12/11/2006 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104390 05/15/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104405 12/11/2006 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104405 05/15/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104410 12/11/2006 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104410 05/15/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104415 12/1/2006 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104415 12/12/2006 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104415 2/12/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104415 3/2/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104415 4/11/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104415 4/27/2007 <0.04 E0.012 <0.2 <0.04 <0.04 <0.06 <0.1401104415 5/14/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104415 7/5/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104415 7/16/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104415 8/6/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104415 9/11/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104415 9/25/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104420 12/11/2006 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104420 05/15/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14
Table 6 71

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

4-(4-chloro-2- 2-methyl-4- methylphenoxy) Linuron, chlorophenoxyacetic Metalaxyl Methiocarb Methomyl Metsulfuron butanoic USGS (micrograms acid (MCPA) (micrograms (micrograms (micrograms (micrograms Begin acid (MCPB) station per liter) (micrograms per liter) per liter) per liter) per liter) date (micrograms number per liter) per liter)

P38478 P38482 P38487 P50359 P38501 P49296 P61697

01104430 12/12/2006 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104430 05/15/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104430 01/31/2008 -- -- -- -- -- -- --

01104433 12/01/2006 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104433 12/12/2006 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104433 02/12/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104433 03/02/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104433 04/11/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104433 05/14/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104433 05/16/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104433 07/04/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104433 07/16/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104433 08/06/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104433 09/11/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104433 09/25/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104453 12/12/2006 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104453 05/15/2007 <0.04 <0.06 <0.2 E0.004 <0.04 <0.06 <0.14

01104455 12/01/2006 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104455 12/12/2006 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104455 01/08/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14
72 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms] 4-(4-chloro-2- 2-methyl-4- methylphenoxy) Linuron, chlorophenoxyacetic Metalaxyl Methiocarb Methomyl Metsulfuron butanoic USGS (micrograms acid (MCPA) (micrograms (micrograms (micrograms (micrograms Begin acid (MCPB) station per liter) (micrograms per liter) per liter) per liter) per liter) date (micrograms number per liter) per liter) P38478 P38482 P38487 P50359 P38501 P49296 P61697 01104455 02/12/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104455 03/02/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104455 03/11/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104455 04/11/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104455 04/27/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104455 05/14/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104455 05/16/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104455 07/04/2007 <0.04 E0.015 <0.2 <0.04 <0.04 <0.06 <0.14 01104455 07/16/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104455 08/06/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104455 09/11/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104455 09/25/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104460 12/01/2006 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104460 12/12/2006 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104460 02/12/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104460 03/02/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104460 04/11/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104460 04/27/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104460 05/15/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104460 07/05/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14
Table 6 73

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

4-(4-chloro-2- 2-methyl-4- methylphenoxy) Linuron, chlorophenoxyacetic Metalaxyl Methiocarb Methomyl Metsulfuron butanoic USGS (micrograms acid (MCPA) (micrograms (micrograms (micrograms (micrograms Begin acid (MCPB) station per liter) (micrograms per liter) per liter) per liter) per liter) date (micrograms number per liter) per liter)

P38478 P38482 P38487 P50359 P38501 P49296 P61697

01104460 07/16/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104460 08/06/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104460 09/11/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104460 09/25/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104475 12/01/2006 <0.04 <0.06 <0.2 E0.023 <0.04 <0.06 <0.14

01104475 12/12/2006 <0.04 <0.06 <0.2 E0.028 <0.04 <0.06 <0.14

01104475 02/12/2007 <0.04 <0.06 <0.2 E0.024 <0.04 <0.06 <0.14

01104475 03/02/2007 <0.04 <0.06 <0.2 E0.014 <0.04 <0.06 <0.14

01104475 04/11/2007 <0.04 <0.06 <0.2 E0.013 <0.04 <0.06 <0.14

01104475 04/27/2007 <0.04 <0.06 <0.2 E0.016 <0.04 <0.06 <0.14

01104475 05/15/2007 <0.04 <0.06 <0.2 E0.015 <0.04 <0.06 <0.14

01104475 07/05/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104475 07/16/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104475 08/06/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104475 09/11/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104475 09/25/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104475 05/13/2008 <0.02 <0.06 <0.06 E0.015 <0.04 <0.12 <0.14

422302071083802 12/14/2006 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

422302071083802 03/27/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

422302071083802 08/15/2007 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

422302071083802 05/13/2008 <0.02 <0.06 <0.06 <0.02 <0.04 <0.12 <0.14
74 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms] USGS station number Begin date N-(4- Chlorophenyl)- N’-methylurea (micrograms per liter) Neburon (micrograms per liter) Nicosulfuron (micrograms per liter) Norflurazon (micrograms per liter) Oryzalin (micrograms per liter) Oxamyl (micrograms per liter) Picloram (micrograms per liter) P61692 P49294 P50364 P49293 P49292 P38866 P49291 01104390 12/11/2006 <0.06 <0.02 <0.10 <0.04 <0.04 <0.04 <0.12 01104390 05/15/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104405 12/11/2006 <0.06 <0.02 <0.10 <0.04 <0.04 <0.04 <0.12 01104405 05/15/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104410 12/11/2006 <0.06 <0.02 <0.10 <0.04 <0.04 <0.04 <0.12 01104410 05/15/2007 <0.06 <0.02 <0.1 0.18 <0.04 <0.04 <0.12 01104415 12/1/2006 <0.06 <0.02 <0.10 <0.04 <0.04 <0.04 <0.12 01104415 12/12/2006 <0.06 <0.02 <0.10 <0.04 <0.04 <0.04 <0.12 01104415 2/12/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104415 3/2/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104415 4/11/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104415 4/27/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104415 5/14/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104415 7/5/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104415 7/16/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104415 8/6/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104415 9/11/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104415 9/25/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104420 12/11/2006 <0.06 <0.02 <0.10 E0.037 <0.04 <0.04 <0.12 01104420 05/15/2007 <0.06 <0.02 <0.1 E0.034 <0.04 <0.04 <0.12
Table 6 75

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

N-(4-

Chlorophenyl)- Neburon Nicosulfuron Norflurazon Oryzalin Oxamyl Picloram 

USGS N’-methylurea (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms Begin station (micrograms per per liter) per liter) per liter) per liter) per liter) per liter) date number liter)

P61692 P49294 P50364 P49293 P49292 P38866 P49291

01104430 12/12/2006 <0.06 <0.02 <0.10 <0.04 <0.04 <0.04 <0.1201104430 05/15/2007 <0.06 <0.02 <0.1 E0.005 <0.04 <0.04 <0.12

01104430 01/31/2008 -- -- -- -- -- -- --

01104433 12/01/2006 <0.06 <0.02 <0.10 <0.04 <0.04 <0.04 <0.1201104433 12/12/2006 <0.06 <0.02 <0.10 <0.04 <0.04 <0.04 <0.1201104433 02/12/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104433 03/02/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104433 04/11/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104433 05/14/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104433 05/16/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104433 07/04/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104433 07/16/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104433 08/06/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104433 09/11/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104433 09/25/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104453 12/12/2006 <0.06 <0.02 <0.10 <0.04 <0.04 <0.04 <0.1201104453 05/15/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104455 12/01/2006 <0.06 <0.02 <0.10 0.17 <0.04 <0.04 <0.12

01104455 12/12/2006 <0.06 <0.02 <0.10 E0.100 <0.04 <0.04 <0.12

01104455 01/08/2007 <0.06 <0.02 <0.1 E0.078 <0.04 <0.04 <0.12
76 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms] N-(4- Chlorophenyl)- Neburon Nicosulfuron Norflurazon Oryzalin Oxamyl Picloram USGS N’-methylurea (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms Begin station (micrograms per per liter) per liter) per liter) per liter) per liter) per liter) date number liter) P61692 P49294 P50364 P49293 P49292 P38866 P49291 01104455 02/12/2007 <0.06 <0.02 <0.1 0.09 <0.04 <0.04 <0.12 01104455 03/02/2007 <0.06 <0.02 <0.1 0.10 <0.04 <0.04 <0.12 01104455 03/11/2007 <0.06 <0.02 <0.1 0.09 <0.04 <0.04 <0.12 01104455 04/11/2007 <0.06 <0.02 <0.1 0.16 <0.04 <0.04 <0.12 01104455 04/27/2007 <0.06 <0.02 <0.1 0.08 <0.04 <0.04 <0.12 01104455 05/14/2007 <0.06 <0.02 <0.1 0.10 <0.04 <0.04 <0.12 01104455 05/16/2007 <0.06 <0.02 <0.1 E0.016 <0.04 <0.04 <0.12 01104455 07/04/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104455 07/16/2007 <0.06 <0.02 <0.1 0.06 <0.04 <0.04 <0.12 01104455 08/06/2007 <0.06 <0.02 <0.1 E0.003 <0.04 <0.04 <0.12 01104455 09/11/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104455 09/25/2007 <0.06 <0.02 <0.1 E0.040 <0.04 <0.04 <0.12 01104460 12/01/2006 <0.06 <0.02 <0.10 E0.005 <0.04 <0.04 <0.12 01104460 12/12/2006 <0.06 <0.02 <0.10 <0.04 <0.04 <0.04 <0.12 01104460 02/12/2007 <0.06 <0.02 <0.1 E0.004 <0.04 <0.04 <0.12 01104460 03/02/2007 <0.06 <0.02 <0.1 E0.005 <0.04 <0.04 <0.12 01104460 04/11/2007 <0.06 <0.02 <0.1 E0.004 <0.04 <0.04 <0.12 01104460 04/27/2007 <0.06 <0.02 <0.1 E0.004 <0.04 <0.04 <0.12 01104460 05/15/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104460 07/05/2007 <0.06 <0.02 <0.1 E0.004 <0.04 <0.04 <0.12
Table 6 77

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

N-(4-

Chlorophenyl)- Neburon Nicosulfuron Norflurazon Oryzalin Oxamyl Picloram 

USGS N’-methylurea (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms Begin station (micrograms per per liter) per liter) per liter) per liter) per liter) per liter) date number liter)

P61692 P49294 P50364 P49293 P49292 P38866 P49291

01104460 07/16/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104460 08/06/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104460 09/11/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104460 09/25/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104475 12/01/2006 <0.06 <0.02 <0.10 <0.04 <0.04 <0.04 <0.1201104475 12/12/2006 <0.06 <0.02 <0.10 <0.04 <0.04 <0.04 <0.1201104475 02/12/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104475 03/02/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104475 04/11/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104475 04/27/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104475 05/15/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104475 07/05/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104475 07/16/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104475 08/06/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104475 09/11/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104475 09/25/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104475 05/13/2008 <0.12 <0.02 <0.1 <0.02 <0.04 <0.12 <0.12

422302071083802 12/14/2006 <0.06 <0.02 <0.10 E0.006 <0.04 <0.04 <0.12422302071083802 03/27/2007 <0.06 <0.02 <0.1 E0.003 <0.04 <0.04

422302071083802 08/15/2007 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12422302071083802 05/13/2008 <0.12 <0.02 <0.1 <0.02 <0.04 <0.12 <0.12
78 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

USGS 

station 

number

Begin 

date

Propham 

(micrograms 

per liter)

Propiconazole 

(micrograms 

per liter)

Propoxur 

(micrograms 

per liter)

Siduron 

(micrograms 

per liter)

Sulfometuron 

(micrograms 

per liter)

Tebuthiuron 

(micrograms 

per liter)

Terbacil 

(micrograms 

per liter)

P49236 P50471 P38538 P38548 P50337 P82670 P04032

01104390 12/11/2006 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104390 05/15/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104405 12/11/2006 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104405 05/15/2007 <0.06 <0.06 <0.04 E0.003 <0.06 <0.04 <0.0401104410 12/11/2006 <0.06 <0.06 <0.04 <0.04 E0.047 <0.04 <0.0401104410 05/15/2007 <0.06 <0.06 <0.04 <0.04 E0.009 <0.04 <0.0401104415 12/1/2006 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104415 12/12/2006 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104415 2/12/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104415 3/2/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104415 4/11/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104415 4/27/2007 <0.06 <0.06 <0.04 E0.019 <0.06 <0.04 <0.0401104415 5/14/2007 <0.06 <0.06 <0.04 E0.015 <0.06 <0.04 <0.0401104415 7/5/2007 <0.06 <0.06 <0.04 0.043 <0.06 <0.04 <0.0401104415 7/16/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104415 8/6/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104415 9/11/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104415 9/25/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104420 12/11/2006 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104420 05/15/2007 <0.06 <0.06 <0.04 E0.034 <0.06 <0.04 <0.04
Table 6 79

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Propham Propiconazole Propoxur Siduron Sulfometuron Tebuthiuron Terbacil 

USGS (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms Begin station per liter) per liter) per liter) per liter) per liter) per liter) per liter) date number

P49236 P50471 P38538 P38548 P50337 P82670 P04032

01104430 12/12/2006 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104430 05/15/2007 <0.06 <0.06 <0.04 E0.003 <0.06 <0.04 <0.04

01104430 01/31/2008 -- -- -- -- -- -- --

01104433 12/01/2006 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104433 12/12/2006 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104433 02/12/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104433 03/02/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104433 04/11/2007 <0.06 <0.06 <0.04 E0.006 <0.06 <0.04 <0.04

01104433 05/14/2007 <0.06 <0.06 <0.04 0.10 <0.06 <0.04 <0.04

01104433 05/16/2007 <0.06 <0.06 <0.04 0.11 <0.06 <0.04 <0.04

01104433 07/04/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04

01104433 07/16/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104433 08/06/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104433 09/11/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104433 09/25/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104453 12/12/2006 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104453 05/15/2007 <0.06 <0.06 <0.04 E0.006 <0.06 <0.04 <0.04

01104455 12/01/2006 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04

01104455 12/12/2006 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104455 01/08/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04
80 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms] Propham Propiconazole Propoxur Siduron Sulfometuron Tebuthiuron Terbacil USGS (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms Begin station per liter) per liter) per liter) per liter) per liter) per liter) per liter) date number P49236 P50471 P38538 P38548 P50337 P82670 P04032 01104455 02/12/2007 <0.06 <0.06 <0.04 <0.04 E0.005 <0.04 <0.04 01104455 03/02/2007 <0.06 <0.06 <0.04 <0.04 <0.06 E0.010 <0.04 01104455 03/11/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 01104455 04/11/2007 <0.06 <0.06 <0.04 <0.04 E0.004 E0.003 <0.04 01104455 04/27/2007 <0.06 <0.06 <0.04 0.10 <0.06 <0.04 <0.04 01104455 05/14/2007 <0.06 <0.06 <0.04 <0.04 E0.003 E0.002 <0.04 01104455 05/16/2007 <0.06 <0.06 <0.04 E0.014 <0.06 <0.04 <0.04 01104455 07/04/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 01104455 07/16/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 01104455 08/06/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 01104455 09/11/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 01104455 09/25/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 01104460 12/01/2006 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 01104460 12/12/2006 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 01104460 02/12/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 01104460 03/02/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 01104460 04/11/2007 <0.06 <0.06 <0.04 <0.04 <0.06 E0.0003 <0.04 01104460 04/27/2007 <0.06 <0.06 <0.04 E0.006 <0.06 <0.04 <0.04 01104460 05/15/2007 <0.06 <0.06 <0.04 E0.004 <0.06 <0.04 <0.04 01104460 07/05/2007 <0.06 <0.06 <0.04 E0.040 <0.06 <0.04 <0.04
Table 6 81

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Propham Propiconazole Propoxur Siduron Sulfometuron Tebuthiuron Terbacil 

USGS (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms Begin station per liter) per liter) per liter) per liter) per liter) per liter) per liter) date number

P49236 P50471 P38538 P38548 P50337 P82670 P04032

01104460 07/16/2007 <0.06 <0.06 <0.04 E0.005 <0.06 <0.04 <0.04

01104460 08/06/2007 <0.06 <0.06 <0.04 E0.006 <0.06 <0.04 <0.04

01104460 09/11/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104460 09/25/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104475 12/01/2006 <0.06 E0.044 <0.04 <0.04 <0.06 <0.04 <0.0401104475 12/12/2006 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104475 02/12/2007 <0.06 E0.033 E0.001 E0.023 <0.06 <0.04 <0.0401104475 03/02/2007 <0.06 0.08 <0.04 E0.012 <0.06 <0.04 <0.04

01104475 04/11/2007 <0.06 E0.032 <0.04 E0.009 <0.06 <0.04 <0.0401104475 04/27/2007 <0.06 E0.025 <0.04 E0.018 <0.06 <0.04 <0.0401104475 05/15/2007 <0.06 E0.030 <0.04 E0.005 <0.06 <0.04 <0.0401104475 07/05/2007 <0.06 E0.013 <0.04 E0.003 <0.06 <0.04 <0.0401104475 07/16/2007 <0.06 E0.017 <0.04 E0.003 <0.06 <0.04 <0.0401104475 08/06/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04

01104475 09/11/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104475 09/25/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.0401104475 05/13/2008 <0.04 <0.04 <0.04 <0.02 <0.06 <0.04 <0.04

422302071083802 12/14/2006 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04422302071083802 03/27/2007 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04422302071083802 08/15/2007 <0.06 <0.06 <0.04 E0.004 <0.06 <0.04 <0.04422302071083802 05/13/2008 <0.04 <0.04 <0.04 E0.005 <0.06 <0.04 <0.04
82 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms] USGS station number Begin date Triclopyr (micrograms per liter) Petroleum hydrocarbons, silica gel treated-hexane extractable (milligrams per liter) Suspended sediment, sieve diameter, percent smaller than 0.0625 (millimeters) Suspended sediment concentration ( milligrams per liter) P49235 P62172 P70331 P80154 01104390 12/11/2006 <0.04 -- -- -- 01104390 05/15/2007 <0.04 -- -- -- 01104405 12/11/2006 <0.04 -- -- -- 01104405 05/15/2007 <0.04 -- -- -- 01104410 12/11/2006 <0.04 -- -- -- 01104410 05/15/2007 <0.04 -- -- -- 01104415 12/1/2006 <0.04 -- -- -- 01104415 12/12/2006 <0.04 -- -- -- 01104415 2/12/2007 <0.04 -- -- -- 01104415 3/2/2007 <0.04 -- -- -- 01104415 4/11/2007 <0.04 -- -- -- 01104415 4/27/2007 <0.04 -- -- -- 01104415 5/14/2007 <0.04 -- -- -- 01104415 7/5/2007 <0.04 -- -- -- 01104415 7/16/2007 <0.04 -- -- -- 01104415 8/6/2007 <0.04 -- -- -- 01104415 9/11/2007 <0.04 -- -- -- 01104415 9/25/2007 <0.04 -- -- -- 01104420 12/11/2006 <0.04 -- -- -- 01104420 05/15/2007 <0.04 -- -- --
Table 6 83

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Petroleum hydrocarbons, Suspended sediment, Suspended sediment Triclopyr silica gel treated-hexane sieve diameter, percent USGS concentration Begin (micrograms per liter) extractable smaller than 0.0625 station ( milligrams per liter) date (milligrams per liter) (millimeters) number

P49235 P62172 P70331 P80154

01104430 12/12/2006 <0.04 -- -- --

01104430 05/15/2007 <0.04 -- -- --

01104430 01/31/2008 -- -- -- --01104433 12/01/2006 <0.04 -- -- --

01104433 12/12/2006 <0.04 -- -- --

01104433 02/12/2007 <0.04 -- -- --

01104433 03/02/2007 <0.04 -- -- --

01104433 04/11/2007 <0.04 -- -- --

01104433 05/14/2007 <0.04 -- -- --

01104433 05/16/2007 <0.04 -- -- --

01104433 07/04/2007 <0.04 -- -- --

01104433 07/16/2007 <0.04 -- -- --

01104433 08/06/2007 <0.04 -- -- --

01104433 09/11/2007 <0.04 -- -- --

01104433 09/25/2007 <0.04 -- -- --

01104453 12/12/2006 <0.04 -- -- --

01104453 05/15/2007 <0.04 -- -- --

01104455 12/01/2006 <0.04 -- -- --

01104455 12/12/2006 <0.04 -- -- --

01104455 01/08/2007 <0.04 -- -- --
84 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms] Petroleum hydrocarbons, Suspended sediment, Suspended sediment Triclopyr silica gel treated-hexane sieve diameter, percent USGS concentration Begin (micrograms per liter) extractable smaller than 0.0625 station ( milligrams per liter) date (milligrams per liter) (millimeters) number P49235 P62172 P70331 P80154 01104455 02/12/2007 <0.04 -- -- -- 01104455 03/02/2007 <0.04 6 82 190 01104455 03/11/2007 <0.04 -- 91 29 01104455 04/11/2007 <0.04 -- -- -- 01104455 04/27/2007 <0.04 <2 81 58 01104455 05/14/2007 <0.04 -- -- -- 01104455 05/16/2007 <0.04 5 76 188 01104455 07/04/2007 <0.04 3 70 164 01104455 07/16/2007 <0.04 -- -- -- 01104455 08/06/2007 <0.04 -- 75 106 01104455 09/11/2007 <0.04 3 66 105 01104455 09/25/2007 <0.04 -- -- -- 01104460 12/01/2006 <0.04 -- -- -- 01104460 12/12/2006 <0.04 -- -- -- 01104460 02/12/2007 <0.04 -- -- -- 01104460 03/02/2007 <0.04 -- -- -- 01104460 04/11/2007 <0.04 -- -- -- 01104460 04/27/2007 <0.04 -- -- -- 01104460 05/15/2007 <0.04 -- -- -- 01104460 07/05/2007 <0.04 -- -- --
Table 6 85

Table 6. Physical properties of and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, petroleum hydrocarbons, and suspended sediment in base-flow and stormflow water samples collected in 11 subbasins and for water samples collected from the Fresh Pond intake structure in the Cambridge, Massachusetts, drinking-water source area in water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; shaded areas indicate samples collected during storms]

Petroleum hydrocarbons, Suspended sediment, Suspended sediment Triclopyr silica gel treated-hexane sieve diameter, percent USGS concentration Begin (micrograms per liter) extractable smaller than 0.0625 station ( milligrams per liter) date (milligrams per liter) (millimeters) number

P49235 P62172 P70331 P80154

01104460 07/16/2007 <0.04 -- -- --

01104460 08/06/2007 <0.04 -- -- --

01104460 09/11/2007 <0.04 -- -- --

01104460 09/25/2007 <0.04 -- -- --

01104475 12/01/2006 <0.04 -- -- --

01104475 12/12/2006 <0.04 -- -- --

01104475 02/12/2007 <0.04 -- -- --

01104475 03/02/2007 <0.04 -- -- --

01104475 04/11/2007 <0.04 -- -- --

01104475 04/27/2007 <0.04 -- -- --

01104475 05/15/2007 <0.04 -- -- --

01104475 07/05/2007 <0.04 -- -- --

01104475 07/16/2007 <0.04 -- -- --

01104475 08/06/2007 <0.04 -- -- --

01104475 09/11/2007 <0.04 -- -- --

01104475 09/25/2007 <0.04 -- -- --

01104475 05/13/2008 <0.08 -- -- --

422302071083802 12/14/2006 <0.04 -- -- --

422302071083802 03/27/2007 <0.04 -- -- --

422302071083802 08/15/2007 <0.04 -- -- --

422302071083802 05/13/2008 <0.08 -- -- --
86 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massachu- setts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms] USGS station number Sample type Begin date Begin time End date End time Discharge, instantaneous (millions of gallons per day) Turbidity, (NTRU) Dissolved oxygen (milligrams per liter) pH, field (standard units) Specific conductance, laboratory (μS/cm) P50051 P63676 P00300 P00400 P90095 USGS-MA-LAB Blank water 6/28/2006 1430 -- -- -- -- -- 6.8 3 01104455 MFB 20070411 0810 -- -- -- 0.2 -- 5.9 4 01104415 AFB 20070716 1131 -- -- -- 0.3 -- 6.3 3 01104415 BFS 20070411 0710 -- -- 0.77 2.3 11.3 7.1 1,490 01104415 BFR 20070411 0711 -- -- 0.77 2.3 11.3 7.1 1,530 01104433 BFS 20070514 1330 -- -- 0.15 2.2 13.2 7.3 1,690 01104433 BFR 20070514 1331 -- -- 0.15 2.2 -- 7.3 1,680 01104433 ACR 20070514 1332 -- -- 0.15 2.6 -- 7.3 1,690 01104455 SFS 20061201 1617 20061202 939 -- 21 -- 7 342 01104455 SFR 20061201 1616 20061202 938 -- 24 -- 7 342 01104455 BFS 20070514 1250 -- -- 0.46 1 9.6 7 1,180 01104455 ACR 20070514 1251 -- -- 0.46 -- -- 7 -- 01104460 SFS 20070427 0606 20070429 526 -- 2.1 -- 7.3 391 01104460 SFR 20070427 0607 20070429 526 -- 2.5 -- 7.3 392 01104460 BFS 20070515 1100 -- -- 31 2.1 8.5 6.9 451 01104460 BFR 20070515 1101 -- -- 31 2.2 -- 6.9 452 01104475 BFS 20061212 1345 -- -- 1 2 12.6 7.7 248 01104475 BFR 20061212 1346 -- -- 1 3.8 12.6 7.7 247 01104475 BFS 20070411 0930 -- -- 1.9 2.7 12.5 7.5 278 01104475 BFR 20070411 0931 -- -- 1.9 2.7 12.5 7.5 282
Table 9 87

Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massachusetts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms]

Discharge, Dissolved Specific 

USGS instantaneous Turbidity, oxygen pH, field conductance, Sample Begin Begin End End station (millions of (NTRU) (milligrams (standard units) laboratory type date time date time number gallons per day) per liter) (μS/cm)

P50051 P63676 P00300 P00400 P90095

01104455 BFS 20070911 1308 -- -- -- -- -- -- --

01104455 MS 20070911 1309 -- -- -- -- -- -- --

01104455 MSR 20070911 1310 -- -- -- -- -- -- --

01104460 SFS 20070911 1155 20070913 529 -- -- -- -- --

01104460 MS 20070911 1156 -- -- -- -- -- -- --

01104460 MSR 20070911 1157 -- -- -- -- -- -- --

01104475 BFS 20080513 1230 -- -- -- -- -- -- --

01104475 MS 20080513 1231 -- -- -- -- -- -- --

422302071083802 -- 20080513 1100 -- -- -- -- -- -- --

422302071083802 MS 20080513 1101 -- -- -- -- -- -- --
88 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massachu- setts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms] USGS station number Begin date Specific conductance, field, μS/cm Temperature, water degrees Celsius Calcium, water, filtered (milligrams per liter) Sodium, water, filtered (milligrams per liter) Chloride, water, filtered (milligrams per liter) Sulfate, water, filtered (milligrams per liter) Total nitrogen, unfiltered (milligrams per liter) P00095 P00010 P00915 P00930 P00940 P00945 P62855 USGS-MA-LAB 6/28/2006 0.2 -- <0.02 <0.20 <0.20 <0.18 <0.06 01104455 20070411 0.9 -- E0.01 E0.10 <0.12 <0.18 <0.06 01104415 20070716 2 -- 0.07 0.25 E0.11 <0.18 <0.06 01104415 20070411 1480 3.3 39.4 227 397 25.3 1.79 01104415 20070411 1480 3.3 39.8 230 411 25.5 1.81 01104433 20070514 1800 18 65.1 234 459 25.1 1.47 01104433 20070514 1800 -- 63.8 230 460 25.4 1.46 01104433 20070514 1800 -- 65.2 230 460 25.3 1.44 01104455 20061201 337 -- 12.4 46.4 74.8 12.2 1.33 01104455 20061201 338 -- 12.2 46.1 75.4 12.3 1.25 01104455 20070514 1280 11.3 38.1 164 307 28.1 2.13 01104455 20070514 1280 -- -- -- -- -- -- 01104460 20070427 383 -- 15.2 50.8 92.6 11.9 0.71 01104460 20070427 383 -- 15.4 50.6 93 12 0.75 01104460 20070515 450 14.7 18.8 57.7 105 12.3 0.83 01104460 20070515 450 -- 19.5 59.8 105 12.4 0.85 01104475 20061212 243 6.1 16.6 23.4 35.7 19.8 1.99 01104475 20061212 243 6.1 16.8 23.8 35.5 19.7 1.95 01104475 20070411 277 5.8 16.4 28.6 49.4 17.8 1.75 01104475 20070411 277 5.8 16.7 29.2 47.8 17.9 1.66
Table 9 89

Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massachusetts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms]

Specific Calcium, water, Sodium, water, Chloride, water, Sulfate, water, Total nitrogen, Temperature, conductance, filtered filtered filtered filtered unfiltered USGS water Begin field, (milligrams (milligrams (milligrams (milligrams (milligrams station degrees Celsius date μS/cm per liter) per liter) per liter) per liter) per liter) number

P00095 P00010 P00915 P00930 P00940 P00945 P62855

01104455 20070911 65 -- -- -- -- -- --

01104455 20070911 65 -- -- -- -- -- --01104455 20070911 65 -- -- -- -- -- --01104460 20070911 578 -- -- -- -- -- --01104460 20070911 578 -- -- -- -- -- --01104460 20070911 578 -- -- -- -- -- --01104475 20080513 335 -- -- -- -- -- --01104475 20080513 335 -- -- -- -- -- --422302071083802 20080513 500 -- -- -- -- -- --422302071083802 20080513 500 -- -- -- -- -- --
90 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massa- chusetts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms] USGS station number Begin date Phosphorus, unfiltered (milligrams per liter) 2,4,5-T, surrogate (percent recovery) 2,4-D methyl ester (micrograms per liter) 2,4-D (micrograms per liter) 2,4-DB (micrograms per liter) 2-Chloro-4- isopropylamino-6- amino-s-triazine (micrograms per liter) 2-Chloro-6- ethylamino-4- amino-s-triazine (micrograms per liter) P00665 P99958 P50470 P39732 P38746 P04040 P04038 USGS-MA-LAB 6/28/2006 <0.004 -- <0.19 <0.038 <0.020 <0.028 <0.08 01104455 20070411 <0.008 71.3 <0.2 <0.04 <0.02 <0.02 <0.08 01104415 20070716 <0.008 75.1 <0.2 <0.04 <0.02 <0.02 <0.08 01104415 20070411 E0.008 68.2 <0.2 <0.04 <0.02 <0.02 <0.08 01104415 20070411 E0.006 66.7 <0.2 <0.04 <0.02 <0.02 <0.08 01104433 20070514 0.022 76.9 <0.2 <0.04 <0.02 <0.02 <0.08 01104433 20070514 0.023 82.2 <0.2 <0.04 <0.02 <0.02 <0.08 01104433 20070514 0.022 69.2 <0.2 <0.04 <0.02 <0.02 <0.08 01104455 20061201 0.12 58.5 <0.2 <0.04 <0.02 <0.02 <0.08 01104455 20061201 0.1 66.2 <0.2 <0.04 <0.02 <0.02 <0.08 01104455 20070514 0.011 75.6 <0.2 <0.04 <0.02 <0.02 E0.01 01104455 20070514 -- 79.9 <0.2 <0.04 <0.02 <0.02 E0.01 01104460 20070427 0.02 62.7 <0.2 <0.04 <0.02 <0.02 <0.08 01104460 20070427 0.019 59.7 <0.2 <0.04 <0.02 <0.02 <0.08 01104460 20070515 0.023 68.5 <0.2 <0.04 <0.02 <0.02 <0.08 01104460 20070515 0.022 62.2 <0.2 <0.04 <0.02 <0.02 <0.08 01104475 20061212 0.013 74 <0.2 <0.04 <0.02 <0.02 <0.08 01104475 20061212 0.013 E59.3 <0.2 <0.04 <0.02 <0.02 <0.08 01104475 20070411 0.012 65 <0.2 <0.04 <0.02 <0.02 <0.08

01104475 20070411 0.013 66.9 <0.2 <0.04 <0.02 <0.02 <0.08
Table 9 91

Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massachusetts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms]

2-Chloro-4- 2-Chloro-6- Phosphorus, 2,4,5-T, 2,4-D methyl ester 2,4-D 2,4-DB isopropylamino-6- ethylamino-4- unfiltered surrogate USGS (micrograms (micrograms (micrograms amino-s-triazine amino-s-triazine Begin (milligrams (percent station per liter) per liter) per liter) (micrograms (micrograms date per liter) recovery) number per liter) per liter)

P00665 P99958 P50470 P39732 P38746 P04040 P04038

01104455 20070911 -- 62 <0.2 E0.189 <0.02 <0.02 <0.08

01104455 20070911 -- 63 <0.2 E0.454 0.102 <0.02 <0.0801104455 20070911 -- 51.9 <0.2 E0.401 0.077 <0.02 <0.0801104460 20070911 -- 86.1 <0.2 <0.04 <0.02 <0.02 <0.0801104460 20070911 -- 82.7 E0.109 E0.323 0.154 0.043 0.0901104460 20070911 -- 84.9 E0.108 E0.344 0.153 0.043 0.0901104475 20080513 -- 84.9 <0.04 <0.02 <0.02 <0.06 <0.0801104475 20080513 -- 87.2 <0.04 0.215 0.157 0.105 E0.13422302071083802 20080513 -- 90.6 <0.04 <0.02 <0.02 <0.06 <0.08422302071083802 20080513 -- 86.1 <0.04 0.222 0.159 0.103 E0.13
92 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massa- chusetts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms] USGS station number Begin date 2-Hydroxy-4- isopropylamino- 6-ethylamino- s-triazine (micrograms per liter) 3-Hydroxy carbofuran (micrograms per liter) Acifluorfen, water, recoverable (micrograms per liter) Aldicarb sulfone (micrograms per liter) Aldicarb sulfoxide (micrograms per liter) Aldicarb (micrograms per liter) Atrazine (micrograms per liter) P50355 P49308 P49315 P49313 P49314 P49312 P39632 USGS-MA-LAB 6/28/2006 <0.032 <0.008 <0.028 <0.018 <0.10 <0.15 <0.008 01104455 20070411 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104415 20070716 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104415 20070411 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104415 20070411 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104433 20070514 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104433 20070514 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104433 20070514 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104455 20061201 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104455 20061201 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104455 20070514 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 E0.001 01104455 20070514 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 E0.002 01104460 20070427 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104460 20070427 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104460 20070515 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 E0.003 01104460 20070515 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104475 20061212 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104475 20061212 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04 01104475 20070411 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04

01104475 20070411 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04
Table 9 93

Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massachusetts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms]

2-Hydroxy-4-

isopropylamino- 3-Hydroxy Acifluorfen, water, Aldicarb Aldicarb sulfone Aldicarb Atrazine 6-ethylamino- carbofuran recoverable sulfoxide USGS (micrograms (micrograms (micrograms Begin s-triazine (micrograms (micrograms (micrograms station per liter) per liter) per liter) date (micrograms per liter) per liter) per liter) number per liter)

P50355 P49308 P49315 P49313 P49314 P49312 P39632

01104455 20070911 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.04

01104455 20070911 <0.08 <0.02 0.066 <0.08 0.081 E0.04 0.06801104455 20070911 <0.08 <0.02 E0.024 <0.08 0.062 E0.03 0.06201104460 20070911 <0.08 <0.02 <0.06 <0.08 <0.04 <0.04 <0.0401104460 20070911 <0.08 0.08 0.148 0.024 0.108 E0.05 0.12201104460 20070911 <0.08 0.081 0.128 0.028 0.109 E0.05 0.10101104475 20080513 <0.04 <0.04 <0.04 <0.08 <0.06 <0.12 <0.0401104475 20080513 0.216 0.128 0.078 E0.033 E0.136 E0.02 0.157422302071083802 20080513 <0.04 <0.04 <0.04 <0.08 <0.06 <0.12 <0.04422302071083802 20080513 0.225 0.125 0.094 E0.034 E0.179 E0.02 0.155
94 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massa- chusetts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms] USGS station number Begin date Barban, surrogate (percent recovery) Bendiocarb (micrograms per liter) Benomyl (micrograms per liter) Bensulfuron- methyl (micrograms per liter) Bentazon (micrograms per liter) Bromacil (micrograms per liter) Bromoxynil (micrograms per liter) P90640 P50299 P50300 P61693 P38711 P04029 P49311 USGS-MA-LAB 6/28/2006 -- <0.080 <0.022 <0.018 <0.024 <0.018 <0.044 01104455 20070411 84.9 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12 01104415 20070716 85.5 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12 01104415 20070411 88.4 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12 01104415 20070411 87.5 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12 01104433 20070514 69 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12 01104433 20070514 70.3 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12 01104433 20070514 67 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12 01104455 20061201 90.4 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12 01104455 20061201 79.1 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12 01104455 20070514 82.8 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12 01104455 20070514 80.9 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12 01104460 20070427 80.5 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12 01104460 20070427 78.7 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12 01104460 20070515 88.4 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12 01104460 20070515 82.6 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12 01104475 20061212 86.4 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12 01104475 20061212 84 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12 01104475 20070411 76.7 <0.04 E0.004 <0.06 <0.02 <0.04 <0.12 01104475 20070411 87.3 <0.04 E0.004 <0.06 <0.02 <0.04 <0.12
Table 9 95

Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massachusetts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms]

Barban, Bensulfuron- Bendiocarb Benomyl Bentazon Bromacil Bromoxynil surrogate methyl USGS (micrograms (micrograms (micrograms (micrograms (micrograms Begin (percent (micrograms station per liter) per liter) per liter) per liter) per liter) date recovery) per liter) number

P90640 P50299 P50300 P61693 P38711 P04029 P49311

01104455 20070911 15 <0.04 <0.02 <0.06 <0.02 <0.04 <0.12

01104455 20070911 19.8 0.119 0.201 0.242 0.161 E0.016 E0.10601104455 20070911 12.9 0.11 0.188 0.181 0.12 E0.018 E0.08901104460 20070911 48.1 <0.04 <0.02 <0.06 <0.02 <0.04 <0.1201104460 20070911 47.6 0.123 0.191 0.291 0.218 0.057 E0.12401104460 20070911 41.5 0.129 0.192 0.286 0.225 0.057 E0.12801104475 20080513 74.6 <0.04 E0.017 <0.06 <0.04 <0.02 <0.1201104475 20080513 75.1 0.163 0.126 E0.294 0.218 0.135 E0.189422302071083802 20080513 75.3 <0.04 <0.04 <0.06 <0.04 <0.02 <0.12422302071083802 20080513 72.5 0.157 0.112 E0.287 0.224 0.127 E0.186
96 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey- Massachusetts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms] USGS station number Begin date Caffeine (micrograms (per liter) Caffeine-13C, surrogate (percent recovery) Carbaryl (micrograms (per liter) Carbofuran (micrograms per liter) Chloramben methyl ester (micrograms per liter) Chlorimuron (micrograms per liter) Chlorodiamino- s-triazine (micrograms per liter) P50305 P99959 P49310 P49309 P61188 P50306 P04039 USGS-MA-LAB 6/28/2006 <0.018 -- <0.018 <0.016 <0.024 <0.032 -- 01104455 20070411 <0.04 96.3 <0.02 <0.06 <0.1 <0.08 <0.12 01104415 20070716 <0.04 84.7 <0.02 <0.06 <0.1 <0.08 -- 01104415 20070411 <0.04 60.1 <0.02 <0.06 <0.1 <0.08 <0.12 01104415 20070411 <0.04 60.4 <0.02 <0.06 <0.1 <0.08 <0.12 01104433 20070514 0.122 E53.1 <0.02 <0.06 <0.1 <0.08 -- 01104433 20070514 0.109 E50.4 <0.02 <0.06 <0.1 <0.08 -- 01104433 20070514 0.113 E49.0 <0.02 <0.06 <0.1 <0.08 -- 01104455 20061201 E0.185 E82.6 <0.02 <0.06 <0.1 <0.08 <0.12 01104455 20061201 E0.164 E74.6 <0.02 <0.06 <0.1 <0.08 <0.12 01104455 20070514 <0.04 E60.0 <0.02 <0.06 <0.1 <0.08 -- 01104455 20070514 <0.04 E56.9 <0.02 <0.06 <0.1 <0.08 -- 01104460 20070427 E0.015 60.9 <0.02 <0.06 <0.1 <0.08 <0.12 01104460 20070427 E0.017 63.5 <0.02 <0.06 <0.1 <0.08 <0.12 01104460 20070515 <0.04 43.8 <0.02 <0.06 <0.1 <0.08 -- 01104460 20070515 <0.04 47.5 <0.02 <0.06 <0.1 <0.08 -- 01104475 20061212 <0.04 E68.6 E0.051 <0.06 <0.1 <0.08 <0.12 01104475 20061212 <0.04 E64.2 E0.045 <0.06 <0.1 <0.08 <0.12 01104475 20070411 <0.04 57.4 E0.012 <0.06 <0.1 <0.08 <0.12 01104475 20070411 <0.04 58.7 E0.012 <0.06 <0.1 <0.08 <0.12
Table 9 97

Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological SurveyMassachusetts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms]

Chloramben Chlorodiamino- Caffeine Caffeine-13C, Carbaryl Carbofuran Chlorimuron methyl ester s-triazine USGS (micrograms surrogate (micrograms (micrograms (micrograms Begin (micrograms (micrograms station (per liter) (percent recovery) (per liter) per liter) per liter) date per liter) per liter) number

P50305 P99959 P49310 P49309 P61188 P50306 P04039

01104455 20070911 E0.131 E32.1 <0.02 <0.06 <0.1 <0.08 --

01104455 20070911 E0.217 E25 0.078 0.145 <0.1 E0.117 --01104455 20070911 E0.218 E33 0.072 0.137 <0.1 E0.055 --01104460 20070911 E0.026 E38.8 <0.02 <0.06 <0.1 <0.08 --01104460 20070911 E0.124 E34.7 0.113 0.156 <0.1 E0.208 --01104460 20070911 E0.12 E34.7 0.113 0.169 E0.051 E0.193 --01104475 20080513 <0.06 66.2 <0.04 <0.02 <0.1 <0.08 --01104475 20080513 0.154 67.1 0.163 0.197 0.164 E0.245 --422302071083802 20080513 <0.06 71.1 <0.04 <0.02 <0.1 <0.08 --422302071083802 20080513 0.154 53.4 0.161 0.194 0.195 E0.240 --
98 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massa- chusetts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms] USGS station number Begin date Clopyralid (micrograms per liter) Cycloate (micrograms per liter) Dacthal monoacid, (micrograms per liter) Dicamba (micrograms per liter) Dichlorprop (micrograms per liter) Dinoseb (micrograms per liter) Diphenamid (micrograms per liter) P49305 P04031 P49304 P38442 P49302 P49301 P04033 USGS-MA-LAB 6/28/2006 <0.067 <0.014 <0.028 <0.036 <0.028 <0.038 <0.010 01104455 20070411 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04 01104415 20070716 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04 01104415 20070411 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04 01104415 20070411 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04 01104433 20070514 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04 01104433 20070514 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04 01104433 20070514 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04 01104455 20061201 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04 01104455 20061201 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04 01104455 20070514 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04 01104455 20070514 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04 01104460 20070427 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04 01104460 20070427 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04 01104460 20070515 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04 01104460 20070515 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04 01104475 20061212 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04 01104475 20061212 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04 01104475 20070411 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04 01104475 20070411 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04
Table 9 99

Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massachusetts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms]

Clopyralid Cycloate Dacthal monoacid, Dicamba Dichlorprop Dinoseb Diphenamid 

USGS (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms Begin station per liter) per liter) per liter) per liter) per liter) per liter) per liter) date number

P49305 P04031 P49304 P38442 P49302 P49301 P04033

01104455 20070911 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.04

01104455 20070911 <0.06 0.088 <0.02 <0.08 0.226 0.141 0.15401104455 20070911 <0.06 E0.051 <0.02 <0.08 0.197 0.066 0.14401104460 20070911 <0.06 <0.06 <0.02 <0.08 <0.04 <0.04 <0.0401104460 20070911 <0.06 0.168 0.218 0.118 0.263 0.221 0.19801104460 20070911 <0.06 0.151 0.219 0.097 0.253 0.194 0.19901104475 20080513 <0.06 <0.02 <0.02 <0.04 <0.02 <0.04 <0.0401104475 20080513 -- E0.162 0.202 -- 0.228 0.214 0.217422302071083802 20080513 <0.06 <0.02 <0.02 <0.04 <0.02 <0.04 <0.04422302071083802 20080513 -- E0.157 0.19 -- 0.227 0.215 0.209
100 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massa- chusetts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms] USGS station number Begin date Diuron (micrograms per liter) Fenuron (micrograms per liter) Flumetsulam (micrograms per liter) Fluometuron (micrograms per liter) Imazaquin (micrograms per liter) Imazethapyr (micrograms per liter) Imidacloprid (micrograms per liter) P49300 P49297 P61694 P38811 P50356 P50407 P61695 USGS-MA-LAB 6/28/2006 <0.016 <0.10 <0.040 <0.016 <0.036 <0.038 <0.020 01104455 20070411 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104415 20070716 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104415 20070411 E0.003 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104415 20070411 E0.002 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104433 20070514 E0.027 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104433 20070514 E0.026 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104433 20070514 E0.029 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104455 20061201 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104455 20061201 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104455 20070514 E0.013 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104455 20070514 E0.015 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104460 20070427 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104460 20070427 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104460 20070515 E0.014 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104460 20070515 E0.012 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06 01104475 20061212 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 E00.193 01104475 20061212 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 E00.174 01104475 20070411 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 0.129 01104475 20070411 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 0.134
Table 9 101

Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massachusetts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms]

Diuron Fenuron Flumetsulam Fluometuron Imazaquin Imazethapyr Imidacloprid 

USGS (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms Begin station per liter) per liter) per liter) per liter) per liter) per liter) per liter) date number

P49300 P49297 P61694 P38811 P50356 P50407 P61695

01104455 20070911 <0.04 E0.036 <0.06 <0.04 <0.04 <0.04 <0.06

01104455 20070911 <0.04 0.187 0.099 E0.109 E0.059 0.065 <0.0601104455 20070911 <0.04 0.17 0.093 E0.098 E0.056 0.06 <0.0601104460 20070911 0.008 <0.04 <0.06 <0.04 <0.04 <0.04 <0.0601104460 20070911 0.12 0.176 0.099 0.168 E0.102 0.091 0.12701104460 20070911 0.117 0.179 0.099 0.164 E0.101 0.092 0.12801104475 20080513 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 0.0901104475 20080513 0.197 0.136 E0.174 0.189 E0.190 0.076 0.288422302071083802 20080513 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 <0.06422302071083802 20080513 0.192 0.141 E0.165 0.186 E0.187 0.058 0.172
102 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massachu- setts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms] USGS station number Begin date Linuron (micrograms per liter) 2-methyl-4- chlorophenoxyacetic acid (MCPA) (micrograms per liter) 4-(4-chloro-2- methylphenoxy) butanoic acid (MCPB) (micrograms per liter) Metalaxyl (micrograms per liter) Methiocarb (micrograms per liter) Methomyl (micrograms per liter) Metsulfuron (micrograms per liter) P38478 P38482 P38487 P50359 P38501 P49296 P61697 USGS-MA-LAB 6/28/2006 <0.014 <0.070 <0.10 <0.030 <0.034 <0.070 <0.067 01104455 20070411 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104415 20070716 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104415 20070411 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104415 20070411 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104433 20070514 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104433 20070514 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104433 20070514 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104455 20061201 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104455 20061201 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104455 20070514 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104455 20070514 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104460 20070427 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104460 20070427 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104460 20070515 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104460 20070515 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14 01104475 20061212 <0.04 <0.06 <0.2 E0.028 <0.04 <0.06 <0.14 01104475 20061212 <0.04 <0.06 <0.2 E0.026 <0.04 <0.06 <0.14 01104475 20070411 <0.04 <0.06 <0.2 E0.013 <0.04 <0.06 <0.14

01104475 20070411 <0.04 <0.06 <0.2 E0.013 <0.04 <0.06 <0.14
Table 9 103

Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massachusetts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms]

4-(4-chloro-2- 2-methyl-4- methylphenoxy) Linuron chlorophenoxyacetic Metalaxyl Methiocarb Methomyl Metsulfuron butanoic acid USGS (micrograms acid (MCPA) (micrograms (micrograms (micrograms (micrograms Begin (MCPB) station per liter) (micrograms per liter) per liter) per liter) per liter) date (micrograms number per liter) per liter)

P38478 P38482 P38487 P50359 P38501 P49296 P61697

01104455 20070911 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.14

01104455 20070911 0.098 E0.22 E0.082 0.17 0.11 0.143 E0.14401104455 20070911 0.081 E0.183 E0.059 0.167 0.09 0.137 E0.11901104460 20070911 <0.04 <0.06 <0.2 <0.04 <0.04 <0.06 <0.1401104460 20070911 0.154 E0.225 E0.119 0.199 0.15 0.157 E0.22501104460 20070911 0.149 E0.229 E0.119 0.201 0.149 0.155 E0.21501104475 20080513 <0.02 <0.06 <0.06 E0.015 <0.04 <0.12 <0.1401104475 20080513 0.204 0.222 0.137 0.248 0.19 0.185 E0.209422302071083802 20080513 <0.02 <0.06 <0.06 <0.02 <0.04 <0.12 <0.14422302071083802 20080513 0.198 0.223 0.134 0.225 0.182 0.171 0.201
104 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massa- chusetts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms] USGS station number Begin date N-(4- Chlorophenyl)- N’-methylurea (micrograms per liter) Neburon (micrograms per liter) Nicosulfuron (micrograms per liter) Norflurazon (micrograms per liter) Oryzalin (micrograms per liter) Oxamyl (micrograms per liter) Picloram (micrograms per liter) P61692 P49294 P50364 P49293 P49292 P38866 P49291 USGS-MA-LAB 6/28/2006 <0.036 <0.012 <0.04 <0.020 <0.023 <0.050 <0.032 01104455 20070411 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104415 20070716 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104415 20070411 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104415 20070411 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104433 20070514 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104433 20070514 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104433 20070514 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104455 20061201 <0.06 <0.02 <0.1 0.165 <0.04 <0.04 <0.12 01104455 20061201 <0.06 <0.02 <0.1 0.148 <0.04 <0.04 <0.12 01104455 20070514 <0.06 <0.02 <0.1 0.099 <0.04 <0.04 <0.12 01104455 20070514 <0.06 <0.02 <0.1 0.095 <0.04 <0.04 <0.12 01104460 20070427 <0.06 <0.02 <0.1 E0.004 <0.04 <0.04 <0.12 01104460 20070427 <0.06 <0.02 <0.1 E0.004 <0.04 <0.04 <0.12 01104460 20070515 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104460 20070515 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104475 20061212 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104475 20061212 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104475 20070411 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12 01104475 20070411 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12
Table 9 105

Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massachusetts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms]

N-(4-

Chlorophenyl)- Neburon Nicosulfuron Norflurazon Oryzalin Oxamyl Picloram 

USGS N’-methylurea (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms Begin station (micrograms per liter) per liter) per liter) per liter) per liter) per liter) date number per liter)

P61692 P49294 P50364 P49293 P49292 P38866 P49291

01104455 20070911 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.12

01104455 20070911 0.061 0.099 E0.21 0.104 <0.04 <0.04 E0.11301104455 20070911 E0.056 0.046 E0.23 0.09 <0.04 <0.04 E0.11901104460 20070911 <0.06 <0.02 <0.1 <0.04 <0.04 <0.04 <0.1201104460 20070911 0.077 0.206 E0.33 0.168 0.192 0.123 E0.13901104460 20070911 0.075 0.188 E0.32 0.166 0.172 0.126 E0.13501104475 20080513 <0.12 <0.02 <0.1 <0.02 <0.04 <0.12 <0.1201104475 20080513 0.133 0.174 E0.54 0.208 0.211 E0.139 --422302071083802 20080513 <0.12 <0.02 <0.1 <0.02 <0.04 <0.12 <0.12422302071083802 20080513 0.133 0.182 0.51 0.208 E0.201 E0.169 --
106 Surface-Water, Water-Quality, and Meteorological Data for Cambridge, Massachusetts, Drinking-Water Source Area Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued [USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massachu- setts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms] USGS station number Begin date Propham (micrograms per liter) Propiconazole, (micrograms per liter) Propoxur (micrograms per liter) Siduron (micrograms per liter) Sulfometuron (micrograms per liter) Tebuthiuron (micrograms per liter) Terbacil (micrograms per liter) Triclopyr (micrograms per liter) P49236 P50471 P38538 P38548 P50337 P82670 P04032 P49235 USGS-MA-LAB 6/28/2006 <0.030 <0.010 <0.008 <0.020 <0.090 <0.026 <0.026 <0.026 01104455 20070411 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 01104415 20070716 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 01104415 20070411 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 01104415 20070411 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 01104433 20070514 <0.06 <0.06 <0.04 0.098 <0.06 <0.04 <0.04 <0.04 01104433 20070514 <0.06 <0.06 <0.04 0.099 <0.06 <0.04 <0.04 <0.04 01104433 20070514 <0.06 <0.06 <0.04 0.093 <0.06 <0.04 <0.04 <0.04 01104455 20061201 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 01104455 20061201 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 01104455 20070514 <0.06 <0.06 <0.04 <0.04 E0.003 E0.002 <0.04 <0.04 01104455 20070514 <0.06 <0.06 <0.04 <0.04 E0.003 E0.002 <0.04 <0.04 01104460 20070427 <0.06 <0.06 <0.04 E0.006 <0.06 <0.04 <0.04 <0.04 01104460 20070427 <0.06 <0.06 <0.04 E0.008 <0.06 <0.04 <0.04 <0.04 01104460 20070515 <0.06 <0.06 <0.04 E0.004 <0.06 <0.04 <0.04 <0.04 01104460 20070515 <0.06 <0.06 <0.04 E0.004 <0.06 <0.04 <0.04 <0.04 01104475 20061212 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04 01104475 20061212 <0.06 E0.049 <0.04 E0.034 <0.06 <0.04 <0.04 <0.04 01104475 20070411 <0.06 E0.032 <0.04 E0.009 <0.06 <0.04 <0.04 <0.04 01104475 20070411 <0.06 E0.035 <0.04 E0.011 <0.06 <0.04 <0.04 <0.04
Table 9 107

Table 9. Physical properties and concentrations of dissolved calcium, sodium, chloride, sulfate, total nutrients, polar pesticides and metabolites, in quality-control samples collected in the Cambridge, Massachusetts, drinking-water source area during water years 2007–08.—Continued[USGS, U.S. Geological Survey; P50051, National Water Quality Laboratory parameter code; E, estimated; NTRU, nephelometric turbidity ratio units; USGS-MA LAB, U.S. Geological Survey-Massachusetts Water Science Center laboratory; μS/cm, microsiemens per centimeter at 25 degrees Celsius; <, concentration is less than value shown; --, no data; MFB, manual field blank; AFB, automatic field blank; BFS, base-flow sample; BFR, base-flow replicate sample; ACR, automatic concurrent replicate; SFS, stormflow sample; SFR, stormflow replicate sample; MS, matrix spike; MSR, matrix spike replicate; shades areas indicate samples collected during storms]

Propham Propiconazole, Propoxur Siduron Sulfometuron Tebuthiuron Terbacil Triclopyr 

USGS (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms (micrograms Begin station per liter) per liter) per liter) per liter) per liter) per liter) per liter) per liter) date number

P49236 P50471 P38538 P38548 P50337 P82670 P04032 P49235

01104455 20070911 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04

01104455 20070911 0.095 0.096 E0.133 0.145 0.147 0.071 0.044 0.145

01104455 20070911 0.077 E0.046 E0.121 0.109 0.135 0.069 0.041 0.13101104460 20070911 <0.06 <0.06 <0.04 <0.04 <0.06 <0.04 <0.04 <0.04

01104460 20070911 0.133 0.197 E0.162 0.201 0.185 0.109 0.06 0.201

01104460 20070911 0.127 0.188 E0.163 0.199 0.186 0.105 0.059 0.182

01104475 20080513 <0.04 <0.04 <0.04 <0.02 <0.06 <0.04 <0.04 <0.08

01104475 20080513 0.196 0.187 E0.201 0.228 E0.299 0.172 0.147 0.202

422302071083802 20080513 <0.04 <0.04 <0.04 0.005 <0.06 <0.04 <0.04 <0.08

422302071083802 20080513 0.178 0.185 E0.192 0.225 E0.293 0.169 0.142 0.221
This page has been left blank intentionally.
Prepared by the Pembroke and Raleigh–

Fort Lauderdale Publishing Service Centers.

For more information concerning this report, contact:

Director

U.S. Geological Survey

Massachusetts-Rhode Island Water Science Center

10 Bearfoot Road

Northborough, MA 01532

dc_ma@usgs.gov

or visit our Web site at:

http://ma.water.usgs.gov
Smith—Surface-Water, Water-Quality, and Meteorological Data for the Cambridge, Massachusetts, Drinking-Water Source Area, Water Years 2007–08 —Open-File Report 2011–1077