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TMRD OUAHigtRLY GROUNDWATER h4OWTOFCNG REPORT 1992 1605 South EI Dorado Street.Stockton.CalRomka . 1.0 INTRODUCTION This report documents the results of groundwater monitoring conducted on September 24, 1992, by Aegis Environmental, Inc (Aegis), at the Exxon Company, U S A (Exxon), inactive service station located at 1605 South El Dorado Street in Stockton, California(Figure 1) The monitoring included collection of quarterly depth-to-groundwater measurements and groundwater samples from three wells, MW-1, MW-2, and MW-3, located on site (Figure 2) This report is based, in part, on information obtained by Aegis from Exxon 2.0 SITE DESCRIPTION The 1605 South El Dorado site is located in a commercial/residential area of south Stockton, California (Figure 1) The site is bounded on the north by East 2nd Street, to the east by south EI Dorado Street, to the south by a car wash facility, and to the west by Center Street The Exxon site is an inactive service station that retailed leaded and unleaded gasolines Existing facilities include a building and three underground storage tanks (UST) with associated piping The three UST are located immediately south of the dispenser islands on the southern half of the site Details of the construction and installation of the UST are unknown Figure 2 depicts the location of the sae's aboveground and underground facilities 3.0 BACKGROUND On February 5, 1991, a ground penetrating radar (GPR) survey was conducted at the site by NORCAL Geophysical Consultants, Inc/of Petaluma, California, to locate the UST and piping On February 22, 1991, two angled soil borings were drilled, at 30 degrees from vertical, adjacent to the existing UST basin (Figure 2) The actual vertical boring depths were approximately 53 feet below surface Soil samples collected from the two borings were analyzed for total petroleum hydrocarbons (TPH), as gasoline, and benzene, toluene, ethylbenzene, total xylenes (BTEX), ethylene dibromide, 1,2-dichlowethane, and total lead Results of the soil boring and sampling were reported by Aegis to Exxon, in a "Pre-Tank Replacement Site Assessment Results Report," dated March 5, 1991 On July 2 and 3, 1991, Aegis conducted a soil boring investigation and installed monitoring wells MW-1, MW-2, and MW-3 Results of the investigation were reported by Aegis to Exxon in a "Phase I Subsurface Investigation Results Report," dated September 13, 1991 91-0446 OMR 1