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U <br /> Ms. Lori Duncan,REHS Page 5 of 8 <br /> San Joaquin Environmental Health Department <br /> June 9, 2005 <br /> Classification System. Total depth for the borings is approximately8 feet bgs. Proposed SVE/AS well <br /> locations are shown in Figure 2. SVE and sparge well screen intery n on Figure 3. <br /> AS wells will be constructed using 1-inch OD, schedule-80, flush-threaded polyvinyl chloride (PVC) <br /> well casing. Two feet of 0.020-inch machine slotted, schedule-80 PVC well screen will be set from <br /> approximately 36 to 38 feet bgs. A Monterey No. 2/12 silica sand filter pack (sand), or equivalent, will <br /> be installed from 6-inches below the screen to 3-feet above the screen. A 2-foot bentonite seal will be <br /> installed above the sand, and grout will be used to fill the remaining annular space to 2 feet below the <br /> bottom of the SVE well screen. " tom, 1,-f r;Nnite-se 1 <br /> from-the-SVE—we:: ;..,mss. <br /> SVE wells will be constructed using 2-inch OD, schedule-80, flush-threaded PVC well casing. Ten feet <br /> of 0.020-inch machine slotted, schedule-80 PVC well screen will be set from 15 feet to 25 feet bgs. <br /> Sand will be installed from 1 foot below the screen (on top of the;Lfoot bentonite seal) to 3 feet above <br /> the screen. A 2 foot bentonite seal will be placed atop the SVE well sand, and grout will fill the <br /> remaining annular space to near surface. Groundwater is currently approximately 20 feet bgs. <br /> Remediation wells will be completed at the surface with a traffic-rated, flush-mounted well vault. <br /> Plumbing attachments will be placed on the top of each casing for connection to the future on-site <br /> remediation system. The wells will be completed under the direction of a URS geologist. Exact screen <br /> intervals will be determined in the field by the URS geologist. Well completion details will be presented <br /> on the boring logs. <br /> Task 3—SVE/AS System Installation,Troubleshooting,and Startup <br /> Upon receipt of approved permits from City of Stockton, system piping and compound construction will <br /> begin. The SVE and sparge equipment will not be installed until a permit has been issued from the <br /> SJVUAPCD. Upon completion of system installation, the system will be operated to verify the correct <br /> operation of all process equipment and controls and to troubleshoot and repair any component of the <br /> system that is not operating correctly. Once the system is fully operable, official startup will occur. <br /> Startup data will be evaluated to determine the remediation system performance. <br /> URS will submit the appropriate permits and fees following approval of this workplan. <br /> Task 4—Installation Technical Report <br /> Approximately 6 to 8 weeks following completion of these installation field activities, URS will prepare <br /> a report summarizing the system installation and initial analytical results. <br /> K:\Wprmess\J5 BP ARCO\02168\2005 System Installatim\SVE-AS Workplao.doe <br />