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April 1, 1994 <br /> June 1, 1994 <br /> September 1, 1994 <br /> December 1, 1994 <br /> March 1, 1995 <br /> September 1, 1995 <br /> We propose to focus our initial monitoring in an area where soil conditions <br /> are least favorable for rapid bacterial migration. We recommend the area <br /> near VW-1, which is located near the former UST site, and where a thick bed <br /> of silty clay between 25 and 40 feet is highly contaminated. Monitoring of the <br /> rate of remediation in this area should provide a 'lower limit" estimate for <br /> site remediation. Subsequent drilling will provide confirmatory data in areas <br /> not previously monitored. <br /> A minimum of two soil borings will be drilled during each "progress" <br /> monitoring. Selected soil samples will be analyzed for gasoline constituents, <br /> bacteria numbers and types and, for the initial soil boring(s) (April 1994), an <br /> agricultural analysis. After September 1, 1995, the monitoring program can <br /> be re-evaluated. <br /> B. Vapor monitoring: Twice each month for the first six (6) months, monthly <br /> thereafter. Each monitoring and vapor (or remediation well) should be <br /> monitored for hydrocarbon vapors (using a PID) and CO2 and OZ (using the <br /> GasTech 3252 or similar unit). We do not believe there is a need to monitor <br /> for methane or nitrogen. <br /> GeoAudit does not recommend the installation of additional vapor <br /> monitoring points or grid before start-up of the remediation. We believe the <br /> present array of 15 monitoring and remediation wells will be adequate for <br /> initial evaluation of the monitoring point density. After two months of <br /> monitoring, GeoAudit will re-evaluate the density and install additional <br /> monitoring wells if needed. A work plan for soil borings and, if necessary, <br /> vapor wells, is attached. <br /> C. Groundwater Monitoring: Monthly for the first six (6) months; quarterly <br /> thereafter. The wells to be monitored should follow the categories in the C <br /> & A order. <br /> The monthly groundwater samples should be analyzed for bacteria <br /> populations, pH, temperature, EC, dissolved oxygen, TPH and BTE&X. <br /> We anticipate inoculating the soil and groundwater plumes as soon as a Waiver of Waste <br /> Discharge Requirements is adopted by the Board in January of 1994. We have tentatively <br /> O 1,"I A.&hnifu.Inc 4 <br />