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i <br /> / EE <br /> Ms. Katie Hower GEOMATRIX <br /> Chevron Environmental Management Company <br /> g p Y <br /> March 22, 2000 <br /> Page 2 <br /> Once the extent of petroleum hydrocarbon-affected soil has been determined, grab ground- <br /> water samples will be collected by installing a temporary well made of polyvinyl chloride <br /> (PVC)blank casing and well screen in two borings located downgradient of affected soil. If <br /> no petroleum hydrocarbon-affected soil is observed in the initial borings, groundwater sam- <br /> ples will be collected from these borings. If petroleum hydrocarbon-affected soil is observed, <br /> step-out borings will be advanced in the residential neighborhood(Figure 3). Step-out bor- <br /> ings would be performed at a later date. The grab groundwater samples will be collected <br /> using a disposable bailer and will be decanted into 40-m1 acidified volatile organic analysis <br /> (VOA) vials and 1-liter amber bottles. Sample containers will be labeled, sealed in plastic <br /> bags, and stored in an ice-cooled chest. Following collection of soil and groundwater sam- <br /> ples, boreholes will be backfilled with cement grout. <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 ana- <br /> lyzed for total petroleum hydrocarbons (TPH) as crude oil (C8-C36 carbon range)by EPA <br /> Method 8015 Modified; for polynuclear aromatic hydrocarbons (PAHs)by EPA Method 8270 <br /> SIM, and for benzene, toluene, ethylbenzene, and xylenes (BTEX)by EPA Method 8020. <br /> Groundwater samples will be will be analyzed for TPH quantified as gasoline (C6 to C12 <br /> carbon range) and diesel (C,o to C21 carbon range)using EPA Method 8015 Modified; BTEX <br /> using EPA Method 8021B; and PAHs using EPA Method 8270 SIM. The laboratory will <br /> perform TPHd analyses both with and without a silica gel cleanup on-.sample extracts prior to <br /> analysis. <br /> The field work will be scheduled within two weeks of obtaining the-appropriate permits. <br /> Please find enclosed a completed well permit application and a$89.00 check for the applica- <br /> tion fee. Geomatrix will contact San Joaquin County PHS-EHD to.schedule the field work. If <br /> you have any questions or require additional information,please call me. <br /> Sincerely yours, <br /> GEOMATRIX CONSULTANTS, INC. <br /> Michael R. Keim <br /> Project Scientist <br /> MRK/pp <br /> I:\DOC SAFE\6000S\6115.007\BURNS WORK PLAN.DOC <br /> Enclosures: Figures <br /> Well Permit Application <br /> Application Check <br /> Encroachment Permit <br /> i <br />