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f <br /> r � <br /> l <br /> Mr. Harlin Knoll, SJCEHD June 18, 2007 <br /> Well Installation Work Plan <br /> A.Teichert and Sons Property, Stockton,CA <br /> Page 2 <br /> the warehouse are paved with concrete, and a steam cleaning station is situated in the <br /> southwestern corner of the site. Gasoline, diesel fuel, and waste oil were formerly stored <br /> in underground storage tanks (USTs) at the site. All USTs and associated fuel dispensers <br /> were removed from the property between 1986 and 1999. Approximate locations of the <br /> former and existing facilities are shown on Figure 2. <br /> BACKGROUND <br /> Assessment of petroleum hydrocarbon impact was initiated in December 1986, following <br /> the removal of select site USTs in October 1986. The following subsections summarize <br /> f historical activities completed at the site, and information regarding site geology and <br /> hydrogeology, remediation activities at the property, and remaining impact in the site <br /> vicinity. <br /> Historical Summary <br /> • Two fuel tanks failed a tightness test in February 1986. Triangle Construction <br /> (Triangle) removed these two 5,000-gallon gasoline USTs (Tanks A and B, <br /> Figure 2) and a 1,000-gallon waste oil UST (Tank C) in October 1986. <br /> • J.H. Kleinfelder and Associates (Kleinfelder) advanced soil borings B-1 through <br /> B-5 to approximately 35 feet below ground surface (bgs) in December 1986. <br /> • Kleinfelder advanced borings B-6 through B-16 in January 1987. Three of the <br /> borings were converted to groundwater monitoring wells (MW-1 through MW-3). <br /> • L.B.M.E. Corporation (LBME) installed wells MW-4 and MW-5 in September <br /> 1987. Well MW-2 was properly destroyed to accommodate.planned remedial <br /> excavation activities.' <br /> • LBME excavated hydrocarbon-impacted soil and collected confirmation soil <br /> samples from the pit in September 1987. The resulting pit was 47 feet by 25 feet, <br /> by 38 feet deep (refer to Figure 2). <br /> • Elder Engineering (Elder) removed one 10,000-gallon gasoline UST (Tank D) in <br /> June 1988. Compliance soil samples were collected by LBME. <br /> • Triangle installed one new 12,000-gallon double-walled gasoline UST and one <br /> 1,000-gallon double-walled waste oil UST in August 1988. i <br /> • LBME installed monitoring wells MW-9, MW-10, and MW-11, in March 1990. 1 <br /> • EMCON Associates (EMCON) advanced boring B92-1 and installed wells <br /> MW 12 and MW-13 in August 1992. <br /> • EMCON performed a soil vapor extraction (SVE) test using well MW-13 and the <br /> existing vapor extraction grid in October 1992. <br /> K:1TeichertlStockton-10Mork Planslteichcrt-well install work plan 06-2007.doc 57Ri47U$ <br />