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Work Plan for Additional Soil and Groundwater Assessment 3 <br /> Chevron U.S.A. Products Company, 139 South Center St.,Stockton,CA October 19, 1994 <br /> Task 3: Groundwater Monitoring Well Installation/Development <br /> The off-site groundwater monitoring well will be constructed of 2-inch-diameter polyvinylchloride <br /> (PVC) casing and 0.020-inch-slot PVC well screen. The well screen will be installed from <br /> approximately 35 feet BGS to 60 feet BGS. A sand filter pack will be placed within the annulus of <br /> the well from the bottom of the borehole to approximately 2 feet above the top of the well screen. <br /> The annulus will be sealed with approximately 2 feet of bentonite on top of the sand, and a portland <br /> cement/bentonite grout to the surface. The well heads will be protected by a locking cap and a <br /> traffic-rated, watertight street box set in concrete. <br /> Prior to the next scheduled groundwater monitoring and sampling event, the new groundwater <br /> monitoring well will be developed by surging and bailing to remove fines from the well and sand <br /> pack. Periodic measurements of pH, conductivity and temperature will be collected during <br /> development. The well will be developed until well water is visibly clear. <br /> Top of casing (TOC) and horizontal position of the well will be professionally surveyed relative to an <br /> established local bench mark or an arbitrary on-site datum. <br /> Task 4: Report Preparation <br /> Groundwater Technology will prepare a report summarizing the data collected under the scope of <br /> work detailed above. The report will document the methods and results of the work, summarize <br /> laboratory analytical results, and include appropriate maps. <br /> 066BASGB.WKP(CHV-54) - <br /> ❑❑J GROUNDNAATER <br /> ❑�❑ TECHNOLOGY <br />