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concentrations of petroleum hydrocarbons were present in all borings, but highest in <br /> the soil samples collected from boring B-1, located in the center of the former UST area. <br /> Detailed results are presented in the Preliminary Site Assessment Report by NEI, dated <br /> November 22, 1991 <br /> In July 1992, Tank Protect Engineering (TPE) supervised the drilling of five soil borings <br /> and the installation of five monitoring wells (MW-1, MW-2, MW-3, MW-4 and MW-5) <br /> each to a depth of approximately 90 feet below grade. Detectable concentrations of <br /> petroleum hydrocarbons were present in soil and ground water samples collected from <br /> all monitoring wells, except from MW-5. Depth to ground water beneath the site is <br /> approximately 81 feet below grade, and flows in a southerly direction with a gradient of <br /> 0 0004 feet/feet. Detailed results are presented in the Preliminary Site Assessment <br /> Report by TPE, dated September 3, 1992. <br /> WORK ACTIVITIES: <br /> Permit and drill three additional soil borings, and install monitoring wells MW-6, <br /> MW-7 and MW-8) in locations shown on the attached site plan (Figure 2) The purpose <br /> of these borings and well installations is to determine the lateral extent of the fuel <br /> constituents detected during the preliminary site assessment This effort is necessary to <br /> satisfy criteria established in the LUFT manual for the determination of concentrations <br /> of hydrocarbons that are acceptable to leave in place without remediation <br />• The soil borings will be drilled to approximately 90 feet below ground surface. Soil <br /> samples from each boring will be collected at five foot intervals Soil samples will be <br /> analyzed for concentrations of contaminants detected during preliminary site <br /> assessment (gasoline constituents) A two-inch diameter monitoring wells will be <br /> installed in each soil boring The new monitoring wells will be surveyed relative to an <br /> existing benchmark and developed through a combination of surging and bailing of at <br /> least ten well volumes Ground water samples will be collected from each of the new <br /> and existing monitoring wells during this phase of investigation <br /> IL KEY SAFETY PERSONNEL AND RESPONSIBILITIES <br /> All personnel working for HETI at the job site are responsible for project safety Specific <br /> individual responsibilities are listed below <br /> Project Manager. <br /> The Project Manager is responsible for preparation of this SSP. He/she has the <br /> authority to provide for the auditing of compliance with the provisions of this <br /> SSP, suspend or modify work practices, and to report to the Regional Manager <br /> any individuals whose conduct does not meet the provisions presented in this <br /> SSP. The Project Manager can be reached at (510) 521-2684 <br /> 7-237 2 11/22/93 <br />