ARCHIVED REPORTS_XR0008924 - Laserfiche WebLink

Home Browse Search

California Products Company nia Cedar p y Additional Soil and Groundwater Investigation I • And Well Survey 1340 West Washington Street, Stockton, CA mylar liner into the soil to the full length of 4 feet at a time Soil samples intended for chemical analyses were cut out of the 4-foot liner and the ends were sealed with Teflon tape and plastic end caps, labeled, logged on a chain-of-custody form and placed on ice for transport to McCampbell Analytical, Inc (MAI) for chemical analyses MAI is a State-licensed laboratory located in Pacheco, California ' RAB Consulting collected grab-groundwater samples from each probe hole by lowering a clean, temporary PVC casing into the borehole The well scree was capped at the bottom and had a screened section from approximately 20 feet bgs to the bottom of the probe hole Groundwater was collected through polypropylene tubing equipped with a bottom ball check-valve allowing water to be lifted through the tubing Groundwater was carefully transferred to sterile, laboratory-supplied sample containers including both 1-liter amber glass bottles and preserved 40ml vials (VOA) for volatile organic compounds The containers were labeled, logged on a chain-of-custody form and placed on ice for transport to MAI Decontamination and Waste Disposal Procedures To minimize the possibility of cross-contamination, all equipment was cleaned before each use and new liners installed every 4 feet, and new casing and tubing was used for each temporary well Paper and plastic waste from sampling and cementing activities were disposed in the onsite • waste disposal bin Wash water was disposed in the plant sanitary sewer Soil and water generated during sampling were disposed by the laboratory under their periodic waste disposal program ' Soil Boring Abandonment Procedures At the completion of each probe hole, the temporary well casings were removed and the probe ' holes were back filled by tremae from the bottom of the hole The tremae pipe was raised in increments as Portland Cement (5 gallons per bag mix) was placed to the base of the probe hole ' The ground surface was restored with fast-setting concrete Sample Analyses and Results ' Chemical Analysis - Soil and grab-groundwater samples were analyzed for total petroleum hydrocarbons (TPH) as diesel (d) and benzene, toluene, ethylbenzene and xylenes (BTEX)by EPA Methods 8015M/8020 Analytical summaries are found in Table 1 and the laboratory ' reports are attached in Appendix A ' Soil Sample Results - During probe logging, sampling, and field screening activities, only two probes (HP-1 at24 0 ft and HP-3 at 23 0 ft) showed signs of positive diesel impact only in the saturated top 1 5 to 2 feet above the clay aquitard Laboratory results confirmed field evidence ' with concentrations of TPHd reported in two of the five soil samples, at concentrations ranging from 51 milligrams per kilogram (mg/kg, (HP-3-23 0' )) to 2 4 mg/kg (HP-1-24 0') Minor amounts of BTEX were detected in sample HP-3-23 0' with benzene at 0 059mg/kg, toluene at ' 0 058mg/kg, ethylbenzene at 0 33mg/kg, and xylene at 0 93mg/kg Soil sample HP-1-24 0' had ' Robert A Booher Consulting 3 November 6,2003