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! • February 13, 1989 Spink Corporation Data Review 04650,005.13 Harding Lawson Associates Page 2 Five surface soil samples were composited and analyzed for total recoverable hydrocarbons, CAM 17 metals, semi-volatile organics, and organochlorine pesticides. Total recoverable hydrocarbons were detected at 37 mg/kg in the composite sample. All organic constituents were below detection limits and metal concentrations were similar to background levels. Using soil boring data, the base of the oil reservoir was identified between 7.5 and 9.0 feet below grade. The deepest sample from each boring was analyzed for total recoverable hydrocarbons (TRH), volatile/semi-volatile organics, and CAM metals. The northern half of the AORS averaged 533 mg/kg TRH and the southern half averaged 1849 mg/kg TRH. Volatile and semi-volatile organic constituents were below detection limits. PROPOSED WORK PLAN Task 1: Excavate Test Pits We propose to explore the site by digging six test pits to a depth of 7.5 feet using a backhoe; the pits will be dug along the drainage way adjacent to the proposed extension. Up to three soil samples will be collected at various depths for laboratory analysis. In addition, we propose six backhoe pits to a depth of 2 feet along the alignment with one soil sample to be collected from each shallow pit. The proposed location of deep and shallow backhoe test pits are shown on Plate 2. Soil samples will be collected by driving a 2.5-inch by 6-inch stainless steel tube into the pit sidewall at the selected depth. The sample will be extracted in the tube and the ends covered with Teflon sheets and sealed with plastic caps. The tubes will be labeled and placed in an iced cooler for shipment to a state-certified laboratory, under chain-of- custody procedures for laboratory analysis. The backhoe bucket will be steam-cleaned before and after each use. The pit will be backfilled with the excavated material. Backhoe-excavated pits were selected as the method of exploration because they provide the opportunity to observe a continuous vertical profile of soil from ground surface to the bottom of the AORS. HLA's representative will observe the soil for staining and use an organic vapor analyzer to screen soil samples in the field. On the basis of results, sampling locations can be selected and samples collected for laboratory analysis. Task 2: Conduct Chemical Analyses Up to three samples from the deep backhoe pits--one at 7 feet and 2 at intermediate depths--will be analyzed for TPH as diesel fuel and for total oil and grease. In addition, three select samples will be analyzed for polychlorinated biphenyls (PCBs). One sample from each shallow pit taken from a depth of 2 feet will be analyzed for TPH as diesel fuel and for total oil and grease. A turnaround time of two weeks is standard for the analytical laboratory. Quicker results may be obtained at additional cost.