VIACOM
April 7, 2003

1.0 BACKGROUND

This report summarizes the results of surface water, flow and water level monitoring work completed by Viacom Inc. during the fourth quarter of 2002 at the Bennett's Dump site.

Routine surface water monitoring was performed at a total of four spring and stream locations in accordance with the April 2002 Long Term Groundwater Monitoring Plan (LTGWMP) and the March 2002 Groundwater Investigation Plan (GIP) for this site. Continuous monitoring of flow and water levels was also performed at six locations selected by Viacom to promote the understanding of relationships between flows under storm and non-storm conditions, and the resulting PCB concentrations in groundwater and surface water at this site.

2.0 GROUNDWATER AND SURFACE WATER MONITORING

The monitoring work described in this report was formed on October 11, November 13 and December 5, 2002. This three month time period constitutes the fourth reporting quarter for Bennett's Dump for 2002.

Scope of Routine Sampling and Monitoring

The scope of routine groundwater sampling for this monitoring period comprised a combination of monthly and quarterly sampling stipulated in the LTGWMP and GIP, as summarized in Table 1.

Surface water sampling was performed at the following locations:

• Stout's Creek Upstream
• Stout's Creek Downstream
• Mound Spring
• Middle Spring

• Mound Spring was not flowing and therefore not sampled on October 11 and December 5.
• Mid-North Spring and North Spring were not flowing on October 11, November 13 and December 5, and therefore were not sampled.

Sample Collection and Handling

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

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 0.2 ppb) by EPA SW-846 method 8082. Samples were also analyzed for total suspended solids (TSS) by EPA method 160.2.

Quality Assurance

For quality assurance purposes a duplicate sample and a field blank were collected during each sampling event. All environmental and blank samples were labeled and logged onto a chain-of- custody form. The samples were stored and transported on ice in insulated coolers. Viacom maintain ed custody of the water samples until shipment to the analytical laboratory.

Field FLAK sample numbers for the October-December sampling events are BD9312, BD9320 and BDY322. PCB results were BDL (Below Detection Limit) for all field blank samples.

Analytical Results for Surface Water Samples

Field parameter measurements, PCB analytical results, and QA/QC results for surface water samples collected during this reporting period are reported in Tables 2 through 7 (attached). Each table summarizes historical groundwater monitoring data collected since the completion of the remedy in November 2000. Copies of the chain-of-custody forms are provided in Appendix A. Copies of the certificates of analysis are provided in Appendix B. A validation summary for these samples appears in Appendix C. Copies of the field sampling data sheets are on file at PSARA's Bloomington Branch Office.

Monitoring wells MW-6I and MW-6D are sampled on a semiannual schedule and were not sampled during the fourth quarter. Historical results of sampling at those two wells are presented in Tables 8 and 9, respectively. The tables will be updated after the next semiannual sampling of MW-6I and MW-6D.

Quarterly MW-5 Observation

In accordance with section 2.1.1 of the LTGWMP, sediment and water were purged from monitor well MW-5 during the third quarter of 2002. Following the completion of the purging work, the well was allowed to recharge and equilibrate for slightly over two weeks. Then MW-S was monitored weekly for a period of about one month to verify the success of the purging operation Ad to determine whether or not free-phase PCB would migrate into the MW-5 borehole. The results of that monitoring were reported in the Bennett's Dump third quarter 2002 Groundwater monitoring report.

Section 2.1.2 of the LTGWMP stipulates quarterly observation of MW-5 for a period of one year following the initial cleanout, purge and monitoring described above. The first such quarterly observation was performed on December 5, 2002. Inspection was performed using a 2" diameter clear plastic bailer. First, the bailer was half filled at the MW-5 water column's surface, raised out of the well and inspected for indications of free product. No such indicators were visible. The bailer was emptied into a carboy and then lowered to the bottom of the well. It was raised out of the well and again examined. The water in the bailer was clear with a small amount of brown-black particulate matter and mud but no obvious free product either inside the bailer or on its exterior. A small amount of water was released from the bottom of the bailer and caught in a plastic cup. A few very small droplets of brown oil were observed clinging to the sides of the cup, similar to what had been seen in previous MW-5 inspections. Based on these observations, there has been no annarent recharge of free-phase PCB into MW-5. The second quarterly observation of MW-5 will be performed in March 2003.

3.0 CONTINUOUS FLOW AND WATER LEVEL MONITORING

Scope of Work

The scope of Groundwater level and flow monitoring during this reporting period involved the use of dedicated instrumentation to record water level and other parameters as summarized in Table 10.

Water lever transducers, water level data logging equipment, and crest gauges were operated during all or part of the period from October 2002 through December 2002 at the following locations:

The approximate locations of the stations listed in Table 8 are shown on Figure 1.

Flow and Water Level Plots

The following plots for the monitored stations for this reporting period are attached:

• water Level elevation at Stout's Creek and Piezometer H
• water elevation and temperature at Icebox Quarry, Wedge Quarry, and MW-01
• flow data for the weir at Middle Spring

Quality Assurance

As a quality assurance check in documenting rain events and changes in flow, rainfall records for this time period were obtained from the Purdue University State Climatologist's web site (shadow.agru.purdue.edu/sc.index.html) for the rain gauge station at the Monroe County Airport. This record was obtained for comparison to the downloaded transducer data at the various monitoring locations. Raw rainfall data from the web site appear in Appendix D. Rain events of approximately 0.25 in. or more are indicated on the flow and water level plots. In addition, the plots for Stout's Creek show monthly cumulative rainfall data obtained from the Monroe County Airport rain gauge station.

As a further data quality check, manual water level measurements were made and crest gauges at Middle Spring, Mound Spring and Mid-North Spring were monitored during and after significant storm events. The purpose of the manual checks and crest gauge monitoring was to verify instrument readings, in particular those for installations susceptible to the accumulation of silt and/or algae growth. Manual field check data collected this reporting quarter are shown on the data plots. Crest gauge measurements appear in Table 11.

A complete instrument maintenance log for all of the Bennett's Dump installations is attached. This log details the installation, re-indexing, and maintenance histories of each transducer and data logger present at Bennett's Dump during the 4th Quarter.

Discussion

Data for this period are complete except as follows:

• The new Hydrologger was installed at Middle Spring on October 10, 2002. No Middle Spring continuous monitoring data are available prior to that date.
• The Troll 4000 transducers in Icebox and Wedge Quarries malfunctioned at the beginning of December and were replaced with mini-Trolls. No water temperature data are available after those replacements.
• The mini-Troll at Stout's Creek began collecting unusual data on December 30, 2002.

No Stout's Creek stage data are available after that date.

The Troll 4000 transducers installed in Icebox and Wedge Quarries malfunctioned at the beginning of December due to declining water temperatures. The alkaline batteries used in these instruments do not perform well as their ambient temperature drops below 45°F. When the batteries provide insufficient electricity to collect hourly pressure and temperature samples, the transducer overrides its testing parameters and stops collecting data. These transducers were removed and replaced with mini-Troll transducers operating with rechargeable nickel-metal hydride (NiMH) batteries, which perform well in colder temperatures. Since these mini-Troll transducers only collect elevation data, no water temperature data are available after the switch was made.

The unusual data collected by the mini-Troll in Stout's Creek potentially was due to a wet instrument cable. The plastic box used to keep the cable dry developed a leak during the snowy and wet period at the end of December, preventing the communication end of the cable from remaining dry. This cable and plastic box combination was replaced in early January with new materials, and data collection appears to have returned to normal.

Additionally, a beaver dam was constructed downstream of the Stout's Creek station on November 24 and 25, and the resulting pool of water flooded the area around the transducer. This dam was removed on December 16, and has not been rebuilt to date. Plotted data collected at Stout's Creek during this period demonstrate the effects of this flooding.

The above-mentioned technical problems represent interruptions in the continuous monitoring operation at these locations. The problems are briefly noted on the flow and water level plots (attached).

Crest Gauges

The purpose of the crest gauge at Middle Spring is to provide an indication of maximum flow to help evaluate the data recorded by the Hydrologger at this location. The purpose of the crest gauges at Mid-North Spring and Mound Spring was to provide an indication of maximum flow only, since there were no other instruments installed at these locations during the 4' Quarter. As stated previously, monitoring data for these crest gages are presented in Table 11.

Potentiometric Data

On December 5, 2002, water levels were measured by hand at five monitor wells, one piezometer, two quarries and one spring at the site. The specific measurement locations are listed in the table insert on Figure 1, which also depicts the resulting potentiometric surface across the site on this date.

If you have questions regarding the sampling and flow/water level monitoring activities or findings for this reporting quarter, please call Mike McCann at (812) 335-0424.

Dorothy M. Alke
Project Director