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t <br /> C <br /> i <br /> to the leak point. The three perimeter boxings/wells will <br /> have the 15 and 20, 25 and 30 foot samples composited for <br /> 1 testing. Soil sampling will be conducted in accordance with <br /> WaterWork's Soil Sampling Protocol (Appendix I) . Laboratory <br /> a analysis of soil samples will be conducted for benzene, <br /> toluene, ethyl benzene, xylenes (BTEX), and total petroleum <br /> hydrocarbons (TPH) by EPA method 8015/8020. Sequoia <br /> Analytical, a state certified laboratory, will perform the <br /> analyses. All excavated soils will be placed on plastic <br /> sheeting, covered with same and remain on site until <br /> laboratory results are received. Thereafter, a proposal for <br /> treatment or disposal of the excavated material will be <br /> prepared. <br /> 3. The wellheads will be surveyed to a common datum and <br /> Fgroundwater levels w e nDredto de erm site <br /> s eci£ic grQu dwater gradient. Free product thickness, if <br /> any, will be monitored using an interface probe. The <br /> monitoring will be conducted in accordance with WaterWork's <br /> Groundwater Monitoring Protocol (Appendix I) . <br /> 4. Subsequent to installation, water samples will be <br /> collected from the monitoring wells after purging a minimum <br /> Of four well volumes (casing and sandpack) . The purged <br /> € water remain on site, in secured 55 gallon drums (DOT 17—E) <br /> until laboratory results are received. A proposal for . the <br /> treatment or disposal of the water produced during well <br /> development and sampling will be then be prepared, <br /> �J Collection and preservation of all water sample3 will be in <br /> accordance with EPA protocol. Specific sampling procedures <br /> are outlined in WaterWork's Groundwater Sampling Protocol <br /> (Appendix I) . The water samples will be analyzed by Sequoia <br /> Analytical for 3TEX, and TPH by approved EPA method 503.1. <br /> 5. All site activities involving potential contact with <br /> hazardous materials (1.e. gasoline contaminated soils) will <br /> be conducted in accordance with WaterWork's Site Health and <br /> Safety Plan (Appendix II) . <br /> fi. A "=44,,,.lo-mi Assessment report will be prepared according <br /> to Regional BoaL-6 guidelines summarizing the findings of the <br /> Investigation and recommending remedial action alternatives, F <br /> as appropriate. The field investigation will be conducted <br /> W under the direct supervision of Pussell W. Juncal, CA <br /> r Registered Geologist No. 3864, who will review and sign the 4 <br /> y =h assessment report. <br />