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i Ms. Katie Hower GEOMATRIX Chevron Environmental Management Company March 22, 2000 Page`2 jOnce the extent of petroleum hydrocarbon-affected soil-has been determined, grab ground- water samples will be collected by installing a-temporary well made of polyvinyl chloride (PVC)blank casing and.well screen in two borings located downgradient of affected soil. If. no petroleum hydrocarbon-affected soil is observed in the initial borings on the WSID ease- ment, groundwater samples will be collected from these borings. If petroleum hydrocarbon- affected soil is observed, step-out borings will be advanced in the residential neighborhood (Figure 3). Step-out borings would be performed at a later date:-The grab groundwater sam- ples will be collected using a disposable bailer and will be decanted into 40-m1 acidified vola- .tile organic analysis (VOA) vials and 1-liter amber bottles. Sample containers will be labeled, sealed in plastic bags, and stored in an ice-cooled chest. Following collection of soil and groundwater samples, boreholes will be backfilled with cement grout. Geomatrix will submit the soil and groundwater-samples to a State of California certified analytical laboratory under Geomatrix chain-of-custody control. Soil samples will be ana- lyzed for total petroleum hydrocarbons (TPH) as crude oil(C8-C36 carbon range)by EPA Method 8015 Modified; for polynuclear aromatic hydrocarbons (PAHs)by EPA Method 8270 SIM, and for benzene, toluene, ethylbenzene, and xylenes (BTEX)by EPA Method 8020. Groundwater samples will be will be analyzed for TPH quantified as gasoline(C6 to C,2 carbon range) and diesel(C,0 to C24 carbon range)using EPA Method 8015 Modified; BTEX using EPA Method 8021B; and PAHs using EPA Method 8270 SIM. The laboratory will perform TPHd analyses both with and without a silica gel cleanup on sample extracts prior to analysis. The fieldwork will be scheduled within two weeks of obtaining the appropriate permits. Please find enclosed a completed well permit application form and a$89.00 check for the application fee. Geomatrix will contact San Joaquin County PHS-EHD to schedule the field work. If you have any questions or require additional information,please call me. Sincerely yours, GEOMATRIX CONSULTANTS, INC. i Michael R. Keim Project Scientist MRKIDAZ/pp I:\DOC-SAFE\6000S\6115.008\POMBO WORK PLAN.DOC Enclosures: Figures Well Permit Application Application Check Encroachment Permit f '.