![](media/image1.jpeg){width="2.654166666666667in"
height="0.6423611111111112in"}

**Brookhaven National Laboratory**

**Service Station Facility**

**Facility Environmental Monitoring Report**

**Calendar Year 2000**

![](media/image2.png){width="2.1333333333333333in"
height="0.7909722222222222in"}

##### April 10, 2001

Prepared by:

D. Paquette

##### Environmental Services Division

###### 

###### GW72ER.01

##### **Brookhaven National Laboratory**

##### **Service Station Facility**

##### **Facility Environmental Monitoring Report**

**Calendar Year 2000**

***Summary of Results**: During CY 2000, high levels of carbon
tetrachloride (up to 4,000 μg/L) were detected in a number of wells
located upgradient and downgradient of the Service Station. The carbon
tetrachloride was released from a former underground storage tank that
was used for a Chemistry Department experiment in the 1950s. This tank
was located approximately 200 feet northwest (upgradient) of the
station. Petroleum hydrocarbons (e.g., xylenes and ethylbenzene) and the
solvent tetrachloroethylene were detected in several newly installed
monitoring wells located directly downgradient of the station. An
evaluation of current operations indicates that the Service Station's
underground storage tanks and associated distribution lines are not
leaking and that all waste oils and used solvents are being properly
stored and recycled. Therefore, it is believed that the petroleum
hydrocarbon related compounds and solvents detected in groundwater
originate from historical vehicle maintenance and fuel dispensing
operations prior to improved chemical storage and handling controls
implemented in 1989.*

###### Background

Building 630 is a commercial automobile service station, which is
privately operated under a contract with BNL. The station, which was
built in 1966, is used for automobile repair and gasoline sales.

Potential environmental concerns at the Service Station include the
historical use of underground storage tanks (USTs) for the storage of
gasoline and waste oil, hydraulic fluids used for lift stations, and the
use of solvents for parts cleaning. When the service station was built
in 1966, the UST inventory consisted of two 8,000 gallon-capacity and
one 6,000 gallon-capacity tanks for the storage of gasoline, and one 500
gallon-capacity tank for used motor oil. An inventory discrepancy
discovered in 1967, suggested that up to 8,000 gallons of gasoline might
have leaked from one of the USTs. There are no records of remedial
actions other than the replacement of the tank. In August 1989, the
USTs, pump islands and associated piping were upgraded to conform to
Suffolk County Article 12 requirements for secondary containment, leak
detection devices and overfill alarms. During the removal of the old
USTs, there were no obvious signs of soil contamination.

The present tank inventory includes three 8,000 gallon-capacity USTs
used for the storage of unleaded gasoline, and one 500 gallon-capacity
UST used for waste oil. The facility also has three vehicle lift
stations.

###### Environmental Monitoring Program

In 1996, BNL established a groundwater monitoring program at the Service
Station to evaluate potential impacts to environmental quality and to
demonstrate compliance with DOE requirements and applicable federal,
state and local laws, and regulations. The environmental monitoring
program for the Service Station is described in the BNL Environmental
Monitoring Plan (Daum *et al*. 2000; BNL, 2001).

###### 

###### Monitoring Results

**Groundwater**

The Service Station's groundwater monitoring program is designed to
confirm that the engineered and institutional controls in place are
effective in preventing contamination of the aquifer. Five wells are
used to monitor for potential contaminant releases (Figure 1). Three of
these wells (085-235, 085-236 and 085-237) were installed in January
2000 to improve BNL's ability to monitor the quality of groundwater in
this area.

Groundwater quality in the Service Station area has been impacted by
historical small-scale spills of oils, gasoline, and solvents, and by
carbon tetrachloride contamination associated with a nearby underground
storage tank that was used to store carbon tetrachloride as part of an
experiment conducted in the 1950s. In April 1998, BNL removed an
underground storage tank from an area located approximately 200 feet to
the northwest (upgradient) of the Service Station. Although there are
indications that the tank was releasing small quantities of carbon
tetrachloride prior to the tank removal, the detection of a significant
increase in carbon tetrachloride concentrations in groundwater suggests
that additional amounts of this chemical were inadvertently released
during the excavation and removal process. This release is currently
being remediated as part of the Environmental Restoration program.

Prior to 1999, low levels (\<20 μg/L) of carbon tetrachloride were
detected in Service Station Well 085-17. Following the April 1998 carbon
tetrachloride tank removal, higher levels of carbon tetrachloride
started to be detected in Service Station area wells. In 1999, carbon
tetrachloride concentrations in Well 085-17 increased to 503 μg/L, and
by January 2000 carbon tetrachloride concentrations reached 2,000 μg/L.
By June 2000, carbon tetrachloride concentrations in Well 085-17
increased to 4,400 μg/L (Figure 2). The New York State Ambient Water
Quality Standard (NYS AWQS) for carbon tetrachloride is 5 μg/L. BNL
started to remediate the carbon tetrachloride plume in October 1999.
Following the detection of very high levels of carbon tetrachloride in
January 2000, the Service Station area wells were incorporated into the
Environmental Restoration program's carbon tetrachloride plume
monitoring program, and placed on a monthly sampling schedule (Tables 2
through 9).

Petroleum hydrocarbon-related compounds were detected in two of the new
wells (Wells 085-236 and 085-237) installed in January 2000 directly
downgradient of the Service Station (Tables 1 through 9). These
compounds are not detected in upgradient wells. Therefore, the source of
the contamination is located close to or beneath the Service Station. No
floating petroleum was detected in the monitoring wells.

Primary petroleum hydrocarbon related compounds detected in samples
collected from Wells 085-236 and 085-237 during January-May 2000
include: xylenes (up to 420 μg/L), ethylbenzene (up to 77 μg/L),
1,2,4-trimethylbenzene (up to 47 μg/L), 1,3,5-trimethylbenzene (up to 31
μg/L), and naphthalene (up to 32 μg/L). Trace amounts of the gasoline
additive MTBE (\<5 μg/L) were detected in downgradient Wells 085-236 and
085-237. This compound was also detected in a sample from upgradient
Well 085-235. (Note: MTBE has been in use as a gasoline additive since
1977.) Tetrachloroethylene (up to 37 μg/L) was also detected in a number
of Service Station area wells, and is probably related to historical
degreasing operations. In June 2000, BNL implemented the Groundwater
Contingency Plan and formed a technical team to identify the source of
the contamination (see discussion below).

During the period of June through October 2000, concentrations of
petroleum hydrocarbon-related compounds in samples collected from Well
085-236 and 085-237 decreased to nearly non-detectable levels. During
this same period however, levels of petroleum hydrocarbon related
compounds increased in Well 085-17 from near non-detectable levels to
concentrations well above NYS AWQS. By October 2000, samples from Well
085-17 had total xylene concentrations of 120 μg/L,
1,2,4-trimethylbenzene concentrations at 21.6 μg/L,
1,3,5-trimethylbenzene at 12.7 μg/L, and naphthalene at 4.0 μg/L. The
shift in the detection of petroleum hydrocarbon related contaminants
from Well 085-236 to Well 085-17 corresponds to a change in groundwater
flow direction from southeast to south that began in June-July 2000.
This change in flow direction was caused by the operation of the nearby
carbon tetrachloride extraction wells.

In April 2000, the Environmental Restoration program installed two
additional wells (085-238 and 095-183) approximately 200 feet
downgradient of the Service Station in an effort to better characterize
the extent of carbon tetrachloride contamination. Results from the
initial sampling of these wells in early June indicated carbon
tetrachloride up to 2,080 μg/L and tetrachloroethylene up to 12.6 μg/L.
The lack of petroleum hydrocarbon compounds at this distance away from
the Service Station is consistent with the findings of numerous studies
on petroleum hydrocarbon spills, where it has been found that compounds
such as xylenes, ethylbenzene, 1,2,4-trimethylbenzene, and naphthalene
degrade rapidly and, therefore, do not migrate great distances from
source areas.

**Evaluation of Current Operations**

Following the discovery of petroleum hydrocarbon related chemicals in
monitoring wells located downgradient of the Service Station, BNL
conducted an investigation into the current operations of the station.
The investigation found that the contamination is not related to current
operations. Based upon an evaluation of the electronic leak detection
system monitoring and daily product reconciliation (i.e., an accounting
of the volume of gasoline stored in underground storage tanks and volume
of gasoline sold), there are no indications that the underground storage
tanks or associated piping are leaking. Furthermore, if the contaminants
were related to a recent (significant) gasoline spill, it would be
expected that groundwater samples would indicate high levels of benzene,
toluene and the gasoline additive MTBE. The investigation also found
that all waste oils and used solvents generated from current operations
are being properly stored and recycled (Sack, 2000).

The Service Station was constructed with a number of floor drains that
drained to an oil/water separator prior to discharge to the BNL Sanitary
System. Although the floor drains were sealed in 1990, the oil/water
separator was not abandoned at that time. As part of the June 2000
investigation, the oil/water separator was inspected and found filled
with a lightweight oil/solvent. The fact that the oil/water separator
remained full after ten years after the sealing of the floor drains
indicates that that portion of the drain system was not leaking. The
integrity of the remaining portion of the floor drain system during its
time of operation (i.e., 1966-1990) cannot be determined using currently
available information.

The oil/water separator was pumped out on July 6, 2000. Approximately 55
gallons of liquid and two drums of soil/sludge were removed from the
oil/water separator. The liquid and sludge were analyzed for hazardous
waste characteristics to determine the appropriate means of disposal.
Analytical results indicated high levels of halogenated and aromatic
compounds (Zimmerman, 2000). A soil sample was taken adjacent to the
separator to assess any leakage from the separator into the ground.
Analysis of the sample indicated low-level petroleum hydrocarbon
contamination, but at concentrations well below Suffolk County Action
Levels (Zimmerman, 2000). BNL has proposed abandoning the oil/water
separator in-place by filling the device with sand and concrete.
Regulatory agency approval for this action is pending.

**Future Monitoring Actions**

The following actions are recommended for the CY 2001 monitoring period:

-   Maintain the groundwater monitoring program on its current
    semiannual schedule.

-   The Environmental Restoration program will evaluate the full extent
    of carbon tetrachloride plume migration and determine whether there
    is a need to expand the groundwater treatment system.

**References**

BNL, 2001. *Brookhaven National Laboratory Environmental Monitoring
Plan, CY 2001 Update* (January 2001). BNL-52584 Update.

Daum, M., Dorsch, W., Fry, J., Green, T., Lee, R., Naidu, J., Paquette,
D., Scarpitta, S., and Schroeder, G., 2000. *Brookhaven National
Laboratory, Environmental Monitoring Plan 2000* (March 31, 2000).

Sack, B., 2000. Memo from B. Sack to T. Sheridan, *Groundwater
Contamination at Building 630 -- On-Site Gas Station* (July 11, 2000).

Zimmerman, E.A., 2000. Letter from E.A. Zimmerman to F. Crescenso,
*Analytical Data for Soil Samples Collected from the Building 630
Oil/Water Separator* (November 29, 2000).

**BNL Facility Environmental Monitoring Report**

**Service Station Facility**

**Groundwater Monitoring Program**

**Volatile Organic Compound Analytical Results for January 28 - February
7, 2000**

**Table 1**

+----------------+------+----------+----------+----------+----------+
| **Compound**   | *    | **Well   | **Well   | **Well   | **Well   |
|                | *NYS | 085-235  | 0        | 085-236  | 0        |
|                | AW   | (b)**    | 85-017** | (b)**    | 85-237** |
|                | QS** |          |          |          |          |
|                |      | **       | **       | **       | **       |
|                | **   | (μg/L)** | (μg/L)** | (μg/L)** | (μg/L)** |
|                | (μg/ |          |          |          |          |
|                | L)** |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Carbon         | 5    | 990.0    | 2,140.0  | 122D     | 752      |
| tetrachloride  |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Methylene      | 5    | \<0.5    | 0.6B     | 0.6      | \<0.5    |
| chloride\*\*   |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Chloroform\*\* | 7    | 10.4     | 7.4      | 7.5      | 5.1      |
+----------------+------+----------+----------+----------+----------+
| Toluene        | 5    | \<0.5    | \<0.5    | 2.7      | \<0.5    |
+----------------+------+----------+----------+----------+----------+
| Tetra          | 5    | 2.2      | 4.6      | 23.7     | 20.8     |
| chloroethylene |      |          |          |          |          |
| (PCE)          |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Ethylbenzene   | 5    | \<0.5    | \<0.5    | 11.7     | 1.7      |
+----------------+------+----------+----------+----------+----------+
| m,p-Xylenes    | 5    | \<0.5    | \<0.5    | 31.3     | 34.9     |
+----------------+------+----------+----------+----------+----------+
| o-Xylene       | 5    | \<0.5    | \<0.5    | 77.8     | 44.7     |
+----------------+------+----------+----------+----------+----------+
| Is             | 5    | \<0.5    | \<0.5    | \<0.5    | \<0.5    |
| opropylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| n              | 5    | \<0.5    | \<0.5    | 9.0      | \<0.5    |
| -propylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1,3,5-Tr       | 5    | \<0.5    | \<0.5    | 16.8     | 14.9     |
| imethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1,2,4-Tr       | 5    | \<0.5    | \<0.5    | 2.9      | 12.5     |
| imethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Naphthalene    | 10   | \<0.5    | \<0.5    | 13.1     | 3.6      |
+----------------+------+----------+----------+----------+----------+
| Methyl         | 5    | NA       | NA       | NA       | NA       |
| tertiary butyl | 0(a) |          |          |          |          |
| ether (MTBE)   |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Total VOC      | \--  | 1,004    | 2,152    | 642      | 1,075    |
| Concentration  |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+

Note 1: February 2000 groundwater samples collected by BNL Environmental
Restoration Division -- OU III Carbon Tetrachloride Plume Removal
Action.

Note 2: Only primary contaminants shown. Other compounds may have been
detected, but at concentrations generally \< 5 μg/L.

(a): New York State Drinking Water Standard.

(b): Samples from Wells 085-235 and 085-236 were inadvertently
misidentified (i.e., switched) in the field.

B: Compound also detected in blank sample.

J: Estimated analytical value.

D: Analytical value following dilution.

NA: Compound not analyzed for.

\*\*: Primary breakdown products of carbon tetrachloride.

**BNL Facility Environmental Monitoring Report**

**Service Station Facility**

**Groundwater Monitoring Program**

**Volatile Organic Compound Analytical Results for February 23, 2000**

**Table 2**

+----------------+------+----------+----------+----------+----------+
| **Compound**   | *    | **Well   | **Well   | **Well   | **Well   |
|                | *NYS | 0        | 0        | 0        | 0        |
|                | AW   | 85-235** | 85-017** | 85-236** | 85-237** |
|                | QS** |          |          |          |          |
|                |      | **       | **       | **       | **       |
|                | **   | (μg/L)** | (μg/L)** | (μg/L)** | (μg/L)** |
|                | (μg/ |          |          |          |          |
|                | L)** |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Carbon         | 5    | 970 D    | 2,820 D  | 165      | 1,360 D  |
| tetrachloride  |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Methylene      | 5    | 7.6      | 9.9      | 4.6 J    | 10.2     |
| chloride\*\*   |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Chloroform\*\* | 7    | 12.3     | 10.4     | 11.8     | 8.8      |
+----------------+------+----------+----------+----------+----------+
| Toluene        | 5    | \<5      | \<5      | 3.1 J    | \<5      |
+----------------+------+----------+----------+----------+----------+
| Tetra          | 5    | \<5      | 3.2 J    | 22.2     | 18.3     |
| chloroethylene |      |          |          |          |          |
| (PCE)          |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Ethylbenzene   | 5    | \<5      | \<5      | 20.2     | \<5      |
+----------------+------+----------+----------+----------+----------+
| m,p-Xylenes    | 5    | \<5      | \<5      | 85.3     | 24.5     |
+----------------+------+----------+----------+----------+----------+
| o-Xylene       | 5    | \<5      | \<5      | 99.9     | 25.4     |
+----------------+------+----------+----------+----------+----------+
| Is             | 5    | \<5      | \<5      | 7.8      | \<5      |
| opropylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| n              | 5    | \<5      | \<5      | 14       | \<5      |
| -propylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1,3,5-Tr       | 5    | \<5      | \<5      | 30.7     | 12.4     |
| imethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1,2,4-Tr       | 5    | \<5      | \<5      | 17       | 11.7     |
| imethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Naphthalene    | 10   | \<5      | \<5      | 9.0      | \<5      |
+----------------+------+----------+----------+----------+----------+
| Methyl         | 5    | NA       | NA       | NA       | NA       |
| tertiary butyl | 0(a) |          |          |          |          |
| ether (MTBE)   |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Total VOC      | \--  | 989      | 2,843    | 790      | 1,522    |
| Concentration  |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+

Note 1: February 2000 groundwater samples collected by BNL Environmental
Restoration Division -- OU III Carbon Tetrachloride Plume Removal
Action.

Note 2: Only primary contaminants shown. Other compounds may have been
detected, but at concentrations generally \< 5 μg/L.

(a): New York State Drinking Water Standard.

J: Estimated analytical value.

D: Analytical value following dilution.

NA: Compound not analyzed for.

\*\*: Primary breakdown products of carbon tetrachloride.

**BNL Facility Environmental Monitoring Report**

**Service Station Facility**

**Groundwater Monitoring Program**

**Volatile Organic Compound Analytical Results for March 27, 2000**

**Table 3**

+----------------+------+----------+----------+----------+----------+
| **Compound**   | *    | **Well   | **Well   | **Well   | **Well   |
|                | *NYS | 0        | 0        | 0        | 0        |
|                | AW   | 85-235** | 85-017** | 85-236** | 85-237** |
|                | QS** |          |          |          |          |
|                |      | **       | **       | **       | **       |
|                | **   | (μg/L)** | (μg/L)** | (μg/L)** | (μg/L)** |
|                | (μg/ |          |          |          |          |
|                | L)** |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Carbon         | 5    | 780.0 D  | 3,820.0  | 560.0 D  | 3,430.0  |
| tetrachloride  |      |          | D        |          | D        |
+----------------+------+----------+----------+----------+----------+
| Methylene      | 5    | 0.5 B    | 0.6 B    | 1.2 B    | 0.8 B    |
| chloride\*\*   |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Chloroform\*\* | 7    | 7.5      | 10.9     | 17.9     | 13.9     |
+----------------+------+----------+----------+----------+----------+
| Toluene        | 5    | \<0.5    | \<0.5    | 5.6      | \<0.5    |
+----------------+------+----------+----------+----------+----------+
| Tetra          | 5    | 1.5      | 5.6      | 36.3     | 12.3     |
| chloroethylene |      |          |          |          |          |
| (PCE)          |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Ethylbenzene   | 5    | \<0.5    | \<0.5    | 76.8     | \<0.5    |
+----------------+------+----------+----------+----------+----------+
| m,p-Xylenes    | 5    | \<0.5    | \<0.5    | 221 D    | 9.4      |
+----------------+------+----------+----------+----------+----------+
| o-Xylene       | 5    | \<0.5    | \<0.5    | 199 D    | 8.2      |
+----------------+------+----------+----------+----------+----------+
| Is             | 5    | \<0.5    | \<0.5    | 16.2 D   | \<0.5    |
| opropylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| n              | 5    | \<0.5    | \<0.5    | 29.5     | 1.8      |
| -propylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1,3,5-Tr       | 5    | \<0.5    | \<0.5    | \<0.5    | 8.6      |
| imethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1,2,4-Tr       | 5    | \<0.5    | \<0.5    | 46.8     | 16.6     |
| imethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1-Meth         | 5    | \<0.5    | \<0.5    | 16.8     | 1.7      |
| ylethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Naphthalene    | 10   | \<0.5    | \<0.5    | 31.8     | 1.4      |
+----------------+------+----------+----------+----------+----------+
| Methyl         | 5    | NA       | NA       | NA       | NA       |
| tertiary butyl | 0(a) |          |          |          |          |
| ether (MTBE)   |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Total VOC      | \--  | 789      | 3,837    | 1,015    | 3,504    |
| Concentration  |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+

Note 1: March 2000 groundwater samples collected by BNL Environmental
Restoration Division -- OU III Carbon Tetrachloride Plume Removal
Action.

Note 2: Only primary contaminants shown. Other compounds may have been
detected, but at concentrations generally \< 5 μg/L.

(a): New York State Drinking Water Standard.

B: Compound also detected in blank sample.

J: Estimated analytical value.

D: Analytical value following dilution.

NA: Compound not analyzed for.

\*\*: Primary breakdown products of carbon tetrachloride.

**BNL Facility Environmental Monitoring Report**

**Service Station Facility**

**Groundwater Monitoring Program**

**Volatile Organic Compound Analytical Results for April 19, 2000**

**Table 4**

+----------------+------+----------+----------+----------+----------+
| **Compound**   | *    | **Well   | **Well   | **Well   | **Well   |
|                | *NYS | 0        | 0        | 0        | 0        |
|                | AW   | 85-235** | 85-017** | 85-236** | 85-237** |
|                | QS** |          |          |          |          |
|                |      | **       | **       | **       | **       |
|                | **   | (μg/L)** | (μg/L)** | (μg/L)** | (μg/L)** |
|                | (μg/ |          |          |          |          |
|                | L)** |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Carbon         | 5    | 604.0 D  | 2,200.0  | 364.0 D  | 2,170.0  |
| tetrachloride  |      |          | D        |          | D        |
+----------------+------+----------+----------+----------+----------+
| Methylene      | 5    | \<0.5    | \<0.5    | \<0.5    | \<0.5    |
| chloride\*\*   |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Chloroform\*\* | 7    | 8.0      | 15.2     | 25.0     | 13.8     |
+----------------+------+----------+----------+----------+----------+
| Toluene        | 5    | \<0.5    | \<0.5    | 1.4      | \<0.5    |
+----------------+------+----------+----------+----------+----------+
| Tetra          | 5    | 1.4      | 7.7      | 18.7     | 7.9      |
| chloroethylene |      |          |          |          |          |
| (PCE)          |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Ethylbenzene   | 5    | \<0.5    | \<0.5    | 29.6     | \<0.5    |
+----------------+------+----------+----------+----------+----------+
| m,p-Xylenes    | 5    | \<0.5    | \<0.5    | 120.0    | 3.5      |
+----------------+------+----------+----------+----------+----------+
| o-Xylene       | 5    | \<0.5    | \<0.5    | 65.3     | 3.8      |
+----------------+------+----------+----------+----------+----------+
| Is             | 5    | \<0.5    | \<0.5    | \<0.5    | \<0.5    |
| opropylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| n              | 5    | \<0.5    | \<0.5    | 6.2      | \<0.5    |
| -propylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1,3,5-Tr       | 5    | \<0.5    | \<0.5    | 22.2     | 3.5      |
| imethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1,2,4-Tr       | 5    | \<0.5    | \<0.5    | 38.1     | 9.5      |
| imethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1-Meth         | 5    | \<0.5    | \<0.5    | 3.6      | 1.3      |
| ylethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Naphthalene    | 10   | \<0.5    | \<0.5    | 6.7      | 1.0 J    |
+----------------+------+----------+----------+----------+----------+
| Methyl         | 5    | 4.9 J    | NA       | 4.3 J    | 1.0 J    |
| tertiary butyl | 0(a) |          |          |          |          |
| ether (MTBE)   |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Total VOC      | \--  | 613      | 2,222    | 897      | 2,766    |
| Concentration  |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+

Note 1: April 2000 groundwater samples collected by BNL Environmental
Restoration Division -- OU III Carbon Tetrachloride Plume Removal
Action.

Note 2: Only primary contaminants shown. Other compounds may have been
detected, but at concentrations generally \< 5 μg/L.

(a): New York State Drinking Water Standard.

B: Compound also detected in blank sample.

J: Estimated analytical value.

D: Analytical value following dilution.

NA: Compound not analyzed for.

\*\*: Primary breakdown products of carbon tetrachloride.

**BNL Facility Environmental Monitoring Report**

**Service Station Facility**

**Groundwater Monitoring Program**

**Volatile Organic Compound Analytical Results for June 5, 2000**

**Table 5**

+----------------+------+----------+----------+----------+----------+
| **Compound**   | *    | **Well   | **Well   | **Well   | **Well   |
|                | *NYS | 0        | 0        | 0        | 0        |
|                | AW   | 85-235** | 85-017** | 85-236** | 85-237** |
|                | QS** |          |          |          |          |
|                |      | **       | **       | **       | **       |
|                | **   | (μg/L)** | (μg/L)** | (μg/L)** | (μg/L)** |
|                | (μg/ |          |          |          |          |
|                | L)** |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Carbon         | 5    | 503\. D  | 4,440.0  | 469.0 D  | 820.0 D  |
| tetrachloride  |      |          | D        |          |          |
+----------------+------+----------+----------+----------+----------+
| Methylene      | 5    | \<0.5    | \<0.5    | \<0.5    | \<0.5    |
| chloride\*\*   |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Chloroform\*\* | 7    | 7.2      | 48.8     | 8.1      | 5.9      |
+----------------+------+----------+----------+----------+----------+
| Toluene        | 5    | \<0.5    | \<0.5    | \<0.5    | \<0.5    |
+----------------+------+----------+----------+----------+----------+
| Tetra          | 5    | 1.2      | 9.1      | 12.3     | 4.5      |
| chloroethylene |      |          |          |          |          |
| (PCE)          |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Ethylbenzene   | 5    | \<0.5    | \<0.5    | 0.8      | \<0.5    |
+----------------+------+----------+----------+----------+----------+
| m,p-Xylenes    | 5    | \<0.5    | \<0.5    | 3.0      | \<0.5    |
+----------------+------+----------+----------+----------+----------+
| o-Xylene       | 5    | \<0.5    | \<0.5    | 11.0     | \<0.5    |
+----------------+------+----------+----------+----------+----------+
| Is             | 5    | \<0.5    | \<0.5    | \<0.5    | \<0.5    |
| opropylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| n              | 5    | \<0.5    | \<0.5    | \<0.5    | \<0.5    |
| -propylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1,3,5-Tr       | 5    | \<0.5    | \<0.5    | 5.5      | \<0.5    |
| imethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1,2,4-Tr       | 5    | \<0.5    | \<0.5    | \<0.5    | \<0.5    |
| imethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Naphthalene    | 10   | \<0.5    | \<0.5    | 1.4      | \<0.5    |
+----------------+------+----------+----------+----------+----------+
| Methyl         | 5    |          | NA       |          |          |
| tertiary butyl | 0(a) |          |          |          |          |
| ether (MTBE)   |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Total VOC      | \--  | 511      | 4,499    | 512      | 830      |
| Concentration  |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+

Note 1: June 2000 groundwater samples collected by BNL Environmental
Restoration Division -- OU III Carbon Tetrachloride Plume Removal
Action.

Note 2: Only primary contaminants shown. Other compounds may have been
detected, but at concentrations generally \< 5 μg/L.

(a): New York State Drinking Water Standard.

B: Compound also detected in blank sample.

J: Estimated analytical value.

D: Analytical value following dilution.

NA: Compound not analyzed for.

\*\*: Primary breakdown products of carbon tetrachloride.

**BNL Facility Environmental Monitoring Report**

**Service Station Facility**

**Groundwater Monitoring Program**

**Volatile Organic Compound Analytical Results for July 7, 2000**

**Table 6**

+----------------+------+----------+----------+----------+----------+
| **Compound**   | *    | **Well   | **Well   | **Well   | **Well   |
|                | *NYS | 0        | 0        | 0        | 0        |
|                | AW   | 85-235** | 85-017** | 85-236** | 85-237** |
|                | QS** |          |          |          |          |
|                |      | **       | **       | **       | **       |
|                | **   | (μg/L)** | (μg/L)** | (μg/L)** | (μg/L)** |
|                | (μg/ |          |          |          |          |
|                | L)** |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Carbon         | 5    | 228 D    | 3,300 D  | 940      | 713      |
| tetrachloride  |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Methylene      | 5    | \<0.5    | 1.1      | \<5.0    | \<5.0    |
| chloride\*\*   |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Chloroform\*\* | 7    | 3.1      | 45.8     | 9.1      | 5.0      |
+----------------+------+----------+----------+----------+----------+
| Toluene        | 5    | \<0.5    | 0.5      | \<5.0    | \<5.0    |
+----------------+------+----------+----------+----------+----------+
| Tetra          | 5    | 0.7      | 12.0     | 10.2     | 4.5 J    |
| chloroethylene |      |          |          |          |          |
| (PCE)          |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Ethylbenzene   | 5    | \<0.5    | 1.8      | \<5.0    | \<5.0    |
+----------------+------+----------+----------+----------+----------+
| m,p-Xylenes    | 5    | \<0.5    | 6.0      | 9.5      | \<5.0    |
+----------------+------+----------+----------+----------+----------+
| o-Xylene       | 5    | \<0.5    | 4.2      | 4.8      | \<5.0    |
+----------------+------+----------+----------+----------+----------+
| n              | 5    | \<0.5    | \<5.0    | \<5.0    | \<5.0    |
| -propylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1,3,5-Tr       | 5    | \<0.5    | \<5.0    | \<5.0    | \<5.0    |
| imethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1,2,4-Tr       | 5    | \<0.5    | 3.7 J    | 3.7 J    | \<5.0    |
| imethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Naphthalene    | 10   | \<0.5    | \<5.0    | \<5.0    | \<5.0    |
+----------------+------+----------+----------+----------+----------+
| Methyl         | 5    | NA       | NA       | NA       | NA       |
| tertiary butyl | 0(a) |          |          |          |          |
| ether (MTBE)   |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Total VOC      | \--  | 232      | 3,373    | 977      | 718      |
| Concentration  |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+

Note 1: July 2000 groundwater samples collected by BNL Environmental
Restoration Division -- OU III Carbon Tetrachloride Plume Removal
Action.

Note 2: Only primary contaminants shown. Other compounds may have been
detected, but at concentrations generally \< 5 μg/L.

(a): New York State Drinking Water Standard.

B: Compound also detected in blank sample.

J: Estimated analytical value.

D: Analytical value following dilution.

NA: Compound not analyzed for.

\*\*: Primary breakdown products of carbon tetrachloride.

**BNL Facility Environmental Monitoring Report**

**Service Station Facility**

**Groundwater Monitoring Program**

**Volatile Organic Compound Analytical Results for August 1, 2000**

**Table 7**

+----------------+------+----------+----------+----------+----------+
| **Compound**   | *    | **Well   | **Well   | **Well   | **Well   |
|                | *NYS | 0        | 0        | 0        | 0        |
|                | AW   | 85-235** | 85-017** | 85-236** | 85-237** |
|                | QS** |          |          |          |          |
|                |      | **       | **       | **       | **       |
|                | **   | (μg/L)** | (μg/L)** | (μg/L)** | (μg/L)** |
|                | (μg/ |          |          |          |          |
|                | L)** |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Carbon         | 5    | 443 D    | 2,830 D  | 494 D    | 809      |
| tetrachloride  |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Methylene      | 5    | 0.3 JB   | 1.7      | \<0.5    | 4.6      |
| chloride\*\*   |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Chloroform\*\* | 7    | 8.6      | 64.7     | 5.3      | 6.4      |
+----------------+------+----------+----------+----------+----------+
| Toluene        | 5    | 1.0      | 2.4      | 1.0      | 1.0 J    |
+----------------+------+----------+----------+----------+----------+
| Tetra          | 5    | 1.0      | 15.4     | 7.0      | 2.7 J    |
| chloroethylene |      |          |          |          |          |
| (PCE)          |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Ethylbenzene   | 5    | \<0.5    | \<0.5    | \<0.5    | \<1.0    |
+----------------+------+----------+----------+----------+----------+
| m,p-Xylenes    | 5    | \<0.5    | 51.3     | \<0.5    | \<2.0    |
+----------------+------+----------+----------+----------+----------+
| o-Xylene       | 5    | \<0.5    | 24.3     | 0.3 J    | \<1.0    |
+----------------+------+----------+----------+----------+----------+
| n              | 5    | \<0.5    | 0.5      | \<0.5    | \<5.0    |
| -propylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1,3,5-Tr       | 5    | \<0.5    | 6.2      | \<0.5    | \<5.0    |
| imethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1,2,4-Tr       | 5    | \<0.5    | 13.1     | \<0.5    | \<5.0    |
| imethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Naphthalene    | 10   | \<1.0    | 0.5      | \<1.0    | \<1.0    |
+----------------+------+----------+----------+----------+----------+
| Methyl         | 5    | 3.1      | \<5.0    | 3.3 J    | 5.2      |
| tertiary butyl | 0(a) |          |          |          |          |
| ether (MTBE)   |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Total VOC      | \--  | 457      | 3,010    | 511      | 824      |
| Concentration  |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+

Note 1: August 2000 groundwater samples collected by BNL Environmental
Restoration Division -- OU III Carbon Tetrachloride Plume Removal
Action.

Note 2: Only primary contaminants shown. Other compounds may have been
detected, but at concentrations generally \< 5 μg/L.

(a): New York State Drinking Water Standard.

B: Compound also detected in blank sample.

J: Estimated analytical value.

D: Analytical value following dilution.

NA: Compound not analyzed for.

\*\*: Primary breakdown products of carbon tetrachloride

**BNL Facility Environmental Monitoring Report**

**Service Station Facility**

**Groundwater Monitoring Program**

**Volatile Organic Compound Analytical Results for September 6, 2000**

**Table 8**

+----------------+------+----------+----------+----------+----------+
| **Compound**   | *    | **Well   | **Well   | **Well   | **Well   |
|                | *NYS | 0        | 0        | 0        | 0        |
|                | AW   | 85-235** | 85-017** | 85-236** | 85-237** |
|                | QS** |          |          |          |          |
|                |      | **       | **       | **       | **       |
|                | **   | (μg/L)** | (μg/L)** | (μg/L)** | (μg/L)** |
|                | (μg/ |          |          |          |          |
|                | L)** |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Carbon         | 5    | 378 D    | 3,280 D  | 479 D    | 539      |
| tetrachloride  |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Methylene      | 5    | \<0.5    | 0.7      | \<0.5    | \<5.0    |
| chloride\*\*   |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Chloroform\*\* | 7    | 8.7      | 58.9     | 6.5      | 5.5      |
+----------------+------+----------+----------+----------+----------+
| Toluene        | 5    | \<0.5    | 0.9      | \<0.5    | \<5.0    |
+----------------+------+----------+----------+----------+----------+
| Tetra          | 5    | 1.0      | 13.0     | 7.2      | 2.9 J    |
| chloroethylene |      |          |          |          |          |
| (PCE)          |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Ethylbenzene   | 5    | \<0.5    | \<0.5    | \<0.5    | \<5.0    |
+----------------+------+----------+----------+----------+----------+
| m,p-Xylenes    | 5    | \<0.5    | 18.5     | \<0.5    | \<5.0    |
+----------------+------+----------+----------+----------+----------+
| o-Xylene       | 5    | \<0.5    | 17.0     | \<0.5    | \<5.0    |
+----------------+------+----------+----------+----------+----------+
| n              | 5    | \<0.5    | \<0.5    | \<0.5    | \<5.0    |
| -propylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1,3,5-Tr       | 5    | \<0.5    | 3.3      | \<0.5    | \<5.0    |
| imethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1,2,4-Tr       | 5    | \<0.5    | 4.5      | \<0.5    | \<5.0    |
| imethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Naphthalene    | 10   | \<0.5    | 0.3 J    | \<0.5    | \<5.0    |
+----------------+------+----------+----------+----------+----------+
| Methyl         | 5    | NA       | NA       | NA       | NA       |
| tertiary butyl | 0(a) |          |          |          |          |
| ether (MTBE)   |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Total VOC      | \--  | 388      | 3,397    | 493      | 547      |
| Concentration  |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+

Note 1: September 2000 groundwater samples collected by BNL
Environmental Restoration Division -- OU III Carbon Tetrachloride Plume
Removal Action.

Note 2: Only primary contaminants shown. Other compounds may have been
detected, but at concentrations generally \< 5 μg/L.

(a): New York State Drinking Water Standard.

B: Compound also detected in blank sample.

J: Estimated analytical value.

D: Analytical value following dilution.

NA: Compound not analyzed for.

\*\*: Primary breakdown products of carbon tetrachloride.

**BNL Facility Environmental Monitoring Report**

**Service Station Facility**

**Groundwater Monitoring Program**

**Volatile Organic Compound Analytical Results for October 30, 2000**

**Table 9**

+----------------+------+----------+----------+----------+----------+
| **Compound**   | *    | **Well   | **Well   | **Well   | **Well   |
|                | *NYS | 0        | 0        | 0        | 0        |
|                | AW   | 85-235** | 85-017** | 85-236** | 85-237** |
|                | QS** |          |          |          |          |
|                |      | **       | **       | **       | **       |
|                | **   | (μg/L)** | (μg/L)** | (μg/L)** | (μg/L)** |
|                | (μg/ |          |          |          |          |
|                | L)** |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Carbon         | 5    | 244      | 2,930 D  | 418 D    | 395 D    |
| tetrachloride  |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Methylene      | 5    | \<0.5    | \<0.5    | \<0.5    | \<0.5    |
| chloride\*\*   |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Chloroform\*\* | 7    | 5.5      | 60.8     | 6.6      | 5.3      |
+----------------+------+----------+----------+----------+----------+
| Toluene        | 5    | \<0.5    | 3.5      | \<0.5    | \<0.5    |
+----------------+------+----------+----------+----------+----------+
| Tetra          | 5    | 0.8 J    | 25.9     | 7.0      | 3.4      |
| chloroethylene |      |          |          |          |          |
| (PCE)          |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Ethylbenzene   | 5    | \<0.5    | 0.6      | \<0.5    | \<0.5    |
+----------------+------+----------+----------+----------+----------+
| m,p-Xylenes    | 5    | \<0.5    | 48.1     | \<0.5    | \<0.5    |
+----------------+------+----------+----------+----------+----------+
| o-Xylene       | 5    | \<0.5    | 72.3     | \<0.5    | \<0.5    |
+----------------+------+----------+----------+----------+----------+
| n              | 5    | \<0.5    | 2.2      | \<0.5    | \<0.5    |
| -propylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1,3,5-Tr       | 5    | \<0.5    | 12.7     | \<0.5    | \<0.5    |
| imethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| 1,2,4-Tr       | 5    | \<0.5    | 21.6     | \<0.5    | \<0.5    |
| imethylbenzene |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Naphthalene    | 10   | 1.1      | 4.0      | \<0.5    | \<0.5    |
+----------------+------+----------+----------+----------+----------+
| Methyl         | 5    | 4.2 J    | 0.4 J    | 4.0 J    | 15.9     |
| tertiary butyl | 0(a) |          |          |          |          |
| ether (MTBE)   |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+
| Total VOC      | \--  | 256      | 3,182    | 436      | 420      |
| Concentration  |      |          |          |          |          |
+----------------+------+----------+----------+----------+----------+

Note 1: October 2000 groundwater samples collected by BNL Environmental
Restoration Division -- OU III Carbon Tetrachloride Plume Removal
Action.

Note 2: Only primary contaminants shown. Other compounds may have been
detected, but at concentrations generally \< 5 μg/L.

(a): New York State Drinking Water Standard.

B: Compound also detected in blank sample.

J: Estimated analytical value.

D: Analytical value following dilution.

NA: Compound not analyzed for.

\*\*: Primary breakdown products of carbon tetrachloride.

![](media/image3.png)