Prepared in cooperation with the New York City Department of Environmental Protection

Water-Quality Data From an Earthen Dam Site in Southern 

Westchester County, New York, 2015

Data Series 1057

U.S. Department of the Interior

U.S. Geological Survey
1 2

3

Cover. 1. USGS scientist collecting water sample from teflon bailer in Westchester County, NY. 

2. USGS scientists collecting water sample from a low flow sampler in Westchester County, NY.

3. Packaging water samples for shipping in Westchester County, NY.
Water-Quality Data From an Earthen Dam 

Site in Southern Westchester County, 

New York, 2015

By Anthony Chu and Michael L. Noll

Prepared in cooperation with the 

New York City Department of Environmental Protection

Data Series 1057

U.S. Department of the Interior

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

RYAN K. ZINKE, Secretary

U.S. Geological Survey

William H. Werkheiser, Acting Director

U.S. Geological Survey, Reston, Virginia: 2017

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

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Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials 

as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.

Suggested citation:

Chu, Anthony, and Noll, M.L., 2017, Water-quality data from an earthen dam site in southern Westchester County, 

New York, 2015: U.S. Geological Survey Data Series 1057, 83 p., https://doi.org/10.3133/ds1057.

ISSN 2327-0271 (print)

ISSN 2327–638X (online)

ISBN 978-1-4113-4179-1
iii

Acknowledgments

The authors thank Richard Zunino, Will Melendez, and Masud Ahmed of the New York City 

Department of Environmental Protection for their technical assistance and logistical support. 

The authors also thank Michael D. Como from the U.S. Geological Survey for his technical, field, 

and logistical support during sample collection, and Kaitlyn M. Colella, Shawn Fisher, and Irene 

Fisher from the U.S. Geological Survey for their water-quality expertise and their logistical support in streamlining the data collection process.

v

Contents

Acknowledgments........................................................................................................................................iii

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

Introduction.....................................................................................................................................................1

Previous Investigations.................................................................................................................................6

Methods of Water-Quality Sample Collection...........................................................................................6

Data Dissemination........................................................................................................................................6

References Cited............................................................................................................................................7

Figures

1. Map showing Hillview Reservoir study area and selected sites that were 

sampled for water quality, Westchester County, New York, 2015 ........................................2

2. Map showing sites that were sampled for water quality on the southern 

embankment at the Hillview Reservoir, Westchester County, New York, 2015..................3

Tables

1. Site information for A, groundwater wells and B, East Basin, seep A, seep E, 

and manhole outflow at the Hillview Reservoir, Westchester County, New York, 

2006 and 2015.................................................................................................................................4

2. Concentrations of detected constituents in water samples collected from the 

Hillview Reservoir in Westchester County, New York, in 2015............................................10

Conversion Factors

U.S. customary units to International System of Units

Multiply By To obtain

inch (in.) 25.4 millimeter (mm)

foot (ft) 0.3048 meter (m)

gallon (gal) 3.785 liter (L)

gallon (gal) 0.003785 cubic meter (m3

)

gallon (gal) 3.785 cubic decimeter (dm3

)

Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as follows:

°F = (1.8 × °C) + 32.
vi

Datum

Vertical coordinate information is referenced to the National Geodetic Vertical Datum of 1929 

(NGVD 29).

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.

Supplemental Information

Specific conductance is given in microsiemens per centimeter at 25 degrees Celsius (μS/cm at 

25 °C).

Concentrations of chemical constituents in water are given in milligrams per liter (mg/L), 

nanograms per liter (ng/L), or micrograms per liter (μg/L).

Activities for radioactive constituents in water are given in picocuries per liter (pCi/L).

Abbreviations

NWQL National Water Quality Laboratory

NYCDEP New York City Department Environmental Protection

USGS U.S. Geological Survey
Water-Quality Data From an Earthen Dam Site in Southern 

Westchester County, New York, 2015

By Anthony Chu and Michael L. Noll

Abstract

The U.S. Geological Survey, in cooperation with the 

New York City Department of Environmental Protection, 

sampled 37 sites in the reservoir area for nutrients, major 

ions, metals, pesticides and their degradates, volatile organic 

compounds, temperature, pH, and specific conductance 

during fall 2015. Data collection was done to characterize 

the local groundwater-flow system and identify potential 

sources of seeps from the southern embankment at the 

Hillview Reservoir. Water-quality samples were collected in 

accordance with standard U.S. Geological Survey methods 

at 37 sites in and adjacent to Hillview Reservoir. These 

37 sites were sampled to determine (1) baseline water-quality 

conditions of the saturated, low-permeability sediments that 

compose the earthen embankment that surrounds the reservoir, 

(2) water-quality conditions in the southwestern part of the 

study area in relation to the seeps on the embankment, and 

(3) temporal variation of water-quality conditions between 

2006 and 2015 (not included in this report). The physical 

parameters and the results of the water-quality analysis from 

the 37 sites are included in this report and can be downloaded 

from the U.S. Geological Survey National Water Information 

System website.

Introduction

The Hillview Reservoir in southern Westchester County, 

New York, (fig. 1), constructed between 1913 and 1916, contains more than 900 million gallons of water, and maintains 

a hydrostatic head of about 293 feet (ft). Most of New York 

City’s water passes through the Hillview Reservoir facility 

from the Kensico Reservoir, which is fed by the Delaware 

and Catskill aqueducts in upstate New York. Water is chlorinated at the reservoir and is piped from the southern end of 

the reservoir for distribution to users in the city. The partially 

concrete-lined reservoir, which has an area of about 90 acres, 

is equally divided into the East Basin and West Basin by a 

concrete dividing wall, and has operated continuously since 

the first water tunnel was completed in 1917. A 14-ft-diameter 

reinforced-concrete conduit (connecting conduit) hydraulically 

connects downtake chamber 1 to downtake chamber 2 (fig. 2; 

Malcolm Pirnie, Inc. and TAMS Consultants, Inc., 2002).

The embankment surrounding the reservoir is comprised 

of low-permeability glacial clays that were excavated from the 

site and placed on a veneer of low-permeability glacial deposits that overlie crystalline bedrock (Asselstine and Grossman, 

1955; Baskerville, 1982, 1992). The southern embankment 

was subsequently modified by other construction and maintenance projects near the downtake, uptake, and control chambers; connecting shafts; connecting conduits; the reservoir 

dividing wall; and the bypass tunnel.

In fall 2015, the U.S. Geological Survey (USGS), in 

cooperation with the New York City Department of Environmental Protection, sampled 37 sites in the Hillview Reservoir. 

This sampling was done as an extension to a 2006 study to 

further investigate the hydrology of the embankment and 

determine the location of groundwater flows or seeps (table 1). 

This study was designed to determine (1) baseline waterquality conditions of the saturated, low-permeability sediments 

that compose the embankment that surrounds the reservoir 

basins, (2) water-quality conditions in the southwestern part 

of the reservoir in relation to the seeps on the embankment, 

and (3) for a temporal comparison of water-quality conditions 

between 2006 and 2015 (not included in this report).

Groundwater generally flows outward from the reservoir, 

through the low-permeability embankment, toward the surrounding glacial drift. Since 1999, several seeps downslope 

from the East Basin have flowed out from the western side of 

the southern embankment which is the steepest slope in the 

Hillview Reservoir (fig. 2). This report presents the waterquality data collected by the USGS from 37 sites surrounding 

the Hillview Reservoir, including water from the East Basin 

to delineate baseline water-quality conditions in the earthen 

embankment surrounding the reservoir. The USGS sampled 

every available site of the reservoir, and at the reservoir for 

nutrients, major ions, metals, pesticides, pesticide degradates, 

volatile organic compounds, temperature, pH, and specific 

conductance. The water-quality data was collected, in addition 

to other basic hydrologic data, to further investigate the hydrogeologic framework of the southern embankment to determine 

possible sources of seeps.
2 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015

WE–5078

DT–2

105–P

WE–5079

Kensico 

Reservoir

Delaware Aqueduct

Catskill Aqueduct

LONG ISLAND SOUND

Hudson River

WESTCHESTER

COUNTY

BRONX

COUNTY

NASSAU

COUNTY

Map 

Area

ROCKLAND

COUNTY

NEW

JERSEY

NEW YORK

COUNTY

Base derived from Google Earth, 2016 

Transverse Mercator projection

New York State Plane East FIPS 3101

North American Datum of 1983

NEW YORK STATE THRUWAY

KIMBALL AVENUE

HILLVIEW AVENUE

CENTRAL PARK AVENUE

HARDING AVENUE

EXTENT OF FIGURE 2

EAST

BASIN

WEST

BASIN Basin

dividing

wall

BRONX COUNTY

WESTCHESTER COUNTY

73°52'30" 73°52'

40°55'

40°54'30"

Extent of earthen dam 

EXPLANATION

Collection site and identifier

105–P

Building

0 150 300 FEET

0 150 300 METERS

Figure 1. Hillview Reservoir study area and selected sites that were sampled for water quality, Westchester County, 

New York, 2015.
Introduction 3

MR–123P

B–4

TB–9

TB–8

MB–5

B–5A

B–3P

TB–5S

TB–5D

TB–4S

TB–4D

TB–3D

TB–2D

TB–1D TB–1S

TB–15

TB–13

TB–12

TB–10

MB–4W

TB–18D

TB–17S

TB–17D

TB–14D

TB–11B

MR–121

CMB–2W

MR–100P

MR–100PA

Seep E

Manhole 

Outflow

Base derived from Google Earth, 2016 

Transverse Mercator projection

New York State Plane East FIPS 3101

North American Datum of 1983

HILLVIEW AVENUE

KIMBALL AVENUE

EAST

BASIN

Downtake 

chamber 1

Downtake 

chamber 2

Control 

chamber

Chlorination 

building

South connecting conduit

40°54'25"

73°52'10" 73°52'

40°54'30"

Extent of earthen dam 

Building 

EXPLANATION

Collection site and identifier

TB–13

0 50 100 FEET

0 50 100 METERS

Figure 2. Sites that were sampled for water quality on the southern embankment at the Hillview Reservoir, 

Westchester County, New York, 2015. 
4 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015

Table 1. Site information for A, groundwater wells and B, East Basin, seep A, seep E, and manhole outflow at the Hillview Reservoir, 

Westchester County, New York, 2006 and 2015.

[Location of sites sampled in 2015 shown in figure 1; sites not sampled in 2015 are not shown on figures in this report. Latitude and longitude are referenced to 

the North American Datum of 1983. All altitudes are in feet above National Geodetic Vertical Datum of 1929. All depths are in feet below land surface. 

NYSDEC, New York State Department of Environmental Conservation; ID, identifier; USGS, United States Geological Survey; —, no data; NA, not available]

A. Groundwater wells

Local well 

name

NYSDEC 

well ID Latitude Longitude USGS site ID

Measuring-point 

altitude

Landsurface 

altitude

Well 

depth

Sounded 

depth

Screen 

depth

Saturated 

zone 

screened

Water-quality 

sample year

B–77 B77 405408 –735209 405408073520901 189.35 190.00 21 20.7 16–21 — NA

TB–1S WE5051 405428 –735210 405428073520901 302.01 300.69 40 41.8 30–40 Shallow 2006, 2015

TB–1D WE5062 405428 –735210 405428073520902 302.37 300.49 122 72.05 60–70 Deep 2006, 2015

TB–2S WE5058 405427 –735206 405428073520302 300.23 299.73 41 38.45 30–40 Shallow NA

TB–2D WE5072 405427 –735209 405427073520802 300.23 300.16 71 67.45 60–70 Deep 2006, 2015

TB–3S WE5032 405427 –735207 405426073520701 300 300.28 41 39.5 30–40 Shallow NA

TB–3D WE5057 405427 –735207 405426073520702 300.2 300.29 71 62.2 60–70 Deep 2015

TB–4S WE5039 405427 –735205 405427073520401 302.79 300.29 — 43.3 — Shallow 2015

TB–4D WE5045 405427 –735205 405427073520402 302.46 300.05 103 73.1 60–70 Deep 2015

TB–5S WE5024 405426 –735210 405426073521002 300.92 299.17 51 50.9 30–40 Shallow 2006, 2015

TB–5D WE5071 405426 –735210 405426073521004 301.13 299.03 77 76.15 66–76 Deep 2006, 2015

TB–8 WE5040 405425 –735204 405425073524001 276.87 275.14 42 42.1 29–39 Shallow 2015

TB–9 WE5043 405425 –735204 405424073520501 268.63 269.03 41 42.2 30–40 Toe 2015

TB–10 WE5050 405423 –735204 405423073520401 245.44 243.39 41 42.35 20–40 Toe 2015

TB–11B WE5048 405425 –735203 405425073520201 255.85 253.46 31 31.7 20–30 Shallow 2015

TB–12 WE5035 405427 –735203 405424073520301 249.27 247.11 52 32.1 20–30 Toe 2006, 2015

TB–13 WE5033 405424 –735210 405423073521001 220.66 217.97 31 32.4 10–30 Toe 2015

TB–14S WE5028 405422 –735205 405422073520501 241.45 238.9 48 — 20–30 Shallow NA

TB–14D WE5041 405422 –735205 405422073520502 242.97 240.54 50 50.9 29–49 Deep 2015

TB–15 WE5046 405426 –735212 405426073521201 229.77 227.95 33 30.17 12–32 Toe 2006, 2015

TB–16 WE5027 405427 –735210 405427073521001 299.33 299.75 49 48.75 — — NA

TB–17S WE5022 405427 –735211 405426073521001 299 297.32 40 39.9 30–40 Shallow 2006, 2015

TB–17D WE5063 405427 –735211 405426073521003 299.2 297.37 80 79.75 70–80 Deep 2006, 2015

TB–18S WE5056 405428 –735212 405427073521102 277.99 275.32 27 26.8 — Shallow 2006

TB–18D WE5049 405428 –735212 405427073521101 278.02 275.43 60 63.55 50–60 Deep 2006, 2015

MB–1W WE5065 405430 –735212 405430073521101 300.38 300.55 107 77 60–80 — NA

MB–4W WE5069 405430 –735213 405429073521201 288.31 286.82 103 61.5 50–60 Deep 2015

MB–5 WE5070 405428 –735211 405427073521103 299.31 299.67 105 75.25 60–80 Deep 2015

MR–100P WE5042 405428 –735210 405427073520901 300.71 299.02 — 39.45 — Shallow 2015

MR–100PA WE5066 405428 –735208 405427073520902 300.88 298.96 — 61.35 — Deep 2015

MR–121 WE5067 405427 –735202 405427073520102 265.19 262.33 — 20.5 — Shallow 2015

MR–123P WE5068 405428 –735204 405427073520801 302.49 299.73 — 38.9 — Deep 2015

MR–123PA WE5031 405428 –735204 405428073520301 302.06 299.35 — 19.6 — Shallow NA

MR–131 WE5074 405440 –735222 405439073522101 273.2 270.6 33 32.55 — — NA

B–3P WE5026 405427 –735206 405426073520501 299.79 300.53 — 22.55 — Shallow 2006, 2015
Introduction 5

Table 1. Site information for A, groundwater wells and B, East Basin, seep A, seep E, and manhole outflow at the Hillview Reservoir, 

Westchester County, New York, 2006 and 2015.—Continued

[Location of sites sampled in 2015 shown in figure 1; sites not sampled in 2015 are not shown on figures in this report. Latitude and longitude are referenced to 

the North American Datum of 1983. All altitudes are in feet above National Geodetic Vertical Datum of 1929. All depths are in feet below land surface. 

NYSDEC, New York State Department of Environmental Conservation; ID, identifier; USGS, United States Geological Survey; —, no data; NA, not available]

A. Groundwater wells

Local well 

name

NYSDEC 

well ID Latitude Longitude USGS site ID

Measuring-point 

altitude

Landsurface 

altitude

Well 

depth

Sounded 

depth

Screen 

depth

Saturated 

zone 

screened

Water-quality 

sample year

B–4 WE5060 405426 –735206 405425073520502 283.81 282.15 — 35.67 — Shallow 2015

B–5A WE5055 405425 –735206 405425073520501 279.45 277.35 — 35.45 — Shallow 2015

HESF–8S WE5037 405443 –735228 405442073522801 243.88 241.78 10 10.7 5–10 Shallow NA

HESF–8D WE5029 405443 –735228 405442073522701 244.15 241.81 19 19.3 14–19 Deep NA

CMB–2W WE5064 405427 –735205 405426073520502 301.03 299 — 35.4 — Shallow 2015

104–P WE5059 405436 –735217 405436073521702 301.72 300 — 41.3 — — NA

104–PA WE5047 405436 –735217 405436073521701 302.98 300 — 20.7 — — NA

105–P WE5053 405441 –735220 405440073522001 302.65 300.7 — 42.65 — — 2015

106–P WE5061 405444 –735224 405444073522301 301.2 298.9 — 42.4 — — NA

106–PA WE5054 405444 –735224 405444073522401 301.33 296.6 — 42.62 — — NA

109–P WE5073 405454 –735223 405454073522201 303.1 300.1 — 34.75 — — NA

110–P WE5034 405458 –735220 405458073521901 303.4 302.1 — 32.65 — — NA

111 — 405502 –735215 — — — — — — — NA

X WE5021 405459 –735209 405458073520901 302.1 299.9 — 38.35 — — NA

Y–PA WE5030 405454 –735207 405454073520701 302.63 300 — 21.14 — — NA

Y–PD WE5044 405454 –735207 405454073520702 302.45 300 — 42.4 — — NA

Z–PA WE5036 405445 –735203 405445073520201 302.75 300.4 — 19.86 — — NA

Z–PD WE5052 405445 –735203 405445073520202 302.06 299.4 — 46.12 — — NA

PA WE5038 405432 –735159 405432073515801 303.17 300.3 — 22.05 — — NA

PD WE5023 405437 –735159 405436073515801 302.76 300.2 — 42.3 — — NA

DT–2 WE5025 405503 –735212 405502073521101 300.9 298.92 — 44.8 — — 2015

WE–5078 WE5078 405441 –735157 405441073515701 290.6 287.6 124 124.2 — — 2015

WE–5079 WE5079 405449 –735201 405449073520001 277.58 274.6 91 91.15 — — 2015

B. East Basin, seep A, seep E, and manhole outflow

Local site name Station name Longitude Latitude USGS site ID Land surface 

alititude

Water-quality 

sample year

East Basin Downtake Chamber 1 –735210 405433 405432073521001 — 2006, 2015

Seep A Hillview Reservoir hillside seep A near 

Yonkers, New York

–735210 405427 405426073521101 255.3 2006

Seep E Hillview Reservoir hillside seep E near 

Yonkers, New York

–735210 405426 405425073521101 221.6 2006, 2015

Manhole outflow Manhole outflow near stone wall –735211 405425 405425073521102 — 2015

—Continued
6 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015

Previous Investigations

In 2001, the New York City Department of Environmental 

Protection (NYCDEP) drilled 25 wells at the southern end of 

the reservoir adding to the 32 wells previously installed around 

the reservoir. The NYCDEP drilled the wells in an effort to 

locate the potential sources of the continuous flowing seep that 

was first observed in 1999 (George Schmitt, New York City 

Department of Environmental Protection, written commun., 

2007). The NYCDEP approach included taking periodic 

depth-to-water measurements and sampling reservoir and 

spring water for major ions (Malcolm Pirnie, Inc. and TAMS 

Consultants, Inc., 2002; Chu and others, 2013). Beginning in 

2005, the U.S. Geological Survey used a multi-disciplinary 

approach to investigate the relevant hydrogeologic 

framework and characterize the local groundwater-flow 

system to determine possible sources of the seeps (Chu and 

others, 2013). In 2006, water quality samples were collected 

from 12 groundwater observation wells, the East Basin at 

downtake chamber 1, and seeps A and E (fig. 2) to provide 

a basic understanding of the hydrologic interconnections of 

the wells and the seeps to the basin. In 2014, the original 

study was extended to further investigate the hydrology of 

the embankment relative to the seeps. During this final phase 

of the project, the water-quality data that are presented in this 

report were collected and analyzed.

Methods of Water-Quality Sample 

Collection

During fall 2015, the USGS sampled 37 sites (every 

site available) using open-top teflon bailers or a submersible 

pump. Thirty-four of the 37 sites that were sampled are 

groundwater wells within the Hillview Reservoir. The other 

three sites were at the East Basin at downtake chamber 1, 

seep E along the stone retaining wall near Hillview Avenue, 

and the discharge site from an outflow pipe within a storm 

manhole along Hillview Avenue (fig. 2). Thirteen sites that 

were originally sampled during 2006 were sampled again in 

2015 for a temporal comparison of water-quality conditions 

within the earthen embankment. The 13 sites that were 

sampled in 2006 and 2015 are TB–1S, TB–1D, TB–2D, 

TB–5S, TB–5D, TB–12, TB–15, TB–17S, TB–17D, TB–18D, 

B–3P, seep E, and the East Basin at downtake chamber 1 

(fig. 2).Water-quality samples were collected in accordance 

with the USGS National Field Manual for the Collection of 

Water-Quality Data (USGS, variously dated). Because many 

of the wells are screened in low permeability deposits where 

water levels are slow to recover after pumping, teflon bailers 

were used (USGS, variously dated) instead of a pump to 

evacuate (purge) the standard three-casing volumes (USGS, 

2006). A submersible pump was used to purge monitoring 

wells TB–1D, TB–2D, TB–5D, TB–8, and TB–9, whereas 

the remaining 29 wells were purged using an open-top bailer. 

The standard three-casing volumes were not purged from 

monitoring wells TB–3D and B–5A because water-level 

recovery from drawdown to approximately 90 percent of 

the original volume in the well could not be achieved within 

a reasonable timeframe (USGS, variously dated). After 

collection, the water-quality samples were chilled and shipped 

overnight to the USGS National Water Quality Laboratory 

(NWQL) in Denver, Colorado, where they were analyzed for 

nutrients (USGS, 2017b), major ions (USGS, 2017c), metals 

(USGS, 2017c), pesticides and their degradates (USGS, 

2017d), and volatile organic compounds (USGS, 2017e).

Replicate samples were collected from an open-top bailer 

at monitoring well TB–15, and from a dedicated East Basin 

sampling tap inside downtake chamber 1 (fig. 2; table 2, in 

back of report). The replicate samples were collected approximately a half-hour after the primary (regular) samples were 

collected to identify variability of the sampling and analysis 

system (USGS, variously dated). A disparity of iron concentration was detected between the primary and replicate samples 

collected at TB–15.

An equipment blank was performed in the field by passing quality-assured (NWQL approved) blank water through 

an open-top bailer for inorganic and organic analyses (USGS, 

1992, variously dated). Filtered and unfiltered samples were 

collected, preserved, and shipped according to the procedures 

of quality control for equipment cleaning outlined in the 

USGS National Field Manual for the Collection of WaterQuality Data (USGS, variously dated). Barium, iron, and 

manganese were detected in the unfiltered blank samples but 

concentrations were well below the concentrations detected 

in the water-quality samples. Temperature, pH, turbidity, and 

specific conductance were recorded in the field for each water 

sample at the time of collection and are listed in table 2 (in 

back of report).

Data Dissemination

The tabulated results of the water-quality analysis and 

the field parameters that were collected during sampling of 

the 37 sites in the 2015 study are shown in table 2. A digital 

version of these data can also be downloaded from the USGS 

National Water Information System website (USGS, 2016).
References Cited 7

References Cited

Asselstine, E.S., and Grossman, I.G., 1955, The groundwater resources of Westchester County, New York, part 1 

of records of wells and test holes: New York State Water 

Power and Control Commission Bulletin GW–35, 79 p., 

3 pls.

Baskerville, C.A., 1982, Adoption of the name Hutchinson 

River Group and its subdivisions in Bronx and Westchester 

Counties, southeastern New York, in Stratigraphic notes, 

1980–1982: U.S. Geological Survey Bulletin 1529–H, 

p. H1–H10. [Also available at https://pubs.er.usgs.gov/

publication/b1529H.]

Baskerville, C.A., 1992, Bedrock and engineering geologic 

maps of Bronx County and parts of New York and Queens 

Counties, New York: U.S. Geological Survey Miscellaneous 

Investigations Series, map I–2003, 2 sheets, scale 1:24,000. 

[Also available at https://pubs.er.usgs.gov/publication/

i2003.]

Chu, Anthony; Stumm, Frederick; Joesten, P.K.; and Noll, 

M.L., 2013, Geophysical and hydrologic analysis of an 

earthen dam site in southern Westchester County, New 

York: U.S. Geological Survey Scientific Investigations 

Report 2012–5247, 64 p. [Also available at http://

pubs.usgs.gov/sir/2012/5247/.]

Malcolm Pirnie, Inc., and TAMS Consultants, Inc., 2002, 

Capital project W–10, Hillview Reservoir—cover, phase I, 

dividing wall stability buttress construction; south embankment monitoring and leakage investigations: U.S. Environmental Protection Agency, 18 p.

U.S. Geological Survey [USGS], 1992, Technology transfer—Availability of equipment blank water for inorganic 

and organic analysis: U.S. Geological Survey National 

Water Quality Laboratory Technical Memorandum 1992.01, 

accessed March 10, 2017, at https://nwql.usgs.gov/tech_

memos/nwql.1992-01.pdf.

U.S. Geological Survey [USGS], 2006, Collection of water 

samples (ver. 2.0): U.S. Geological Survey Techniques of 

Water-Resources Investigations, book 9, chap. A4, accessed 

March 9, 2017, at https://water.usgs.gov/owq/FieldManual/.

U.S. Geological Survey [USGS], 2011, Parameters: U.S. Geological Survey National Water Information System help 

system website, accessed July 25, 2017, at https://

help.waterdata.usgs.gov/codes-and-parameters/parameters.

U.S. Geological Survey [USGS], 2016, Water-quality samples for the Nation, in USGS water data for the nation: 

U.S. Geological Survey National Water Information 

System database, accessed March 23, 2017, at https://

doi.org/10.5066/F7P55KJN.

U.S. Geological Survey [USGS], 2017a, LCMS/MS pesticides 

in filtered water: U.S. Geological Survey National Water 

Quality Lab Catalog Schedule 2437 web page, accessed 

March 10, 2017, at http://wwwnwql.cr.usgs.gov/USGS/

catalog/index.cfm?a=bs&sa=sf&sap=2437.

U.S. Geological Survey [USGS], 2017b, Nutrients: U.S. Geological Survey National Water Quality Lab Catalog 

Schedule 101 web page, accessed March 8, 2017, at 

http://wwwnwql.cr.usgs.gov/USGS/catalog/

index.cfm?a=bs&sa=sf&sap=101.

U.S. Geological Survey [USGS], 2017c, Metals: U.S. Geological Survey National Water Quality Lab Catalog 

Schedule 1294 web page, accessed March 10, 2017, at 

http://wwwnwql.cr.usgs.gov/USGS/catalog/

index.cfm?a=bs&sa=sf&sap=1294.

U.S. Geological Survey [USGS], 2017d, Pesticides and their 

degradates: U.S. Geological Survey National Water Quality 

Lab Catalog Schedule 2437 web page, accessed March 10, 

2017, at https://wwwnwql.cr.usgs.gov/USGS/catalog/

index.cfm?a=bs&sa=s&sap=2437.

U.S. Geological Survey [USGS], 2017e, Volatile organic 

compounds: U.S. Geological Survey National Water Quality 

Lab Catalog Schedule 2020 web page, accessed March 10, 

2017, at http://wwwnwql.cr.usgs.gov/USGS/catalog/

index.cfm?a=bs&sa=sf&sap=2020.

U.S. Geological Survey [USGS], [variously dated], National 

field manual for the collection of water-quality data: 

U.S. Geological Survey Techniques of Water-Resources 

Investigations, book 9, chaps. A1–A10, [variously paged]. 

[Also available at https://water.usgs.gov/owq/FieldManual/.]

Table 2
10 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015. [Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data] Local well name Station name USGS identifier Date Sample start time Dissolved oxygen, water, unfiltered, mg/L pH, water, unfiltered, field, standard units pH, water, unfiltered, laboratory, standard units Specific conductance, water, unfiltered, laboratory, μS/cm at 25 °C Specific conductance, water, unfiltered, μS/cm at 25 °C Temperature, water, °C 00300 00400 00403 90095 00095 00010 105–P WE5053 405440073522001 11/19/2015 0830

—

— 7.6 591

—

—

109–P WE5073 405454073522201 11/19/2015 1000 7.9 7.2 7.2 131 127 13.5B–3P WE5026 405426073520501 10/20/2015 1430 3.7 8.4 8.6 1,070 973 13.7B–4 WE5060 405425073520502 10/20/2015 1330 22.6 7 7.5 600 1,080 12.6B–5A WE5055 405425073520501 11/18/2015 0830 10.7 7.8 7.8 1,750 1,830 12.5CMB–2W WE5064 405426073520502 10/15/2015 0930 30.2 6.9 7.3 2,100 2,110 13.9

DT–2 WE5025 405502073521101 11/17/2015 1200 6.1 7.1 7.9 384 218 12.3Manhole 

outflow

Manhole outflow 

near stone wall

405425073521102 12/10/2015 1600 12.2 7.4 7.7 103 172 12

MB–4W WE5069 405429073521201 10/14/2015 1130 6.6 8.7 8.4 143 140 13.1MB–5 WE5070 405427073521103 10/14/2015 1300 13.9 7 7.6 2,410 2,440 12.6MR–100P WE5042 405427073520901 10/29/2015 1530 3.5 6.8 7.2 3,490 3,440 13.9MR–100PA WE5066 405427073520902 10/29/2015 1600 11.1 8.8 8 131 131 11.7MR–121 WE5067 405427073520102 11/17/2015 1030 7.3 6.8 7.1 666 651 14.3MR–123P WE5068 405427073520801 11/17/2015 1200 7.1 8.9 8.9 366 383 11.5

TB–10 WE5050 405423073520401 10/27/2015 1300 8.3 7.7 7.8 263 285 15

TB–11B WE5048 405425073520201 10/27/2015 0930 10.5 7.4 7.8 675 652 13.3TB–12 WE5035 405424073520301 10/27/2015 1130 8.5 11.5 11 1,100 1,690 14

TB–13 WE5033 405423073521001 11/18/2015 1130 12.9 6.9 7.5 773 1,060 12.8TB–14D WE5041 405422073520502 10/27/2015 1600 9.7 7.1 7.8 451 444 11.8

TB–15 WE5046 405426073521201 11/18/2015 1305 9 6.8 7.2 665 625 13.6

TB–15 WE5046 405426073521201 11/18/2015 1300 9 6.8 7.2 671 625 13.6

TB–17D WE5063 405426073521003 10/8/2015 1000 7 7.6 7.9 1,660 1,300 11.5TB–17S WE5022 405426073521001 10/8/2015 0815 8.8 8.2 8 699 680 13.1

TB–18D WE5049 405427073521101 10/8/2015 1300 7.5 7.4 8 524 812 12.3

TB–1D WE5062 405428073520902 10/7/2015 0900

—

— 7.5 109

—

—
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 11

Local well 

name

Station name USGS identifier Date Sample start time

Dissolved 

oxygen, water, 

unfiltered, 

mg/L

pH, water, 

unfiltered, 

field, 

standard 

units

pH, water, 

unfiltered, 

laboratory, 

standard 

units

Specific 

conductance, 

water, unfiltered, 

laboratory, 

μS/cm at 25 °C

Specific 

conductance, 

water, unfiltered, 

μS/cm at 25 °C

Temperature, 

water, 

°C

00300 00400 00403 90095 00095 00010

TB–1S WE5051 405428073520901 10/7/2015 1500 8.3 7.2 8 1,830 1,840 12TB–2D WE5072 405427073520802 10/7/2015 1045 4.6 6.9 7.6 107 111 15.4TB–3D WE5057 405426073520702 11/17/2015 0930 4.3 7.9 7.8 700 650 11.3TB–4D WE5045 405427073520402 10/21/2015 0930 12.8 8.6 8.6 144 143 11.6TB–4S WE5039 405427073520401 10/20/2015 1130 8.3 7.3 7.6 147 161 11.9TB–5D WE5071 405426073521004 10/7/2015 1315 — — 7.8 2,680 — —TB–5S WE5024 405426073521002 10/7/2015 1615 9.6 8.1 8.3 6,570 6,610 14.5TB–8 WE5040 405425073524001 10/6/2015 1300 10.4 7.3 7.7 130 136 15.8TB–9 WE5043 405424073520501 10/6/2015 1700 7.9 6.9 7.8 638 629 17.1WE–5078 WE5078 405441073515701 12/21/2015 1500 7.2 7.6 8.2 212 213 11WE–5079 WE5079 405449073520001 12/10/2015 1400 4.2 7.9 8.1 208 211 12East Basin Downtake Chamber 1 405432073521001 10/21/2015 1200 12.9 7.9 E7.7 E92 97 15.2East Basin Downtake Chamber 1 405432073521001 10/21/2015 1230 12.9 7.9 E7.7 E92 97 15.2Seep E Hillview Reservoir 

hillside seep E near Yonkers, NY

405425073521101 10/13/2015 1500 11.5 7.1 7.7 340 339 16.8

Equipment 

blank

QA—Teflon bailer — 10/15/2015 1230 — — — — — —

Equipment 

blank

QA—Teflon bailer — 10/15/2015 1231 — — E6.0 <5 — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

12 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Turbidity, water, unfiltered, broad band light source (400- 680 nm), detectors at multiple angles including 90±30 de- grees, ratiometric correction, NTRU Sampler type Type of qual- ity assurance data associ- ated with sample Dissolved solids dried at 180 °C, water, filtered, mg/L Calcium, water, unfiltered, recoverable, mg/L Magnesium, water, unfiltered, recoverable, mg/L Potassium, water, unfiltered, recoverable, mg/L Sodium, water, unfiltered, recoverable, mg/L Acid neutralizing capacity, water, unfiltered, fixed endpoint (pH 4.5) titration, laboratory, mg/L as calcium carbonate Chloride, water, filtered, mg/L 63676 84164 99111 70300 00916 00927 00937 00929 90410 00940 105–P

— (1

) — 328 140 28 3.34 28.8 460 35.3

109–P 10 (1

) — 77 10.1 3.37 0.84 8.96 38.9 13.9

B–3P

— (1

) — 636 40.1 46.1 17.4 258 294 161

B–4 280 (1

) — 352 61.8 22.3 6.98 30.7 115 105

B–5A

— (1

) — 990 110 23.1 4.21 213 180 425

CMB–2W 300 (1

) — 991 148 49.2 4.22 190 310 385

DT–2 16 (1

) — 221 26.9 9.4 1.83 29 64.5 67.7

Manhole 

outflow

11

—

— 67 6.06 1.34 1.27 9.7 22.6 12.6

MB–4W 540 (1

) — 88 14.6 6.82 1.79 8.41 42.6 14.3

MB–5 300 (1

) — 1,380 205 71.3 3.86 190 354 533

MR–100P

— (1

) — 2,340 339 95.7 13.2 255 696 920

MR–100PA 50 (1

) — 97 10.9 3.32 0.934 8.95 37.2 13.6

MR–121

— (1

) — 373 67 24.2 4.76 44 122 125

MR–123P

— (1

) — 216 238 21 6.7 53 501 53.4

TB–10 260 (1

) — 153 4.3 5.61 4.3 53.1 62.3 38

TB–11B

— (1

) — 396 63.6 18.4 1.94 45.8 155 105

TB–12 230 (1

) — 530 126 18.5 7.3 176 465 229

TB–13

— (1

) — 437 75.5 16.8 9.98 64.7 105 138

TB–14D 640 (1

) — 252 11.4 6.21 3.24 76.6 76.5 84.6

TB–15 760 (1

) — 377 44 14.1 2 62.4 79.5 151

TB–15 760 (1

) (3

) 377 43.4 13.5 1.79 61.9 77.5 149

TB–17D

— (1

) — 1,120 75.4 7.31 3.52 164 127 464

TB–17S

— (1

) — 375 110 78.3 25.5 133 160 141

TB–18D 230 (1

) — 326 27.4 7.09 1.2 69.8 93.3 112

TB–1D

— (2

) — 67 7.09 1.82 0.825 10.5 23.6 13.7
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 13

Local well 

name

Turbidity, water, unfiltered, 

broad band light source (400-

680 nm), detectors at multiple 

angles including 90±30 degrees, ratiometric correction, 

NTRU

Sampler 

type

Type of quality assurance 

data associated with 

sample

Dissolved 

solids dried at 

180 °C, water, 

filtered, 

mg/L

Calcium, 

water, 

unfiltered, 

recoverable, 

mg/L

Magnesium, 

water, 

unfiltered, 

recoverable, 

mg/L

Potassium, 

water, 

unfiltered, 

recoverable, 

mg/L

Sodium, 

water, 

unfiltered, 

recoverable, 

mg/L

Acid neutralizing 

capacity, water, unfiltered, 

fixed endpoint (pH 4.5) 

titration, laboratory, 

mg/L as calcium carbonate

Chloride, 

water, 

filtered, 

mg/L

63676 84164 99111 70300 00916 00927 00937 00929 90410 00940

TB–1S 330 (1) — 1,020 153 75.9 3.27 102 348 396TB–2D 240 (2) — 61 7.02 1.97 1.02 11.4 23.1 13.6TB–3D 320 (1) — 490 135 15.5 7.41 148 596 43.1TB–4D 820 (1) — 94 27.5 10.6 2.8 5.03 71.7 9.96TB–4S — (1) — 86 28.2 25.1 11.6 10.9 59.7 14.3TB–5D — (2) — 1,550 101 12.8 2.74 449 147 647TB–5S 590 (1) — 3,680 120 49.6 46.3 1,290 518 1,620TB–8 470 (2) — 79 11.1 5.66 1.33 9.21 34.2 15TB–9 — (2) — 374 89.1 46.7 13.9 34 139 103WE–5078 300 (1) — 135 24.5 9.07 3.29 4.16 89.9 5.88WE–5079 15 (1) — 121 23.2 9.63 2.6 4.33 83.7 7.39East Basin 2 — — 48 5.85 1.22 0.533 10 19.1 12.4East Basin 2 — (3) 53 6 1.23 0.507 10.3 19.1 12.4Seep E 1.5 — — 196 19.5 2.95 2.68 43.7 63.1 58.9Equipment 

blank

— — — — — — — — — —

Equipment 

blank

— — — <20 0.021 <0.010 <0.020 <0.06 <4.0 <0.02
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

14 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Fluoride, water, filtered, mg/L Silica, water, filtered, mg/L as SiO2 Sulfate, water, filtered, mg/L Ammonia, water, filtered, mg/L as nitrogen Nitrate plus nitrite, water, filtered, mg/L as nitrogen Nitrite, water, filtered, mg/L as nitrogen Orthophosphate, water, filtered, mg/L as phos- phorus Barium, water, unfiltered, recoverable, μg/L Cadmium, water, unfiltered, μg/L Chromium, water, unfiltered, recoverable, μg/L 00950 00955 00945 00608 00631 00613 00671 01007 01027 01034 105–P 0.12 14.4 3 0.1 0.07 0.015 0.017 143 0.114 10.6 109–P 0.68 7.98 3.66 <0.01 0.175 <0.001 0.024 8.57 <0.030 1.7 B–3P 0.38 7.15 13.3 0.07 0.403 <0.001 0.015 584 2.22 196 B–4 0.17 13.5 20.3 0.03 0.292 0.068 0.719 260 0.14 95.4 B–5A 0.09 17.7 21.3 <0.08 0.695 0.002 0.015 60.9 0.127 7 CMB–2W 0.18 21.6 18.4 <0.01 0.214 0.002 0.023 182 0.079 14.7 DT–2 0.17 21 7.51 <0.01 0.269 0.001 0.034 34.2 0.051 3.8 Manhole outflow 0.68 2.33 3.93 0.99 0.113 0.002 0.238 10.8 <0.030 <0.40 MB–4W 0.18 <0.018 5.4 <0.01 0.291 <0.001 0.029 69.2 0.041 19 MB–5 0.11 14.5 49.2 0.11 <0.040 0.007 0.014 177 0.228 5.7 MR–100P 0.09 15.1 24.3 0.05 0.062 0.015 <0.004 2,320 7.22 237 MR–100PA 0.72 11.6 3.91 <0.01 0.322 <0.001 0.04 17.6 0.138 5 MR–121 0.07 10.5 19.2 <0.01 0.463 <0.001 0.014 286 0.561 87.3 MR–123P 0.4 6.97 8.79 0.04 0.062 0.005 0.116 623 0.721 148 TB–10 0.69 7.5 6.72 <0.01 0.083 <0.001 0.059 140 0.071 30.6 TB–11B 0.1 18.9 10.1 <0.01 2.2 0.001 0.015 114 0.041 14.8 TB–12 0.33 17.6 12.4 0.03 0.382 0.052 0.005 410 0.303 301 TB–13 0.27 10.3 39.1 <0.03 0.533 <0.001 0.055 182 0.291 32.8 TB–14D 0.39 13.2 9.89 <0.01 0.204 <0.001 0.006 110 0.05 21.9

TB–15 0.11 8.43 17.2 0.07 0.266 <0.001 <0.004 128 0.126 8.2TB–15 0.1 8.31 17.6 0.04 0.321 <0.001 <0.004 64.9 <0.030 4TB–17D 0.3 8.53 49.8 0.03 0.083 <0.001 0.054 198 0.037 0.83TB–17S 1.22 6.71 15.4 <0.01 0.47 <0.001 0.164 2,160 3.1 1,380TB–18D 0.39 10.9 13.1 0.02 0.301 <0.001 0.034 52.4 0.037 6TB–1D 0.74 3.69 4.28 <0.01 0.328 <0.001 0.011 8.48 <0.030 1.2
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 15

Local well 

name

Fluoride, 

water, filtered, 

mg/L

Silica, 

water, filtered, 

mg/L as SiO2

Sulfate, 

water, filtered, 

mg/L

Ammonia, 

water, filtered, 

mg/L as nitrogen

Nitrate plus nitrite, 

water, filtered, 

mg/L as nitrogen

Nitrite, 

water, filtered, 

mg/L as nitrogen

Orthophosphate, 

water, filtered, 

mg/L as phosphorus

Barium, 

water, 

unfiltered, 

recoverable, 

μg/L

Cadmium, 

water, 

unfiltered, 

μg/L

Chromium, 

water, 

unfiltered, 

recoverable, 

μg/L

00950 00955 00945 00608 00631 00613 00671 01007 01027 01034

TB–1S 0.09 18.9 8.86 0.1 0.079 0.003 0.024 224 0.057 7.5TB–2D 0.79 4.78 4.01 0.05 0.333 <0.001 0.027 17.3 <0.030 5.5TB–3D 0.31 10.5 14.5 0.72 0.05 0.006 1.08 200 1.55 57.9TB–4D 0.16 19 5.15 <0.01 0.282 0.002 0.029 165 0.112 35.9TB–4S 0.52 5.39 4.33 <0.01 0.315 <0.001 0.037 717 0.353 191TB–5D 0.21 7.98 21.3 0.13 0.127 0.003 0.039 155 <0.060 4.6TB–5S 0.32 15.2 45.7 0.01 1.23 <0.001 0.461 1,390 2.24 8,480TB–8 0.12 12.7 4.27 <0.01 0.362 <0.001 0.014 48.4 0.044 17.3TB–9 0.08 13.4 23 0.01 2.26 0.001 0.02 835 0.991 248WE–5078 0.15 16.1 11.1 <0.01 <0.040 0.001 0.011 10.3 0.056 0.71WE–5079 0.14 15.9 11.4 <0.01 0.044 0.002 0.065 38.2 0.035 0.78East Basin 0.65 2.11 3.63 <0.01 0.121 <0.001 <0.004 14.8 <0.030 <0.40East Basin 0.64 1.98 3.63 <0.01 0.127 <0.001 <0.004 15 <0.030 <0.40Seep E 0.67 5.15 6.74 <0.01 0.073 0.001 0.012 20.9 <0.030 <0.40Equipment 

blank

— — — — — — — — — —

Equipment 

blank

<0.01 <0.018 <0.02 <0.01 <0.040 <0.001 <0.004 0.5 <0.030 <0.40
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

16 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Copper, water, unfiltered, recoverable, μg/L Iron, water, filtered, μg/L Iron, water, unfiltered, recoverable, μg/L Lead, water, unfiltered, recoverable, μg/L Manganese, water, filtered, μg/L Manganese, water, unfiltered, recoverable, μg/L Mercury, water, unfiltered, recoverable, μg/L Silver, water, unfiltered, recoverable, μg/L Zinc, water, unfiltered, recoverable, μg/L Arsenic, water, unfiltered, μg/L Selenium, water, unfiltered, μg/L 01042 01046 01045 01051 01056 01055 71900 01077 01092 01002 01147 105–P 18.4 4.3 4,730 36.5 293 11,700 0.037 0.036 62.1 3.5 0.264 109–P 4.2 8.6 310 0.61 2.33 14.8 <0.005 <0.030 13.2 0.24 <0.100 B–3P 694 328 134,000 179 7.73 1,400 0.365 6.77 1,370 26.1 0.616 B–4 93.2 30.4 45,200 17.6 152 1,220 0.091 0.057 120 4.4 0.781 B–5A 5.5 168 1,300 5.27 12.9 64.5 0.006 <0.030 13.6 1.1 0.239 CMB–2W 13 127 9,980 4.61 175 312 0.02 <0.030 21.5 2.1 <0.100 DT–2 2.3 24.9 442 1.32 2.8 33.8 0.006 <0.030 11 0.8 0.379 Manhole outflow 2.6 13.3 92.3 0.29 3.36 22.3 <0.005 <0.030 6.8 0.41 <0.100 MB–4W 21.2 <4.0 7,510 5.72 <0.40 372 0.018 0.032 30.7 1.7 0.182 MB–5 20 23.8 4,050 7.26 3,870 4,780 0.047 0.087 38.5 2.5 0.166 MR–100P 247 4,920 269,000 301 5,760 11,700 0.05 0.352 402 9.9 0.624 MR–100PA 8.5 53.2 889 4.72 5.43 118 <0.005 <0.030 28.1 1.4 <0.100 MR–121 80 5.4 51,600 63.7 36.4 1,700 0.116 0.165 120 5.5 0.899 MR–123P 128 82.1 62,000 112 6.62 1,780 0.223 0.342 211 8.8 0.576 TB–10 29.3 43.5 18,500 8.02 0.63 372 0.021 0.121 48.2 1.8 0.348 TB–11B 8.9 586 4,950 2.31 12.9 135 0.011 <0.030 14.2 0.84 0.56 TB–12 84.9 10.8 35,300 34.3 <0.40 630 0.106 1.08 114 3.8 0.691 TB–13 31.9 9 29,100 17.8 2.73 644 0.056 0.067 66.3 4.1 2.03 TB–14D 24.9 9.7 16,000 10.5 <0.40 288 0.206 2.77 87.7 3.3 0.897

TB–15 4.2 33.4 45,800 0.84 255 2,910 0.008 0.057 6.4 15.3 0.454TB–15 1.2 18.4 17,700 0.27 113 1,370 0.009 <0.030 2.4 5.1 0.254TB–17D 1.2 <4.0 4,320 0.94 168 9,040 <0.005 <0.030 3 2.4 <0.100TB–17S 434 42.8 247,000 187 27.3 24,600 0.559 0.612 807 7 1.03TB–18D 2.6 5.9 7,630 0.69 233 1,170 <0.005 <0.030 6.8 3.9 0.122TB–1D 1.4 12.8 547 0.9 0.85 17.3 <0.005 0.044 36 <0.20 <0.100
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 17

Local well 

name

Copper, water, 

unfiltered, 

recoverable, 

μg/L

Iron, water, 

filtered, 

μg/L

Iron, water, 

unfiltered, 

recoverable, 

μg/L

Lead, water, 

unfiltered, 

recoverable, 

μg/L

Manganese, 

water, filtered, 

μg/L

Manganese, 

water, 

unfiltered, 

recoverable, 

μg/L

Mercury, 

water, 

unfiltered, 

recoverable, 

μg/L

Silver, water, 

unfiltered, 

recoverable, 

μg/L

Zinc, water, 

unfiltered, 

recoverable,

μg/L

Arsenic, water, 

unfiltered, 

μg/L

Selenium, 

water, 

unfiltered, 

μg/L

01042 01046 01045 01051 01056 01055 71900 01077 01092 01002 01147

TB–1S 7.1 <4.0 5,040 3.16 2,720 8,980 0.012 <0.030 12.3 1.5 0.123TB–2D 4 49.2 2,000 7.14 5.06 48.3 0.009 <0.030 12 0.69 <0.100TB–3D 667 806 39000 177 51.1 742 0.121 4.03 1980 32.3 1.1TB–4D 27.7 14.2 13,300 9.28 0.54 480 0.021 0.035 47 4.1 0.191TB–4S 133 14.8 114,000 39.6 0.41 3,340 0.126 0.136 158 3 0.4TB–5D 1.7 99.4 7,470 0.5 1,310 1,860 0.013 0.624 <4.0 2.5 <0.200TB–5S 483 53.8 227,000 237 2.6 5,480 1.24 2.25 739 14 2.18TB–8 9 39.8 5,370 4.44 4.05 252 0.016 <0.030 17.1 1.2 0.103TB–9 312 26.1 101,000 55.8 47 6,380 0.245 0.533 409 9.4 1.6WE–5078 2.5 19.3 822 1.22 105 112 <0.005 <0.030 10.7 0.23 <0.100WE–5079 2.4 15.1 197 0.54 5.45 11.8 <0.005 <0.030 6.7 1.1 <0.100East Basin 1 <4.0 23 <0.04 0.58 17.5 <0.005 <0.030 <2.0 0.25 <0.100East Basin 1.2 <4.0 24.1 <0.04 <0.40 17.5 <0.005 <0.030 <2.0 0.35 <0.100Seep E 1.6 8 52.5 0.18 1.94 3.7 0.006 <0.030 <2.0 <0.20 <0.100Equipment 

blank

— — — — — — — — — — —

Equipment 

blank

<0.80 <4.0 11.4 <0.04 <0.40 1.1 <0.005 <0.030 <2.0 <0.20 <0.100
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

18 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name 1,2,3-Trichlo- ropropane, water, unfiltered, recoverable, μg/L 1,2-Dibromo- 3-chloropropane, water, unfiltered, recoverable, μg/L 1,2-Dibromo- ethane, water, unfiltered, recoverable, μg/L 1,2-Dichloro- ethane, water, unfiltered, recoverable, μg/L 1,2-Dichloropro- pane, water, unfiltered, recoverable, μg/L 1,3-Dichloro- propane, water, unfiltered, recoverable, μg/L 1,4-Dichloro- benzene, water, unfiltered, recoverable, μg/L 1H-1,2,4-Tri- azole, water, filtered, recoverable, ng/L 2-(1-Hydroxyethyl)- 6-methylaniline, water, filtered, recoverable, ng/L 2,3,3-Trichloro- 2-propene- 1-sulfonic acid (sodium salt), water, filtered, recoverable, ng/L 77443 82625 77651 32103 34541 77173 34571 68498 68611 68691 105–P <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <2,380 <94.0 <54.0 109–P <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <94.0 <54.0 B–3P <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <300 <250 <54.0 B–4 <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0 B–5A <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <94.0 <54.0 CMB–2W <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0 DT–2 <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <94.0 <54.0 Manhole outflow <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <50.0 <94.0 <54.0 MB–4W <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0 MB–5 <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0 MR–100P <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <1,360 <250 <54.0 MR–100PA <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0 MR–121 <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <94.0 <54.0 MR–123P <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <263 <94.0 <54.0 TB–10 <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0 TB–11B <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0 TB–12 <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0 TB–13 <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <94.0 <54.0

TB–14D <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0TB–15 <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <94.0 <54.0TB–15 <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <94.0 <54.0TB–17D <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0TB–17S <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <986 <250 <54.0TB–18D <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0TB–1D <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 19

Local well 

name

1,2,3-Trichloropropane, 

water, 

unfiltered, 

recoverable, 

μg/L

1,2-Dibromo3-chloropropane, 

water, unfiltered, 

recoverable, 

μg/L

1,2-Dibromoethane, water, 

unfiltered, 

recoverable, 

μg/L

1,2-Dichloroethane, water, 

unfiltered, 

recoverable, 

μg/L

1,2-Dichloropropane, water, 

unfiltered, 

recoverable,

μg/L

1,3-Dichloropropane, water, 

unfiltered, 

recoverable,

μg/L

1,4-Dichlorobenzene, water, 

unfiltered, 

recoverable, 

μg/L

1H-1,2,4-Triazole, water, 

filtered, 

recoverable, 

ng/L

2-(1-Hydroxyethyl)-

6-methylaniline, 

water, filtered, 

recoverable, 

ng/L

2,3,3-Trichloro2-propene1-sulfonic acid 

(sodium salt), 

water, filtered, 

recoverable, 

ng/L

77443 82625 77651 32103 34541 77173 34571 68498 68611 68691

TB–1S <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0TB–2D <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0TB–3D <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <94.0 <54.0TB–4D <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0TB–4S <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0TB–5D <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0TB–5S <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0TB–8 <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0TB–9 <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0WE–5078 <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <50.0 <94.0 <54.0WE–5079 <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <50.0 <94.0 <54.0East Basin <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <15,100 <250 <54.0East Basin <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <581 <250 <54.0Seep E <0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0Equipment 

blank

<0.120 <0.400 <0.028 <0.08 <0.0260 <0.06 <0.026 <250 <250 <54.0

Equipment 

blank

— — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

20 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name 2,4,6-Trichloro- phenol, water, unfiltered, recoverable, μg/L 2,4-D, water, filtered, recoverable, ng/L 2,4-Dichloro- phenol, water, unfiltered, recoverable, μg/L 2,4-Dimethyl- phenol, water, unfiltered, recoverable, μg/L 2-[(2-Ethyl- 6-methylphenyl) amino]- 1-propanol, water, filtered, recoverable, ng/L 2-Aminoben- zimidazole, water, filtered, recoverable, ng/L 2-Amino-N- isopropyl- benzamide, water, filtered, recoverable, ng/L 2-Chloro- 2’,6’-diethyl- acetanilide, water, filtered, recoverable, ng/L 2-Chloro-4-iso- propylamino- 6-amino- s-triazine, water, filtered, recoverable, ng/L 2-Chloro-6-eth- ylamino-4-ami- no-s-triazine, water, filtered, recoverable, ng/L 2-Chloro-N-(2- ethyl-6-meth- ylphenyl) acetamide, water, filtered, recoverable, ng/L 34621 68500 34601 34606 68595 68502 68503 68525 68552 68550 68521 105–P

— <62.0

—

— <5.00 <9.00 <4.00 <5.00 <11.0 <20.0 <5.00

109–P

— <62.0

—

— <5.00 <9.00 <4.00 <5.00 <11.0 <20.0 <5.00

B–3P

— <62.0

—

— <5.00 <9.00 <4.00 <5.00 <11.0 <50.0 <5.00

B–4

— <62.0

—

— <5.00 <9.00 <4.00 <5.00 <11.0 <50.0 <5.00

B–5A

— <62.0

—

— <5.00 <9.00 <4.00 <5.00 <11.0 <20.0 <5.00

CMB–2W

— <62.0

—

— <5.00 <9.00 <4.00 <5.00 <11.0 <50.0 <5.00

DT–2

— <62.0

—

— <5.00 <9.00 <4.00 <5.00 <11.0 <20.0 <5.00

Manhole 

outflow

0.06 <62.0 0.05 <0.8 <5.00 <9.00 <4.00 <5.00 <11.0 <20.0 <5.00

MB–4W

— <62.0

—

— <5.00 <9.00 <4.00 <5.00 <11.0 <50.0 <5.00

MB–5

— <62.0

—

— <5.00 <9.00 <4.00 <5.00 <11.0 <50.0 <5.00

MR–100P

— <62.0

—

— <10.0 <9.00 <4.00 <5.00 <50.0 <20.0 <5.00

MR–100PA

— <62.0

—

— <10.0 <9.00 <4.00 <5.00 <50.0 <20.0 <5.00

MR–121

— <62.0

—

— <5.00 <9.00 <4.00 <5.00 <11.0 <20.0 <5.00

MR–123P

— <62.0

—

— <5.00 <9.00 <4.00 <5.00 <11.0 <20.0 <5.00

TB–10

— <62.0

—

— <10.0 <9.00 <4.00 <5.00 3.89 <20.0 <5.00

TB–11B

— <62.0

—

— <10.0 <9.00 <4.00 <5.00 <50.0 <20.0 <5.00

TB–12

— <62.0

—

— <10.0 <9.00 <4.00 <5.00 <50.0 <20.0 <5.00

TB–13

— <62.0

—

— <5.00 <9.00 <4.00 <5.00 <11.0 <20.0 <5.00

TB–14D

— <62.0

—

— <10.0 <9.00 <4.00 <5.00 <50.0 <20.0 <5.00

TB–15

— <62.0

—

— <5.00 <9.00 <4.00 <5.00 <11.0 <20.0 <5.00

TB–15

— <62.0

—

— <5.00 <9.00 <4.00 <5.00 <11.0 <20.0 <5.00

TB–17D

— <62.0

—

— <5.00 <9.00 <4.00 <5.00 <11.0 <50.0 <5.00

TB–17S

— <62.0

—

— <5.00 <9.00 <4.00 <5.00 8.44 <50.0 <5.00

TB–18D

— <62.0

—

— <5.00 <9.00 <4.00 <5.00 6.72 <50.0 <5.00

TB–1D

— <62.0

—

— <5.00 <9.00 <4.00 <5.00 <11.0 <50.0 <5.00
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 21

Local well 

name

2,4,6-Trichlorophenol, water, 

unfiltered, 

recoverable, 

μg/L

2,4-D, water, 

filtered, 

recoverable, 

ng/L

2,4-Dichlorophenol, water, 

unfiltered, 

recoverable, 

μg/L

2,4-Dimethylphenol, water, 

unfiltered, 

recoverable, 

μg/L

2-[(2-Ethyl6-methylphenyl)

amino]-

1-propanol, 

water, filtered, 

recoverable, 

ng/L

2-Aminobenzimidazole, 

water, 

filtered, 

recoverable, 

ng/L

2-Amino-Nisopropylbenzamide, 

water, filtered, 

recoverable, 

ng/L

2-Chloro2’,6’-diethylacetanilide, 

water, filtered, 

recoverable, 

ng/L

2-Chloro-4-isopropylamino6-aminos-triazine, 

water, filtered, 

recoverable, 

ng/L

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

water, filtered, 

recoverable, 

ng/L

2-Chloro-N-(2-

ethyl-6-methylphenyl)

acetamide, 

water, filtered, 

recoverable, 

ng/L

34621 68500 34601 34606 68595 68502 68503 68525 68552 68550 68521

TB–1S — <62.0 — — <5.00 <9.00 <4.00 <5.00 <11.0 <50.0 <5.00TB–2D — <62.0 — — <5.00 <9.00 <4.00 <5.00 <11.0 <50.0 <5.00TB–3D — <62.0 — — <5.00 <9.00 <4.00 <5.00 <11.0 <20.0 <5.00TB–4D — <62.0 — — <5.00 <9.00 <4.00 <5.00 <11.0 <50.0 <5.00TB–4S — <62.0 — — <5.00 <9.00 <4.00 <5.00 <11.0 <50.0 <5.00TB–5D — <62.0 — — <5.00 <9.00 <4.00 <5.00 <11.0 <50.0 <5.00TB–5S — <62.0 — — <5.00 <9.00 <4.00 <5.00 11.8 13.9 <5.00TB–8 — <62.0 — — <5.00 <9.00 <4.00 <5.00 <11.0 <50.0 <5.00TB–9 — <62.0 — — <5.00 <9.00 <4.00 <5.00 <11.0 <50.0 <5.00WE–5078 — <62.0 — — <5.00 <9.00 <4.00 <5.00 <50.0 <20.0 <5.00WE–5079 — <62.0 — — <5.00 <9.00 <4.00 <5.00 <11.0 <20.0 <5.00East Basin — <62.0 — — <5.00 <9.00 <4.00 <5.00 <11.0 <50.0 <5.00East Basin — <62.0 — — <5.00 <9.00 <4.00 <5.00 <11.0 <50.0 <5.00Seep E — <62.0 — — <5.00 <9.00 <4.00 <5.00 <11.0 <50.0 <5.00Equipment 

blank

— <62.0 — — <5.00 <9.00 <4.00 <5.00 <11.0 <50.0 <5.00

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

22 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name 2-Hydroxy- 4-isopropylami- no-6-amino- s-triazine, water, filtered, recoverable, ng/L 2-Hydroxy- 4-isopropylami- no-6-ethylami- no-s-triazine, water, filtered, recoverable, ng/L 2-Hydroxy- 6-ethylamino- 4-amino- s-triazine, water, filtered, recoverable, ng/L 2-Isopropyl- 6-methyl- 4-pyrimidinol, water, filtered, recoverable, ng/L 2-Methyl-4,6- dinitrophenol, water, unfiltered, recoverable, μg/L 3,4-Dichloro- phenylurea, water, filtered, recoverable, ng/L 3-Chloropro- pene, water, unfiltered, recoverable, μg/L 3-Hydroxy carbofuran, water, filtered, recoverable, ng/L 3-Phenoxy- benzoic acid, water, filtered, recoverable, ng/L 4-(Hydroxy- methyl) pendimethalin, water, filtered, recoverable, ng/L 4-Chloro- 3-methylphe- nol, water, unfiltered, recoverable, μg/L 68659 68660 68656 68505 34657 68226 78109 68508 68873 68511 34452 105–P <4.00 <8.00 <27.0 <20.0

— <144 <0.08 <16.0 <61.0 <213

—

109–P <4.00 <8.00 <10.0 <20.0

— <144 <0.08 <16.0 <61.0 <213

—

B–3P <4.00 <8.00 <14.4 <20.0

— <144 <0.08 <16.0 <100 <213

—

B–4 <4.00 <8.00 <10.0 <20.0

— <144 <0.08 <16.0 <100 <213

—

B–5A <4.00 <8.00 <10.0 <20.0

— <144 <0.08 <16.0 <61.0 <213

—

CMB–2W <4.00 <8.00 <10.0 <20.0

— <144 <0.08 <16.0 <100 <213

—

DT–2 <4.00 <8.00 <10.0 <20.0

— <144 <0.08 <16.0 <61.0 <213

—

Manhole 

outflow

<4.00 <8.00 <50.0 <20.0 <2 <144 <0.08 <16.0 <61.0 <213 <0.54

MB–4W <4.00 <8.00 <10.0 <20.0

— <144 <0.08 <16.0 <100 <213

—

MB–5 <4.00 <8.00 <10.0 <20.0

— <144 <0.08 <16.0 <100 <213

—

MR–100P <4.00 <8.00 <50.0 <20.0

— <144 <0.08 <16.0 <61.0 <213

—

MR–100PA <4.00 <8.00 <50.0 <20.0

— <144 <0.08 <16.0 <61.0 <213

—

MR–121 <4.00 <8.00 <10.0 <20.0

— <144 <0.08 <16.0 <61.0 <213

—

MR–123P <4.00 <8.00 <10.0 <20.0

— <144 <0.08 <16.0 <61.0 <213

—

TB–10 <4.00 <8.00 <50.0 <20.0

— <144 <0.08 <16.0 <61.0 <213

—

TB–11B <4.00 <8.00 <50.0 <20.0

— <144 <0.08 <16.0 <61.0 <213

—

TB–12 <4.00 <8.00 <50.0 3.8

— <144 <0.08 <16.0 <61.0 <213

—

TB–13 <4.00 <8.00 <10.0 <20.0

— <144 <0.08 <16.0 <61.0 <213

—

TB–14D <4.00 <8.00 <50.0 <20.0

— <144 <0.08 <16.0 <61.0 <213

—

TB–15 <4.00 <8.00 <10.0 <20.0

— <144 <0.08 <16.0 <61.0 <213

—

TB–15 <4.00 <8.00 <10.0 <20.0

— <144 <0.08 <16.0 <61.0 <213

—

TB–17D <4.00 <8.00 <10.0 <20.0

— <144 <0.08 <16.0 <100 <213

—

TB–17S <4.00 <8.00 <10.0 <20.0

— <144 <0.08 <16.0 <100 <213

—

TB–18D <4.00 <8.00 <10.0 <20.0

— <144 <0.08 <16.0 <100 <213

—

TB–1D <4.00 <8.00 <10.0 <20.0

— <144 <0.08 <16.0 <100 <213

—
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 23

Local well 

name

2-Hydroxy4-isopropylamino-6-aminos-triazine, 

water, filtered, 

recoverable, 

ng/L

2-Hydroxy4-isopropylamino-6-ethylamino-s-triazine, 

water, filtered, 

recoverable, 

ng/L

2-Hydroxy6-ethylamino4-aminos-triazine, 

water, filtered, 

recoverable, 

ng/L

2-Isopropyl6-methyl4-pyrimidinol, 

water, filtered, 

recoverable, 

ng/L

2-Methyl-4,6-

dinitrophenol, 

water, 

unfiltered, 

recoverable, 

μg/L

3,4-Dichlorophenylurea, 

water, filtered, 

recoverable, 

ng/L

3-Chloropropene, water, 

unfiltered, 

recoverable, 

μg/L

3-Hydroxy 

carbofuran, 

water, filtered, 

recoverable, 

ng/L

3-Phenoxybenzoic acid, 

water, filtered, 

recoverable, 

ng/L

4-(Hydroxymethyl) 

pendimethalin, 

water, filtered, 

recoverable, 

ng/L

4-Chloro3-methylphenol, water, 

unfiltered, 

recoverable, 

μg/L

68659 68660 68656 68505 34657 68226 78109 68508 68873 68511 34452

TB–1S <4.00 <8.00 <10.0 <20.0 — <144 <0.08 <16.0 <100 <213 —TB–2D <4.00 <8.00 <10.0 <20.0 — <144 <0.08 <16.0 <100 <213 —TB–3D <4.00 <8.00 <53.8 <20.0 — <144 <0.08 <16.0 <61.0 <213 —TB–4D <4.00 <8.00 <10.0 <20.0 — <144 <0.08 <16.0 <100 <213 —TB–4S <4.00 <8.00 <10.0 <20.0 — <144 <0.08 <16.0 <100 <213 —TB–5D <4.00 <8.00 <10.0 <20.0 — <144 <0.08 <16.0 <100 <213 —TB–5S <4.00 <8.00 <10.0 <20.0 — <144 <0.08 <16.0 <100 <213 —TB–8 <4.00 <8.00 <10.0 <20.0 — <144 <0.08 <16.0 <100 <213 —TB–9 <4.00 <8.00 <10.0 <20.0 — <144 <0.08 <16.0 <100 <213 —WE–5078 <5.00 <8.00 <100 <20.0 — <144 <0.08 <16.0 <250 <213 —WE–5079 <4.00 <8.00 <50.0 <20.0 — <144 <0.08 <16.0 <61.0 <213 —East Basin <4.47 <8.00 <10.0 E9.3 — <144 <0.08 <16.0 <100 <213 —East Basin <4.00 <8.00 <10.0 <20.0 — <144 <0.08 <16.0 <100 <213 —Seep E <4.00 <8.00 <10.0 <20.0 — <144 <0.08 <16.0 <100 <213 —Equipment 

blank

<4.00 <8.00 <10.0 <20.0 — <144 <0.08 <16.0 <100 <213 —

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

24 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name 4-Chloroben- zylmethyl sulfoxide, water, filtered, recoverable, ng/L 4-Hydroxy molinate, water, filtered, recoverable, ng/L 4-Hydroxy- chlorothalonil, water, filtered, recoverable, ng/L 4-Hydroxy- hexazinone A, water, filtered, recoverable, ng/L 4-Nitrophe- nol, water, unfiltered, recoverable, μg/L Acephate, water, filtered, recoverable, ng/L Acetochlor oxanilic acid, water, filtered, recoverable, ng/L Acetochlor sulfinylacetic acid, water, filtered, recoverable, ng/L Acetochlor sulfonic acid, water, filtered, recoverable, ng/L Acetochlor, water, filtered, recoverable, ng/L Acryloni- trile, water, unfiltered, recoverable, μg/L 68514 68515 68336 68517 34646 68519 68522 68524 68523 68520 34215 105–P <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

109–P <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

B–3P <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

B–4 <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

B–5A <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

CMB–2W <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

DT–2 <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

Manhole 

outflow

<4.00 <7.00 <98.0 <3.00 <0.52 <10.0 <90.0 <176 <100 <10.0 <0.56

MB–4W <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

MB–5 <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

MR–100P <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

MR–100PA <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

MR–121 <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

MR–123P <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

TB–10 <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

TB–11B <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

TB–12 <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

TB–13 <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

TB–14D <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

TB–15 <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

TB–15 <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

TB–17D <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

TB–17S <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

TB–18D <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56

TB–1D <4.00 <7.00 <98.0 <3.00

— <10.0 <90.0 <176 <100 <10.0 <0.56
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 25

Local well 

name

4-Chlorobenzylmethyl 

sulfoxide, 

water, filtered, 

recoverable, 

ng/L

4-Hydroxy 

molinate, 

water, filtered, 

recoverable, 

ng/L

4-Hydroxychlorothalonil, 

water, filtered, 

recoverable, 

ng/L

4-Hydroxyhexazinone A, 

water, filtered, 

recoverable, 

ng/L

4-Nitrophenol, water, 

unfiltered, 

recoverable, 

μg/L

Acephate, 

water, filtered, 

recoverable, 

ng/L

Acetochlor 

oxanilic acid, 

water, filtered, 

recoverable, 

ng/L

Acetochlor 

sulfinylacetic 

acid, water, 

filtered, 

recoverable, 

ng/L

Acetochlor 

sulfonic acid, 

water, filtered, 

recoverable, 

ng/L

Acetochlor, 

water, filtered, 

recoverable, 

ng/L

Acrylonitrile, water, 

unfiltered, 

recoverable, 

μg/L

68514 68515 68336 68517 34646 68519 68522 68524 68523 68520 34215

TB–1S <4.00 <7.00 <98.0 <3.00 — <10.0 <90.0 <176 <100 <10.0 <0.56TB–2D <4.00 <7.00 <98.0 <3.00 — <10.0 <90.0 <176 <100 <10.0 <0.56TB–3D <4.00 <7.00 <98.0 <3.00 — <10.0 <90.0 <176 <100 <10.0 <0.56TB–4D <4.00 <7.00 <98.0 <3.00 — <10.0 <90.0 <176 <100 <10.0 <0.56TB–4S <4.00 <7.00 <98.0 <3.00 — <10.0 <90.0 <176 <100 <10.0 <0.56TB–5D <4.00 <7.00 <98.0 <3.00 — <10.0 <90.0 <176 <100 <10.0 <0.56TB–5S <4.00 <7.00 <98.0 <3.00 — <10.0 <90.0 <176 <100 <10.0 <0.56TB–8 <4.00 <7.00 <98.0 <3.00 — <10.0 <90.0 <176 <100 <10.0 <0.56TB–9 <4.00 <7.00 <98.0 <3.00 — <10.0 <90.0 <176 <100 <10.0 <0.56WE–5078 <3.20 <7.00 <98.0 <3.00 — <10.0 <90.0 <176 <320 <10.0 <0.56WE–5079 <4.00 <7.00 <98.0 <3.00 — <10.0 <90.0 <176 <100 <10.0 <0.56East Basin <4.00 <7.00 <98.0 <3.00 — <10.0 <90.0 <176 <100 <10.0 <0.56East Basin <4.00 <7.00 <98.0 <3.00 — <10.0 <90.0 <176 <100 <10.0 <0.56Seep E <4.00 <7.00 <98.0 <3.00 — <10.0 <90.0 <176 <100 <10.0 <0.56Equipment 

blank

<4.00 <7.00 <98.0 <3.00 — <10.0 <90.0 <176 <100 <10.0 <0.56

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

26 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Alachlor oxanilic acid, water, filtered, recoverable, ng/L Alachlor sulfi- nylacetic acid, water, filtered, recoverable, ng/L Alachlor, water, filtered, recoverable, ng/L Aldicarb sulfone, water, filtered, recoverable, ng/L Aldicarb sulfoxide, water, filtered, recoverable, ng/L Aldicarb, water, filtered, recoverable, ng/L Ametryn, water, filtered, recoverable, ng/L Asulam, water, filtered, recoverable, ng/L Atrazine, water, filtered, recoverable, ng/L Azinphos-methyl oxygen analog, water, filtered, recoverable, ng/L Azinphos- methyl, water, filtered, recoverable, ng/L 68526 68527 65064 68529 68530 68528 68533 68536 65065 68211 65066 105–P <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00 109–P <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00 B–3P <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00 B–4 <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00 B–5A <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00 CMB–2W <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00 DT–2 <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00 Manhole outflow <84.0 <169 <50.0 <20.0 <3.00 <8.00 <3.00 <50.0 2.19 <15.0 <8.00 MB–4W <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 E3.97 <15.0 <8.00 MB–5 <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00 MR–100P <84.0 <169 <9.00 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00 MR–100PA <84.0 <169 <9.00 <20.0 <3.00 <8.00 <3.00 <50.0 2.07 <15.0 <8.00 MR–121 <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00 MR–123P <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00 TB–10 <84.0 <169 <9.00 <20.0 <3.00 <8.00 <3.00 <50.0 2.73 <15.0 <8.00 TB–11B <84.0 <169 <9.00 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00 TB–12 <84.0 <169 <9.00 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00 TB–13 <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00 TB–14D <84.0 <169 <9.00 <20.0 <3.00 <8.00 <3.00 <50.0 3.23 <15.0 <8.00

TB–15 <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00TB–15 <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00TB–17D <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00TB–17S <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 E4.48 <15.0 <8.00TB–18D <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 E3.23 <15.0 <8.00TB–1D <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 27

Local well 

name

Alachlor 

oxanilic acid, 

water, filtered, 

recoverable, 

ng/L

Alachlor sulfinylacetic acid, 

water, filtered, 

recoverable, 

ng/L

Alachlor, 

water, filtered, 

recoverable, 

ng/L

Aldicarb 

sulfone, water, 

filtered, 

recoverable, 

ng/L

Aldicarb 

sulfoxide, 

water, filtered, 

recoverable, 

ng/L

Aldicarb, 

water, 

filtered, 

recoverable, 

ng/L

Ametryn, 

water, 

filtered, 

recoverable, 

ng/L

Asulam, 

water, 

filtered, 

recoverable, 

ng/L

Atrazine, 

water, 

filtered, 

recoverable, 

ng/L

Azinphos-methyl 

oxygen analog, 

water, filtered, 

recoverable, 

ng/L

Azinphosmethyl, water, 

filtered, 

recoverable, 

ng/L

68526 68527 65064 68529 68530 68528 68533 68536 65065 68211 65066

TB–1S <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00TB–2D <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 E7.50 <15.0 <8.00TB–3D <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00TB–4D <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00TB–4S <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 E4.05 <15.0 <8.00TB–5D <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00TB–5S <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 E3.95 <15.0 <8.00TB–8 <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00TB–9 <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00WE–5078 <84.0 <169 <7.00 <20.0 <2.20 <8.00 <2.60 <50.0 <6.80 <15.0 <8.00WE–5079 <84.0 <169 <50.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00East Basin <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00East Basin <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00Seep E <84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 E4.10 <15.0 <8.00Equipment 

blank

<84.0 <169 <10.0 <20.0 <3.00 <8.00 <3.00 <50.0 <5.00 <15.0 <8.00

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

28 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Azoxystrobin, water, filtered, recoverable, ng/L Bentazon, water, filtered, recoverable, ng/L Bifenthrin, water, filtered, recoverable, ng/L Bromacil, water, filtered, recoverable, ng/L Bromomethane, water, unfiltered, recoverable, μg/L Bromoxynil, water, filtered, recoverable, ng/L Butralin, water, filtered, recoverable, ng/L Butylate, water, filtered, recoverable, ng/L Carbaryl, water, filtered, recoverable, ng/L Carbendazim, water, filtered, recoverable, ng/L Carbofuran, water, filtered, recoverable, ng/L 66589 68538 65067 68542 34413 68543 68545 65068 65069 68548 65070 105–P <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <10.0 <4.00 109–P <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <10.0 <4.00 B–3P <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <7.00 <4.00 B–4 <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00 B–5A <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <10.0 <4.00 CMB–2W <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00 DT–2 <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <10.0 <4.00 Manhole outflow <3.00 <10.0 <19.0 <10.0 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00 MB–4W 3.43 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00 MB–5 <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00 MR–100P <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <10.0 <6.00 <10.0 <4.00 MR–100PA <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <10.0 <6.00 <10.0 <4.00 MR–121 <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <10.0 <4.00 MR–123P <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <10.0 <4.00 TB–10 <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <10.0 <6.00 <10.0 <4.00 TB–11B <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <10.0 <6.00 <10.0 <4.00 TB–12 <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <10.0 <6.00 <10.0 <4.00 TB–13 <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <10.0 <4.00 TB–14D <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <10.0 <6.00 <10.0 <4.00

TB–15 <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <10.0 <4.00TB–15 <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <10.0 <4.00TB–17D <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00TB–17S <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00TB–18D <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00TB–1D <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 29

Local well 

name

Azoxystrobin, 

water, filtered, 

recoverable, 

ng/L

Bentazon, 

water, filtered, 

recoverable, 

ng/L

Bifenthrin, 

water, filtered, 

recoverable, 

ng/L

Bromacil, 

water, filtered, 

recoverable, 

ng/L

Bromomethane, 

water, 

unfiltered, 

recoverable, 

μg/L

Bromoxynil, 

water, filtered, 

recoverable, 

ng/L

Butralin, 

water, filtered, 

recoverable, 

ng/L

Butylate, 

water, filtered, 

recoverable, 

ng/L

Carbaryl, 

water, filtered, 

recoverable, 

ng/L

Carbendazim, 

water, filtered, 

recoverable, 

ng/L

Carbofuran, 

water, filtered, 

recoverable, 

ng/L

66589 68538 65067 68542 34413 68543 68545 65068 65069 68548 65070

TB–1S <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00TB–2D <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00TB–3D <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <10.0 <4.00TB–4D <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00TB–4S <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00TB–5D <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00TB–5S <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00TB–8 <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00TB–9 <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00WE–5078 <3.00 <9.0 <19.0 <5.60 <0.2 <79.0 <5.00 <10.0 <5.60 <10.0 <5.00WE–5079 <3.00 <10.0 <19.0 <10.0 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00East Basin <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00East Basin <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00Seep E <3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00Equipment 

blank

<3.00 <10.0 <19.0 <6.00 <0.2 <79.0 <5.00 <50.0 <6.00 <3.00 <4.00

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

30 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Carbon disulfide, water, unfiltered, μg/L Carboxy molinate, water, filtered, recoverable, ng/L Chlorimuron- ethyl, water, filtered, recoverable, ng/L Chlorodiami- no-s-triazine, water, filtered, recoverable, ng/L Chlorosulfon- amide acid, water, filtered, recoverable, ng/L Chlorpyrifos oxon, water, filtered, recoverable, ng/L Chlorpyrifos, water, filtered, recoverable, ng/L Chlorsulfuron, water, filtered, recoverable, ng/L cis-1,3-Dichloro- propene, water, unfiltered, recoverable, μg/L cis-Cyhalo- thric acid, water, filtered, recoverable, ng/L cis-Perme- thrin, water, filtered, recoverable, ng/L 77041 68549 68872 68547 68551 68216 65072 61678 34704 68553 68769 105–P E0.1 <50.0 <8.00 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.9 109–P <0.1 <50.0 <8.00 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.0 B–3P

M <22.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5

B–4 <0.1 <22.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5B–5A <0.1 <50.0 <8.00 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.0CMB–2W <0.1 <22.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5DT–2 <0.1 <50.0 <8.00 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.0Manhole 

outflow

<0.1 <50.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.0

MB–4W <0.1 <22.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5MB–5 <0.1 <22.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5MR–100P E0.1 <50.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <100 <2.0MR–100PA <0.1 <50.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <100 <2.0MR–121 <0.1 <50.0 <8.00 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.0MR–123P E0.1 <50.0 <8.00 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.0TB–10 <0.1 <50.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <100 <2.0TB–11B <0.1 <50.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <100 <2.0TB–12 <0.1 <50.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <100 <2.0TB–13 <0.1 <50.0 <8.00 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.0TB–14D <0.1 <50.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <100 <2.0TB–15 <0.1 <50.0 <8.00 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.0TB–15 <0.1 <50.0 <8.00 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.0TB–17D <0.1 <22.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5TB–17S <0.1 <22.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5TB–18D <0.1 <22.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5TB–1D <0.1 <22.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 31

Local well 

name

Carbon 

disulfide, 

water, 

unfiltered, 

μg/L

Carboxy 

molinate, 

water, filtered, 

recoverable, 

ng/L

Chlorimuronethyl, water, 

filtered, 

recoverable, 

ng/L

Chlorodiamino-s-triazine, 

water, filtered, 

recoverable, 

ng/L

Chlorosulfonamide acid, 

water, filtered, 

recoverable, 

ng/L

Chlorpyrifos 

oxon, water, 

filtered, 

recoverable, 

ng/L

Chlorpyrifos, 

water, filtered, 

recoverable, 

ng/L

Chlorsulfuron, 

water, filtered, 

recoverable, 

ng/L

cis-1,3-Dichloropropene, water, 

unfiltered, 

recoverable, 

μg/L

cis-Cyhalothric acid, 

water, filtered, 

recoverable, 

ng/L

cis-Permethrin, water, 

filtered, 

recoverable, 

ng/L

77041 68549 68872 68547 68551 68216 65072 61678 34704 68553 68769

TB–1S <0.1 <22.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5TB–2D <0.1 <22.0 <10.0 E21.4 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5TB–3D M <50.0 <8.00 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.0TB–4D <0.1 <22.0 <10.0 <24.0 <75.0 <4.00 5.35 <50.0 <0.10 <86.0 <2.5TB–4S <0.1 <22.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5TB–5D <0.1 <22.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5TB–5S <0.1 <22.0 <10.0 18 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5TB–8 <0.1 <22.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5TB–9 <0.1 <22.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5WE–5078 <0.1 <50.0 <8.80 <24.0 <75.0 <2.00 <3.00 <50.0 <0.10 <100 <4.2WE–5079 <0.1 <50.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.0East Basin <0.1 <22.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5East Basin <0.1 <22.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5Seep E <0.1 <22.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5Equipment 

blank

<0.1 <22.0 <10.0 <24.0 <75.0 <4.00 <4.00 <50.0 <0.10 <86.0 <2.5

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

32 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Cyanazine, water, filtered, recoverable, ng/L DCPA mono- acid, water, filtered, recov- erable, ng/L Dechloro- fipronil, water, filtered, recov- erable, ng/L Dechlorome- tolachlor, water, filtered, recoverable, ng/L Deiodo flubendiamide, water, filtered, recoverable, ng/L Deisopropyl prometryn, water, filtered, recoverable, ng/L Demethyl fluometuron, water, filtered, recoverable, ng/L Demethyl hexazinone B, water, filtered, recoverable, ng/L Demethyl norflurazon, water, filtered, recoverable, ng/L Desamino metribuzin, water, filtered, recoverable, ng/L Desamino-dik- eto metribuzin, water, filtered, recoverable, ng/L 66592 68560 68561 68562 68563 68564 68591 68566 68567 68568 68569 105–P <50.0 <500 <4.0 <2.00 <4.00 <3.00 <2.00 <10.0 <4.00 <9.00 <200 109–P <50.0 <500 <4.0 <2.00 <4.00 <3.00 <2.00 <10.0 <4.00 <9.00 <200 B–3P <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200 B–4 <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200 B–5A <50.0 <500 <4.0 <2.00 <4.00 <3.00 <2.00 <10.0 <4.00 <9.00 <200 CMB–2W <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200 DT–2 <50.0 <500 <4.0 <2.00 <4.00 <3.00 <2.00 <10.0 <4.00 <9.00 <200 Manhole outflow <50.0 <500 <4.0 <2.00 <10.0 <3.00 <2.00 <3.00 <4.00 <9.00 <200 MB–4W <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200 MB–5 <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200 MR–100P <50.0 <500 <4.0 <2.00 <10.0 <3.00 <2.00 <3.00 <4.00 <9.00 <200 MR–100PA <50.0 <500 <4.0 <2.00 <10.0 <3.00 <2.00 <3.00 <4.00 <9.00 <200 MR–121 <50.0 <500 <4.0 <2.00 <4.00 <3.00 <2.00 <10.0 <4.00 <9.00 <200 MR–123P <50.0 <500 <4.0 <2.00 <4.00 <3.00 <2.00 <10.0 <4.00 <9.00 <200 TB–10 <50.0 <500 <4.0 <2.00 <10.0 <3.00 <2.00 <3.00 <4.00 <9.00 <200 TB–11B <50.0 <500 <4.0 <2.00 <10.0 <3.00 <2.00 <3.00 <4.00 <9.00 <200 TB–12 <50.0 <500 <4.0 <2.00 <10.0 <3.00 <2.00 <3.00 <4.00 <9.00 <200 TB–13 <50.0 <500 <4.0 <2.00 <4.00 <3.00 <2.00 <10.0 <4.00 <9.00 <200 TB–14D <50.0 <500 <4.0 <2.00 <10.0 <3.00 <2.00 <3.00 <4.00 <9.00 <200

TB–15 <50.0 <500 <4.0 <2.00 <4.00 <3.00 <2.00 <10.0 <4.00 <9.00 <200TB–15 <50.0 <500 <4.0 <2.00 <4.00 <3.00 <2.00 <10.0 <4.00 <9.00 <200TB–17D <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200TB–17S <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200TB–18D <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200TB–1D <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 33

Local well 

name

Cyanazine, 

water, filtered, 

recoverable, 

ng/L

DCPA monoacid, water, 

filtered, recoverable, 

ng/L

Dechlorofipronil, water, 

filtered, recoverable, 

ng/L

Dechlorometolachlor, 

water, filtered, 

recoverable, 

ng/L

Deiodo 

flubendiamide, 

water, filtered, 

recoverable, 

ng/L

Deisopropyl 

prometryn, 

water, filtered, 

recoverable, 

ng/L

Demethyl 

fluometuron, 

water, filtered, 

recoverable, 

ng/L

Demethyl 

hexazinone B, 

water, filtered, 

recoverable, 

ng/L

Demethyl 

norflurazon, 

water, filtered, 

recoverable, 

ng/L

Desamino 

metribuzin, 

water, filtered, 

recoverable, 

ng/L

Desamino-diketo metribuzin, 

water, filtered, 

recoverable, 

ng/L

66592 68560 68561 68562 68563 68564 68591 68566 68567 68568 68569

TB–1S <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200TB–2D <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200TB–3D <50.0 <500 <4.0 <2.00 <4.00 <3.00 <2.00 <10.0 <4.00 <9.00 <200TB–4D <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200TB–4S <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200TB–5D <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200TB–5S <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200TB–8 <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200TB–9 <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200WE–5078 <50.0 <2,700 <3.8 <2.00 <10.0 <2.80 <3.60 <3.00 <4.00 <9.00 <200WE–5079 <50.0 <500 <4.0 <2.00 <10.0 <3.00 <2.00 <3.00 <4.00 <9.00 <200East Basin <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200East Basin <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200Seep E <50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200Equipment 

blank

<50.0 <500 <4.0 <2.00 <50.0 <3.00 <10.0 <3.00 <4.00 <9.00 <200

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

34 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Desulfinyl- fipronil amide, water, filtered, recoverable, ng/L Desulfinyl- fipronil, water, filtered, recoverable, ng/L Diazinon, water, filtered, recoverable, ng/L Diazoxon, water, filtered, recoverable, ng/L Dicamba, water, filtered, recoverable, ng/L Dichlorvos, water, filtered, recoverable, ng/L Dicrotophos, water, filtered, recoverable, ng/L Didemethyl hexazinone F, water, filtered, recoverable, ng/L Tebuthiuron Transformation Product 104, water, filtered, recoverable, ng/L Diflubenzuron, water, filtered, recoverable, ng/L Diflufenzopyr, water, filtered, recoverable, ng/L 68570 66607 65078 68236 68571 68572 68573 68574 68575 68576 68577 105–P <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0 109–P <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0 B–3P <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0 B–4 <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0 B–5A <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0 CMB–2W <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0 DT–2 <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0 Manhole outflow <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0 MB–4W <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0 MB–5 <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0 MR–100P <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0 MR–100PA <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0 MR–121 <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0 MR–123P <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0 TB–10 <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0 TB–11B <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0 TB–12 <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0 TB–13 <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0

TB–14D <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0TB–15 <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0TB–15 <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0TB–17D <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0TB–17S <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0TB–18D <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0TB–1D <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 35

Local well 

name

Desulfinylfipronil amide, 

water, filtered, 

recoverable, 

ng/L

Desulfinylfipronil, water, 

filtered, 

recoverable, 

ng/L

Diazinon, 

water, filtered, 

recoverable, 

ng/L

Diazoxon, 

water, filtered, 

recoverable, 

ng/L

Dicamba, 

water, filtered, 

recoverable, 

ng/L

Dichlorvos, 

water, filtered, 

recoverable, 

ng/L

Dicrotophos, 

water, filtered, 

recoverable, 

ng/L

Didemethyl 

hexazinone F, 

water, filtered, 

recoverable, 

ng/L

Tebuthiuron 

Transformation 

Product 104, 

water, filtered, 

recoverable, 

ng/L

Diflubenzuron, 

water, filtered, 

recoverable, 

ng/L

Diflufenzopyr, 

water, filtered, 

recoverable, 

ng/L

68570 66607 65078 68236 68571 68572 68573 68574 68575 68576 68577

TB–1S <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0TB–2D <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0TB–3D <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0TB–4D <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0TB–4S <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0TB–5D <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0TB–5S <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0TB–8 <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0TB–9 <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0WE–5078 <10.0 <3.8 <2.80 <4.00 <2,400 <52.0 <4.00 <10.0 <5.60 <6.00 <72.0WE–5079 <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0East Basin <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0East Basin <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0Seep E <9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0Equipment 

blank

<9.0 <4.0 <3.00 <4.00 <500 <52.0 <4.00 <10.0 <6.00 <6.00 <88.0

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

36 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Diketonitrile- isoxaflutole, water, filtered, recoverable, ng/L Dimethenamid oxanilic acid, water, filtered, recoverable, ng/L Dimethenamid sulfinylacetic acid, water, filtered, recoverable, ng/L Dimethenamid sulfonic acid, water, filtered, recoverable, ng/L Dimethenamid, water, filtered, recoverable, ng/L Dimethoate, water, filtered, recoverable, ng/L Disulfoton oxon sulfone, water, filtered, recoverable, ng/L Disulfoton oxon sulfox- ide, water, filtered, recoverable, ng/L Disulfoton oxon, water, filtered, recoverable, ng/L Disulfoton sulfone, water, filtered, recoverable, ng/L Disulfoton sulfoxide, water, filtered, recoverable, ng/L 68578 68581 68583 68582 68580 66596 68588 68587 68586 68589 68590 105–P <62.0 <85.0 <189 <79.0 <3.00 <3.00 E9.55 <7.00 <2.00 <9.00 <4.00 109–P <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <9.00 <4.00 B–3P <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00 B–4 <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00 B–5A <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <9.00 <4.00 CMB–2W <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00 DT–2 <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <9.00 <4.00 Manhole outflow <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <10.0 <4.00 MB–4W <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00 MB–5 <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00 MR–100P <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <9.00 <4.00 MR–100PA <62.0 <85.0 <189 <79.0 <3.00 <3.00 E3.84 <7.00 <2.00 <9.00 <4.00 MR–121 <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <9.00 <4.00 MR–123P <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <9.00 <4.00 TB–10 <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <9.00 <4.00 TB–11B <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <9.00 <4.00 TB–12 <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <9.00 <4.00 TB–13 <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <9.00 <4.00

TB–14D <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <9.00 <4.00TB–15 <62.0 <85.0 <189 <79.0 <3.00 <3.00 E3.62 <7.00 <2.00 <9.00 <4.00TB–15 <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <9.00 <4.00TB–17D <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00TB–17S <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.27 <7.00 <2.00 <50.0 <4.00TB–18D <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00TB–1D <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 37

Local well 

name

Diketonitrileisoxaflutole, 

water, filtered, 

recoverable, 

ng/L

Dimethenamid 

oxanilic acid, 

water, filtered, 

recoverable, 

ng/L

Dimethenamid 

sulfinylacetic 

acid, water, 

filtered, 

recoverable, 

ng/L

Dimethenamid 

sulfonic acid, 

water, filtered, 

recoverable, 

ng/L

Dimethenamid, 

water, filtered, 

recoverable, 

ng/L

Dimethoate, 

water, 

filtered, 

recoverable, 

ng/L

Disulfoton 

oxon sulfone, 

water, filtered, 

recoverable, 

ng/L

Disulfoton 

oxon sulfoxide, water, 

filtered, 

recoverable, 

ng/L

Disulfoton 

oxon, water, 

filtered, 

recoverable, 

ng/L

Disulfoton 

sulfone, water, 

filtered, 

recoverable, 

ng/L

Disulfoton 

sulfoxide, 

water, filtered, 

recoverable, 

ng/L

68578 68581 68583 68582 68580 66596 68588 68587 68586 68589 68590

TB–1S <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00TB–2D <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00TB–3D <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <9.00 <4.00TB–4D <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00TB–4S <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00TB–5D <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00TB–5S <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00TB–8 <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00TB–9 <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00WE–5078 <62.0 <85.0 <189 <79.0 <3.00 <4.60 <6.00 <6.00 <2.00 <9.00 <4.00WE–5079 <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <10.0 <4.00East Basin <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.33 <7.00 <2.00 <50.0 <4.00East Basin <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00Seep E <62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00Equipment 

blank

<62.0 <85.0 <189 <79.0 <3.00 <3.00 <7.00 <7.00 <2.00 <50.0 <4.00

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

38 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Disulfoton, water, filtered, recoverable, ng/L Diuron, water, filtered, recoverable, ng/L EPTC degra- date R248722, water, filtered, recoverable, ng/L EPTC, water, filtered, recoverable, ng/L Ethoprop, water, filtered, recoverable, ng/L Etoxazole, water, filtered, recoverable, ng/L Famoxadone, water, filtered, recoverable, ng/L Fenamiphos sulfone, water, filtered, recoverable, ng/L Fenamiphos sulfoxide, water, filtered, recoverable, ng/L Fenamiphos, water, filtered, recoverable, ng/L Fenbutatin oxide, water, filtered, recoverable, ng/L 67595 66598 68594 65080 68596 68598 67609 68600 68601 68599 68602 105–P <13.0 <10.7 <10.0 <206 <5.00 <2.00

— <5.00 <5.00 <2.00 <20.0

109–P <13.0 <5.00 <10.0 <206 <5.00 <2.00

— <5.00 <5.00 <2.00 <20.0

B–3P <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0B–4 <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0B–5A <13.0 <5.00 <10.0 <206 <5.00 <2.00

— <5.00 <5.00 <2.00 <20.0

CMB–2W <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0DT–2 <13.0 <5.00 <10.0 <206 <5.00 <2.00

— <5.00 <5.00 <2.00 <20.0

Manhole 

outflow

<13.0 <10.0 <4.00 <206 <5.00 <2.00

— <5.00 <10.0 <2.00 <20.0

MB–4W <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0MB–5 <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0MR–100P <13.0 <5.00 <4.00 <206 <5.00 <2.00

— <5.00 <5.00 <2.00 <20.0

MR–100PA <13.0 <5.00 <4.00 <206 <5.00 <2.00

— <5.00 <5.00 <2.00 <20.0

MR–121 <13.0 <5.00 <10.0 <206 <5.00 <2.00

— <5.00 <5.00 <2.00 <20.0

MR–123P <13.0 <5.00 <10.0 <206 <5.00 <2.00

— <5.00 <5.00 <2.00 <20.0

TB–10 <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <5.00 <5.00 <2.00 <20.0TB–11B <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <5.00 <5.00 <2.00 <20.0TB–12 <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <5.00 <5.00 <2.00 <20.0TB–13 <13.0 <5.00 <10.0 <206 <5.00 <2.00

— <5.00 <5.00 <2.00 <20.0

TB–14D <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <5.00 <5.00 <2.00 <20.0TB–15 <13.0 <5.00 <10.0 <206 <5.00 <2.00

— <5.00 <5.00 <2.00 <20.0

TB–15 <13.0 <5.00 <10.0 <206 <5.00 <2.00

— <5.00 <5.00 <2.00 <20.0

TB–17D <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0TB–17S <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0TB–18D <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0TB–1D <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 39

Local well 

name

Disulfoton, 

water, filtered, 

recoverable, 

ng/L

Diuron, water, 

filtered, 

recoverable, 

ng/L

EPTC degradate R248722, 

water, filtered, 

recoverable, 

ng/L

EPTC, water, 

filtered, 

recoverable, 

ng/L

Ethoprop, 

water, filtered, 

recoverable, 

ng/L

Etoxazole, 

water, filtered, 

recoverable, 

ng/L

Famoxadone, 

water, filtered, 

recoverable, 

ng/L

Fenamiphos 

sulfone, water, 

filtered,

 recoverable, 

ng/L

Fenamiphos 

sulfoxide, 

water, filtered, 

recoverable, 

ng/L

Fenamiphos, 

water, filtered, 

recoverable, 

ng/L

Fenbutatin 

oxide, water, 

filtered, 

recoverable, 

ng/L

67595 66598 68594 65080 68596 68598 67609 68600 68601 68599 68602

TB–1S <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0TB–2D <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0TB–3D <13.0 <5.00 <10.0 <206 <5.00 <2.00 — <5.00 <5.00 <2.00 <20.0TB–4D <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0TB–4S <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0TB–5D <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0TB–5S <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0TB–8 <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0TB–9 <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0WE–5078 <11.0 <5.00 <4.00 <206 <5.00 <4.20 — <5.00 <5.00 <2.00 <100WE–5079 <13.0 <10.0 <4.00 <206 <5.00 <2.00 — <5.00 <10.0 <2.00 <20.0East Basin <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0East Basin <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0Seep E <13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0Equipment 

blank

<13.0 <5.00 <4.00 <206 <5.00 <2.00 <250 <10.0 <5.00 <2.00 <20.0

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

40 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Fentin, water, filtered, recoverable, ng/L Fipronil amide, water, filtered, recoverable, ng/L Fipronil sulfide, water, filtered, recoverable, ng/L Fipronil sulfonate, water, filtered, recoverable, ng/L Fipronil sulfone, water, filtered, recoverable, ng/L Fipronil, water, filtered, recoverable, ng/L Flubendi- amide, water, filtered, recoverable, ng/L Flumetsulam, water, filtered, recoverable, ng/L Fluometuron, water, filtered, recoverable, ng/L Fonofos, water, filtered, recoverable, ng/L Halosulfuron methyl, water, filtered, recoverable, ng/L 68603 68604 66610 68605 66613 66604 68606 61679 68608 65084 61680 105–P <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <3.00 <11.0 <22.0 109–P <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <3.00 <11.0 <22.0 B–3P <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0 B–4 <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0 B–5A <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <3.00 <11.0 <22.0 CMB–2W <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0 DT–2 <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <3.00 <11.0 <22.0 Manhole outflow <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <3.00 <11.0 <22.0 MB–4W <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0 MB–5 <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0 MR–100P <25.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <3.00 <11.0 <22.0 MR–100PA <25.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <3.00 <11.0 <22.0 MR–121 <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <3.00 <11.0 <22.0 MR–123P <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <3.00 <11.0 <22.0 TB–10 <25.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <3.00 <11.0 <22.0 TB–11B <25.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <3.00 <11.0 <22.0 TB–12 <25.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <3.00 <11.0 <22.0 TB–13 <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <3.00 <11.0 <22.0 TB–14D <25.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <3.00 <11.0 <22.0

TB–15 <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <3.00 <11.0 <22.0TB–15 <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <3.00 <11.0 <22.0TB–17D <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0TB–17S <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0TB–18D <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0TB–1D <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 41

Local well 

name

Fentin, water, 

filtered, 

recoverable, 

ng/L

Fipronil amide, 

water, filtered, 

recoverable, 

ng/L

Fipronil 

sulfide, water, 

filtered, 

recoverable,

 ng/L

Fipronil 

sulfonate, 

water, filtered, 

recoverable, 

ng/L

Fipronil 

sulfone, water, 

filtered, 

recoverable, 

ng/L

Fipronil, water, 

filtered, 

recoverable, 

ng/L

Flubendiamide, water, 

filtered, 

recoverable, 

ng/L

Flumetsulam, 

water, filtered, 

recoverable, 

ng/L

Fluometuron, 

water, filtered, 

recoverable, 

ng/L

Fonofos, 

water, filtered, 

recoverable, 

ng/L

Halosulfuron 

methyl, water, 

filtered, 

recoverable, 

ng/L

68603 68604 66610 68605 66613 66604 68606 61679 68608 65084 61680

TB–1S <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0TB–2D <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0TB–3D <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <3.00 <11.0 <22.0TB–4D <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0TB–4S <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0TB–5D <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0TB–5S <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0TB–8 <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0TB–9 <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0WE–5078 <50.0 <9.2 <4.2 <96.0 <5.6 <4.0 <4.4 <17.0 <3.40 <11.0 <22.0WE–5079 <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <3.00 <11.0 <22.0East Basin <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0East Basin <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0Seep E <50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0Equipment 

blank

<50.0 <9.0 <4.0 <96.0 <4.0 <4.0 <5.0 <17.0 <50.0 <11.0 <22.0

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

42 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Hexachloro- benzene, wa- ter, unfiltered, recoverable, μg/L Hexazinone Transforma- tion Product C, water, filtered, recoverable, ng/L Hexazinone Transforma- tion Product D, water, filtered, recoverable, ng/L Hexazinone Transforma- tion Product E, water, filtered, recoverable, ng/L Hexazinone Transforma- tion Product G, water, filtered, recoverable, ng/L Hexazinone, water, filtered, recoverable, ng/L Hydroxy didemethyl fluometuron, water, filtered, recoverable, ng/L Hydroxy monodemethyl fluometuron, water, filtered, recoverable, ng/L Hydroxy- acetochlor, water, filtered, recoverable, ng/L Hydroxyala- chlor, water, filtered, recoverable, ng/L Hydroxydiazi- non, water, filtered, recoverable, ng/L 39700 68612 68613 68614 68713 65085 68619 68617 68615 68616 68618 105–P

— <2.00 <200 <76.0 <22.0 <3.00 <20.0 <10.0 <9.0 <8.00 <11.0

109–P

— <2.00 <200 <76.0 <22.0 <3.00 <20.0 <10.0 <9.0 <8.00 <11.0

B–3P

— <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0

B–4

— <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0

B–5A

— <2.00 <200 <76.0 <22.0 <3.00 <20.0 <10.0 <9.0 <8.00 <11.0

CMB–2W

— <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0

DT–2

— <2.00 <200 <76.0 <22.0 <3.00 <20.0 <10.0 <9.0 <8.00 <11.0

Manhole 

outflow

<0.30 <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0

MB–4W

— <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0

MB–5

— <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0

MR–100P

— <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <50.0 <8.00 <11.0

MR–100PA

— <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <50.0 <8.00 <11.0

MR–121

— <2.00 <200 <76.0 <22.0 <3.00 <20.0 <10.0 <9.0 <8.00 <11.0

MR–123P

— <2.00 <200 <76.0 <22.0 <3.00 <20.0 <10.0 <9.0 <8.00 <11.0

TB–10

— <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <50.0 <8.00 <11.0

TB–11B

— <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <50.0 <8.00 <11.0

TB–12

— <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <50.0 <8.00 <11.0

TB–13

— <2.00 <200 <76.0 <22.0 <3.00 <20.0 <10.0 <9.0 <8.00 <11.0

TB–14D

— <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <50.0 <8.00 <11.0

TB–15

— <2.00 <200 <76.0 <22.0 <3.00 <20.0 <10.0 <9.0 <8.00 <11.0

TB–15

— <2.00 <200 <76.0 <22.0 <3.00 <20.0 <10.0 <9.0 <8.00 <11.0

TB–17D

— <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0

TB–17S

— <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0

TB–18D

— <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0

TB–1D

— <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 43

Local well 

name

Hexachlorobenzene, water, unfiltered, 

recoverable, 

μg/L

Hexazinone 

Transformation Product C, 

water, filtered, 

recoverable, 

ng/L

Hexazinone 

Transformation Product D, 

water, filtered, 

recoverable, 

ng/L

Hexazinone 

Transformation Product E, 

water, filtered, 

recoverable, 

ng/L

Hexazinone 

Transformation Product G, 

water, filtered, 

recoverable, 

ng/L

Hexazinone, 

water, filtered, 

recoverable, 

ng/L

Hydroxy 

didemethyl 

fluometuron, 

water, filtered, 

recoverable, 

ng/L

Hydroxy 

monodemethyl 

fluometuron, 

water, filtered, 

recoverable, 

ng/L

Hydroxyacetochlor, 

water, filtered, 

recoverable, 

ng/L

Hydroxyalachlor, water, 

filtered, 

recoverable, 

ng/L

Hydroxydiazinon, water, 

filtered, 

recoverable, 

ng/L

39700 68612 68613 68614 68713 65085 68619 68617 68615 68616 68618

TB–1S — <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0TB–2D — <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0TB–3D — <2.00 <200 <76.0 <22.0 <3.00 <20.0 <10.0 <9.0 <8.00 <11.0TB–4D — <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0TB–4S — <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0TB–5D — <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0TB–5S — <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0TB–8 — <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0TB–9 — <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0WE–5078 — <2.00 <294 <76.0 <22.0 <3.60 <50.0 <12.0 <20.0 <6.00 <11.0WE–5079 — <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0East Basin — <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0East Basin — <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0Seep E — <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0Equipment 

blank

— <2.00 <200 <76.0 <22.0 <3.00 <50.0 <10.0 <10.0 <8.00 <11.0

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

44 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Hydroxy- fluometuron, water, filtered, recoverable, ng/L Hydroxyme- tolachlor, water, filtered, recoverable, ng/L Hydroxyphthala- zinone, water, filtered, recoverable, ng/L Hydroxysima- zine, water, filtered, recoverable, ng/L Tebuthiuron Transformation Product 109, water, filtered, recoverable, ng/L Imazamox, water, filtered, recoverable, ng/L Imazaquin, water, filtered, recoverable, ng/L Imazethapyr, water, filtered, recoverable, ng/L Imidacloprid, water, filtered, recoverable, ng/L Indoxacarb, water, filtered, recoverable, ng/L Iodometh- ane, water, unfiltered, recoverable, μg/L 68620 68622 68623 68624 68621 68625 61682 61683 68426 68627 77424 105–P <8.00 <2.00 <46.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 E0.14 109–P <8.00 <2.00 <46.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26 B–3P <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26 B–4 <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26 B–5A <8.00 <2.00 <46.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26 CMB–2W <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26 DT–2 <8.00 <2.00 <46.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26 Manhole outflow <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <10.0 <0.26 MB–4W <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26 MB–5 <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26 MR–100P <10.0 <2.50 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 E48.9 <8.00 <0.26 MR–100PA <10.0 <2.50 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26 MR–121 <8.00 <2.00 <46.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26 MR–123P <8.00 <2.00 <46.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26 TB–10 <10.0 <2.50 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26 TB–11B <10.0 <2.50 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26 TB–12 <10.0 <2.50 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26 TB–13 <8.00 <2.00 <46.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26

TB–14D <10.0 <2.50 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26TB–15 <8.00 <2.00 <46.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26TB–15 <8.00 <2.00 <46.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26TB–17D <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26TB–17S <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26TB–18D <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26TB–1D <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 45

Local well 

name

Hydroxyfluometuron, 

water, filtered, 

recoverable, 

ng/L

Hydroxymetolachlor, 

water, filtered, 

recoverable, 

ng/L

Hydroxyphthalazinone, water, 

filtered, 

recoverable, 

ng/L

Hydroxysimazine, water, 

filtered, 

recoverable, 

ng/L

Tebuthiuron 

Transformation 

Product 109, 

water, filtered, 

recoverable, 

ng/L

Imazamox, 

water, filtered, 

recoverable, 

ng/L

Imazaquin, 

water, filtered, 

recoverable, 

ng/L

Imazethapyr, 

water, filtered, 

recoverable, 

ng/L

Imidacloprid, 

water, filtered, 

recoverable, 

ng/L

Indoxacarb, 

water, 

filtered, 

recoverable, 

ng/L

Iodomethane, water, 

unfiltered, 

recoverable, 

μg/L

68620 68622 68623 68624 68621 68625 61682 61683 68426 68627 77424

TB–1S <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26TB–2D <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26TB–3D <8.00 <2.00 <46.0 <50.0 <11.0 <28.0 <19.0 <20.0 <13.3 <8.00 <0.26TB–4D <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26TB–4S <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26TB–5D <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26TB–5S <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26TB–8 <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26TB–9 <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26WE–5078 <8.00 <2.40 <50.0 <100 <11.0 <28.0 <18.0 <20.0 <16.0 <5.20 <0.26WE–5079 <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 56.7 <10.0 <0.26East Basin <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26East Basin <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26Seep E <8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26Equipment 

blank

<8.00 <2.00 <50.0 <50.0 <11.0 <28.0 <19.0 <20.0 <11.0 <8.00 <0.26

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

46 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Isoxaflutole acid metabolite RPA 203328, water, filtered, recoverable, ng/L Isoxaflutole, water, filtered, recoverable, ng/L Kresoxim- methyl, water, filtered, recoverable, ng/L Lactofen, water, filtered, recoverable, ng/L Linuron, water, filtered, recoverable, ng/L Malaoxon, water, filtered, recoverable, ng/L Malathion, water, filtered, recoverable, ng/L MCPA, water, filtered, recoverable, ng/L Metalaxyl, water, filtered, recoverable, ng/L Metconazole, water, filtered, recoverable, ng/L Methamidophos, water, filtered, recoverable, ng/L 68633 68632 67670 68638 68639 68240 65087 68641 68437 66620 68644 105–P <9.0 <13.0 <5.00 <3.00 <6.00 <3.00 <6.00 <100 <6.00 <5.00 <50.0 109–P <9.0 <13.0 <5.00 <3.00 <6.00 <3.00 <6.00 <100 <6.00 <5.00 <50.0 B–3P <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00 B–4 <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00 B–5A <9.0 <13.0 <5.00 <3.00 <6.00 <3.00 <6.00 <100 <6.00 <5.00 <50.0 CMB–2W <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00 DT–2 <9.0 <13.0 <5.00 <3.00 <6.00 <3.00 <6.00 <100 <6.00 <5.00 <50.0 Manhole outflow <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <95.0 <6.00 <5.00 <50.0 MB–4W <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00 MB–5 <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00 MR–100P <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <10.0 MR–100PA <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <10.0 MR–121 <9.0 <13.0 <5.00 <3.00 <6.00 <3.00 <6.00 <100 <6.00 <5.00 <50.0 MR–123P <9.0 <13.0 <5.00 <3.00 <6.00 <3.00 <6.00 <100 <6.00 <5.00 <50.0 TB–10 <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <10.0 TB–11B <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <10.0 TB–12 <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <10.0 TB–13 <9.0 <13.0 <5.00 <3.00 <6.00 <3.00 <6.00 <100 <6.00 <5.00 <50.0

TB–14D <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <10.0TB–15 <9.0 <13.0 <5.00 <3.00 <6.00 <3.00 <6.00 <100 <6.00 <5.00 <50.0TB–15 <9.0 <13.0 <5.00 <3.00 <6.00 <3.00 <6.00 <100 <6.00 <5.00 <50.0TB–17D <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00TB–17S <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00TB–18D <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00TB–1D <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 47

Local well 

name

Isoxaflutole 

acid metabolite 

RPA 203328, 

water, filtered, 

recoverable, 

ng/L

Isoxaflutole, 

water, filtered, 

recoverable, 

ng/L

Kresoximmethyl, water, 

filtered, 

recoverable, 

ng/L

Lactofen, 

water, filtered, 

recoverable, 

ng/L

Linuron, water, 

filtered, 

recoverable, 

ng/L

Malaoxon, 

water, filtered, 

recoverable, 

ng/L

Malathion, 

water, filtered, 

recoverable, 

ng/L

MCPA, water, 

filtered, 

recoverable, 

ng/L

Metalaxyl, 

water, filtered, 

recoverable, 

ng/L

Metconazole, 

water, filtered, 

recoverable, 

ng/L

Methamidophos, 

water, filtered, 

recoverable, 

ng/L

68633 68632 67670 68638 68639 68240 65087 68641 68437 66620 68644

TB–1S <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00TB–2D <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00TB–3D <9.0 <13.0 <5.00 <3.00 <6.00 <3.00 <6.00 <100 <6.00 <5.00 <50.0TB–4D <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00TB–4S <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00TB–5D <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00TB–5S <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00TB–8 <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00TB–9 <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00WE–5078 <9.2 <50.0 <5.00 <10.0 <5.60 <2.50 <5.40 <95.0 <6.00 <5.00 <10.0WE–5079 <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <95.0 <6.00 <5.00 <50.0East Basin <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00East Basin <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00Seep E <9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00Equipment 

blank

<9.0 <50.0 <5.00 <3.00 <6.00 <3.00 <6.00 <250 <6.00 <5.00 <3.00

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

48 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Methidathion, water, filtered, recoverable, ng/L Methomyl oxime, water, filtered, recoverable, ng/L Methomyl, water, filtered, recoverable, ng/L Methoxyfe- nozide, water, filtered, recoverable, ng/L Methyl paraoxon, water, filtered, recoverable, ng/L Metolachlor hydroxy morpholinone, water, filtered, recoverable, ng/L Metolachlor oxanilic acid, water, filtered, recoverable, ng/L Metolachlor sulfonic acid, water, filtered, recoverable, ng/L Metolachlor, water, filtered, recoverable, ng/L Metribuzin DK, water, filtered, recoverable, ng/L Metribuzin, water, filtered, recoverable, ng/L 65088 68646 68645 68647 68648 68649 68650 68651 65090 68653 68652 105–P <10.0 <1,000 <3.00 <2.00 <19.0 <50.0 <149 <68.0 <9.0 <200 <20.0 109–P <10.0 <1,000 <3.00 <2.00 <19.0 <50.0 <149 <68.0 <9.0 <200 <20.0 B–3P <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0

— <20.0

B–4 <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0

— <20.0

B–5A <10.0 <1,000 <3.00 <2.00 <19.0 <50.0 <149 <68.0 <9.0 <200 <20.0CMB–2W <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0

— <20.0

DT–2 <10.0 <1,000 <3.00 <2.00 <19.0 <50.0 <149 <68.0 <9.0 <200 <20.0Manhole 

outflow

<10.0 <500 <3.00 <2.00 <19.0 <50.0 <149 <68.0 <9.0 <200 <20.0

MB–4W <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0

— <20.0

MB–5 <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0

— <20.0

MR–100P <10.0 <500 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0

— <20.0

MR–100PA <10.0 <500 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0

— <20.0

MR–121 <10.0 <1,000 <3.00 <2.00 <19.0 <50.0 <149 <68.0 <9.0 <200 <20.0MR–123P <10.0 <1,000 <3.00 <2.00 <19.0 <50.0 <149 <68.0 <9.0 <200 <20.0TB–10 <10.0 <500 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0

— <20.0

TB–11B <10.0 <500 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0

— <20.0

TB–12 <10.0 <500 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0

— <20.0

TB–13 <10.0 <1,000 <3.00 <2.00 <19.0 <50.0 <149 <68.0 <9.0 <200 <20.0TB–14D <10.0 <500 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0

— <20.0

TB–15 <10.0 <1,000 <3.00 <2.00 <19.0 <50.0 <149 16.7 <9.0 <200 <20.0TB–15 <10.0 <1,000 <3.00 <2.00 <19.0 <50.0 <149 10.3 <9.0 <200 <20.0TB–17D <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0

— <20.0

TB–17S <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0

— <20.0

TB–18D <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0

— <20.0

TB–1D <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0

— <20.0
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 49

Local well 

name

Methidathion, 

water, filtered, 

recoverable, 

ng/L

Methomyl 

oxime, water, 

filtered, 

recoverable, 

ng/L

Methomyl, 

water, filtered, 

recoverable, 

ng/L

Methoxyfenozide, water, 

filtered, 

recoverable, 

ng/L

Methyl 

paraoxon, 

water, filtered, 

recoverable, 

ng/L

Metolachlor 

hydroxy 

morpholinone, 

water, filtered, 

recoverable, 

ng/L

Metolachlor 

oxanilic acid, 

water, filtered, 

recoverable, 

ng/L

Metolachlor 

sulfonic acid, 

water, filtered, 

recoverable, 

ng/L

Metolachlor, 

water, filtered, 

recoverable, 

ng/L

Metribuzin DK, 

water, filtered, 

recoverable, 

ng/L

Metribuzin, 

water, filtered, 

recoverable, 

ng/L

65088 68646 68645 68647 68648 68649 68650 68651 65090 68653 68652

TB–1S <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 3.2 — <20.0TB–2D <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0 — <20.0TB–3D <10.0 <1,000 <3.00 <2.00 <19.0 <50.0 <149 <68.0 <9.0 <200 <20.0TB–4D <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0 — <20.0TB–4S <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0 — <20.0TB–5D <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0 — <20.0TB–5S <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0 — <20.0TB–8 <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0 — <20.0TB–9 <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0 — <20.0WE–5078 <8.40 <1,000 <3.00 <2.20 <50.0 <10.0 <149 <68.0 <9.0 <250 <20.0WE–5079 <10.0 <500 <3.00 <2.00 <19.0 <50.0 <149 <68.0 <9.0 <200 <20.0East Basin <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0 — <20.0East Basin <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0 — <20.0Seep E <10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0 — <20.0Equipment 

blank

<10.0 <1,000 <3.00 <2.00 <19.0 <10.0 <149 <68.0 <9.0 — <20.0

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

50 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Molinate, water, filtered, recoverable, ng/L Myclobutanil, water, filtered, recoverable, ng/L N-(3,4- Dichlorophenyl)- N’-methylurea, water, filtered, recoverable, ng/L Naled, water, filtered, recoverable, ng/L Nicosulfuron, water, filtered, recoverable, ng/L Norflura- zon, water, filtered, recoverable, ng/L Novaluron, water, filtered, recoverable, ng/L O-Ethyl O- methyl S-propyl phosphorothio- ate, water, filtered, recoverable, ng/L O-Ethyl S-methyl S-propyl phos- phorodithioate, water, filtered, recoverable, ng/L O-Ethyl S-propyl phos- phorothioate, water, filtered, recoverable, ng/L Ometho- ate, water, filtered, recoverable, ng/L 65091 66632 68231 68654 61685 67685 68655 68597 68657 68658 68661 105–P <18.0 <7.00 <5.00 <30.0 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00 109–P <18.0 <7.00 <5.00 <30.0 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00 B–3P <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00 B–4 <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00 B–5A <18.0 <7.00 <5.00 <30.0 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00 CMB–2W <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00 DT–2 <18.0 <7.00 <5.00 <30.0 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00 Manhole outflow <50.0 <7.00 <5.00 <30.0 <14.0 <4.00 <9.00 <5.00 <4.00 <64.0 <2.00 MB–4W <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00 MB–5 <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00 MR–100P <50.0 <7.00 <5.00 <250 <14.0 <10.0 <9.00 <5.00 <4.00 <64.0 <2.00 MR–100PA <50.0 <7.00 <5.00 <250 <14.0 <10.0 <9.00 <5.00 <4.00 <64.0 <2.00 MR–121 <18.0 <7.00 <5.00 <30.0 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00 MR–123P <18.0 <7.00 <5.00 <30.0 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00 TB–10 <50.0 <7.00 <5.00 <250 <14.0 <10.0 <9.00 <5.00 <4.00 <64.0 <2.00 TB–11B <50.0 <7.00 <5.00 <250 <14.0 <10.0 <9.00 <5.00 <4.00 <64.0 <2.00 TB–12 <50.0 <7.00 <5.00 <250 <14.0 <10.0 <9.00 <5.00 <4.00 <64.0 <2.00 TB–13 <18.0 <7.00 <5.00 <30.0 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00

TB–14D <50.0 <7.00 <5.00 <250 <14.0 <10.0 <9.00 <5.00 <4.00 <64.0 <2.00TB–15 <18.0 <7.00 <5.00 <30.0 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00TB–15 <18.0 <7.00 <5.00 <30.0 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00TB–17D <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00TB–17S <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00TB–18D <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00TB–1D <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 51

Local well 

name

Molinate, 

water, 

filtered, 

recoverable, 

ng/L

Myclobutanil, 

water, filtered, 

recoverable, 

ng/L

N-(3,4-

Dichlorophenyl)-

N’-methylurea, 

water, filtered, 

recoverable, 

ng/L

Naled, water, 

filtered, 

recoverable, 

ng/L

Nicosulfuron, 

water, filtered, 

recoverable, 

ng/L

Norflurazon, water, 

filtered, 

recoverable, 

ng/L

Novaluron, 

water, 

filtered, 

recoverable, 

ng/L

O-Ethyl Omethyl S-propyl 

phosphorothioate, water, 

filtered, 

recoverable, 

ng/L

O-Ethyl 

S-methyl 

S-propyl phosphorodithioate, 

water, filtered, 

recoverable, 

ng/L

O-Ethyl 

S-propyl phosphorothioate, 

water, filtered, 

recoverable, 

ng/L

Omethoate, water, 

filtered, 

recoverable, 

ng/L

65091 66632 68231 68654 61685 67685 68655 68597 68657 68658 68661

TB–1S <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00TB–2D <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00TB–3D <18.0 <7.00 <5.00 <30.0 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00TB–4D <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00TB–4S <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00TB–5D <50.0 <7.00 <5.00 <250 E3.05 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00TB–5S <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00TB–8 <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00TB–9 <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00WE–5078 <50.0 <7.00 <5.00 <56.0 <12.0 <3.40 <250 <5.00 <3.00 <64.0 <2.00WE–5079 <50.0 <7.00 <5.00 <30.0 <14.0 <4.00 <9.00 <5.00 <4.00 <64.0 <2.00East Basin <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00East Basin <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00Seep E <50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00Equipment 

blank

<50.0 <7.00 <5.00 <250 <14.0 <4.00 <10.0 <5.00 <4.00 <64.0 <2.00

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

52 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Orthosulfa- muron, water, filtered, recoverable, ng/L Oryzalin, water, filtered, recoverable, ng/L Oxamyl oxime, water, filtered, recoverable, ng/L Oxamyl, water, filtered, recoverable, ng/L Oxyfluorfen, water, filtered, recoverable, ng/L Paraoxon, water, filtered, recoverable, ng/L Pendimethalin, water, filtered, recoverable, ng/L Pentachloro- phenol, water, unfiltered, recoverable, μg/L Phorate oxon sulfoxide, water, filtered, recoverable, ng/L Phorate oxygen analog sulfone, water, filtered, recoverable, ng/L Phorate oxy- gen analog, water, filtered, recoverable, ng/L 68662 68663 68665 68664 65093 68666 65098 39032 68671 68670 68669 105–P <6.00 <50.0 <50.0 <2.00 <500 <4.00 <5.9

— <7.00 <20.0 <250

109–P <6.00 <50.0 <50.0 <2.00 <500 <4.00 <4.6

— <7.00 <20.0 <250

B–3P <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0

— <7.00 <20.0 <250

B–4 <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0

— <7.00 <20.0 <250

B–5A <6.00 <50.0 <50.0 <2.00 <500 <4.00 <3.0

— <7.00 <20.0 <250

CMB–2W <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0

— <7.00 <20.0 <250

DT–2 <6.00 <50.0 <50.0 <2.00 <500 <4.00 <3.0

— <7.00 <20.0 <250

Manhole 

outflow

<6.00 <11.0 <50.0 <2.00 <500 <4.00 <3.0 0.2 <7.00 <20.0 <250

MB–4W <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0

— <7.00 <20.0 <250

MB–5 <6.00 <50.0 <2.00 <2.00 <500 <4.00 <6.0

— <7.00 <20.0 <250

MR–100P <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0

— <7.00 <20.0 <250

MR–100PA <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0

— <7.00 <20.0 <250

MR–121 <6.00 <50.0 <50.0 <2.00 <500 <4.00 <3.0

— <7.00 <20.0 <250

MR–123P <6.00 <50.0 <50.0 <2.00 <500 <4.00 <3.0

— <7.00 <20.0 <250

TB–10 <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0

— <7.00 <20.0 <250

TB–11B <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0

— <7.00 <20.0 <250

TB–12 <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0

— <7.00 <20.0 <250

TB–13 <6.00 <50.0 <50.0 <2.00 <500 <4.00 <3.0

— <7.00 <20.0 <250

TB–14D <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0

— <7.00 <20.0 <250

TB–15 <6.00 <50.0 <50.0 <2.00 <500 <4.00 <3.0

— <7.00 <20.0 <250

TB–15 <6.00 <50.0 <50.0 <2.00 <500 <4.00 <3.0

— <7.00 <20.0 <250

TB–17D <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.8

— <7.00 <20.0 <250

TB–17S <6.00 <50.0 <2.00 <2.00 <500 <4.00 <6.2

— <7.00 <20.0 <250

TB–18D <6.00 <50.0 <2.00 <2.00 <500 <4.00 <6.5

— <7.00 <20.0 <250

TB–1D <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0

— <7.00 <20.0 <250
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 53

Local well 

name

Orthosulfamuron, water, 

filtered, 

recoverable, 

ng/L

Oryzalin, 

water, filtered, 

recoverable, 

ng/L

Oxamyl 

oxime, water, 

filtered, 

recoverable, 

ng/L

Oxamyl, 

water, filtered, 

recoverable, 

ng/L

Oxyfluorfen, 

water, filtered, 

recoverable, 

ng/L

Paraoxon, 

water, filtered, 

recoverable, 

ng/L

Pendimethalin, 

water, filtered, 

recoverable, 

ng/L

Pentachlorophenol, water, 

unfiltered, 

recoverable,

μg/L

Phorate oxon 

sulfoxide, 

water, filtered, 

recoverable, 

ng/L

Phorate 

oxygen analog 

sulfone, water, 

filtered, 

recoverable, 

ng/L

Phorate oxygen analog, 

water, filtered, 

recoverable, 

ng/L

68662 68663 68665 68664 65093 68666 65098 39032 68671 68670 68669

TB–1S <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0 — <7.00 <20.0 <250TB–2D <6.00 <50.0 <2.00 <2.00 <500 <4.00 <24.2 — <7.00 <20.0 <250TB–3D <6.00 <50.0 <50.0 <2.00 <500 <4.00 <3.0 — <7.00 <20.0 <250TB–4D <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0 — <7.00 <20.0 <250TB–4S <6.00 <50.0 <2.00 <2.00 <500 <4.00 <4.2 — <7.00 <20.0 <250TB–5D <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.5 — <7.00 <20.0 <250TB–5S <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0 — <7.00 <20.0 <250TB–8 <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0 — <7.00 <20.0 <250TB–9 <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0 — <7.00 <20.0 <250WE–5078 <6.00 <12.0 <5.00 <2.00 <500 <3.40 <10.0 — <7.00 <20.0 <100WE–5079 <6.00 <11.0 <50.0 <2.00 <500 <4.00 <5.1 — <7.00 <20.0 <250East Basin <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0 — <7.00 <20.0 <250East Basin <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0 — <7.00 <20.0 <250Seep E <6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0 — <7.00 <20.0 <250Equipment 

blank

<6.00 <50.0 <2.00 <2.00 <500 <4.00 <3.0 — <7.00 <20.0 <250

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

54 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Phorate sulfone, water, filtered, recoverable, ng/L Phorate sulfoxide, water, filtered, recoverable, ng/L Phorate, water, filtered, recoverable, ng/L Phthalazinone, water, filtered, recoverable, ng/L Piperonyl butoxide, water, filtered, recoverable, ng/L Profenofos, water, filtered, recoverable, ng/L Prometon, water, filtered, recoverable, ng/L Prometryn, water, filtered, recoverable, ng/L Propanil, water, filtered, recoverable, ng/L Propargite, water, filtered, recoverable, ng/L Propazine, water, filtered, recoverable, ng/L 68672 68673 68668 68675 65102 68676 67702 65103 66641 68677 68678 105–P <10.0 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00 109–P <10.0 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00 B–3P <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00 B–4 <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00 B–5A <10.0 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00 CMB–2W <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00 DT–2 <10.0 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00 Manhole outflow <9.00 <5.00 <10.0 <10.0 <25.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00 MB–4W <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00 MB–5 <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00 MR–100P <25.0 <5.00 <10.0 <6.00 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00 MR–100PA <25.0 <5.00 <10.0 <6.00 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00 MR–121 <10.0 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00 MR–123P <10.0 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00 TB–10 <25.0 <5.00 <10.0 <6.00 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00 TB–11B <25.0 <5.00 <10.0 <6.00 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00 TB–12 <25.0 <5.00 <10.0 <6.00 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00 TB–13 <10.0 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00 TB–14D <25.0 <5.00 <10.0 <6.00 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00

TB–15 <10.0 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00TB–15 <10.0 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00TB–17D <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00TB–17S <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00TB–18D <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00TB–1D <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 55

Local well 

name

Phorate 

sulfone, water, 

filtered, 

recoverable, 

ng/L

Phorate 

sulfoxide, 

water, filtered, 

recoverable, 

ng/L

Phorate, 

water, filtered, 

recoverable, 

ng/L

Phthalazinone, 

water, filtered, 

recoverable, 

ng/L

Piperonyl 

butoxide, 

water, filtered, 

recoverable, 

ng/L

Profenofos, 

water, filtered, 

recoverable, 

ng/L

Prometon, 

water, filtered, 

recoverable, 

ng/L

Prometryn, 

water, filtered, 

recoverable, 

ng/L

Propanil, 

water, filtered, 

recoverable, 

ng/L

Propargite, 

water, filtered, 

recoverable, 

ng/L

Propazine, 

water, filtered, 

recoverable, 

ng/L

68672 68673 68668 68675 65102 68676 67702 65103 66641 68677 68678

TB–1S <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00TB–2D <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00TB–3D <10.0 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00TB–4D <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00TB–4S <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00TB–5D <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00TB–5S <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00TB–8 <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00TB–9 <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00WE–5078 <10.0 <10.0 <11.0 <15.0 <60.0 <3.00 <4.00 <4.20 <12.0 <2.00 <3.20WE–5079 <9.00 <5.00 <10.0 <10.0 <25.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00East Basin <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00East Basin <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00Seep E <9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00Equipment 

blank

<9.00 <5.00 <6.00 <10.0 <4.0 <3.00 <4.00 <2.00 <11.0 <2.00 <4.00

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

56 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Propiconazole, water, filtered, recoverable, ng/L Propoxur, water, filtered, recoverable, ng/L Propyzamide, water, filtered, recoverable, ng/L Prosulfuron, water, filtered, recoverable, ng/L Pyraclos- trobin, water, filtered, recoverable, ng/L Pyridaben, water, filtered, recoverable, ng/L Pyriproxyfen, water, filtered, recoverable, ng/L sec-Aceto- chlor oxanilic acid, water, filtered, recoverable, ng/L sec-Alachlor oxanilic acid, water, filtered, recoverable, ng/L Siduron, water, filtered, recoverable, ng/L Simazine, water, filtered, recoverable, ng/L 66643 68679 67706 61687 66646 68682 68683 68684 68685 68686 65105 105–P <6.00 <4.00 <4.00 <10.0 <3.00 <3.00 <3.0 <250 <135 2.51 <10.0 109–P <6.00 <4.00 <4.00 <10.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0 B–3P <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0 B–4 <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0 B–5A <6.00 <4.00 <4.00 <10.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0 CMB–2W <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0 DT–2 <6.00 <4.00 <4.00 <10.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0 Manhole outflow <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0 MB–4W <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0 MB–5 <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0 MR–100P <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <100 <135 <5.00 <10.0 MR–100PA <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <100 <135 <5.00 <10.0 MR–121 <6.00 <4.00 <4.00 <10.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0 MR–123P <6.00 <4.00 <4.00 <10.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0 TB–10 <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <100 <135 <5.00 <10.0 TB–11B <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <100 <135 <5.00 <10.0 TB–12 <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <100 <135 <5.00 <10.0 TB–13 <6.00 <4.00 <4.00 <10.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0

TB–14D <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <100 <135 <5.00 <10.0TB–15 <6.00 <4.00 <4.00 <10.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0TB–15 <6.00 <4.00 <4.00 <10.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0TB–17D <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0TB–17S <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0TB–18D <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0TB–1D <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 57

Local well 

name

Propiconazole, 

water, filtered, 

recoverable, 

ng/L

Propoxur, 

water, filtered, 

recoverable, 

ng/L

Propyzamide, 

water, filtered, 

recoverable, 

ng/L

Prosulfuron, 

water, filtered, 

recoverable, 

ng/L

Pyraclostrobin, water, 

filtered, 

recoverable, 

ng/L

Pyridaben, 

water, filtered, 

recoverable, 

ng/L

Pyriproxyfen, 

water, filtered, 

recoverable, 

ng/L

sec-Acetochlor oxanilic 

acid, water, 

filtered, 

recoverable, 

ng/L

sec-Alachlor 

oxanilic acid, 

water, filtered, 

recoverable, 

ng/L

Siduron, 

water, filtered, 

recoverable, 

ng/L

Simazine, 

water, filtered, 

recoverable, 

ng/L

66643 68679 67706 61687 66646 68682 68683 68684 68685 68686 65105

TB–1S <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0TB–2D <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0TB–3D <6.00 <4.00 <4.00 <10.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0TB–4D <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0TB–4S <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0TB–5D <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0TB–5S <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0TB–8 <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0TB–9 <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0WE–5078 <6.00 <3.20 <2.40 <10.0 <2.40 <2.40 <3.0 <250 <135 <5.00 <7.20WE–5079 <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0East Basin <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0East Basin <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0Seep E <6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0Equipment 

blank

<6.00 <4.00 <4.00 <8.0 <3.00 <3.00 <3.0 <250 <135 <5.00 <10.0

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

58 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Sulfentrazone, water, filtered, recoverable, ng/L Sulfometuron- methyl, water, filtered, recoverable, ng/L Sulfosulfuron ethyl sulfone, water, filtered, recoverable, ng/L Sulfosulfuron, water, filtered, recoverable, ng/L Tebuconazole, water, filtered, recoverable, ng/L Tebufenozide, water, filtered, recoverable, ng/L Tebupirimfos oxon, water, filtered, recoverable, ng/L Tebupirimfos, water, filtered, recoverable, ng/L Tebuthiuron Transformation Product 106, water, filtered, recoverable, ng/L Tebuthiuron Transformation Product 108, water, filtered, recoverable, ng/L Tebuthiuron Transformation Product 109, water, filtered, recoverable, ng/L 68687 68688 68690 68689 66649 68692 68694 68693 68714 68696 68697 105–P <11.0 <4.00 <3.00 <9.00 <10.0 <2.00 <2.00 <2.00 <76.0 <10.0 <25.0 109–P <11.0 <4.00 <3.00 <9.00 <10.0 <2.00 <2.00 <2.00 <76.0 <10.0 <25.0 B–3P <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0 B–4 <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0 B–5A <11.0 <4.00 <3.00 <9.00 <10.0 <2.00 <2.00 <2.00 <76.0 <10.0 <25.0 CMB–2W <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0 DT–2 <11.0 <4.00 <3.00 <9.00 <10.0 <2.00 <2.00 <2.00 <76.0 <10.0 <25.0 Manhole outflow <50.0 <4.00 <3.00 <9.00 <5.00 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0 MB–4W <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0 MB–5 <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0 MR–100P <11.0 <4.00 <3.00 <10.0 <5.00 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0 MR–100PA <11.0 <4.00 <3.00 <10.0 <5.00 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0 MR–121 <11.0 <4.00 <3.00 <9.00 <10.0 <2.00 <2.00 <2.00 <76.0 <10.0 <25.0 MR–123P <11.0 <4.00 <3.00 <9.00 <10.0 <2.00 <2.00 <2.00 <76.0 <10.0 <25.0 TB–10 <11.0 <4.00 <3.00 <10.0 <5.00 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0 TB–11B <11.0 <4.00 <3.00 <10.0 <5.00 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0 TB–12 <11.0 <4.00 <3.00 <10.0 <5.00 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0 TB–13 <11.0 <4.00 <3.00 <9.00 <10.0 <2.00 <2.00 <2.00 <76.0 <10.0 <25.0

TB–14D <11.0 <4.00 <3.00 <10.0 <5.00 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0TB–15 <11.0 <4.00 <3.00 <9.00 <10.0 <2.00 <2.00 <2.00 <76.0 <10.0 <25.0TB–15 <11.0 <4.00 <3.00 <9.00 <10.0 <2.00 <2.00 <2.00 <76.0 <10.0 <25.0TB–17D <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 1.6TB–17S <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0TB–18D <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0TB–1D <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 59

Local well 

name

Sulfentrazone, 

water, filtered, 

recoverable, 

ng/L

Sulfometuronmethyl, water, 

filtered, 

recoverable, 

ng/L

Sulfosulfuron 

ethyl sulfone, 

water, filtered, 

recoverable, 

ng/L

Sulfosulfuron, 

water, filtered, 

recoverable, 

ng/L

Tebuconazole, 

water, filtered, 

recoverable, 

ng/L

Tebufenozide, 

water, filtered, 

recoverable, 

ng/L

Tebupirimfos 

oxon, water, 

filtered, 

recoverable, 

ng/L

Tebupirimfos, 

water, filtered, 

recoverable, 

ng/L

Tebuthiuron 

Transformation 

Product 106, 

water, filtered, 

recoverable, 

ng/L

Tebuthiuron 

Transformation 

Product 108, 

water, filtered, 

recoverable, 

ng/L

Tebuthiuron 

Transformation 

Product 109, 

water, filtered, 

recoverable, 

ng/L

68687 68688 68690 68689 66649 68692 68694 68693 68714 68696 68697

TB–1S <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0TB–2D <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0TB–3D <11.0 <4.00 <3.00 <9.00 <10.0 <2.00 <2.00 <2.00 <76.0 <10.0 <25.0TB–4D 16.5 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0TB–4S <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0TB–5D <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0TB–5S <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0TB–8 <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0TB–9 <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0WE–5078 <50.0 <4.00 <10.0 <11.0 <5.00 <2.00 <2.00 <2.00 <76.0 <10.0 <38.0WE–5079 <50.0 <4.00 <3.00 <9.00 <5.00 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0East Basin <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0East Basin <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0Seep E <11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0Equipment 

blank

<11.0 <4.00 <3.00 <9.00 <50.0 <2.00 <2.00 <2.00 <76.0 <10.0 <17.0

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

60 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Tebuthiuron, water, filtered, recoverable, ng/L Terbacil, water, filtered, recoverable, ng/L Terbufos oxon sulfoxide, water, filtered, recoverable, ng/L Terbufos oxon, water, filtered, recoverable, ng/L Terbufos oxygen analog sulfone, water, filtered, recoverable, ng/L Terbufos sulfone, water, filtered, recoverable, ng/L Terbufos sulfoxide, water, filtered, recoverable, ng/L Terbufos, water, filtered, recoverable, ng/L Terbuthylazine, water, filtered, recoverable, ng/L Tetraconazole, water, filtered, recoverable, ng/L Thiobencarb, water, filtered, recoverable, ng/L 68695 68698 68702 68700 68701 68703 68704 68699 66651 66654 65107 105–P <3.00 <21.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00 109–P <3.00 <21.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00 B–3P <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00 B–4 <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00 B–5A <3.00 <21.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00 CMB–2W <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00 DT–2 <3.00 <21.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00 Manhole outflow <3.00 <50.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00 MB–4W <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00 MB–5 <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00 MR–100P <3.00 <21.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00 MR–100PA <3.00 <21.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00 MR–121 <3.00 <21.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00 MR–123P <3.00 <21.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00 TB–10 <3.00 <21.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00 TB–11B <3.00 <21.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00 TB–12 <3.00 <21.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00 TB–13 <3.00 <21.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00

TB–14D <3.00 <21.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00TB–15 <3.00 <21.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00TB–15 <3.00 <21.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00TB–17D <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00TB–17S <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00TB–18D <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00TB–1D <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 61

Local well 

name

Tebuthiuron, 

water, 

filtered, 

recoverable, 

ng/L

Terbacil, 

water, 

filtered,

recoverable, 

ng/L

Terbufos oxon 

sulfoxide, 

water, filtered, 

recoverable, 

ng/L

Terbufos oxon, 

water, 

filtered, 

recoverable, 

ng/L

Terbufos 

oxygen analog 

sulfone, water, 

filtered, 

recoverable, 

ng/L

Terbufos 

sulfone, water, 

filtered, 

recoverable, 

ng/L

Terbufos 

sulfoxide, 

water, filtered, 

recoverable, 

ng/L

Terbufos, 

water, 

filtered, 

recoverable, 

ng/L

Terbuthylazine, 

water,

filtered, 

recoverable, 

ng/L

Tetraconazole, 

water, 

filtered, 

recoverable, 

ng/L

Thiobencarb, 

water, 

filtered, 

recoverable, 

ng/L

68695 68698 68702 68700 68701 68703 68704 68699 66651 66654 65107

TB–1S <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00TB–2D <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00TB–3D <3.00 <21.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00TB–4D <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00TB–4S <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00TB–5D <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00TB–5S <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00TB–8 <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00TB–9 <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00WE–5078 <3.00 <21.0 <4.00 <4.00 <11.0 <11.0 <3.00 <6.80 <3.60 <7.00 <4.20WE–5079 <3.00 <50.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00East Basin <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00East Basin <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00Seep E <3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00Equipment 

blank

<3.00 <25.0 <4.00 <4.00 <11.0 <11.0 <3.00 <4.00 <3.00 <6.00 <2.00

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

62 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name trans-1,3-Di- chloropropene, water, unfiltered, recoverable, μg/L trans-Perme- thrin, water, filtered, recoverable, ng/L Triallate, water, filtered, recoverable, ng/L Tribufos, water, filtered, recoverable, ng/L Triclopyr, water, filtered, recoverable, ng/L Trifloxystrobin, water, filtered, recoverable, ng/L 1,1,1,2-Tetra- chloroethane, water, unfiltered, recoverable, μg/L 1,1,1-Trichloro- ethane, water, unfiltered, recoverable, μg/L 1,1,2,2-Tet- rachloroeth- ane, water, unfiltered, recoverable, μg/L 1,1,2-Trichloro- 1,2,2-trifluoro- ethane, water, unfiltered, recoverable, μg/L 1,1,2-Trichloro- ethane, water, unfiltered, recoverable, μg/L 34699 68708 68710 68711 68712 66660 77562 34506 34516 77652 34511 105–P <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046 109–P <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046 B–3P <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046 B–4 <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046 B–5A <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046 CMB–2W <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046 DT–2 <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046 Manhole outflow <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046 MB–4W <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046 MB–5 <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046 MR–100P <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046 MR–100PA <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046 MR–121 <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046 MR–123P <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046 TB–10 <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046 TB–11B <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046 TB–12 <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046 TB–13 <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046

TB–14D <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046TB–15 <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046TB–15 <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046TB–17D <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046TB–17S <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046TB–18D <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046TB–1D <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 63

Local well 

name

trans-1,3-Dichloropropene, 

water, 

unfiltered, 

recoverable, 

μg/L

trans-Permethrin, water, 

filtered, 

recoverable, 

ng/L

Triallate, 

water, 

filtered, 

recoverable, 

ng/L

Tribufos, 

water, 

filtered, 

recoverable, 

ng/L

Triclopyr, 

water, 

filtered, 

recoverable, 

ng/L

Trifloxystrobin, 

water, 

filtered, 

recoverable, 

ng/L

1,1,1,2-Tetrachloroethane, 

water, 

unfiltered, 

recoverable, 

μg/L

1,1,1-Trichloroethane, water, 

unfiltered, 

recoverable, 

μg/L

1,1,2,2-Tetrachloroethane, water, 

unfiltered, 

recoverable, 

μg/L

1,1,2-Trichloro1,2,2-trifluoroethane, water, 

unfiltered, 

recoverable, 

μg/L

1,1,2-Trichloroethane, water, 

unfiltered, 

recoverable, 

μg/L

34699 68708 68710 68711 68712 66660 77562 34506 34516 77652 34511

TB–1S <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046TB–2D <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046TB–3D <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046TB–4D <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046TB–4S <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046TB–5D <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046TB–5S <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046TB–8 <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046TB–9 <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046WE–5078 <0.14 <3.80 <12.0 <2.00 <88.0 <2.80 <0.040 <0.030 <0.14 <0.025 <0.046WE–5079 <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046East Basin <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046East Basin <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046Seep E <0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046Equipment 

blank

<0.14 <4.00 <16.0 <2.00 <88.0 <2.00 <0.040 <0.030 <0.14 <0.025 <0.046

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

64 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name 1,1-Dichloro- ethane, water, unfiltered, recoverable, μg/L 1,1-Dichloro- ethene, water, unfiltered, recoverable, μg/L 1,1-Dichloro- propene, wa- ter, unfiltered, recoverable, μg/L 1,2,3,4-Tetra- methylben- zene, water, unfiltered, recoverable, μg/L 1,2,3,5-Tetra- methylben- zene, water, unfiltered, recoverable, μg/L 1,2,3-Trichloro- benzene, wa- ter, unfiltered, recoverable, μg/L 1,2,3-Tri- methylben- zene, water, unfiltered, recoverable, μg/L 1,2,4-Trichloro- benzene, wa- ter, unfiltered, recoverable, μg/L 1,2,4-Tri- methylben- zene, water, unfiltered, recoverable, μg/L 1,2-Dichloro- benzene, wa- ter, unfiltered, recoverable, μg/L 1,2-Diphenyl- hydrazine, wa- ter, unfiltered, recoverable, μg/L 34496 34501 77168 49999 50000 77613 77221 34551 77222 34536 82626 105–P <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

109–P <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

B–3P <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

B–4 <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

B–5A <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

CMB–2W <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

DT–2 <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

Manhole 

outflow

<0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.543 <0.028 <0.30

MB–4W <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

MB–5 <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

MR–100P <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

MR–100PA <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

MR–121 <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

MR–123P <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

TB–10 <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

TB–11B <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

TB–12 <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

TB–13 <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

TB–14D <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

TB–15 <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

TB–15 <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

TB–17D <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

TB–17S <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

TB–18D <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—

TB–1D <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028

—
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 65

Local well 

name

1,1-Dichloroethane, water, 

unfiltered, 

recoverable, 

μg/L

1,1-Dichloroethene, water, 

unfiltered, 

recoverable, 

μg/L

1,1-Dichloropropene, water, unfiltered, 

recoverable, 

μg/L

1,2,3,4-Tetramethylbenzene, water, 

unfiltered, 

recoverable, 

μg/L

1,2,3,5-Tetramethylbenzene, water, 

unfiltered, 

recoverable, 

μg/L

1,2,3-Trichlorobenzene, water, unfiltered, 

recoverable, 

μg/L

1,2,3-Trimethylbenzene, water, 

unfiltered, 

recoverable, 

μg/L

1,2,4-Trichlorobenzene, water, unfiltered, 

recoverable, 

μg/L

1,2,4-Trimethylbenzene, water, 

unfiltered, 

recoverable, 

μg/L

1,2-Dichlorobenzene, water, unfiltered, 

recoverable, 

μg/L

1,2-Diphenylhydrazine, water, unfiltered, 

recoverable, 

μg/L

34496 34501 77168 49999 50000 77613 77221 34551 77222 34536 82626

TB–1S <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028 —TB–2D <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028 —TB–3D <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028 —TB–4D <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028 —TB–4S <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028 —TB–5D <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028 —TB–5S <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028 —TB–8 <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028 —TB–9 <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028 —WE–5078 <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028 —WE–5079 <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028 —East Basin <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028 —East Basin <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028 —Seep E <0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028 —Equipment 

blank

<0.044 <0.025 <0.040 <0.10 <0.080 <0.06 <0.060 <0.08 <0.032 <0.028 —

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

66 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name 1,3,5-Trimeth- ylbenzene, wa- ter, unfiltered, recoverable, μg/L 1,3-Dichloro- benzene, wa- ter, unfiltered, recoverable, μg/L 2,2-Dichloro- propane, wa- ter, unfiltered, recoverable, μg/L 2,4-Dinitro- phenol, water, unfiltered, recoverable, μg/L 2,4-Dinitro- toluene, water, unfiltered, recoverable, μg/L 2,6-Dinitro- toluene, water, unfiltered, recoverable, μg/L 2-Chloronaph- thalene, water, unfiltered, recoverable, μg/L 2-Chlorophe- nol, water, unfiltered, recoverable, μg/L 2-Chloro- toluene, water, unfiltered, recoverable, μg/L 2-Ethyltolu- ene, water, unfiltered, recoverable, μg/L 2-Nitrophe- nol, water, unfiltered, recoverable, μg/L 77226 34566 77170 34616 34611 34626 34581 34586 77275 77220 34591 105–P <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

109–P <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

B–3P <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

B–4 <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

B–5A <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

CMB–2W <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

DT–2 <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

Manhole 

outflow

<0.032 <0.025 <0.06 <2 <0.56 <0.4 <0.24 0.02 <0.028 <0.032 E0.5

MB–4W <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

MB–5 <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

MR–100P <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

MR–100PA <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

MR–121 <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

MR–123P <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

TB–10 <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

TB–11B <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

TB–12 <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

TB–13 <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

TB–14D <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

TB–15 <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

TB–15 <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

TB–17D <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

TB–17S <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

TB–18D <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—

TB–1D <0.032 <0.025 <0.06

—

—

—

—

— <0.028 <0.032

—
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 67

Local well 

name

1,3,5-Trimethylbenzene, water, unfiltered, 

recoverable, 

μg/L

1,3-Dichlorobenzene, water, unfiltered, 

recoverable, 

μg/L

2,2-Dichloropropane, water, unfiltered, 

recoverable, 

μg/L

2,4-Dinitrophenol, water, 

unfiltered, 

recoverable, 

μg/L

2,4-Dinitrotoluene, water, 

unfiltered, 

recoverable, 

μg/L

2,6-Dinitrotoluene, water, 

unfiltered, 

recoverable, 

μg/L

2-Chloronaphthalene, water, 

unfiltered, 

recoverable, 

μg/L

2-Chlorophenol, water, 

unfiltered, 

recoverable, 

μg/L

2-Chlorotoluene, water, 

unfiltered, 

recoverable, 

μg/L

2-Ethyltoluene, water, 

unfiltered, 

recoverable, 

μg/L

2-Nitrophenol, water, 

unfiltered, 

recoverable, 

μg/L

77226 34566 77170 34616 34611 34626 34581 34586 77275 77220 34591

TB–1S <0.032 <0.025 <0.06 — — — — — <0.028 <0.032 —TB–2D <0.032 <0.025 <0.06 — — — — — <0.028 <0.032 —TB–3D <0.032 <0.025 <0.06 — — — — — <0.028 <0.032 —TB–4D <0.032 <0.025 <0.06 — — — — — <0.028 <0.032 —TB–4S <0.032 <0.025 <0.06 — — — — — <0.028 <0.032 —TB–5D <0.032 <0.025 <0.06 — — — — — <0.028 <0.032 —TB–5S <0.032 <0.025 <0.06 — — — — — <0.028 <0.032 —TB–8 <0.032 <0.025 <0.06 — — — — — <0.028 <0.032 —TB–9 <0.032 <0.025 <0.06 — — — — — <0.028 <0.032 —WE–5078 <0.032 <0.025 <0.06 — — — — — <0.028 <0.032 —WE–5079 <0.032 <0.025 <0.06 — — — — — <0.028 <0.032 —East Basin <0.032 <0.025 <0.06 — — — — — <0.028 <0.032 —East Basin <0.032 <0.025 <0.06 — — — — — <0.028 <0.032 —Seep E <0.032 <0.025 <0.06 — — — — — <0.028 <0.032 —Equipment 

blank

<0.032 <0.025 <0.06 — — — — — <0.028 <0.032 —

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

68 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name 3,3’-Dichloro- benzidine, water, unfiltered, recoverable, μg/L 4-Bromophenyl phenyl ether, water, unfiltered, recoverable, μg/L 4-Chlorophe- nyl phenyl ether, water, unfiltered, recoverable, μg/L 4-Chlorotolu- ene, water, unfiltered, recoverable, μg/L 4-Isopropyl- toluene, water, unfiltered, recoverable, μg/L 9H-Fluorene, water, unfiltered, recoverable, μg/L Acenaphthene, water, unfiltered, recoverable, μg/L Acenaph- thylene, water, unfiltered, recoverable, μg/L Acetone, water, unfiltered, recoverable, μg/L Alachlor sulfonic acid, water, filtered, recoverable, ng/L Anthracene, water, unfiltered, recoverable, μg/L 34631 34636 34641 77277 77356 34381 34205 34200 81552 68871 34220 105–P

—

—

— <0.042 <0.06

—

—

— 3.4 <200

—

109–P

—

—

— <0.042 <0.06

—

—

— <3.4 <200

—

B–3P

—

—

— <0.042 <0.06

—

—

— <3.4 <250

—

B–4

—

—

— <0.042 <0.06

—

—

— <3.4 <250

—

B–5A

—

—

— <0.042 <0.06

—

—

— <3.4 <200

—

CMB–2W

—

—

— <0.042 <0.06

—

—

— <3.4 <250

—

DT–2

—

—

— <0.042 <0.06

—

—

— <3.4 <200

—

Manhole 

outflow

<0.42 <0.24 <0.34 <0.042 <0.06 <0.34 <0.28 <0.30 <3.4 <250 <0.38

MB–4W

—

—

— <0.042 <0.06

—

—

— <3.4 <250

—

MB–5

—

—

— <0.042 <0.06

—

—

— <3.4 <250

—

MR–100P

—

—

— <0.042 <0.06

—

—

— 11.7 <250

—

MR–100PA

—

—

— <0.042 <0.06

—

—

— <3.4 <250

—

MR–121

—

—

— <0.042 <0.06

—

—

— <3.4 <200

—

MR–123P

—

—

— <0.042 <0.06

—

—

— <3.4 <200

—

TB–10

—

—

— <0.042 <0.06

—

—

— <3.4 <250

—

TB–11B

—

—

— <0.042 <0.06

—

—

— <3.4 <250

—

TB–12

—

—

— <0.042 <0.06

—

—

— <3.4 <250

—

TB–13

—

—

— <0.042 <0.06

—

—

— <3.4 <200

—

TB–14D

—

—

— <0.042 <0.06

—

—

— <3.4 <250

—

TB–15

—

—

— <0.042 <0.06

—

—

— <3.4 <200

—

TB–15

—

—

— <0.042 <0.06

—

—

— <3.4 <200

—

TB–17D

—

—

— <0.042 <0.06

—

—

— <3.4 <250

—

TB–17S

—

—

— <0.042 <0.06

—

—

— <3.4 <250

—

TB–18D

—

—

— <0.042 <0.06

—

—

— <3.4 <250

—

TB–1D

—

—

— <0.042 <0.06

—

—

— <3.4 <250

—
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 69

Local well 

name

3,3’-Dichlorobenzidine, 

water, 

unfiltered, 

recoverable, 

μg/L

4-Bromophenyl 

phenyl ether, 

water, 

unfiltered, 

recoverable, 

μg/L

4-Chlorophenyl phenyl 

ether, water, 

unfiltered, 

recoverable, 

μg/L

4-Chlorotoluene, water, 

unfiltered, 

recoverable, 

μg/L

4-Isopropyltoluene, water, 

unfiltered, 

recoverable, 

μg/L

9H-Fluorene, 

water, 

unfiltered, 

recoverable, 

μg/L

Acenaphthene, 

water, 

unfiltered, 

recoverable, 

μg/L

Acenaphthylene, water, 

unfiltered, 

recoverable, 

μg/L

Acetone, 

water, 

unfiltered, 

recoverable, 

μg/L

Alachlor 

sulfonic acid, 

water, filtered, 

recoverable, 

ng/L

Anthracene, 

water, 

unfiltered, 

recoverable, 

μg/L

34631 34636 34641 77277 77356 34381 34205 34200 81552 68871 34220

TB–1S — — — <0.042 <0.06 — — — <3.4 <250 —TB–2D — — — <0.042 <0.06 — — — <3.4 <250 —TB–3D — — — <0.042 <0.06 — — — 2.9 <200 —TB–4D — — — <0.042 <0.06 — — — <3.4 <250 —TB–4S — — — <0.042 <0.06 — — — <3.4 <250 —TB–5D — — — <0.042 <0.06 — — — <3.4 <250 —TB–5S — — — <0.042 <0.06 — — — <3.4 <250 —TB–8 — — — <0.042 <0.06 — — — <3.4 <250 —TB–9 — — — <0.042 <0.06 — — — <3.4 <250 —WE–5078 — — — <0.042 <0.06 — — — <3.4 <360 —WE–5079 — — — <0.042 <0.06 — — — <3.4 <250 —East Basin — — — <0.042 <0.06 — — — <3.4 <250 —East Basin — — — <0.042 <0.06 — — — <3.4 <250 —Seep E — — — <0.042 <0.06 — — — <3.4 <250 —Equipment 

blank

— — — <0.042 <0.06 — — — <3.4 <250 —

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

70 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Benzene, water, unfiltered, recoverable, μg/L Benzo[a] anthracene, water, unfiltered, recoverable, μg/L Benzo[a] pyrene, water, unfiltered, recoverable, μg/L Benzo[b] fluoran- thene, water, unfiltered, recoverable, μg/L Benzo[ghi] perylene, water, unfiltered, recoverable, μg/L Benzo[k]fluor- anthene, water, unfiltered, recoverable, μg/L Benzyl n-butyl phthalate, water, unfiltered, recoverable, μg/L Bis(2-chloroe- thoxy)methane, water, unfiltered, recoverable, μg/L Bis(2- chloroethyl) ether, water, unfiltered, recoverable, μg/L Bis(2-chlo- roisopropyl) ether, water, unfiltered, recoverable, μg/L Bis(2-ethyl- hexyl) phthal- ate, water, unfiltered, recoverable, μg/L 34030 34526 34247 34230 34521 34242 34292 34278 34273 34283 39100 105–P <0.026

—

—

—

—

—

—

—

—

—

—

109–P <0.026

—

—

—

—

—

—

—

—

—

—

B–3P <0.026

—

—

—

—

—

—

—

—

—

—

B–4 <0.026

—

—

—

—

—

—

—

—

—

—

B–5A <0.026

—

—

—

—

—

—

—

—

—

—

CMB–2W <0.026

—

—

—

—

—

—

—

—

—

—

DT–2 <0.026

—

—

—

—

—

—

—

—

—

—

Manhole 

outflow

<0.026 <0.26 <0.32 <0.30 <0.38 <0.30 <1.8 <0.24 <0.30 <0.14 <7.2

MB–4W <0.026

—

—

—

—

—

—

—

—

—

—

MB–5 <0.026

—

—

—

—

—

—

—

—

—

—

MR–100P <0.026

—

—

—

—

—

—

—

—

—

—

MR–100PA <0.026

—

—

—

—

—

—

—

—

—

—

MR–121 <0.026

—

—

—

—

—

—

—

—

—

—

MR–123P <0.026

—

—

—

—

—

—

—

—

—

—

TB–10 <0.026

—

—

—

—

—

—

—

—

—

—

TB–11B <0.026

—

—

—

—

—

—

—

—

—

—

TB–12 <0.026

—

—

—

—

—

—

—

—

—

—

TB–13 <0.026

—

—

—

—

—

—

—

—

—

—

TB–14D <0.026

—

—

—

—

—

—

—

—

—

—

TB–15 <0.026

—

—

—

—

—

—

—

—

—

—

TB–15 <0.026

—

—

—

—

—

—

—

—

—

—

TB–17D <0.026

—

—

—

—

—

—

—

—

—

—

TB–17S <0.026

—

—

—

—

—

—

—

—

—

—

TB–18D <0.026

—

—

—

—

—

—

—

—

—

—

TB–1D <0.026

—

—

—

—

—

—

—

—

—

—
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 71

Local well 

name

Benzene, 

water, 

unfiltered, 

recoverable,

μg/L

Benzo[a]

anthracene, 

water, 

unfiltered, 

recoverable, 

μg/L

Benzo[a]

pyrene, water, 

unfiltered, 

recoverable, 

μg/L

Benzo[b]

fluoranthene, water, 

unfiltered, 

recoverable, 

μg/L

Benzo[ghi]

perylene, 

water, 

unfiltered, 

recoverable, 

μg/L

Benzo[k]fluoranthene, 

water, 

unfiltered, 

recoverable, 

μg/L

Benzyl n-butyl 

phthalate, 

water, 

unfiltered, 

recoverable, 

μg/L

Bis(2-chloroethoxy)methane, 

water, 

unfiltered, 

recoverable, 

μg/L

Bis(2-

chloroethyl) 

ether, water, 

unfiltered, 

recoverable, 

μg/L

Bis(2-chloroisopropyl) 

ether, water, 

unfiltered, 

recoverable, 

μg/L

Bis(2-ethylhexyl) phthalate, water, 

unfiltered, 

recoverable, 

μg/L

34030 34526 34247 34230 34521 34242 34292 34278 34273 34283 39100

TB–1S <0.026 — — — — — — — — — —TB–2D <0.026 — — — — — — — — — —TB–3D 0.022 — — — — — — — — — —TB–4D <0.026 — — — — — — — — — —TB–4S <0.026 — — — — — — — — — —TB–5D <0.026 — — — — — — — — — —TB–5S <0.026 — — — — — — — — — —TB–8 <0.026 — — — — — — — — — —TB–9 <0.026 — — — — — — — — — —WE–5078 <0.026 — — — — — — — — — —WE–5079 <0.026 — — — — — — — — — —East Basin <0.026 — — — — — — — — — —East Basin <0.026 — — — — — — — — — —Seep E <0.026 — — — — — — — — — —Equipment 

blank

<0.026 — — — — — — — — — —

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

72 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Bromobenzene, water, unfiltered, recoverable, μg/L Bromochloro- methane, water, unfiltered, recoverable, μg/L Bromodi- chlorometh- ane, water, unfiltered, recoverable, μg/L Bromoethene, water, unfiltered, recoverable, μg/L Chlorobenzene, water, unfiltered, recoverable, μg/L Chloroethane, water, unfiltered, recoverable, μg/L Chloromethane, water, unfiltered, recoverable, μg/L Chrysene, water, unfiltered, recoverable, μg/L cis-1,2-Dichlo- roethene, water, unfiltered, recoverable, μg/L Dibenzo[a,h] anthracene, water, unfiltered, recoverable, μg/L Dibromoch- lorometh- ane, water, unfiltered, recoverable, μg/L 81555 77297 32101 50002 34301 34311 34418 34320 77093 34556 32105 105–P <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

109–P <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

B–3P <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

B–4 <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

B–5A <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

CMB–2W <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

DT–2 <0.025 <0.06 0.156 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

Manhole 

outflow

<0.025 <0.06 1.58 <0.12 <0.026 <0.06 <0.1 <0.32 <0.025 <0.42 0.16

MB–4W <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

MB–5 <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

MR–100P <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

MR–100PA <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

MR–121 <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

MR–123P <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

TB–10 <0.025 <0.06 0.221 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

TB–11B <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

TB–12 <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

TB–13 <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

TB–14D <0.025 <0.06 0.178 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

TB–15 <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

TB–15 <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

TB–17D <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

TB–17S <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

TB–18D <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12

TB–1D <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1

— <0.025

— <0.12
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 73

Local well 

name

Bromobenzene, 

water, 

unfiltered, 

recoverable, 

μg/L

Bromochloromethane, 

water, 

unfiltered, 

recoverable, 

μg/L

Bromodichloromethane, water, 

unfiltered, 

recoverable, 

μg/L

Bromoethene, 

water, 

unfiltered, 

recoverable, 

μg/L

Chlorobenzene, 

water, 

unfiltered, 

recoverable, 

μg/L

Chloroethane, 

water, 

unfiltered, 

recoverable, 

μg/L

Chloromethane, 

water, 

unfiltered, 

recoverable, 

μg/L

Chrysene, 

water, 

unfiltered, 

recoverable, 

μg/L

cis-1,2-Dichloroethene, 

water, 

unfiltered, 

recoverable, 

μg/L

Dibenzo[a,h]

anthracene, 

water, 

unfiltered, 

recoverable, 

μg/L

Dibromochloromethane, water, 

unfiltered, 

recoverable, 

μg/L

81555 77297 32101 50002 34301 34311 34418 34320 77093 34556 32105

TB–1S <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1 — <0.025 — <0.12TB–2D <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1 — <0.025 — <0.12TB–3D <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1 — <0.025 — <0.12TB–4D <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1 — <0.025 — <0.12TB–4S <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1 — <0.025 — <0.12TB–5D <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1 — <0.025 — <0.12TB–5S <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1 — <0.025 — <0.12TB–8 <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1 — <0.025 — <0.12TB–9 <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1 — <0.025 — <0.12WE–5078 <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1 — <0.025 — <0.12WE–5079 <0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1 — <0.025 — <0.12East Basin <0.025 <0.06 6.69 <0.12 <0.026 <0.06 <0.1 — <0.025 — 0.47East Basin <0.025 <0.06 6.46 <0.12 <0.026 <0.06 <0.1 — <0.025 — 0.45Seep E <0.025 <0.06 0.357 <0.12 <0.026 <0.06 <0.1 — <0.025 — <0.12Equipment 

blank

<0.025 <0.06 <0.034 <0.12 <0.026 <0.06 <0.1 — <0.025 — <0.12

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

74 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Dibromometh- ane, water, unfiltered, recoverable, μg/L Dichlorodi- fluorometh- ane, water, unfiltered, recoverable, μg/L Dichlorometh- ane, water, unfiltered, recoverable, μg/L Diethyl ether, water, unfiltered, recoverable, μg/L Diethyl phthal- ate, water, unfiltered, recoverable, μg/L Diisopropyl ether, water, unfiltered, recoverable, μg/L Dimethyl phthalate, water, unfiltered, recoverable, μg/L Di-n-butyl phthalate, water, unfiltered, recoverable, μg/L Di-n-octyl phthalate, water, unfiltered, recoverable, μg/L Ethyl methac- rylate, water, unfiltered, recoverable, μg/L Ethylbenzene, water, unfiltered, recoverable, μg/L 30217 34668 34423 81576 34336 81577 34341 39110 34596 73570 34371 105–P <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

109–P <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

B–3P <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

B–4 <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

B–5A <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

CMB–2W <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

DT–2 <0.050 <0.10 0.07 <0.1

— <0.06

—

—

— <0.20 <0.036

Manhole 

outflow

<0.050 <0.10 <0.04 <0.1 <0.62 <0.06 <0.36 <2.80 <0.6 <0.20 <0.036

MB–4W <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

MB–5 <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

MR–100P <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

MR–100PA <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

MR–121 <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

MR–123P <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

TB–10 <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

TB–11B <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

TB–12 <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

TB–13 <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

TB–14D <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

TB–15 <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

TB–15 <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

TB–17D <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

TB–17S <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

TB–18D <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036

TB–1D <0.050 <0.10 <0.04 <0.1

— <0.06

—

—

— <0.20 <0.036
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 75

Local well 

name

Dibromomethane, water, 

unfiltered, 

recoverable, 

μg/L

Dichlorodifluoromethane, water, 

unfiltered, 

recoverable, 

μg/L

Dichloromethane, water, 

unfiltered, 

recoverable, 

μg/L

Diethyl ether, 

water, 

unfiltered, 

recoverable, 

μg/L

Diethyl phthalate, water, 

unfiltered, 

recoverable, 

μg/L

Diisopropyl 

ether, water, 

unfiltered, 

recoverable, 

μg/L

Dimethyl 

phthalate, 

water, 

unfiltered, 

recoverable, 

μg/L

Di-n-butyl 

phthalate, 

water, 

unfiltered, 

recoverable, 

μg/L

Di-n-octyl 

phthalate, 

water, 

unfiltered, 

recoverable, 

μg/L

Ethyl methacrylate, water, 

unfiltered, 

recoverable, 

μg/L

Ethylbenzene, 

water, 

unfiltered, 

recoverable, 

μg/L

30217 34668 34423 81576 34336 81577 34341 39110 34596 73570 34371

TB–1S <0.050 <0.10 <0.04 <0.1 — <0.06 — — — <0.20 <0.036

TB–2D <0.050 <0.10 <0.04 <0.1 — <0.06 — — — <0.20 <0.036TB–3D <0.050 <0.10 <0.04 <0.1 — <0.06 — — — <0.20 <0.036TB–4D <0.050 <0.10 <0.04 <0.1 — <0.06 — — — <0.20 <0.036TB–4S <0.050 <0.10 <0.04 <0.1 — <0.06 — — — <0.20 <0.036TB–5D <0.050 <0.10 <0.04 <0.1 — <0.06 — — — <0.20 <0.036TB–5S <0.050 <0.10 <0.04 <0.1 — <0.06 — — — <0.20 <0.036TB–8 <0.050 <0.10 <0.04 <0.1 — <0.06 — — — <0.20 <0.036TB–9 <0.050 <0.10 <0.04 <0.1 — <0.06 — — — <0.20 <0.036WE–5078 <0.050 <0.10 <0.04 <0.1 — <0.06 — — — <0.20 <0.036WE–5079 <0.050 <0.10 <0.04 <0.1 — <0.06 — — — <0.20 <0.036East Basin <0.050 <0.10 <0.04 <0.1 — <0.06 — — — <0.20 <0.036East Basin <0.050 <0.10 <0.04 <0.1 — <0.06 — — — <0.20 <0.036Seep E <0.050 <0.10 <0.04 <0.1 — <0.06 — — — <0.20 <0.036Equipment 

blank

<0.050 <0.10 <0.04 <0.1 — <0.06 — — — <0.20 <0.036

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

76 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Fluoranthene, water, unfiltered, recoverable, μg/L Hexachlorobu- tadiene, water, unfiltered, recoverable, μg/L Hexachloro- cyclopenta- diene, water, unfiltered, recoverable, μg/L Hexachloro- ethane, water, unfiltered, recoverable, μg/L Indeno[1,2,3- cd]pyrene, water, unfiltered, recoverable, μg/L Isobutyl methyl ketone, water, unfiltered, recoverable, μg/L Isophorone, water, unfiltered, recoverable, μg/L Isopropylben- zene, water, unfiltered, recoverable, μg/L Methyl acry- late, water, unfiltered, recoverable, μg/L Methyl acrylo- nitrile, water, unfiltered, recoverable, μg/L Methyl ethyl ketone, water, unfiltered, recoverable, μg/L 34376 39702 34386 34396 34403 78133 34408 77223 49991 81593 81595 105–P

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

109–P

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

B–3P

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

B–4

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

B–5A

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

CMB–2W

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

DT–2

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

Manhole 

outflow

<0.30 <0.08 <0.50 <0.12 <0.38 <0.32 <0.26 <0.042 <0.8 <0.26 <1.6

MB–4W

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

MB–5

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

MR–100P

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 2

MR–100PA

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

MR–121

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

MR–123P

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

TB–10

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

TB–11B

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

TB–12

— <0.08

— <0.12

— <0.32

— 0.012 <0.8 <0.26 <1.6

TB–13

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

TB–14D

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

TB–15

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

TB–15

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

TB–17D

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

TB–17S

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

TB–18D

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6

TB–1D

— <0.08

— <0.12

— <0.32

— <0.042 <0.8 <0.26 <1.6
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 77

Local well 

name

Fluoranthene, 

water, 

unfiltered, 

recoverable, 

μg/L

Hexachlorobutadiene, water, 

unfiltered, 

recoverable, 

μg/L

Hexachlorocyclopentadiene, water, 

unfiltered, 

recoverable, 

μg/L

Hexachloroethane, water, 

unfiltered, 

recoverable, 

μg/L

Indeno[1,2,3-

cd]pyrene, 

water, 

unfiltered, 

recoverable, 

μg/L

Isobutyl methyl 

ketone, water, 

unfiltered, 

recoverable, 

μg/L

Isophorone, 

water, 

unfiltered, 

recoverable, 

μg/L

Isopropylbenzene, water, 

unfiltered, 

recoverable, 

μg/L

Methyl acrylate, water, 

unfiltered, 

recoverable, 

μg/L

Methyl acrylonitrile, water, 

unfiltered, 

recoverable, 

μg/L

Methyl ethyl 

ketone, water, 

unfiltered, 

recoverable, 

μg/L

34376 39702 34386 34396 34403 78133 34408 77223 49991 81593 81595

TB–1S — <0.08 — <0.12 — <0.32 — <0.042 <0.8 <0.26 <1.6TB–2D — <0.08 — <0.12 — <0.32 — <0.042 <0.8 <0.26 <1.6TB–3D — <0.08 — <0.12 — <0.32 — <0.042 <0.8 <0.26 <1.6TB–4D — <0.08 — <0.12 — <0.32 — <0.042 <0.8 <0.26 <1.6TB–4S — <0.08 — <0.12 — <0.32 — <0.042 <0.8 <0.26 <1.6TB–5D — <0.08 — <0.12 — <0.32 — <0.042 <0.8 <0.26 <1.6TB–5S — <0.08 — <0.12 — <0.32 — <0.042 <0.8 <0.26 <1.6TB–8 — <0.08 — <0.12 — <0.32 — <0.042 <0.8 <0.26 <1.6TB–9 — <0.08 — <0.12 — <0.32 — <0.042 <0.8 <0.26 <1.6WE–5078 — <0.08 — <0.12 — <0.32 — <0.042 <0.8 <0.26 <1.6WE–5079 — <0.08 — <0.12 — <0.32 — <0.042 <0.8 <0.26 <1.6East Basin — <0.08 — <0.12 — <0.32 — <0.042 <0.8 <0.26 <1.6East Basin — <0.08 — <0.12 — <0.32 — <0.042 <0.8 <0.26 <1.6Seep E — <0.08 — <0.12 — <0.32 — <0.042 <0.8 <0.26 <1.6Equipment 

blank

— <0.08 — <0.12 — <0.32 — <0.042 <0.8 <0.26 <1.6

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

78 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Methyl meth- acrylate, water, unfiltered, recoverable, μg/L Methyl tert- butyl ether, water, unfiltered, recoverable, μg/L Methyl tert-pentyl ether, water, unfiltered, recoverable, μg/L Methylene blue active sub- stances, water, unfiltered, recoverable, mg/L m-Xylene plus p-xylene, water, unfiltered, recoverable, μg/L Naphthalene, water, unfiltered, recoverable, μg/L n-Butyl methyl ketone, water, unfiltered, recoverable, μg/L n-Butylben- zene, water, unfiltered, recoverable, μg/L Nitrobenzene, water, unfiltered, recoverable, μg/L N-Nitrosodi- methylamine, water, unfiltered, recoverable, μg/L N-Nitrosodi-n- propylamine, water, unfiltered, recoverable, μg/L 81597 78032 50005 38260 85795 34696 77103 77342 34447 34438 34428 105–P <0.30 <0.10 <0.06 <0.500 <0.08 <0.18 <0.6 <0.08

—

—

—

109–P <0.30 <0.10 <0.06 0.252 <0.08 <0.18 <0.6 <0.08

—

—

—

B–3P <0.30 <0.10 <0.06 0.645 <0.08 <0.18 <0.6 <0.08

—

—

—

B–4 <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08

—

—

—

B–5A <0.30 <0.10 <0.06 0.159 <0.08 <0.18 <0.6 <0.08

—

—

—

CMB–2W <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08

—

—

—

DT–2 <0.30 <0.10 <0.06 0.158 <0.08 <0.18 <0.6 <0.08

—

—

—

Manhole 

outflow

<0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08 <0.26 <1.02 <0.4

MB–4W <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08

—

—

—

MB–5 <0.30 <0.10 <0.06 0.123 <0.08 <0.18 <0.6 <0.08

—

—

—

MR–100P <0.30 <0.10 <0.06 <0.500 <0.08 <0.18 <0.6 <0.08

—

—

—

MR–100PA <0.30 <0.10 <0.06 0.488 <0.08 <0.18 <0.6 <0.08

—

—

—

MR–121 <0.30 <0.10 <0.06 <0.500 <0.08 <0.18 <0.6 <0.08

—

—

—

MR–123P <0.30 <0.10 <0.06 0.59 <0.08 <0.18 <0.6 <0.08

—

—

—

TB–10 <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08

—

—

—

TB–11B <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08

—

—

—

TB–12 <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08

—

—

—

TB–13 <0.30 <0.10 <0.06 <0.500 <0.08 <0.18 <0.6 <0.08

—

—

—

TB–14D <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08

—

—

—

TB–15 <0.30 <0.10 <0.06 <0.250 <0.08 <0.18 <0.6 <0.08

—

—

—

TB–15 <0.30 <0.10 <0.06 <0.500 <0.08 <0.18 <0.6 <0.08

—

—

—

TB–17D <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08

—

—

—

TB–17S <0.30 <0.10 <0.06 <0.500 <0.08 <0.18 <0.6 <0.08

—

—

—

TB–18D <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08

—

—

—

TB–1D <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08

—

—

—
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 79

Local well 

name

Methyl methacrylate, 

water, 

unfiltered, 

recoverable, 

μg/L

Methyl tertbutyl ether, 

water, 

unfiltered, 

recoverable, 

μg/L

Methyl 

tert-pentyl 

ether, water, 

unfiltered, 

recoverable, 

μg/L

Methylene blue 

active substances, water, 

unfiltered, 

recoverable, 

mg/L

m-Xylene plus 

p-xylene, 

water, 

unfiltered, 

recoverable, 

μg/L

Naphthalene, 

water, 

unfiltered, 

recoverable, 

μg/L

n-Butyl methyl 

ketone, water, 

unfiltered, 

recoverable, 

μg/L

n-Butylbenzene, water, 

unfiltered, 

recoverable, 

μg/L

Nitrobenzene, 

water, 

unfiltered, 

recoverable, 

μg/L

N-Nitrosodimethylamine, 

water, 

unfiltered, 

recoverable, 

μg/L

N-Nitrosodi-npropylamine, 

water, 

unfiltered, 

recoverable, 

μg/L

81597 78032 50005 38260 85795 34696 77103 77342 34447 34438 34428

TB–1S <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08 — — —TB–2D <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08 — — —TB–3D <0.30 <0.10 <0.06 1.17 <0.08 <0.18 <0.6 <0.08 — — —TB–4D <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08 — — —TB–4S <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08 — — —TB–5D <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08 — — —TB–5S <0.30 <0.10 <0.06 <0.835 <0.08 <0.18 <0.6 <0.08 — — —TB–8 <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08 — — —TB–9 <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08 — — —WE–5078 <0.30 <0.10 <0.06 0.074 <0.08 <0.18 <0.6 <0.08 — — —WE–5079 <0.30 <0.10 <0.06 0.122 <0.08 <0.18 <0.6 <0.08 — — —East Basin <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08 — — —East Basin <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08 — — —Seep E <0.30 <0.10 <0.06 <0.050 <0.08 <0.18 <0.6 <0.08 — — —Equipment 

blank

<0.30 <0.10 <0.06 — <0.08 <0.18 <0.6 <0.08 — — —

Equipment 

blank

— — — <0.050 — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

80 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name N-Nitrosodi- phenylamine, water, unfiltered, recoverable, μg/L n-Propylben- zene, water, unfiltered, recoverable, μg/L o-Xylene, water, unfiltered, recoverable, μg/L Phenanthrene, water, unfiltered, recoverable, μg/L Phenol, water, unfiltered, recoverable, μg/L Pyrene, water, unfiltered, recoverable, μg/L sec-Butylben- zene, water, unfiltered, recoverable, μg/L Styrene, water, unfiltered, recoverable, μg/L tert-Butyl ethyl ether, water, unfiltered, recoverable, μg/L tert-Butylben- zene, water, unfiltered, recoverable, μg/L Tetrachloro- ethene, water, unfiltered, recoverable, μg/L 34433 77224 77135 34461 34694 34469 77350 77128 50004 77353 34475 105–P

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

109–P

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

B–3P

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

B–4

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

B–5A

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

CMB–2W

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

DT–2

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

Manhole 

outflow

<0.48 <0.036 <0.032 <0.32 0.42 <0.36 <0.034 <0.042 <0.032 <0.060 <0.026

MB–4W

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

MB–5

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

MR–100P

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

MR–100PA

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

MR–121

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

MR–123P

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

TB–10

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

TB–11B

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

TB–12

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

TB–13

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

TB–14D

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

TB–15

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

TB–15

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

TB–17D

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

TB–17S

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

TB–18D

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026

TB–1D

— <0.036 <0.032

—

—

— <0.034 <0.042 <0.032 <0.060 <0.026
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 81

Local well 

name

N-Nitrosodiphenylamine, 

water, 

unfiltered, 

recoverable, 

μg/L

n-Propylbenzene, water, 

unfiltered, 

recoverable, 

μg/L

o-Xylene, 

water, 

unfiltered, 

recoverable, 

μg/L

Phenanthrene, 

water, 

unfiltered, 

recoverable, 

μg/L

Phenol, 

water, 

unfiltered, 

recoverable, 

μg/L

Pyrene, 

water, 

unfiltered, 

recoverable, 

μg/L

sec-Butylbenzene, water, 

unfiltered, 

recoverable, 

μg/L

Styrene, 

water, 

unfiltered, 

recoverable, 

μg/L

tert-Butyl ethyl 

ether, water, 

unfiltered, 

recoverable, 

μg/L

tert-Butylbenzene, water, 

unfiltered, 

recoverable, 

μg/L

Tetrachloroethene, water, 

unfiltered, 

recoverable, 

μg/L

34433 77224 77135 34461 34694 34469 77350 77128 50004 77353 34475

TB–1S — <0.036 <0.032 — — — <0.034 <0.042 <0.032 <0.060 <0.026TB–2D — <0.036 <0.032 — — — <0.034 <0.042 <0.032 <0.060 <0.026TB–3D — <0.036 <0.032 — — — <0.034 0.036 <0.032 <0.060 <0.026TB–4D — <0.036 <0.032 — — — <0.034 <0.042 <0.032 <0.060 <0.026TB–4S — <0.036 <0.032 — — — <0.034 <0.042 <0.032 <0.060 <0.026TB–5D — <0.036 <0.032 — — — <0.034 <0.042 <0.032 <0.060 <0.026TB–5S — <0.036 <0.032 — — — <0.034 <0.042 <0.032 <0.060 <0.026TB–8 — <0.036 <0.032 — — — <0.034 <0.042 <0.032 <0.060 <0.026TB–9 — <0.036 <0.032 — — — <0.034 <0.042 <0.032 <0.060 <0.026WE–5078 — <0.036 <0.032 — — — <0.034 <0.042 <0.032 <0.060 <0.026WE–5079 — <0.036 <0.032 — — — <0.034 <0.042 <0.032 <0.060 <0.026East Basin — <0.036 <0.032 — — — <0.034 <0.042 <0.032 <0.060 <0.026East Basin — <0.036 <0.032 — — — <0.034 <0.042 <0.032 <0.060 <0.026Seep E — <0.036 <0.032 — — — <0.034 <0.042 <0.032 <0.060 <0.026Equipment 

blank

— <0.036 <0.032 — — — <0.034 <0.042 <0.032 <0.060 <0.026

Equipment 

blank

— — — — — — — — — — —
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

82 Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015 Local well name Tetrachlo- romethane, water, unfiltered, recoverable, μg/L Tetrahydro- furan, water, unfiltered, recoverable, μg/L Toluene, water, unfiltered, recoverable, μg/L trans-1,2- Dichloroeth- ene, water, unfiltered, recoverable, μg/L trans-1,4-Di- chloro-2-bu- tene, water, unfiltered, recoverable, μg/L Tribromo- methane, water, unfiltered, recoverable, μg/L Trichloroeth- ene, water, unfiltered, recoverable, μg/L Trichloro- fluorometh- ane, water, unfiltered, recoverable, μg/L Trichloro- methane, water, unfiltered, recoverable, μg/L Vinyl chlo- ride, water, unfiltered, recoverable, μg/L Suspended sediment, sieve diameter, percent small- er than 0.0625 millimeters Suspended sediment concentration, mg/L 32102 81607 34010 34546 73547 32104 39180 34488 32106 39175 70331 80154 105–P <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 <0.03 <0.06

—

—

109–P <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 12.9 <0.06

—

—

B–3P <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 <0.03 <0.06

—

—

B–4 <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 14.9 <0.06

—

—

B–5A <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 10.3 <0.06

—

—

CMB–2W <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 <0.03 <0.06

—

—

DT–2 <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 20.7 <0.06

—

—

Manhole 

outflow

<0.06 <1.4 0.03 <0.025 <2.0 <0.10 <0.025 <0.06 5 <0.06

—

—

MB–4W <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 29.6 <0.06

—

—

MB–5 <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 0.05 <0.06

—

—

MR–100P <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 <0.03 <0.06

—

—

MR–100PA <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 38.9 <0.06

—

—

MR–121 <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 18.9 <0.06

—

—

MR–123P <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 6.8 <0.06

—

—

TB–10 <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 2.8 <0.06

—

—

TB–11B <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 20.1 <0.06

—

—

TB–12 <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 0.63 <0.06

—

—

TB–13 <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 3 <0.06

—

—

TB–14D <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 4.4 <0.06

—

—

TB–15 <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 19.5 <0.06

—

—

TB–15 <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 19.9 <0.06

—

—

TB–17D <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 0.58 <0.06

—

—

TB–17S <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 15.2 <0.06

—

—

TB–18D <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 19.8 <0.06

—

—

TB–1D <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 54.4 <0.06

—

—
Table 2. Concentrations of detected constituents in water samples collected from the Hillview Reservoir in Westchester County, New York, in 2015.—Continued

[Location of sites shown in figures 1 and 2. Five-digit number below analyte description is a National Water Information System parameter code (USGS, 2011). USGS, U.S. Geological Survey; mg/L, milligrams per liter; μS/cm at 25 °C, microsiemens per centimeter at 25 degrees Celsius; QA, quality assurance; E, estimated; <, less than; nm, nanometer; NTRU, nephelometric turbidity ratio unit; SiO2, silicon dioxide; μg/L, micrograms per liter; ng/L, nanograms per liter; EPTC, S-ethyl dipropylthiocarbamate; DCPA, dimethyl tetrachloroterephthalate; —, no data]

Table 2 83

Local well 

name

Tetrachloromethane, 

water, 

unfiltered, 

recoverable, 

μg/L

Tetrahydrofuran, water, 

unfiltered, 

recoverable, 

μg/L

Toluene, 

water, 

unfiltered, 

recoverable, 

μg/L

trans-1,2-

Dichloroethene, water, 

unfiltered, 

recoverable, 

μg/L

trans-1,4-Dichloro-2-butene, water, 

unfiltered, 

recoverable, 

μg/L

Tribromomethane, 

water, 

unfiltered, 

recoverable, 

μg/L

Trichloroethene, water, 

unfiltered, 

recoverable, 

μg/L

Trichlorofluoromethane, water, 

unfiltered, 

recoverable, 

μg/L

Trichloromethane, 

water, 

unfiltered, 

recoverable, 

μg/L

Vinyl chloride, water, 

unfiltered, 

recoverable, 

μg/L

Suspended 

sediment, 

sieve diameter, 

percent smaller than 0.0625 

millimeters

Suspended 

sediment 

concentration, 

mg/L

32102 81607 34010 34546 73547 32104 39180 34488 32106 39175 70331 80154

TB–1S <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 <0.03 <0.06 — —

TB–2D <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 48.1 <0.06 — —TB–3D <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 0.08 <0.06 — —TB–4D <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 50.5 <0.06 — —TB–4S <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 50.3 <0.06 — —TB–5D <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 13 <0.06 — —TB–5S <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 9.5 <0.06 — —TB–8 <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 36.1 <0.06 — —TB–9 <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 16 <0.06 — —WE–5078 <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 <0.03 <0.06 — —WE–5079 <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 3.8 <0.06 — —East Basin <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 37.6 <0.06 — —East Basin <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 38 <0.06 — —Seep E <0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 6.6 <0.06 — —Equipment 

blank

<0.06 <1.4 <0.03 <0.025 <2.0 <0.10 <0.025 <0.06 <0.03 <0.06 — —

Equipment 

blank

— — — — — — — — — — — —

1 Indicates open-top bailer was the sampler type.2 Indicates submersible pump was the sampler type.3 Indicates replicate sampler was the type of quality assurance data associated with sample.

For more information about this report, contact:

Director, New York Water Science Center

U.S. Geological Survey

2045 Route 112, Building 4

Coram, NY 11727

dc_ny@usgs.gov

(518) 285–5602

or visit our website at

https://ny.water.usgs.gov

Publishing support provided by the 

Pembroke Publishing Service Center
Chu and Noll—Water-Quality Data From an Earthen Dam Site in Southern Westchester County, New York, 2015—Data Series 1057

Printed on recycled paper

ISSN 2327-0271 (print)

ISSN 2327–638X (online)

https://doi.org/10.3133/ds1057