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1 • 10 INTRODUCTION On behalf of the San Joaquin County Facilities Management Department (property owner), ' Ramage Environmental has prepared this Sensitive Receptor Survey and Groundwater Monitoring Report, First Quarter 2001 for submittal to the San Joaquin County Public Health Services Environmental Health Division (PHSIEHD) and 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 ' 11 Site Location and 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 the former agricultural commissioner's ' office, a chemical storage and restroom facility, and a covered vehicle parking area (Figure 2) The Manteca Police Department currently uses the property 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 on the east side 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 1 2 1 UST System Removal ' November 1 1988 the three 3 , 1,000-gallon capacity, USTs and associated product piping On ( ) and dispenser 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 3