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of removed wells Started backfilling with pea gravel to 10 feet below surface March 4, 2003 Finished backfill with pea gravel to 3 112 feet below surface March 11, 2003 Started compaction backfill with clean road base, placed piping laterals and traffic boxes in excavation for future monitor well placement March 13, 2003 Cleaned and emptied Baker Tank All stored water in Baker tank, sent through 4 water carbon units and then discharged to sewer All solids accumulated in Baker Tank, placed into contaminated soil compound March 14, 2003 Baker Tank removed from site March 17-21, 2003 Completrd compacted backfilling, readied site for resurfacing April 1-4, 2003 Resurfaced with asphalt SITE LOCATION ION AND DESC'RJFPTLON The site address is 1876 Country Club Blvd , Stockton, CA It is located at the southeast corner of the intersection of Mission Street and Country Club Blvd (Figure 1) The property is located in projected Section 4, TIN, R6E of the MDB&M at approximately live feet above mean sea level The north corner of the property at Country Club Blvd and. Mission Road is at N37°58 044' Latitude and W121019 393' Longitude (Delorme sa 7 0) On May 1, 2001 Land Surveyors Kjeldsen, Sinnock & Neudeck, Inc surveyed the Positions, top of casing and surface elevations of all wells associated with this site, see Appendix B Figures 3 has been revised to this new survey along with Table 1 All associated figures showing site conditions are based on the new Figure 3 The property previously contained two 1000 gallon gasoline Underground Storage Tanks (UST's), product dispensers, and associated underground piping (Figure 3) The UST's, dispensers, and piping were removed from the site in 1989 The property owner originally installed five onsite monitoring wells Three additional cluster wells have been installed to aid in the investigation of soil and groundwater conditions at the site Monitor well MW 1 has been destroyed, prior to the pump test LOCAL GEOLOGY AND HYDROGEOLOGY The site is Iocated on surface soils belonging to the Stockton Adobe Clay and Honeycut Clay series They are derived from Recent alluvial fan and floodplain deposits The 40 Feet of explored section consisted of clay and silt overlying interbedded lenses of silty and clayey sands below 12 feet This first sandy formation will be designated the A zone 4 quifer The base of the A zone is at approximately 17 - 18 feet below ground surface (bgs) An aquitard consisting of silty clay approximately 3 to 4 feet thick separates the 5 Update Status March 2003