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1620 Execu <br /> Court <br /> Sac amentotl CA 95864 <br /> ENGINEERING AND ENVIRONMENTAL SE-RVICES Telephone: (916) 485-7222 <br /> FAX: (916)485-8098 <br /> 13 November 1997 <br /> Mr. Roy Knight, Safety Coordinator/Trainer <br /> Risk Management Department <br /> Stockton Unified School District <br /> 98 South Van Buren Street <br /> Stockton, California 95203 <br /> Subject: Soil Investigation Report for Storm Drain Inlets <br /> Stockton Unified School District <br /> Maintenance and Transportation Center <br /> HLI 00816 <br /> Dear Mr. Knight: <br /> This report presents the results of the soil investigation conducted on 5 November 1997 at the <br /> Stockton Unified School District's Maintenance and Transportation Center located at 1944 N. El <br /> Pinal Drive. The investigation was undertaken to evaluate the vertical and lateral extent of soil <br /> containing hydrocarbons around four storm drain inlets in front of the HVAC Building. Soil <br /> samples were collected for laboratory analysis of petroleum hydrocarbons from fourteen soil <br /> borings drilled around the drain inlets. Based on the results of visual inspection of the soil and <br /> laboratory analysis of soil samples, the report recommends excavating soil directly below the drain <br /> inlets that were found to contain petroleum hydrocarbons. <br /> BACKGROUND <br /> During the repair of a storm drain inlet by a District maintenance worker, a black, odorous material <br /> was discovered in and around one of the drain inlets near the HVAC building. A water layer was <br /> noted 4 to 6 inches above this contaminated material which appeared stained and exhibited <br /> petroleum odors. The District requested Helmick & Lerner Inc. to collect a sample of the stained <br /> material for laboratory analysis in order to characterize chemical constituents that may be present. <br /> The sample was collected by hand-driving a steel corer containing a 2-inch diameter brass liner into <br /> the soil beneath the water present at the bottom of the drain. The sample was delivered with a <br />