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0 ! Preliminary Site Assessment Work Plan 601 MAIN STREET INVESTMENTS, L. P. PROPERTY 601 East Main Street, Stockton,California 1.0. INTRODUCTION At the request of Mr. Cyrus Youssefi representing 601 Main Street Investments, L. P.,Advanced GeoEnvironmental,Inc. (AGE)has prepared the enclosed Preliminary Site Assessment Work Plan for 601 East Main Street, Stockton,California(site). The scope of work includes the advancement of two soil borings for the collection of soil and ground water samples.The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. This work plan was prepared as directed by San Joaquin County Environmental Health Department (SJCEHD) letter, dated 14 November 2007 and Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines for the investigation of underground storage tank(UST)sites. 2.0. BACKGROUND The site is located on the northeast corner of Main Street and American Street in a commercial area of Stockton,California(Figure 1).The site is currently occupied by the Phoenix House,a drug and alcohol treatment center.A former 3,000-gallon heating-oil UST was located in the sidewalk on the north side of Main Street,approximately 100 feet east of American Street(Figure 2). 2.1. UNDERGROUND STORAGE TANK REMOVAL On 02 July 2004,one 3,000-gallon heating-oil UST was removed from beneath the sidewalk on the north side of Main Street,approximately 100 feet east of American Street,Stockton,California.The UST was removed under SJCEHD permit by Jim Thorpe Oil,Inc.The approximate location of the former UST is shown on Figure 2. During the UST removal free product was encountered in the soil underlying the UST in the excavation.Approximately,three to four feet of the saturated soil was removed and placed in a pile (hot pile). Two soil samples were collected from the floor of the excavation beneath the UST at depths of approximately 10.6 feet and 11 feet below surface grade(bsg)on the east and west side of the excavation (TK-land TK-2). One composite soil sample was collected from the soil piles around the UST(SP-1 and SP-2) and a soil sample was collected from the hot pile. Total petroleum hydrocarbons as diesel were detected in the samples collected from the floor ofthe UST excavation at concentrations of 3,700 milligrams per kilogram (mg/kg) and 5,800 mg/kg. Analytical results of the UST removal soil samples are presented in Table 1. Aired Ce En.hvmn.hLls