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1.0 INTRODUCTION <br /> ' On behalf of the San Joaquin County Facilities Management Department (property owner), <br /> Ramage Environmental has prepared this Work Plan, Additional Site Investigation for submittal to <br /> the San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) and <br /> ' the Central Valley Regional Water Quality Control Board (RWQCB) PHS/EHD requested this <br /> work plan on June 5, 2001 <br /> i1 1 Site Location and Description <br /> The site is located at 392 South Moffat Boulevard in the city of Manteca (San Joaquin County), <br /> California (Figure 1) Structures on the property include the former agricultural commissioner's <br /> office, a chemical storage and restroom facility, and a covered vehicle parking area (Figure 2) <br /> The Manteca Police Department currently uses the property The southern part of the site is <br /> secured with barbed-wire fencing and a locked gate The site is approximately '/4-acre in size It <br /> is flat and mostly paved Recycling centers are located on the east and west sides of the site <br /> The Union Pacific Railroad operates within their right-of-way south of the site <br /> Three, 1,000-gallon capacity, underground fuel storage tanks (UST) existed on the east side of <br /> the site (Figure 2) The northern and southern former USTs (Tanks 1 and 3) were used to store <br /> weed oil (i e , diesel fuel) The center UST (Tank 2) was used to store unleaded gasoline <br /> ' 1.2 Previous Work <br /> 1 2 1 UST System Removal <br /> 1 <br /> On November 1, 1988, the three (3), 1,000-gallon capacity, USTs and associated product piping <br /> ' and dispenser island equipment were removed from the site by Telford & Hall During UST <br /> removal, the PHS/EHD inspector noted the presence of corrosion and holes in all three tanks and <br /> "prevalent odor" during excavation of the northern weed oil tank <br /> was collected from beneath each UST at a depth of 10 to 10 5 feet below round <br /> One sad sample p g <br /> ' surface (bgs), and analyzed for Total Extractable Petroleum Hydrocarbons (TEPH), Total Volatile <br /> Petroleum Hydrocarbons (TVPH), and benzene, toluene, ethylbenzene and xylenes (BTEX) by <br /> Canonie Environmental Services Corporation <br /> 4 <br />