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"� "w'Zlct-15-97 04:49P shioll 01 P-03 <br /> Y Mr.Ron Rowe CAMBRIA <br /> October 15, 1997 <br /> to ensure that the water samples are taken from the depths required. For the other borings,one water sample <br /> will be taken from each well witlh a bailer as outlined in our prutoeols. <br /> Monitoring Well Construction The borings) will be converted into a 2-inch diatrtcter ground water <br /> monitoring well(s)screened abut _5 feet above and 15 feet below the first-encountered water table. The well <br /> head will be sealed and locked beneath a traffic-rated vault. <br /> SDCPHS recommendations for well construction will be observed,including screened intervals not greater <br /> than 20 feet in length. Well construction will be based on field observations of lithology and the extent and <br /> conmtration of hydrocarbons.Cambria will be prepared to install a variety of shat sizes,screened intervals, <br /> and/or nested wells,if needed. <br /> Cheonk4l Analysis:The soil and ground water samples will be analyzed for TPH&benzene,toluene,ethyl <br /> benzene,and xylenes,(B'TEX)by TEPA Methods 8015/8020 U a Califoreia certified laboratory_ The samples <br /> will also be analyzed for oxygenated fuel additives Methyl Cert-Butyl Ether(MTBE),Tertiary Amyl Methyl. <br /> Ether(TAME),di-Isopropyl Eiber(DIPE),Ethyl tent-Butyl Ethcr OFIME),tert Butanol,and ethanol using <br /> EPA Method 8260. Methanol vv111 be analyzed by EPA Method 8015(modified). Proposed detection limits <br /> for the oxygenated fuel chemical compounds in water are as follows:MTBE-5 pAg4,,TAME-5 gg/L,DIP'E <br /> -5 gg/L, E'TBE -5 gg/L,tent-Butanol- 100 pig/L.,ethanol-500 Wg/L,and rta:tltavol- I mg/L. Proposed <br /> detection limits for the oxygenated fuel chemical ctompotmds in soil are as follows: MTBE -0.1 mg/kg, <br /> r <br /> TAME-0.1 mg/kg,RIPE-0.1 mg/kg,ETBE-0.1 mgt,tett-Butanol-5.0 mg/kg,,ethanol-25 mg/kg,and <br /> methanol-1.0 mg/kg. <br /> Physical Analysis. One soil sample from each lithological unit will be analyzed for permeability,porosity, <br /> density,organic carbon content_ <br /> I <br /> Reporting: After the analytic results are received,vire will prepare a subsurface investigation report that,at <br /> a minimum,will contain: <br /> A summary of the site background and history, <br /> Descriptions of the drilling and soil sampling methods, <br /> • Boring log and well construction diagrams, <br /> a Tabulated soil and ground water analytic results, <br /> Analytic reports and chain-of-custody forms, <br /> 3 <br /> I <br /> I <br />