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1.0 INTRODUCTION Ramage Environmental was retained by Wright Environmental Services, Inc (Wright) to prepare this Fourth Quarter 1999 Groundwater Monitonng Report for submittal to the San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) and the Central Valley Regional Water Quality Control Board (RWQCB) The project scope of work was completed in accordance with Ramage Environmental's Work Plan, Environmental Site Investigation, dated October 21, 1998 The Work Plan was reviewed and approved with comments by PHSIEHD on November 30, 1998 1.1 Site Description The former Stefano's Gas Station site is located at 1419 East Charter Way in the city of Stockton (San Joaquin County), California (Figure 1) The site occupies the northeast corner of East Charter Way and Sierra Nevada Street (Figure 2) The property is vacant undeveloped land, bordered to the north by a motel and to the east by a liquor store The site is flat and mostly unpaved Two, 10,000-gallon capacity, underground gasoline storage tanks (UST) and a dispenser island existed at the site The dispenser island was located over the top of the USTs in the central part of the site 1.2 Previous Work On October 27, 1992, the two USTs and associated dispenser island were removed from the site by Falcon Energy Associates (FEA) Three sod samples were collected from beneath each of the USTs and analyzed for Total Petroleum Hydrocarbons (TPH)-as- gasoline, benzene, toluene, ethyibenzene and xylenes (BTEX), ethylene dibromide (EDB) and total lead Laboratory results indicated that TPH-as-gasoline was detected in all six soil samples at concentrations ranging from 1,300 to 4,400 milligrams per kilogram (mg/kg) Toluene, ethyibenzene and xylenes were detected, but benzene was not Total — lead and EDB were detected at concentrations below regulatory action levels On August 17, 1994, FEA drilled one soil boring (designated B-1), near the center of the former UST excavation, to a total depth of 60 feet below ground surface (bgs) Soil samples collected at 30 and 40 feet bgs contained detectable concentrations of TPH-as- gasoline, toluene, ethylbenzene and xylenes Soil samples collected at 55 and 60 feet bgs only contained trace concentrations of xylenes of up to 0 018 mg/kg A groundwater- grab sample collected from B-1 contained 76,000 micrograms per liter (µg11) of TPH-as- 3