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Samples will be collected at 1 and 5 feet below ground <br /> surface in all borings to observe lead concentrations and <br /> at approximately 15 feet or within native soils immediately <br /> below fill material in four borings to provide information <br /> on stratigraphy and native soil conditions. <br /> Samples will be collected using a 2-inch diameter by 18- <br /> inch long modified California split spoon sampler lined <br /> with 6-inch long thin-walled brass soil tubes. The sampler <br /> will be driven its entire length into undisturbed soil by a <br /> 140-pound drop or hydraulic hammer. <br /> Prior to sample collection, the sampler will be decontami- <br /> nated by washing in a solution of trisodium phosphate (TSP) <br /> and tap water and double rinsed in tap water. Augers will <br /> be decontaminated between borings using a high-pressure <br /> steam cleaner. Water generated during decontamination will <br /> be contained and stored in 55-gallon labelled drums on site <br /> and properly disposed at a later date with authorization <br /> from RWQCB staff. <br /> After sample collection, borings will be backfilled with <br /> bentonite and/or neat cement slurry pursuant to County <br /> requirements. <br /> 2 . 0 Sample Preservation/Transport/Chain-of-Custody <br /> Samples will be capped with aluminum foil and plastic end <br /> caps and taped with duct tape. Samples will be placed in <br /> plastic bags and sealed before placement in an ice chest <br /> with frozen blue ice. Accepted industry and EPA standard <br /> protocol and strict chain-of-custody will be observed <br /> during sample collection and shipment to a laboratory <br /> certified by DHS for hazardous waste analysis. <br /> 3. 0 Sample Analysis <br /> Samples will be analyzed for total lead concentrations by a <br /> laboratory certified by the State Department of Health <br /> Services for hazardous waste. Samples will be preserved by <br /> the lab for subsequent analysis of soluble lead if required <br /> after evaluation of the total lead data. <br /> 4 . 0 Health and Safety <br /> All personnel within the investigation area will be re- <br /> quired to have completed the OSHA 40-hour health and safety <br /> training pursuant to 29CFR 1910 . Inorganic lead is the <br /> constituent of concern. The Material Safety Data Sheet for <br /> lead is attached to this plan. Allowable standards for <br /> lead would not be exceeded without exceeding the allowable <br /> limits for nuisance dust of 10 mg/m3 . Engineering controls <br /> 2 <br />