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1.0 INTRODUCTION Ramage Environmental was retained by Wright Environmental Services, Inc (Wright) to prepare this Groundwater Monitonng Report, Third Quarter 2002 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) ' 1.1 Site Location and 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 is flat, mostly unpaved and 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 San Joaquin County Fairgrounds are across Charter Way to the south of the site (Figure 3) Two, ' 10,000-gallon capacity, underground gasoline storage tanks (UST) and an above-tank dispenser island existed in the central part of the site ' 12 Previous Work 1 2 1 UST System Removal and One Soil Boring On October 27, 1992, the two USTs and dispenser island were removed from the site by Falcon Energy Associates (FEA) Three soil samples were collected from beneath each of the USTs and analyzed for Total Petroleum Hydrocarbons (TPH)-as-gasoline, benzene, toluene, ethylbenzene ' and xylenes (BTEX), ethylene dibromide (EDB) and total lead The laboratory results indicated that TPH-as-gasoline was detected at concentrations ranging from 1,300 to 4,400 milligrams per ' kilogram (mg/kg) On August 17, 1994, FEA drilled one soil boring (designated B-1), near the center of the former ' UST excavation (Figure 2), 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 (µg/1) of TPH-as-gasoline, 38 µg/l of benzene, 310 µg11 of toluene, 4 8 ofµg11 ethylbenzene and 6,800 µg/l of xylenes 3