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Water Boards V ="^'=-°•"•- Central Valley Regional Water Quality Control Board - TO: Case File:Vintage Car Wash FROM: James L.L. Barton,P.G. 601 East Miner Avenue Engineering Geologist, Stockton,San Joaquin County DATE: 13 May 2013 SIGNATURE: SUBJECT: UST CASE CLOSURE,VINTAGE CAR WAS1601 EAST MINERAVENUE, STOCKTON,SAN JOAQUIN COUNTY(CASE#390705) Site Background The former Vintage Car Wash(Site)was a commercial fueling station with a car wash located at 601 East Miner Avenue in Stockton,San Joaquin County(Figures 1 and 2). The former car wash building,the patiolbuilding and small building to the west of the car wash(all Site buildings,Figure 3)were demolished in 2000 by a State contractor;while an adjacent property building to the south that faced East Miner Avenue was demolished after 2008. The Site is currently a vacant,iregulady shaped(dogleg)lot that is fenced to restrict access,and adjacent to a church and parochial school to the north across Lindsay Street,multi-family residences to the northwest along Lindsay and North American Streets,and several businesses to the northeast,east,and southeast along Lindsay and Stanislaus Streets and Miner Avenue. A vacant lot is to the south along Miner Avenue. Product reconciliation records submitted to the San Joaquin County Environmental Health Department(SJCEHD)reported an approximately 3,200 gallons of gasoline loss between October 1990 and December 1990,with 1,508 gallons of leaded gasoline and 1,692 gallons of unleaded gasoline. The unleaded gasoline was released from a leaking underground storage tank(UST),one of three USTs at the Site. The leaded gasoline leaked after being transferred from a leaded gasoline UST to the leaking unleaded gasoline UST in November 1990. Three monitoring wells(MW-1 through MW-3)were installed around the USTs and one soil boring (ESB-1)was advanced in March 1992(Figure 4). After free product was discovered in MW-1 through MN-3,the consultant bailed MW-1 through MW-3 thirteen times from March 1992 until April 1994(32 gallons Louth,when measurable free product was no longer present in the wells. In May 1993,one 5,000-galloa leaded gasoline UST and two 10,0009a11on(regular unleaded and super unleaded)gasoline USTs were removed from the Site,(Figure 4). The SJCEHD reported the presence of a circular 7/8'diameter hole in the bottom of the northernmost 10,000-gallon regular unleaded gasoline UST,directly below the product fill cap. Although no evidence of a soil pile remains at the Site,the fate and quantity of the excavated soil from the USTs removal is not discussed in the available reports.