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MW"ERLY GROUNDWATER M011M INQ RE' 1605 South E[Dorado Street,Stockton CalMornia f 1.0 INTRODUCTION This report documents the results of groundwater monitoring conducted on December 17, 1992, by Aegis Environmental, Inc (Aegis), at the Exxon Company, U S A I (Exxon), inactive service station located at 1605 South EI 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 formerly retailed leaded and unleaded gasolines Existing facilites include a building and an open excavation from the removal of three underground storage tanks (UST) and associated piping Figure 2 indicates the I location of the site's current and former aboveground and underground facilities An estimated 500 to 600 yds3 of soil removed during the UST removal are stockpiled and covered with plastic on site 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-dichloroethane, 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 91-044C OMR 1-