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G 1620 C ExecutiveCourt Sacramento, CA 95864 ENGINEERING AND ENVIRONMENTAL SERVICES Telephone: (916) 485-7222 - FAX: (916)485-8098 PAYMENT PF�%=W=r1k24 October 1997 Mr. Roy Knight, Safety Coordinator/Trainer OCT 2 7 1997 Risk Management Department Stockton Unified School District PUBLIC HEALTH SERVICES 98 South Van Buren Street ENVIRONMENTAL HEALTH DIVIS,u1v Stockton, California 95203 Subject: Proposed Work Plan for Remediation of Storm Drain Inlets Stockton Unified School District Maintenance and Transportation Center HLI 00815 Dear Mr. Knight. As requested, we are submitting this work plan for investigating and remediating soil beneath storm drain inlets located in front of the Lube Shop at the District's Maintenance and Transportation Center. Our work plan includes two phases: the investigation of the drain inlets for the presence of soil contaminated with oils and petroleum fuels (i.e.,. gasoline and diesel) and the remediation of contaminated soil (as warranted) followed by the cleaning of the drain lines. Our work plan includes a discussion of the background of the project, the general approach that will be undertaken for the investigation and remediation activities, and a schedule for implementing the work plan. BACKGROUND It is our understanding that during the repair of a storm drain inlet by a District maintenance worker, a black, odorous material was discovered in and around one of the drain inlets near the Lube Shop. A water layer was noted 4 to 6 inches above this contaminated material which appeared stained and exhibited petroleum odors. The District requested Helmick & Lerner Inc. to collect a sample of the stained material for laboratory analysis in order to characterize chemical constituents that may be present. The sample was collected by hand-driving a steel corer containing a 2-inch diameter brass liner into the soil beneath the water collected at the bottom of the drain. The sample was delivered with a chain-of-custody form to Excelchem Environmental Labs of Roseville, a State-Certified Laboratory, for analysis of the following constituents: