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Quik Stop Station No 039 October 27 1999 Stockton California _ PSA Work Plan _ The scope of work described in this work plan is intended to comply with the Tri-Regional Guidelines, and the SJCPDH-EHD guidelines Horizon Environmental Inc Field Methods and Procedures are included in Appendix B of this Work Plan SITE DESCRIPTION AND BACKGROUND The site is a convenience market and gas station located on the eastern corner of the intersection of East Fremont Street and E Street in a commercial and residential area in the city of Stockton, California (Figure 1) The city of Stockton is located in the Central Valley geomorphic province of California The site elevation is approximately 22 feet above mean sea level (msl) Regional groundwater flow is estimated to be toward the southwest in the area of the site Groundwater is estimated to range between approximately 40 to 50 feet below surface grade (bsg) in the site area, based on previous work in the area by Horizon i In November 1998, two USTs (T-1 and T-2) were removed from the site Upon removal, each UST appeared to be in relatively good condition with no noticeable holes and light to moderate rusting and pitting USTs T-1 and T-2 (from south to north), were both of single- walled, steel construction with 10,000-gallon capacities, and located in the middle area of the station property Tank T-1 was reportedly used to store leaded gasoline and tank T-2 was reportedly used to store unleaded gasoline The pump dispenser island was located 20 feet east of the eastern ends of the two USTs The location of the Quik Stop market building, two former USTs, the former dispenser island, and other pertinent site features are shown on the Site Plan (Figure 2) Analytical results for soil samples collected from beneath the former gasoline USTs indicated that concentrations of Total Petroleum Hydrocarbons as gasoline (TPHg), the volatile gasoline constituents Benzene, Toluene, Ethylbenzene, and total Xylenes (BTEX) and the seven oxygenated fuel additive compounds methyl tertiary-butyl ether (MTBE), di- isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether • 7039-12 wp 2 HORIZON ENVIRONMENTAL INC