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�. <br /> PRE-TANK REPLACEMENT SITE ASSESSMENT <br /> i zy RESULTS REPORT <br /> f 1603 S.El Dwado,Stockton,canferrwa <br /> Page 7 <br /> 1A <br /> I . <br /> This report presents the results of the pre-tank replacement site <br /> _ assessment performed by Aegis Environmental, Inc. (Aegis) at the <br /> Exxon Service Station 7-0137. The site is located at 1605 South El <br /> Dorado Avenue, in the City of Stockton, San Joaquin County, <br /> {" California (Figure 1) . <br /> 1.1 Pu 0 use <br /> The purpose of the site assessment was to: <br /> . �., a Preliminarily characterize the site geologic and hydrageologic <br /> conditions; <br /> o Identify if petroleum hydrocarbons are present in the soil <br /> fuel storage tank (UST) <br /> beneath the existing underground <br /> L basin; and <br /> o Evaluate the passible need for further assessment and/or <br /> mitigation of petroleum hydrocarbons in soil and ground water <br /> beneath the site. <br /> 14•� <br /> 1.2 Scope <br /> The scope of work is summarized below. <br /> epi <br /> o A Ground Penetrating Radar (GPR) survey was performed by <br /> r� NORCAL Geophysical Consultants, Inc. of Petaluma, California <br /> on 5 February 1991. The survey was performed in the area of <br /> the existing UST basin and provided information regarding <br /> locations of existing underground facilities for avoidance <br /> during drilling. A copy of NORCA]L's report is included as <br /> Appendix D. <br /> a Two soil borings were drilled on 22 February 1990, at an angle <br /> Of 30 from vertical, adjacent to the existing UST basin. The <br /> borings were advanced using 8"-diameter hollow-stem auger. A <br /> 4 total of 60 feet of auger was utilized in each boring, with a <br /> final sample drive of 18-inches achieving a total depth of pt <br /> feet along the 300 <br /> e borings <br /> The s was approximately 53 tual 53tica <br /> feet below <br /> penetrated by th <br /> existing rade. <br /> g g <br /> 9012055.RPT - - - <br />