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WORK PLAN FOR UST CLOSURE IN PLACE Production Chemical Manufacturing 1000 East Channel Street Stockton, California June 1994 1.0 INTRODUCTION In accordance with a request from Mr. Bob Kubena of Production Chemical Manufacturing, Geological Audit Services, Inc. (GeoAudit) has prepared this Work Plan for UST Closure In Place at 1000 East Channel Street in Stockton, California (the site). The scope of work includes the abandonment of one underground storage tank (UST) in place and drilling and sampling of a maximum of four soil borings. The location of the site is illustrated in Figure 1. A plan of the site is illustrated in Figure 2. 2.0 BACKGROUND 2.1 Site Description The site is located in an industrial/commercial portion of east-central Stockton (Figure 1). The site is currently occupied by Production Chemical Manufacturing, Inc. (PCM). PCM specializes in the manufacturing of car care products. Four above-ground storage tanks (approximately 6,000-gallon capacity) are present at the rear of the site (Figure 2). The above-ground tanks are used to contain paint thinner and kerosene for the manufacturing processes. 2.2 Underground Storage Tank Description It is our understanding that one 1,000-gallon UST is currently located on-site. The UST was used to store unleaded gasoline and kerosene and is located..beneath an above-ground tank. However, according to representatives of PCM, the tank has not been used for storage since July 2, 1993. Upon approval of the San Joaquin County Public Health Services - Environmental Health Division (PHS/EHD), PCM will be abandon the UST in place. The UST is approximately 10 feet in length and 5.5 feet in diameter. The bottom of the UST is at a depth of approximately 8 to 9 feet below surface grade (bsg). G..becal Audit Scr i r Inc. 1 r..d.Ch .Wrasyscs.-W-968-m