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Mcon <br /> 433 North Market Boulevard • Sacramento California 95834-1943 • (916)928-3300• Fax(976)�:28-3347 <br /> August 4, 1995 <br /> �} Iris � Project 0805-147 01 <br /> Mr Kyle Christie AUG _ 7 1995 <br /> ARCO Products Company <br /> 2155 South Bascom, Suite 202 ENVIRONMENTAL HEALTH <br /> Campbell, California 95008 PERMIT/SERVICES <br /> Re Workplan to Conduct a Preliminary Subsurface Investigation at ARCO Service <br /> Station No 2185 Located at 3212 California Street, Stockton, California <br /> Dear Mr Christie <br /> At the request of ARCO Products Company (ARCO), EMCON has prepared this <br /> workplan to conduct a preliminary subsurface investigation at the subject site (see <br /> Figure 1) The purpose of this investigation is to determine whether site activities <br /> associated with the underground storage tanks (USTs) and fuel dispensers have impacted <br /> soil and groundwater beneath the site Work will include the drilling of five soil borings, <br /> and in the event that hydrocarbons are detected in soil near groundwater, installing three <br /> groundwater monitoring wells and a vapor extraction well <br /> BACKGROUND <br /> The site is located at the southeast corner of the intersection of Alpine Avenue and <br /> California Street in Stockton, California (see Figure 2) Based on information provided by <br /> ARCO and data collected during a site reconnaissance, there appears to be three gasoline <br /> USTs and two fuel dispensers islands at the site There is no evidence of a waste oil tank <br /> at the site. <br /> REGIONAL GEOLOGY AND HYDROGEOLOGY <br /> The site is underlain by the Lower Member of the Modesto Formation, which is of <br /> Pleistocene age Sediments of this formation consist of unconsolidated clay, silt, and sand <br /> (Wagner, et al , 1987) <br /> The site is in the Eastern San Joaquin County Ground-Water Basun (California <br /> Department of Water Resources, 1980) According to this reference, the groundwater <br /> basin has been developed for intensive tmgation, domestic, industrial, municipal, and stock <br /> use Based on regional maps prepared from 1988 groundwater data by the San Joaquin <br /> County Flood Control and Water Conservation District, EMCON expects the depth to <br /> groundwater near the site to be approximately 40 feet below ground surface (bgs), with a <br /> regional direction of flow to the northeast <br /> S-'C1N 1P70\0805108051470 1 AN-94W= 1 <br />