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• <br /> Work will be temporarily suspended if VOC vapors exceed the criteria established by the air <br /> pollution control district(STVAPCD). <br /> Vapor suppression will be applied if VOC vapor concentrations at the site exceed 50 parts per <br /> million by volume(ppmv). Dust monitors will be used to record fugitive dust concentrations. <br /> Site work will stop if winds reach a minimum of 25 miles per hour. <br /> Site work will stop or additional mitigation measures will be implemented if elevated levels of <br /> airborne dust occur due to construction activities. <br /> 6.2 STOCKPILE SAMPLING <br /> ROKEN will collect soil samples from each stockpile for disposal profiling. Four(4) samples <br /> per approximately each 200 cubic yards of stockpiled soil will be collected and prepared in the <br /> laboratory as 4-part composite samples to profile the material for off-site disposal. ROKEN <br /> anticipates analysis of approximately seven (7) 4-part composites soil samples. Each sample will <br /> be submitted to a state certified laboratory for the following analyzes: <br /> EPA Method 8260b-VOCs, TPH as Gasoline, 7 fuel additives and lead scavengers <br /> EPA Method 8015M-TPH as Diesel and Motor Oil <br /> EPA Method 6010 - LUFT 5 Metals(Cadmium, Chromium,Nickel, Lead,Zinc) <br /> If the concentrations of regulated compounds detected in the soil exceeds hazardous waste <br /> threshold screening levels then additional analyses may be required to determine whether the <br /> material must be profiled as RCRA Hazardous Waste or California Non Regulated Hazardous <br /> Waste. <br /> Actual quantities and costs for soil disposal will depend on the analytical results obtained from <br /> stockpile composite sampling and the results of confirmation sample analyses <br /> 6.3 SOIL SAMPLING PROCEDURES <br /> Confirmation soil samples will be collected using a drive sampler lined with stainless steel <br /> sample tubes or by hand-driving sample tubes into soil collected in the excavator bucket. Soil <br /> samples will be collected from stockpiles using a drive sampler lined with stainless steel sample <br /> tubes or by hand-driving sample tubes into soil. <br /> Recovered samples will be sealed with Teflon-lined end caps, labeled, and placed into a <br /> refrigerated container for transport under chain-of-custody documentation to a state-certified <br /> laboratory. <br /> Soil samples will be collected, stored,handled, and delivered to the laboratory following EPA <br /> chain-of-custody procedures. The chain-of-custody form will document sample collection times <br /> and date/time when the samples were delivered to the laboratory. <br /> A properly completed chain of custody form will be submitted to the analytical laboratory along <br /> with the sample. The laboratory's assigned number will be properly entered on the form. A <br /> quality control officer at the lab will verify sample integrity proper sample volume, correctness <br /> 10 <br />