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1 li S lEC0R H iMr Mike Infurna February 26, 2004 Page 4 wells will be completed with neat cement from the bentonite seal to the ground surface Grout will be tremmied through one-inch diameter PVC pipe between the hammer casing and the well casing as the hammer casing is retrieved, preventing cross contamination and ensuring a proper seal between the upper and lower groundwater bearing zones The well casing will be topped with a locking cap The well head will be contained in a watertight monument well box ` Sample Selection and Analysis Sod samples will be collected at 10-foot intervals at depths ranging from 80 to 120 feet bgs (sod data currently exists to depths of 80 feet) Selected samples will be sent under chain-of-custody procedures to a California State-certified laboratory Samples will be analyzed for TPHg, benzene, toluene, ethylbenzene, xylenes (BTEX compounds), and fuel 'Y oxygenates methyl tert-butyl ether (MtBE), ethyl tert-butyl ether (EtBE), tert-Amyl methyl ether } (TAME), tert-butyl alcohol (TBA), di-isopropal ether (DIPE), ethylene dibromide (EDB), dl- chloroethane (1,2-DCA), and ethanol by EPA Method 8260, single run Monitoring Well Development and Sampling After installation, the wells will be developed by x� rigorously surging the wells over the length of the screen interval and by purging approximately 10 casing volumes of water After well development, groundwater samples will be collected from the newly installed well and sent under standard chain-of-custody procedures to a California State- certified laboratory The groundwater samples will be analyzed for the following TPHg, BTEX, fuel oxygenates (MtBE, DIPS, TAME, EtBE, TBA, EDB, 1,2-DCA and ethanol), and lead scavengers (1,2-DCE and EDB) using EPA Method 8260 0'� a Report A report will be prepared after completion of necessary fieldwork The report will include soil boring logs, sod and groundwater analytical results, geologic cross-section, chain-of-custody documentation, and conclusions and will be submitted as an updated Site Conceptual Model Field and laboratory procedures are presented as Attachment B k 1 SCHEDULE SECOR is prepared to initiate fieldwork within four to six weeks following approval of this work plan and issuance of permits by the San Joaquin County Environmental Health Department A report documenting the findings of this assessment is anticipated to be submitted approximately six to eight weeks after the completion of the fieldwork and receipt of laboratory results i rkk�yy A`J 4 rE 4 i ConocoPhdlipsl4409/work plans/WP For Vertical Assessment