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Mr. Stan Oleksy Applied Geotechnology Inc. USG Corporation April 17 , 1990 Page 2 o Review state and federal data bases for purpose of identifying hazardous waste generators and/or sites adjacent to or near the subject site. o Review the underground storage tank site report for California to assess proximity of registered storage tanks to the subject site. o Obtain and review historical aerial photographs of the site area from approximately 1960 through 1987, if available. Task 2: Hydrogeologic Investigation We believe two (2) additional wells are necessary to supplement data provid- ed by the three (3) existing well points and adequately characterize site hydrogeologic conditions. The new wells will be located to assess condi- tions upgradient and downgradient of the facility. The groundwater flow direction will be determined using the existing well points prior to locat- ing the additional wells. We will drill , install, and develop two (2) groundwater monitor wells. Bor- ings for the additional wells will be advanced using a truck-mounted drill rig equipped with 4-inch inside diameter hollow stem auger. Borings will be sampled continuously. Soil samples will be screened with an organic vapor meter (OVM) to qualitatively assess levels of soil contamination. Monitor wells will be constructed using 2-inch diameter, Schedule 40, flush- joint threaded PVC pipe. Each well will be placed about 2 feet above and 3 feet below the water table at the time of drilling. The AGI hydrogeologist or engineer will design each well based on actual subsurface conditions. Groundwater samples will be collected from each monitor well and each exist- ing well point on-site after purging. Samples will be labeled, chilled, and transported under Chain-of-Custody procedures to a California certified laboratory. Sampling equipment will be cleaned between samplings to avoid cross contamination. Groundwater samples will be analyzed for the following constituents: Analysis EPA Method Fuel Hydrocarbons Modified 8015 Volatile Aromatic Organic Compounds 8020 Halogenated Volatile Organic Compounds 8010 Metals (As, Cd, Cr, Cu, Pb, Zn) 6010 and 7000 Series Total Phenols 9066 Specific conductance, pH, and temperature will be measured in the field. Sediment samples will be collected from the two on-site drainage channels. Samples will be collected from the upstream and downstream reaches of these channels using stainless steel sampling utensils. Samples will be collected from the uppermost 6 inches of sediment. Sediment samples will be analyzed for fuel hydrocarbons, halogenated volatile organic compounds, and metals.