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Chevron Products Company 5 <br /> Chevron Service Station#9 2033 508 West Charter Way Stockton CA March 5 2002 <br /> certified laboratory for analysis of TPHg using modified EPA Method 8015, and <br /> BTEX, and MtBE by EPA Method 8260 <br /> • Monitoring Well Development and Sampling. Following well installation, the <br /> monitoring wells will be developed by rigorously surging the wells over the <br /> length of the screen Interval and by purging approximately 10 casing volumes of <br /> water After well development, groundwater samples will be collected and <br /> submitted under standard chain-of-custody procedures to a California State- <br /> certified laboratory The groundwater samples will be analyzed for TPHg using <br /> modified EPA Method 8015, BTEX, and MtBE using EPA Method 8260 <br /> • Well Surveying and Groundwater Gradient Interpretation. A state-licensed <br /> surveyor will survey the newly Installed wells Depth to groundwater <br /> measurements will be collected during sampling activities and utilized for <br /> Interpretation of groundwater flow and gradient beneath the site <br /> • Slug Tests. Slug tests will be performed in each of the five newly Installed <br /> monitoring wells to derive values for transmissivity (T) and hydraulic <br /> conductivity (K) <br /> • Report. A report will be prepared after completion of necessary fieldwork The <br /> report will Include soil boring logs, soil and groundwater analytical results, <br /> chain-of-custody record, and conclusions <br /> Proposed field and laboratory procedures are presented as Attachment B <br /> SCHEDULE <br /> SECOR is prepared to Initiate fieldwork within 4 weeks following approval of this work <br /> plan and Issuance of permits by San Joaquin County A report documenting the <br /> findings of the well Installation can be prepared in approximately 8 to 10 weeks after the <br /> completion of the fieldwork and receipt of all analytical data <br /> If there are any questions regarding the contents of this work plan, please call Scott <br /> Gable at (916) 861-0400 extension 231 or Bob Cochran of Chevron at (925)-842-9655 <br /> Sincerely, <br /> SECOR International, Incorporated <br /> Bob W Jackson Jr o t Gable, 63 ?,ED GED <br /> Staff Geologist �k,?j j Principal Geology SCOTT <br /> iCf- <br /> j ppG{�3D+rLE o� <br /> '0n P40 LJFa P <br /> ,A Exp <br /> I 1Chevron1920331REPORTSI9-2033 SA CPT WPFA doe F � . <br /> OF C A�-�4 <br />