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,+..oll <br /> /9r <br /> GEOMATRIX <br /> Mr. Michael J. Infurna <br /> San Joaquin County Public Health Services <br /> September 9, 1999 <br /> Page 2 <br /> sheets, plastic end caps, and tape, labeled, and stored in an ice-cooled chest. Following <br /> collection of soil and groundwater samples, boreholes will be backfilled with cement grout. <br /> Grab groundwater samples will be collected from two borings advanced within the affected <br /> soil near borings EB-2 and EB-7. The samples will be collected by advancing drive casing <br /> through the affected soil until clean soil is observed in the soil core. The grab groundwater <br /> samples will then be collected from just beneath the affected soil by installing a temporary well <br /> made of polyvinyl chloride(PVC)blank casing and well screen within the cased borehole to <br /> avoid cross-contamination of the sample by the affected soil. The grab groundwater samples <br /> will be collected using a disposable bailer and will be decanted into 40-m1 acidified volatile <br /> organic analysis (VOA)vials and 1-liter amber bottles. Sample containers will be labeled, <br /> sealed in plastic bags, and stored in an ice-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 Modified; for polynuclear aromatic hydrocarbons (PAHs) by EPA Method 8270 SIM, <br /> and for benzene, toluene, ethylbenzene, and xylenes (BTEX)by EPA Method 8020. The <br /> groundwater samples will be analyzed for BTEX using EPA Method 8021B; and PAHs using <br /> EPA Method 8270 SIM. <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 check is included for the boring permits (APN 232-170-05 and 232-170-07); <br /> the permit applications are being forwarded to you by Precision Sampling, Inc. Please call <br /> either Elizabeth Lu at Chevron at(925) 842-1343 or Lange Jorstad at(510) 663-4100 if you <br /> have any questions. <br /> Sincerely, <br /> GE MATRIX CONSULTANTS, INC. <br /> Michael R. Keim Dawn A. Z o, C.E.G. <br /> Project Scientist Principal ydrogeologist <br /> MRK/DAZ/pp <br /> I:\Doc Safe\5000s\5650\Ridgeway-Pombo wp.doc <br /> Attachments: Figures 1 and 2 <br /> Check for Boring Permits <br /> cc: Elizabeth Lu, Geomatrix <br />