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Mr. Michael Infuma GEOMATRIX <br /> San Joaquin County Public Health Services <br /> February 16, 1999 <br /> Page 2 <br /> are not identified visually or through screening using an organic vapor meter. Soil samples <br /> will be collected in brass or stainless steel liners; sealed with Teflon sheets,plastic end caps, <br /> and tape; labeled; and stored in an ice-cooled chest. Following collection of soil and <br /> groundwater samples, boreholes will be backfilled with cement grout. <br /> Grab groundwater samples will be collected from up to five borings within and downgradient <br /> of affected soil near boring B-1. Grab groundwater samples will be collected following <br /> installation of temporary wells made of polyvinyl chloride(PVC)blank casing and well screen <br /> placed within the boreholes. Groundwater samples will be collected using disposable bailers <br /> and will be decanted into 40 ml acidified volatile organic analysis (VOA)vials and 1-liter <br /> amber bottles. Sample containers will be labeled, sealed in plastic bags, and stored in an ice- <br /> cooled chest. <br /> Geomatrix will submit the soil and groundwater samples to a State of California certified <br /> analytical laboratory under Geomatrix chain-of-custody control. Soil samples will be analyzed <br /> for total petroleum hydrocarbons (TPH) as crude oil (C8-C36 carbon range)by EPA Method <br /> 8015; for polynuclear aromatic hydrocarbons (PAHs)by EPA Method 8270 SIM, and for <br /> benzene, toluene, ethylbenzene, and xylenes (BTEX)by EPA Method 8020. Groundwater <br /> samples will be will be analyzed for TPH quantified as gasoline (C6 to C12 carbon range) <br /> using EPA Method 8015; TPH quantified as diesel (C 10 to C24 carbon range)using EPA <br /> Method 8015 Modified; BTEX using EPA Method 8021B; and PAHs using EPA Method 8270 <br /> SIM. Prior to TPHc and TPHd analyses,the laboratory will perform a silica gel clean-up on <br /> sample extracts. <br /> The field work will be scheduled within two weeks of approval of this workplan. You will be <br /> notified at least 48 hours prior to implementation of field work or if there are any changes in <br /> the schedule. A soil boring permit application and check are included with this work plan. <br /> Please call either Elizabeth Lu with CPL at(925) 842-6855 or Michael Keim at(415) 743- <br /> 7107 if you have any questions. <br /> Sincerely, <br /> GEOMATRIX CONSULTANTS, INC. <br /> Michael R. Keim Dawn A. Z4ogeologist <br /> E.G. <br /> Project Scientist Principal H <br /> MRK/DAZ/pp <br /> I:\Doc_Safe\5000s\5223\Manswkpin.doc <br /> Attachment <br /> cc: Katie Hower- CPL <br /> Elizabeth T. Lu- CPL <br />