Post-Excavation Groundwater Monitoring Results for October 19, 2001;
Bennett's Dump, Monroe County, Indiana

From: Viacom
Dated: January 4, 2002

This letter summarizes the results of the October 19, 2001 Groundwater sampling event performed by Viacom, Inc. at the Bennett's Dump site. In accordance with post-excavation interim monitoring requirements outlined in the Bennett's Dump Statement of Work (SOW), Groundwater and surface water sampling was performed at the following locations: Middle Spring, Stout's Creek Upstream, Stout's Creek Downstream, Stout's Creek West Branch, Mound Spring and an ephemeral spring, Mid-North-A Spring. Mid-North A Spring had been observed flowing only once before, June 6, 2001, during a storm sampling event. The grab sample collected in June had a PCB concentration of 0.24 ppb. The general locations of these sampling points are shown on Figure 1 (attached).

At spring and stream locations the samples were collected by carefully filling a new disposable beaker. The water was transferred from the beaker into a pre-cleaned amber glass 1-liter bottle supplied by the analytical laboratory. Routine sampling parameters including temperature and conductivity were measured and recorded.

For quality assurance purposes a duplicate sample and a field blank were collected. All samples were labeled and logged onto a chain-of-custody form. The samples were stored and transported in insulated coolers. Custody of the water samples was maintained by Viacom until shipment to the analytical laboratory. Samples were analyzed by Heritage Lab of Indianapolis, Indiana. The samples were analyzed to a detection limit of 0.1 parts per billion (ppb) for all PCB parameters (except Aroclor 1221, detection limit 0.5 ppb) by EPA Method 608/SW-846 Method 8082.

Field measurements, PCB analytical results, and QA/QC results for this Groundwater monitoring event are presented in Table 1 (attached). Historical PCB results for individual monitoring locations are presented in Tables 2 through 6.

Copies of the field log, chain-of-custody, laboratory analytical reports and validation statements for these samples are also attached.