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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 Additional Site Investigation and Groundwater <br /> Monitonng Report, Fourth Quarter 2002 for submittal to the San Joaquin County Environmental <br /> Health Division (EHD) and Central Valley Regional Water Quality Control Board (RWQCB) <br /> The project was completed according to Ramage Environmental's Work Plan, Additional Site <br /> ' Investigation, dated July 16, 2001 EHD approved the work plan on July 25, 2001 A copy of the <br /> work plan approval letter is included in Appendix A <br /> ' 1 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 site is flat, mostly paved and <br /> approximately %-acre in size Recycling centers are located on the east and west sides of the <br /> site South of the site is a city of Manteca bike path and a Union Pacific Railroad right-of-way <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 /> ' 12 Previous Work <br /> 1 2 1 UST System Removal <br /> On November 1, 1988, Tilford & Hall removed the three, 1,000-gallon capacity, USTs and <br /> associated product piping and dispenser island equipment During UST removal, the EHD <br /> inspector noted the presence of corrosion and holes in all three tanks and "prevalent odor" during <br /> ' excavation of the northern weed oil tank <br /> One soil sample was collected from beneath each UST at a depth of 10 to 10 5 feet below ground <br /> surface (bgs), and analyzed for Total Extractable Petroleum Hydrocarbons (TEPH), Total Volatile <br /> Petroleum Hydrocarbons (TVPH), and benzene, toluene, ethylbenzene and xylenes (BTEX) <br /> 5 <br /> 1 <br />