# Presentation: 222520

## Pohatcong Valley Superfund Site:Vapor Intrusion Investigation at Franklin Township Elementary School

- United States Environmental Protection Agency
- October 12, 2006

## Brief History

- Contaminated groundwater identified in 1979.
- NJDEP provided public water hookups to effected area (now called OU1).
- Pohatcong Valley listed as Superfund site in 1989
- Record of Decision signed for OU1 in 2006
- Remedial Investigation started for OU2
- Includes investigation of vapor intrusion pathway

## Slide 3

## Pohatcong Valley

- OU1 yellow area
- X – Former American National Can (ACN)

- OU2 light blue area
- X – Franklin Township Elementary School

- Subslab sampling locations - March

**X**

**X**

- Subslab sampling locations - June

- _OU1/OU2 Map_
- _TCE/PCE Plume Map_
- _VI Sampling Locations_
- _Fault Line_
- _Vertical Profile_

## Vapor Intrusion Investigation (VI)

- March 2006 - Four areas that transect the ground water plume were chosen for VI study.
- Initially, 8 buildings were sampled (6 subslab and 2  indoor air).
- The area near school was identified as having vapor intrusion pathway.
- June 2006 subslab sampling, followed by August sampling, which included sampling the air within the school.

## Indoor Air and Subslab Soil Gas Investigation Activities

- Analyze samples
- and
- Evaluate data

## Trace Atmospheric Gas Analyzer (TAGA) Mobile Laboratory 

## Franklin Township Elementary School – Sampling Locations

- Indoor air sample – Summa canister

- Indoor air sample – TAGA bus

- Subslab sample – Summa canister

## Slide 9

## Franklin Township Elementary School – Summa Results

- Elevated concentrations of TCE detected in the subslab samples; indoor air concentrations of TCE detected but not elevated

| Location | TCE (μg/m3) | PCE (μg/m3) |
| --- | --- | --- |
| Boiler room Subslab 0032 | 122 | 6.7 |
| Basement File Room Subslab 0030 | 0.335 | 0.561 |
| Custodian Closet Subslab 0028 | 64.2 | 12.0 |
| Custodian Closet Indoor Air 0029 | 0.411 | 0.292 |
| Room 216 Indoor Air 0036 | 0.342 | 0.160 |
| Basement File Room Indoor Air 0031 | 0.491 | 0.567 |
| Boiler Room Indoor Air 0033 | 1.82 | 1.640 |
| Boiler Room Collocated Indoor Air 0039 | 3.00 | 0.355 |
| Kitchen | 0.284 | 0.263 |
| Room 112 Indoor Air 0034 | 2.78 | 0.298 |
| Room 112 Collocated Indoor Air 0035 | 2.79 | 0.1.85 |
| Room 104 Indoor Air 0038 | 1.070 | 0.249 |
| Room 106 Indoor Air 0040 | 1.300 | 0.292 |
| Ambient Air | 0.289 | 0.148 |

## Slide 11

## Franklin Township Elementary School – TAGA Results

| Location | TCE (μg/m3) | PCE (μg/m3) | Location | TCE (μg/m3) | PCE (μg/m3) |
| --- | --- | --- | --- | --- | --- |
| Room 101 | 1.075 | ND | Room 203 | 1.773 | 1.424 |
| Room 103 | 0.752 | ND | Room 204 | 0.699 | ND |
| Room 104 | 1.773 | ND | Room 205a | ND | ND |
| Room 105 | ND | ND | Room 206 | 1.236 | ND |
| Room 106 | 2.149 | ND | Room 207 | 0.645 | ND |
| Room 107 | 0.699 | ND | Room 208 | ND | ND |
| Room 109 | ND | ND | Room 209 | 0.860 | ND |
| Room 110 | ND | ND | Room 210 | 0.500 | ND |
| Room 111 | 0.914 | ND | Room 211 | 0.591 | ND |
| Room 112 | 4.192 | ND | Room 212 | 0.645 | ND |
| Room 113 | 1.451 | ND | Room 213 | 0.645 | ND |
| Bath Room 1 | 0.914 | ND | Room 214 | 0.645 | ND |
| Bath Room 2 | 1.021 | ND | Room 215 | 0.591 | ND |
| Kitchen | 1.182 | ND | Room 216 | 0.645 | ND |
| Principal’s Office | ND | ND | Room 230 | ND | ND |

- ND = ~0.11 μg/m3 for TCE and ~0.17 μg/m3 for PCE

## Franklin Township Elementary School – TAGA Results

| Location | TCE (μg/m3) | PCE (μg/m3) |
| --- | --- | --- |
| Bathroom 3 | ND | ND |
| Bathroom 4 | ND | ND |
| Bathroom 5 | 0.699 | ND |
| Bathroom 6 | ND | ND |
| Room 303 | ND | ND |
| Room 304 | ND | ND |
| Room 305 | ND | ND |
| Room 306 | ND | ND |
| Room 307 | ND | ND |
| Room 308 | ND | ND |
| Room 310 | 0.699 | ND |
| Custodian’s Closet | 0.591 | ND |

- ND = ~0.11 μg/m3 for TCE and ~0.17 μg/m3 for PCE

## Franklin Township Elementary School – Next Steps

- Meet with school officials and parents to discuss sampling results
- Design and install subslab depressurization system for the school
- Monitor indoor air and subslab depressurization system to ensure it is working properly

## Subslab Depressurization System

-  Pipes are installed in the subslab to draw air from underneath building
- Ventilation fan installed to pull air out
- Vapors are vented before they can enter the building

## Contact Information

- Project Manager:
- Stephen Cipot
- 212.637.4411
- _[cipot.stephen@epa.gov](mailto:cipot.stephen@epa.gov)_
- _[www.epa.gov/pohatcongvalley](http://www.epa.gov/pohatcongvalley)_

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