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• 1.0 INTRODUCTION On behalf of the San Joaquin County Facilities Management Department, Ramage Environmental has prepared this Preliminary Investigation and Evaluation Report for submittal to San Joaquin County Public Health Services Environmental Health Division (PHSIEHD) and to the Central ' Valley Regional Water Quality Control Board (RWQCB) The proposed scope of work was outlined in Ramage Environmental's Work Plan, Environmental Site Investigation, dated June 18, 1997 On July 22, 1997, PHSIEHD approved the work plan A copy of the work plan approval letter is included in Appendix A ' 1.1 Site Description The site is located at 392 South Moffat Boulevard in the city of Manteca (San Joaquin County), California (Figure 1) Structures on the property include a vacant agricultural commissioner's office, a chemical storage and restroom facility, and a covered vehicle parking area The southern part of the site is secured with barbed-wire fencing and a locked gate The site is approximately %-acre in size It is flat and mostly paved Recycling centers are located on the east and west sides of the site The Union Pacific Railroad operates within their right-of-way south of the site Three, 1,000-gallon capacity, underground fuel storage tanks (UST) existed in the southeast portion of the site (Figure 2) The northern and southern former USTs (Tanks 1 and 3)were used to store weed oil (i e , diesel fuel) The center UST (Tank 2) was used to store unleaded gasoline 12 Previous Work On November 1, 1988, three (3), 1,000-gallon capacity, USTs and associated product piping and rdispenser island equipment were removed from the site by Tilford & Hall During UST removal, the PHS-EHD inspector noted the presence of corrosion and holes in all three tanks and "prevalent odor" during excavation of the northern weed oil tank One soil sample was collected from beneath each UST at a depth of 10 to 10 5 feet below ground ' surface (bgs) and analyzed for Total Extractable Petroleum Hydrocarbons (TEPH), Total Volatile Petroleum Hydrocarbons (NPH), and benzene, toluene, ethylbenzene and xylenes (BTEX) by Canonie Environmental Services Corporation Laboratory results indicated that concentrations of 1 i