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Chevron Products <br />CA <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 />/0. <br />Bob W. Jackson Jr. <br />Staff Geologist LKV7 j <br />IAChevron\92033\REPORTS\9-2033 SA CPT WPFA.doc <br />