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Mr Don Rodgers Proposal P96-050 31 • May 14, 1996 Page 4 hydrocarbons as diesel using USEPA Method 8015, chlorinated hydrocarbons (CLHC) using USEPA Method 8240, PCBs using USEPA Method 8080_ and cadmium, chromium, lead, nickel, and zinc using the Waste Extraction Test. In addition, soil samples collected at different stratigraphic units (EMCON is estimating 3 different units) will be analyzed for permeability, moisture, saturation, bulk density and total organic carbon Disposal of the drill cuttings are summarized in subtask 2B Subtask 2.13 - Installation of Monitoring Well EMCON will contract a licensed well driller to drill one exploratory bonne and install one groundwater monitoring well using 10-inch-diameter hollow stem auger dulling equipment (see Figure 2) The monitoring well will be installed upgradient from the former UST(s) The well will be used to evaluate groundwater conditions upgradient from the former UST(s) It is EMCON's opinion that ARCO Well MW-6 and wells located at the Chevron site should be used to evaluate the lateral definition of dissolved hydrocarbons beneath the site The boring will be drilled to approximately 55 feet bgs (15 feet below first encountered groundwater, static groundwater season low is approximately 40 feet bgs) However, if a 5-foot thick clay layer is encountered less than 15 feet below the groundwater surface, the drilling will be terminated within the clay Soil samples collected from the boring will be submitted to a state-certified laboratory and will be analyzed for TPHG. BTEX and MTBE using USEPA Method 8015 and 8020, respectively EMCON will observe the construction of one 4-inch diameter monitoring w ell in the boring The well will be constructed using 25 feet of 0 02 slotted screen All generated drill cuttings and excess soil samples will be stored on-site, and placed on and covered with visqueen Four soil samples will be collected from the soil cuttings and be composited a state-certified laboratory to determine the appropriate disposal method The composited soil sample will be analyzed for TPHG, BTEX, total lead, reactivity, corrosivity and ignitabilty The cost estimate for soil disposal is based on the soil being nonhazardous and disposing the soil at a Class III landfill EMCON will contract a licensed land surveyor to survey the top of casing of each well with respect to mean sea level Subtask 2.0 - Well Development Development of the new monitoring well(s) will consist of bailing, surging with a surge block, pumping, or a combination of these techniques Details of well development • techniques will be described in an appendix to the workplan SACK T96-650 31-9W= i