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S E C 0 R i �i Mr Mike Infurna August 12, 2004 Page 2 bgs Approximately ten feet of screen will be placed in the bottom of the boring A grade of sand appropriate to the screen size will be placed in the annular space across the entire screened interval, and will extend approximately two foot above the top of the screen for the wells A bentonite pellet seal will extend two to four feet above the sand pack The monitoring 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 The well casing will be topped with a locking cap The well head will be contained in a watertight monument well box Proposed well construction details are included in Table 1 Sample Selection and Analysis No soil samples will be collected from wells MW-15 and MW-16 because of existing soil data Soil samples will be collected at 10 foot interval from 80 to 120 feet bgs in the well MW-17 Soil samples will be analyzed for TPHg, BTEX, fuel oxygenates (MtBE, D1PE, TAME, ELBE, TBA, and ethanol), and lead scavengers (1,2-DCA and EDB) using EPA Method 8260 Monitoring Well Development and Sampling After installation, the wells will be developed by 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 TPHg, BTEX, fuel oxygenates . (MtBE, DIPE, TAME, EtBE, TBA, and ethanol), and lead scavengers (1,2-DCA and EDB) using EPA Method 8260 Report A report will be prepared after completion of necessary fieldwork The report will include soil boring logs, soil and groundwater analytical results, chain-of-custody documentation, and conclusions Field and laboratory procedures are presented as Attachment B SCHEDULE SECOR is prepared to initiate fieldwork within four weeks following approval of this work plan and issuance of permits by the San Joaquin County Environmental Health Department A complete report will be prepared fully documenting the findings of the additional well installation activities 1 1 I ConocoPhdlipsl44091work plansMP For Well Installation 8-04 doc