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1.0 INTRODUCTION SECOR International Incorporated (SECOR) has prepared this report to document recent Ienvironmental field activities conducted at the Jackpot Food Mart located at 1434 West Yosemite Avenue in Manteca, California (Figure 1) The objective of this investigation is to obtain site ' closure by evaluating if hydrocarbon impacted soil defined at the site during previous investigations is being biodegraded by natural processes The investigation involved the preparation of a site- specific health and safety plan, obtaining permits and utility clearance, advancing three geoprobe ' soil borings, the collection and chemical analyses of soil samples, and the preparation of a technical report detailing the findings of the investigation The work was conducted under the direction of a California registered geologist I 2.0 SCOPE OF WORK ' 2 1 Pre-Field Activities Prior to conducting any field work, SECOR prepared a site-specific health and safety plan for ' drilling activities as required by 29 CFR 1910 120 The health and safety plan detailed field procedures regarding various potential safety hazards that may be encountered during site activities All personnel contracted for the field investigation were required to review and understand this plan 1 SECOR obtained the necessary soil boring permits from the San Joaquin County Public Health Services, Environmental Health Division(PHS/EHD) In addition, a utility clearance was conducted to ensure that subsurface utilities were not intercepted during the drilling activities The clearance involved retaining a private locating service for locating and marking underground utilities at the site Additionally, Underground Service Alert (USA) was notified 48 hours before the drilling start ' date for clearing and locating public utilities 22 Geoprobe Soil Bonn ' On July 12, 1996, SECOR supervised the advancement of three geoprobe soil borings at the site The approximate location of these bonngs and other related site features are shown on Figure 2 The locations were selected to be as close as possible to areas previously found to have petroleum ' hydrocarbon impacted soil Geoprobe soil borings GP-1, GP-2, and GP-3, were advanced to 16 feet, 15 feet, and 15 5 feet below ground surface(bgs) respectively All three of the borings were directly pushed into the ground using a Geoprobe Model 5400 truck-mounted sampling ng equipped with ' 1-112 -inch outside diameter steel probes operated by Gregg Drilling & Testing, Inc of Martinez, California I ' 23 Geoprobe Soil Sarn lin Continuous core soil samples were collected using a modified geoprobe barrel sampler containing three, 1-1/4-inch diameter by 6-inch long stainless steel sample tubes, fitted with clear ' polyvinylchlonde (PVC) tubes (inside the stainless steel tubes) The tubes were field screened for volatile organic compounds using a photionization detector (PID) calibrated to an isobutlyene standard These readings and any subjective evidence of petroleum hydrocarbons were recorded on 14341NV RPT SECOR 10714-002 of 1 October 1996 I I