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27 July 1999 <br /> AGE-NC Project No. 99-0605 <br /> Page 2of5 <br /> On 30 December 1998, three USTs were removed from the SSSEsite by Stockton Service excavated hydrocarbon-impacted <br /> tion <br /> Equipment Company, Inc. (SSSE). On 19 February 949 <br /> soil from the former UST and dispenser area. AGE personnel were onsite to collect and field screen <br /> soil samples and to direct digging procedures. Six soil samples were collected from the floor and <br /> sidewalls of the excavation. After completion of the interim remediation, the excavation was <br /> backfilled with clean fill material. Based upon the detection of MTBE at concentrations as great as <br /> 14 mg/kg in soil and at depth as great as 18 feet below surface grade (bsg), AGE recommended <br /> further subsurface investigation at the site to determine MTBE impact to soil and ground water. <br /> 3.0. SCOPE OF WORK <br /> Based on analytical results of soil samples collected during the interim soil remediation excavation <br /> procedures, further investigation is needed to delineate the vertical and horizontal petroleum <br /> hydrocarbon-impact at the site. Assessment activities will consist of the following tasks: <br /> • Permitting and pre-field work activities; <br /> • Soil sample collection and analysis; <br /> • Ground water grab sample collection and analysis, if encountered; and <br /> • Report preparation. <br /> 3.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES <br /> Applicable site assessment permits will be obtained from the San Joaquin County PHS-EHD; a <br /> health and safety plan will be prepared in accordance with Occupational Safety and Health Guidance <br /> Manual for Hazardous Waste Site Activities(National Institute for Occupational Safety and Health <br /> Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). Prior to <br /> mobilization, each boring location will be clearly marked and a utility clearance obtained through <br /> Underground Service Alert. <br /> 3.2. SOIL SAMPLE COLLECTION AND ANALYSIS <br /> Initially, AGE proposes to advance five borings at the site to evaluate the lateral and vertical extent <br /> of petroleum hydrocarbon impact. Additional borings may be required to completely delineate any <br /> impacted soil encountered. Proposed soil boring locations are illustrated in Figure 2. <br /> Advanced GeoEnvironmental.Inc. <br />