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slotted, Schedule 40 PVC screen and 5 feet of blank PVC casing were placed within the augers A sand filter pack was placed within the annulus to about 1 5 feet above the top of the slotted screen as the augers were withdrawn The remainder of the annular space was filled with about 1 5 feet of hydrated bentonite pellets and then topped with a neat cement grout to the ground surface Well VW-I was completed flush with the ground surface and was covered by a bolted steel cover Monitoring well MW-4 was drilled on March 14, 2002 by Spectrum Exploration of Stockton using 8 25-inch hollow stem augers Well MW-4 was placed downgradient from the former UST on the eastern side of South Center Street Five-foot long soil cores were continuously collected from MW-4 from about 15 feet to the final depth of 41 25 feet Portions of each soil core were screened for organic vapors using a PID One soil sample, collected in a brass tube at 41 feet, was prepared for subsequent BTEX, TPHg and oxygenates analysis by capping the tube, labeling it and placing it an iced chest for chain- of-custody delivery to Acculabs Well MW-4 was completed by installing 20 feet of 2-inch diameter, 0 02- slotted, Schedule 40 PVC screen and 20 feet of blank PVC casing within the augers A sand filter pack was placed within the annular space to about 3 feet above the slotted screen as the augers were removed The remaining annular space was filled with about 3 feet of hydrated bentomte pellets and then topped by neat cement grout to the ground surface Well MW-4 was ' completed flush with the ground surface and was covered by a bolted steel cover Following completion, MW-4 was properly developed by pumping groundwater until a relatively clean stream was observed A well construction diagram for MW-4 is contained in Appendix A Soil cuttings and development water derived from the wells were placed in 55-gallon drums and temporarily stored onsite for disposal Drums were picked up and disposed of by PSC Transportation Services located in Benecia, California 2.3 Groundwater Monitoring Well Surveying and Sampling Positions and elevations of wells MW-1 through MW-4, SP-1 and VW-1 were surveyed on March 28, 2002 by Thompson-Hysell Engineers of Modesto, California Surveying was performed relative to mean sea level (msl) datum using an established City of Stockton benchmark Groundwater samples were collected from each of the four monitoring wells on March 28, 2002 by PSC's subcontractor, Kleinfelder Associates of 9 March 2002 Subsurface Slte investigation 1717 South Center Street-Stockton,California Prepared by Philip Services Corp H\ENV\62400132kl21382EGlProje is\StockCent\rnarch20o2mvesttgatton doc May 14,2002