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} w Mr.Ron Rowe CAMBRIA October 15, 1997 to ensure that the water samples are taken from the depths required. For the other borings,one water sample will be taken from each well with a bailer as outlined in our protocols. Monitoring. Well Construction: The boring(s) will be converted into a 2-inch diameter ground water monitoring well(s)screened about,5 feet above and 15 feet below the first-encountered water table. The well head will be sealed and locked beneath a traffic-rated vault. SJCPHS recommendations for well construction will be observed, including screened intervals not greater than 20 feet in length. Well construction will be based on field observations of lithology and the extent and concentration of hydrocarbons. Cambria will be prepared to install a variety of slot sizes,screened intervals, and/or nested wells, if needed. Chemical Analysis:The soil and ground water samples will be analyzed for TPHg,benzene,toluene,ethyl benzene,and xylenes,(BTEX by EPA Methods 8015/8020 at a California certified laboratory. The samples will also be analyzed for oxygenated.fuel additives Methyl tert-Butyl Ether(MTBE),Tertiary Amyl Methyl Ether(TAME), di-Isopropyl Ether(DIPE),Ethyl tert-Butyl Ether(ETBE),tert-Butanol, and ethanol using EPA Method 8260. Methanol will be analyzed by EPA Method 8015 (modified). Proposed detection limits for the oxygenated fuel chemical compounds in water are as follows:MTBE-5 gg/L,TAME-5 gg/L,DIPE - 5 gg/L, ETBE.- 5 gg/L, tert-Butanol- 100 gg/L, ethanol-500 gg/L, and methanol - 1 mg/L. Proposed detection limits for the oxygenated fuel chemical compounds in soil are as follows: MTBE - 0.1 mg/kg, TAME-0.1 mg/kg,DIPE-0.1 mglkg,ETBE-0.1 mg/kg,tert-Butanol-5.0 mg/kg,ethanol 25 mg/kg, and methanol- 1.0 mg/kg. Physical Analysis:One soil sample from each lithological unit will be analyzed for.permeability,porosity, density, organic carbon content. Reporting: After the analytic results are received,we will prepare a subsurface investigation report that,at a minimum,will contain: • A summary of the site background and history, • Descriptions of the drilling and soil sampling methods, • Boring log and well construction diagrams, • Tabulated soil and ground water analytic results, • Analytic reports.and chain-of-custody forms, 3