ARCHIVED REPORTS XR0001886 - Laserfiche WebLink

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Phase II Contaminant Delineation Investigation Central California Traction Company ' 1645 Cherokee Lane,Stockton, CA Hydro-Environmental Technologies, Inc 20 SUBSURFACE SOIL AND GRAB GROUND WATER INVESTIGATION ' HETI has been requested by the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD), to conduct an additional investigation to determine the extent of soil and ground ' water contamination in the area of the former tank excavation at the subject site The approved work plan is Appendix A ' The field investigation and sample analysis was conducted in accordance with approved U S Environmental Protection Agency (USEPA) methods, California Code of Regulations (CCR) Title 23 procedures, and guidelines from the PHD/EHD This subsurface investigation was conducted under the ' supervision of a California Registered Geologist (R G ) Figure I is a site location map, and Figure 2 is the DP soil boring and grab ground water sample locations map 2.1 Health and Safety Plan For this investigation, HETI personnel prepared a site specific health and safety (H&S) plan in accordance with the requirements of the USEPA 29 CFR 1910 120 and California Cal-OSHA GISO 5192 All on-site HETI and subcontractor personnel were required to adhere to the H&S plan and were required to have had 29 CFR 1910 120 tiaimng and its annual update The HETI project manager had the ' appropriate 29 CFR 1910 120 and California G1SO 5192 eight-hour supervisor's course 22 Utility Clearance ' Prior to any soil boring, digging, trenching, or subsurface investigation, HETI contacted Underground Service Alert (USA) to clear the areas for utilities or other unknown buried obstructions (USA No ' 0206949) 23 Direct Push Drilling ' Between June 8 and 11, 2004, HETI contracted with Tiansglobal Environmental Geochemistry (TEG) to bore through the surface soil using a Strataprobe direct push (DP) drilling rig to ground water Soil samples were collected at 5 0 foot intervals to 50 feet bsg (saturated soil is typically found at ' approximately 45 to 50 feet bsg) Soil samples were collected in polyethylene sleeves that were sealed with Teflon sheets before being capped and placed on ice Boring logs are included in Appendix B ' TEG then installed a temporary PVC casing with the screened interval from 40 to 50 feet bsg to collect a grab ground water sample One grab ground water sample was collected from each DP locations through a stainless steel bailer The samples were not filtered Ground water samples submitted for analysis were 4