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Mr Ronald Rowe March 4, 1998 Page 4 U S Environmental Protection Agency (EPA) Method 8020 and 8015 modified Samples from the stockpiled soil will be collected and analyzed for the same constituents HydroPunch® Groundwater Sampling One HydroPunch® groundwater sample will be collected from each boring Groundwater samples will be analyzed for the presence of TPH-GBTEX using U S EPA Method 8020 and 8015 modified and oxygenates using EPA Method 8260 Soil and groundwater samples will be submitted to a State of California Department of Toxic Substances Control certified laboratory for the analysis of hazardous materials Groundwater Monitoring Well Construction Well construction activities will be in accordance to State of California Well Standards (Bulletin 74-81 and 74-90, June 1991) and County mandated requirements If petroleum hydrocarbons are present in the HydroPunch® groundwater sample at MW-3, using a field test kit, then the primary location will be abandoned and well MW-3 will be constructed in the secondary location Based on the location of MW-3, MW-4 will be constructed If MW-3 is constructed at its primary location, then MW-4 will be installed at its primary location Otherwise, if MW-3 is constructed at its secondary location, then MW-4 will constructed at its secondary location Table 1 summarizes the well constructions, locations and purpose of each proposed well, as well as • the existing MW-1 The newly constructed wells and existing well will be professionally surveyed, both horizontally and vertically, to an accuracy of 0 01 feet vertically The survey will also locate several physical features of the site (i e buildings, storm drains, the "un-used" domestic well and the domestic well) (see Figure 1) Groundwater Well Development and Sampling All the newly constructed monitoring wells will be developed to remove the silts and fines from the well After these particulates are removed from the well, water may be pumped from the well using a submersible pump or bailed until clear, sediment-free water is produced All of the wells will be purged and sampled at a later date The analyses for the groundwater samples will be the same as for the HydroPunch® groundwater samples Project Schedule The field work will require approximately I week to complete This time frame includes drilling three boreholes (possibly four, if petroleum hydrocarbons are identified in HydroPunch& sample from the primary location of MW-3), well constructions, Use or disclosure of data continued on this sheet is subject to the restriction specified at the beginning of this document • MELIGENI62711WRK?LN DOC