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i 0' <br /> Chevron Products Company 4 <br /> hevron Station#9-2033,508 West Charter Way,Stockton California March 19.2 1 <br /> intermediate water-bearing zones Screen intervals will be determined from <br /> stratagraphic information collected from the CPT logs and constructed to obtain an <br /> accurate representation of the groundwater conditions in the upper water-bearing zone <br /> at the site <br /> Adjacent to each of these wells, four additional groundwater monitoring wells will be <br /> advanced into the second water-bearing zone Screen intervals will be determined from <br /> CPT log data These wells will be installed to evaluate ground water and hydrocarbon <br /> rrugration/infiltration into the second water-bearing zone <br /> The sand pack for all wells will extend approximately one foot past the screen interval, <br /> followed by a three-foot thick bentonite seal From the bentonite seal the wells will be <br /> finished to grade with neat cement Surface completions will be at grade <br /> Following installation, all monitoring wells will be developed by rigorously surging the <br /> wells over the length of the screen interval and by purging approximately 10 casing <br /> volumes of water After well development, groundwater samples will be collected and <br /> transferred under standard chain-of-custody procedures to a California State-certified <br /> laboratory The groundwater samples will be analyzed for TPHg, BTEX, and the fuel <br /> oxygenates MtBE, DIPE, TAME,ELBE, TBA, EDB, 1,2-DCA, ethanol, and methanol <br /> by EPA Method 8260B <br /> Depth to groundwater measurements will be collected during sampling activities and <br /> utilized for interpretation of groundwater flow and gradient beneath the site <br /> A California licensed surveyor will survey all wells California state plane coordinates <br /> and latitude and longitude will be collected for monitoring and reporting purposes The <br /> proposed vertical survey accuracy is 0 01 ft <br /> Hydrologic Evaluation: <br /> The interaction between the groundwater in the upper and intermediate water-bearing <br /> zones will be evaluated Groundwater monitoring results will be used to assess <br /> horizontal and vertical gradients within the shallow and intermediate wells The data <br /> will be used to assess the unit hydraulic gradients for subsequent analysis <br /> The groundwater quality data from both shallow and intermediate groundwater <br /> monitoring wells will be compared to assess the vertical distribution of petroleum <br /> hydrocarbons and fuel oxygenates <br /> REPORT <br /> A site assessment report will be issued following the completion of all field activities, <br /> receipt of the analytical reports from the laboratory, survey records and physical and <br /> chemical data analysis <br /> 1 1Chevron1920331REP0RTSlfurther site assessment WP_RevA doc <br />