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APPENDIX A Monitoring Well Installation Work Plan Historical Background SUTTER OFFICE CENTER SITE LOCATION The site is located in a commercial area of low topographic relief in central Stockton, California There is one multistory building (242 North Sutter Street) occupied by multiple businesses on the western portion of the site, the remaining portion consists of paved parking Based on review of the Lines of Equal Depth to Groundwater Sprang 1999 map published by the San Joaquin County Flood Control District and Water Conservation Distnct(FCD&WCD),the estimated depth to ground water at the site is 30 feet bsg Review of the map Lines of Equal Elevation of Groundwater Spring 1998(FCD&WCD) depicts the regional ground water flow direction towards the northwest and west Review of previous ground water monitoring at the site and historical depth to ground water maps(FCD&WCD)dating back to 1971 suggests that ground water depth near the site has fluctuated between 50 feet bsg and 60 feet bsg UNDERGROUND STORAGE TANK REMOVAL An unnamed service station operated at the site from the 1940's until the 1960's Reportedly four underground storage tanks (USTs)were filled with sand and abandoned in place in the late 1960's A Standard Oil Service Station operated at the site from the late 1960s until 1980 Subsequently,the USTs associated with this fuel system were removed, the location of the former USTs during this period is uncertain, but is believed to be at the northeast corner of the site A site historical review of City of Stockton street directory records, San Joaquin County Assessors Office indicated that a Chevron gasoline service and filling station operated at the site under the assumed address of 448 East Miner Avenue(242 North Sutter Street) from 1935 until 1941, then a cab car service operated at the same assumed address of 448 East Miner Avenue from 1942 until 1958 In 1967 a Standard Service Station operated at the site under the assumed address of 434 East Miner Avenue, from 1967 until 1980 The property was also occupied by the Continental American Bus Lines depot from 1950 until the late 1960's The operation of four, five-hundred gallon gasoline and/or fuel USTs ended in 1960, at which time the USTs were reportedly closed in place The Chevron dispenser for this tank set was located at the most northeast corner of the site Neither UST decommissioning was verified with soil sample collection Advanced GeoEnvironmental