ARCHIVED REPORTS XR0001295 - Laserfiche WebLink

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ARCO Products Company 3 Former ARCO#4493,245 North Center Street,Stockton,CA July 7,I999 Grease was reported in both samples at concentrations of 247 mg/kg (XL-1-2') and • 71 mg/kg (XL-2-9'). Lead was reported at a concentraton of 21.8 mg/kg (XL-1-2'). Waste-oil UST soil analytical data is presented in Table 2, and soil sample locations are shown on Figure 2. Field and laboratory procedures are presented as Attachment B. Certified analytical reports and chain-of-custody documentation are presented as Attachment C. Remedial Activities - Over-excavation During product line sampling and excavation, an asphalt layer was discovered at a depth of approximately 2 to 3 feet bgs. The asphalt layer was present over most of the site and may have acted as a barrier Iimiting migration veritcally. Soil in the area of the product lines and dispensers was over-excavated down to the asphalt layer. Over-excavation proceeded laterally along the asphalt layer until clean soil was encountered. Approximately 200 cubic yards of soil was removed during the over-excavation process. Eight samples were collected (OE-1 through OE-8) to confirm lateral definition above the asphalt layer. All eigth over-excavation samples were reported as nondetect (Table 3). Over-excavation activities were observed and approved by Ms. Lori Duncan with San Joaquin County Environmental Health Department. Field and laboratory procedures are presented as Attachment B. Certified analytical reports and chain-of-custody documentation are presented as Attachment C. Stockpiled Pea Gravel -Above USTs Approximately 100 yards of pea gravel was generated during the UST excavation and removal. Four discret samples (PG-1 through PG-4) were collected and analyzed for TPH-g, BTEX compounds, and MtBE by EPA Method 801518020, and fuel oxygenates by EPA Method 8260. In addition, one sample (PG-1) was analyzed for total lead by EPA Method 6010. TPH-g and benzene had maximum reported concantrations of 5.08 mg/kg (PG-3) and 0.0226mg/kg (PG-1), respectively. Total lead was reported as nondetect. Based upon the sample results, and with approval from Ms. Lori Duncan of the SJCEHD, the pea gravel was re-used as backfill onsite. Stockpiled pea gravel analytical data is presented in Table 4. Field and laboratory procedures are presented as Attachment B. Certified analytical reports and chain-of-custody documentation are presented as Attachment C. Stockpiled Soil Removal Approximately 365 tons of soil generated during the removal of the underground facilities and the over-excavation activities described above was stockpiled onsite. Composite samples were collected to characterize the soil proir to disposal. Dillard Envorinmental Services hauled 199.72 tons to BFI Landfill in Livermore, CA, 146.68 tons to TSP Landfill in Richmond, CA, and 19.50 yards to Chem Waste Landfill in Kettelman City, CA for disposal. Stockpile analytical data is presented in Table 5. 7G600-022-0 I/PULL.DOC