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Ms. Penny Fottrell GEOMATRIx <br /> Chevron Environmental Management Company <br /> September 12,2002 <br /> Page 5 <br /> PAHs using EPA Method 8270 SIMS. TPHd analyses will be performed both with and without a <br /> silica gel preparation procedure. <br /> Several samples will be submitted to the laboratory for quality assurance/quality control(QA/QC) <br /> purposes. One trip blank,provided by the laboratory,will accompany grab groundwater sample <br /> containers throughout the trip from the laboratory to the field and back to the laboratory. The trip <br /> blank will be analyzed for TPHg, and BTEX. One equipment blank will be collected using a dis- <br /> posable bailer. The equipment blank will be submitted to the laboratory, however,it will only be <br /> analyzed if there is a question regarding the results of the grab groundwater samples. In addition, <br /> one of the soil samples collected will be specified for matrix spike/matrix spike duplicate analysis <br /> G for TPHc,BTEX, and PAHs. <br /> a <br /> DATA EVALUATION,REPORTING,AND SCHEDULE <br /> After analytical results have been received, Geomatrix will perform a screening-level human <br /> health risk assessment based on these and previous results if we anticipate that no additional data <br /> are required. Geomatrix will prepare a report documenting field activities, analytical results,and <br /> results of the human health risk assessment. <br /> It is anticipated that field activities can commence approximately two weeks after receipt of your <br /> authorization to proceed and of ChevronTexaco's acquisition of property access, depending on <br /> d subcontractor availability. Analytical results will be received approximately two weeks after <br /> samples are submitted and a draft report can be submitted approximately four weeks after the <br /> �? receipt of analytical results. <br /> If you have any questions,please contact either of the undersigned. <br /> fSincerely yours, <br /> GEOMATRIX CONSULTANTS,INC. <br /> Je�r L.Patterson, P.E. Gary R Foote, R.G. <br /> Senior Engineer Principal Geologist <br /> t JLP/GRF/pp <br /> I:\Dw Sate\7000s\7243.00Mi1e 3\SRe 3 WPADC <br /> Attachments: Table 1 —Previous Soil Sample Analytical Results <br /> Table 2—Previous Groundwater Analytical Results <br /> Figure 1 —Development Area Location'Map <br /> Figure 2—Development Area Plan <br /> Figure 3 —Previous Soil Boring Locations and Results for Site 3 <br /> Figure 4—Previous Grab Groundwater Sampling Locations and Results for Site 3 <br /> Figure 5—Proposed Sampling Locations for Site 3 <br /> Borings Logs <br />