Event 79 (Fall 2019) and Groundwater Treatment System 2019 Annual Report for U.S. Army SSC.pdf

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Groundwater Pump and Treatment System Operation Semi-Annual Groundwater Monitoring (FY26)
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This is a groundwater monitoring event data submittal report for Fall 2019 (Event 79) conducted at the U.S. Army Natick Soldier Systems Center (NSSC) in Natick, Massachusetts. Plexus Scientific Corporation submitted the report on February 13, 2020, to the U.S. Army Environmental Command Northeast Environmental Services and Support Division, documenting groundwater sampling conducted November 15-20, 2019, across three remediation sites (NRDEC-05, NRDEC-11, and NRDEC-16). The monitoring covered five area zones: T-25 Area, Former Proposed Gymnasium Site, Boiler Plant Area, Buildings 22 and 36 Area, and Buildings 63, 2, and 45 Area.

The analytical results from two ALS sample delivery groups (SDGs 3070983 and 3071376) revealed volatile organic compound (VOC) detections across multiple monitoring wells and extraction wells. Notable findings included trichloroethene (TCE) detections ranging from 0.64 to 25.4 micrograms per liter, with the highest concentration (25.4 μg/L) detected in monitoring well MW-25BR and moderate levels in MW-208B (5.8 μg/L) and EW-07 (5.4 μg/L). Additional detections included acetone, tetrachloroethene, cis-1,2-dichloroethene, 2-butanone, and chloroform across various monitoring locations. The report includes detailed analytical data tables, groundwater sampling data sheets, calibration logs, and field notes as attachments. A project manager notation questioned the classification of certain results as "exceptions" based on historical comparison to June 2019 annual report data.

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Fall 2019 Groundwater Monitoring Event 79 Data Submittal

November 2019 Fall 2019 Groundwater Monitoring Event 79

Data Submittal U.S. Army Soldier Systems Center, Natick, MA

February 13, 2020

Ms. Denean Summers U.S. Army Environmental Command Northeast Environmental Services and Support Division 2450 Connell Road, Bldg. 2264 JBSA Ft Sam Houston, TX 79234-7664 Office: (210)466-1779 Email: b.d.summers.civ@mail.mil

RE: Fall 2019 Groundwater Monitoring Event 79 Data Submittal Environmental Remediation Services at NRDEC-05, NRDEC-11, and NRDEC-16 at U.S. Army Soldier Systems Center (SSC), Natick, Massachusetts.

Dear Ms. Summers, Plexus Scientific Corporation is pleased to submit this letter summarizing the implementation and results of the Fall 2019 Monitoring Event 79, which was conducted between November 15 and 20, 2019. Results from Monitoring Event 79 are included in the following ALS sample delivery groups (SDGs):

3070983 and 3071376

The analytical results for these SDGs are presented in Attachment A; groundwater sampling data sheets are presented in Attachment B; calibration logs are presented in Attachment C; and field notes are presented in Attachment D.

Should you need any further information, please do not hesitate to contact me.

Sincerely, PLEXUS SCIENTIFIC CORPORATION

Daniel Schur, EIT Project Manager

Cc: Mr. James Connolly

Groundwater Monitoring Event 79 Results Discussion Event 79 groundwater samples were collected from the T-25 Area, the Former Proposed Gymnasium Site, the Boiler Plant Area, Buildings 22 and 36 Area, and the Buildings 63, 2, and 45 Area. Results are discussed below.

Based on the analytical data presented in the attached tables (Attachment A), no unusual results in contaminant concentrations were observed during Event 79 with the following exceptions:

1. Trichloroethene was detected below reporting limits at 2.5 micrograms per liter (µg/L) in the sample for monitoring well MW-160A.

2. Trichloroethene was detected above reporting limits at 5.4 micrograms per liter (µg/L) in the sample for extraction well EW-07.

3. Trichloroethene was detected below reporting limits at 1.2 micrograms per liter (µg/L) in the sample for monitoring well MW-167B.

4. Trichloroethene was detected above reporting limits at 5.8 micrograms per liter (µg/L) in the sample for monitoring well MW-208B.

5. Trichloroethene was detected above reporting limits at 25.4 micrograms per liter (µg/L) in the sample for monitoring well MW-25BR

Analytes were detected in certain monitoring wells as follows:

1. 2-Butanone was detected at 3.6 J and 3.1 J µg/L in MW-129A and MW-5R, respectively.

2. Acetone was detected in the following concentrations (µg/L) in the following wells:

a. 4.5 J in EW-07

b. 4.2 J in EW-08

c. 8.8 in MW-127A

d. 3.2 J in MW-128A

e. 8.4 in MW-129A

f. 3.8 J in MW-18B

g. 3.1 J in MW-209B

h. 3.2 J in MW-51BR

i. 15.8 in MW-5R

j. 4 J MW-25BR

3. Chloroform was detected at 0.84 J µg/L in MW-201B

4. Cis-1,2-Dichloroethene was detected at 0.36 J, 0.40 J, and 1.5 µg/L in MW-18B, MW- 209B, and MW-25BR, respectively.

5. Tetrachloroethene was detected in the following concentrations (µg/L) in the following wells:

a. 0.42 J in MW-18B

b. 3.0 in EW-06

c. 1.1 in EW-07

d. 15.1 in EW-08

e. 0.54 J in MW-105A

f. 2.1 in MW-167B

g. 0.54 J in MW-208B

h. 0.53 J in MW-5R

James.B.Connolly Sticky Note I am unclear on why some of these are called out as exceptions. Comparing to detections shown in June 2019 Draft Final Annual Report Figure 5-3 Pg 95 of 180.

i.e., MW-160A TCE averaging about 2.0 vs. 2.5 ug/L MW-167B-2, similarly only slightly lower than historical MW-208B-HP2 slightly above average, but lower than Event 75, maybe returning to average range?

Maybe describe (briefly) why you see them as exceptions.

6. Trichloroethene was detected in the following concentrations (µg/L) in the following wells:

a. 2.5 in MW-160A

b. 9.1 in EW-03

c. 9.5 in EW-04

d. 5.4 in EW-07

e. 0.64 J in EW-08

f. 2.4 in MW-160A

g. 1.2 in MW-167B

h. 0.65 J in MW-202C

i. 5.8 in MW-208B

j. 2.8 in MW-209B

k. 0.65 J in MW-212C

l. 4.1 in MW-51BR

m. 24.2 in MW-125B

n. 25.4 in MW-25BR

o. 2.4 in MW-83B

Attachment A

Analytical Data

Attachment A ‐ Volatile Organic Compound (VOC) Results (Unvalidated)

Analyte Units MW‐160A MW‐18B MW‐02 MW‐03 MW‐04 MW‐05 MW‐06 MW‐07 MW‐08 MW‐105A MW‐127A MW‐128A MW‐129A MW‐160A MW‐167B MW‐18B MW‐201B MW‐202C MW‐208A MW‐208B 1,1,1,2‐Tetrachloroethane µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1,1,1‐Trichloroethane µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U

1,1,2,2‐Tetrachloroethane µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1,1,2‐Trichloroethane µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1,1‐Dichloroethane µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1,1‐Dichloroethene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1,1‐Dichloropropene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1,2,3‐Trichlorobenzene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1,2,3‐Trichloropropane µg/L 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 1,2,4‐Trichlorobenzene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1,2,4‐Trimethylbenzene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U

1,2‐Dibromo‐3‐chloropropane µg/L 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 1,2‐Dibromoethane µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1,2‐Dichlorobenzene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1,2‐Dichloroethane µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1,2‐Dichloropropane µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U

1,3,5‐Trimethylbenzene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1,3‐Dichlorobenzene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1,3‐Dichloropropane µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1,4‐Dichlorobenzene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 2,2‐Dichloropropane µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U

2‐Butanone µg/L 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 3.6 J 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 2‐Hexanone µg/L 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U

4‐Methyl‐2‐Pentanone(MIBK) µg/L 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U Acetone µg/L 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 4.5 J 4.2 J 5.0 U 8.8 3.2 J 8.4 5.0 U 5.0 U 3.8 J 5.0 U 5.0 U 5.0 U 5.0 U Benzene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U

Bromobenzene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U Bromochloromethane µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U Bromodichloromethane µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U

Bromoform µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U Bromomethane µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U Carbon Disulfide µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U

Carbon Tetrachloride µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U Chlorobenzene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U

Chlorodibromomethane µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U Chloroethane µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U Chloroform µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.84 J 1.0 U 1.0 U 1.0 U

Chloromethane µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U cis‐1,2‐Dichloroethene µg/L 1.0 U 0.36 J 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U cis‐1,3‐Dichloropropene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U

VOC 8260

James.B.Connolly

EW-02 through -7, not MW- , right?

Analyte Units MW‐160A MW‐18B MW‐02 MW‐03 MW‐04 MW‐05 MW‐06 MW‐07 MW‐08 MW‐105A MW‐127A MW‐128A MW‐129A MW‐160A MW‐167B MW‐18B MW‐201B MW‐202C MW‐208A MW‐208B

VOC 8260

Dibromomethane µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U Ethylbenzene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U

Hexachlorobutadiene µg/L 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U Isopropylbenzene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U

Methyl t‐Butyl Ether µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U Methylene Chloride µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U mp‐Xylene µg/L 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U Naphthalene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U n‐Butylbenzene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U n‐Propylbenzene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U o‐Chlorotoluene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U o‐Xylene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U p‐Chlorotoluene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U p‐Isopropyltoluene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U sec‐Butylbenzene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U

Styrene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U tert‐Butylbenzene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U Tetrachloroethene µg/L 1.0 U 0.42 J 1.0 U 1.0 U 1.0 U 1.0 U 3.0 1.1 15.1 0.54 J 1.0 U 1.0 U 1.0 U 1.0 U 2.1 1.0 U 1.0 U 1.0 U 1.0 U 0.54 J

Toluene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U trans‐1,2‐Dichloroethene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U trans‐1,3‐Dichloropropene µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U

Trichloroethene µg/L 2.5 1.0 U 1.0 U 9.1 9.5 1.0 U 1.0 U 5.4 0.64 J 1.0 U 1.0 U 1.0 U 1.0 U 2.4 1.2 1.0 U 1.0 U 0.65 J 1.0 U 5.8 Trichlorofluoromethane µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U

Vinyl Acetate µg/L 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U Vinyl Chloride µg/L 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U

Shading indicates a detected analyte µg/L = micrograms per liter J = Estimated U = Not Detected

James.B.Connolly

EW-2 through EW-08

Analyte Units 1,1,1,2‐Tetrachloroethane µg/L 1,1,1‐Trichloroethane µg/L

1,1,2,2‐Tetrachloroethane µg/L 1,1,2‐Trichloroethane µg/L 1,1‐Dichloroethane µg/L 1,1‐Dichloroethene µg/L 1,1‐Dichloropropene µg/L 1,2,3‐Trichlorobenzene µg/L 1,2,3‐Trichloropropane µg/L 1,2,4‐Trichlorobenzene µg/L 1,2,4‐Trimethylbenzene µg/L

1,2‐Dibromo‐3‐chloropropane µg/L 1,2‐Dibromoethane µg/L 1,2‐Dichlorobenzene µg/L 1,2‐Dichloroethane µg/L 1,2‐Dichloropropane µg/L

1,3,5‐Trimethylbenzene µg/L 1,3‐Dichlorobenzene µg/L 1,3‐Dichloropropane µg/L 1,4‐Dichlorobenzene µg/L 2,2‐Dichloropropane µg/L

2‐Butanone µg/L 2‐Hexanone µg/L

4‐Methyl‐2‐Pentanone(MIBK) µg/L Acetone µg/L Benzene µg/L

Bromobenzene µg/L Bromochloromethane µg/L Bromodichloromethane µg/L

Bromoform µg/L Bromomethane µg/L Carbon Disulfide µg/L

Carbon Tetrachloride µg/L Chlorobenzene µg/L

Chlorodibromomethane µg/L Chloroethane µg/L Chloroform µg/L

Chloromethane µg/L cis‐1,2‐Dichloroethene µg/L cis‐1,3‐Dichloropropene µg/L

VOC 8260

MW‐209B MW‐211B MW‐212C MW‐51BR MW‐5R MW‐6 TB 111919‐03 MW‐125B MW‐25BR MW‐83B TB 112019‐04

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 2.5 U 2.5 U 2.5 U 2.5 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 2.5 U 2.5 U 2.5 U 2.5 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

5.0 U 5.0 U 5.0 U 5.0 U 3.1 J 5.0 U 5.0 U 3.8 U 3.8 U 3.8 U 3.8 U

5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 3.8 U 3.8 U 3.8 U 3.8 U

5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 3.8 U 3.8 U 3.8 U 3.8 U

3.1 J 5.0 U 5.0 U 3.2 J 15.8 5.0 U 5.0 U 3.8 U 4 J 3.8 U 3.8 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

0.40 J 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 1.5 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

Analyte Units

VOC 8260

Dibromomethane µg/L Ethylbenzene µg/L

Hexachlorobutadiene µg/L Isopropylbenzene µg/L

Methyl t‐Butyl Ether µg/L Methylene Chloride µg/L mp‐Xylene µg/L Naphthalene µg/L n‐Butylbenzene µg/L n‐Propylbenzene µg/L o‐Chlorotoluene µg/L o‐Xylene µg/L p‐Chlorotoluene µg/L p‐Isopropyltoluene µg/L sec‐Butylbenzene µg/L

Styrene µg/L tert‐Butylbenzene µg/L Tetrachloroethene µg/L

Toluene µg/L trans‐1,2‐Dichloroethene µg/L trans‐1,3‐Dichloropropene µg/L

Trichloroethene µg/L Trichlorofluoromethane µg/L

Vinyl Acetate µg/L Vinyl Chloride µg/L

Shading indicates a detected analyte µg/L = micrograms per liter J = Estimated U = Not Detected

MW‐209B MW‐211B MW‐212C MW‐51BR MW‐5R MW‐6 TB 111919‐03 MW‐125B MW‐25BR MW‐83B TB 112019‐04

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 3.8 U 3.8 U 3.8 U 3.8 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U 1.5 U 1.5 U 1.5 U 1.5 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 0.53 J 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

2.8 1.0 U 0.65 J 4.1 1.0 U 1.0 U 1.0 U 24.2 25.4 2.4 0.75 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U 2.5 U 2.5 U 2.5 U 2.5 U

1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 1.0 U 0.75 U 0.75 U 0.75 U 0.75 U

Attachment A ‐ 1,4‐Dioxane Results (Unvalidated)

Analyte Units MW‐160A MW‐160A EW‐03 1,4‐Dioxane µg/L 0.61 0.61 0.16 µg/L = micrograms per liter J = Estimated U = Not Detected

SVOC 8270

Shading indicates a detected analyte

Attachment B

Groundwater Sampling Data Sheets

Attachment C

Calibration Logs

Attachment D

Field Notes

Attachment A: Analytical Data
Attachment B: Groundwater Sampling Data Sheets
Attachment C: Calibration Logs
Attachment D: Field Notes
A - Natick Event 79 combined.pdf
A - Natick Event 79
A - Natick Event 79 Diox

File details come from the government source that posted it. Updated .