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Valley Water Treatment Page 5 <br /> Corrective Action Plan <br /> GPE Project No.480.3 <br /> December 12,2006 <br /> ' Upon completion of the excavation and sampling, the pit will be back-filled <br /> with clean fill, and the asphalt pavement will be replaced. The stockpiled <br /> ' soil will be profiled and disposed of at a Class II landfill. <br /> 5.3 Confirmation Soil Sampling and Analysis <br /> tUpon completion of the excavation, soil samples will be collected from each of <br /> the four sidewalls at a point just above the groundwater surface. The <br /> samples will be collected with hand auger soil boring tools. The slide-hammer <br /> driven sampler will be used to collect the samples directly from the sidewalls. <br /> The end of each sample tube removed from the sampler will be sealed with <br /> aluminum foil or Teflon sheets, capped with plastic end caps, secured with <br /> tape, labeled and placed in a cooler at 4° Celsius for transport to the <br /> 1 laboratory using Chain of Custody protocol. Chain of Custody (CofQ forms <br /> are documents used to track the handling of samples. All dates, times, <br /> persons and companies handling the samples will be listed from the time the <br /> ' sample is collected to its ultimate disposal. All soil sampling equipment will <br /> be decontaminated between uses by triple washing. Nitrile gloves will be <br /> worn during sample collection and changed between collection of each <br /> ' sample. <br /> ' 5.4 Pit Dewatering <br /> In an attempt to remove the most severely contaminated groundwater, <br /> ' groundwater will be pumped out of the open pit prior to backfilling. The <br /> water will be pumped directly into a vacuum truck owned and operated by <br /> American Valley Waste Oil Company, for recycling. An estimated 1,000 to <br /> 1,500 gallons of water will be removed in this fashion. <br /> 5.5 Monitoring Well Replacement <br /> Upon backfilling of the excavation, the former monitoring well, MW-1, will be <br /> replaced and designated as MW-1R. <br /> A hollow stem auger drilling rig, owned and operated by C-57 licensed water <br /> well contractor will be used to drill an 8-inch diameter soil boring to a total <br /> depth of 20 feet. All soil cuttings will be placed in drums and temporarily <br /> stored, pending profiling and determination of proper disposal methods. <br /> Below the maximum depth of fill material, the soil boring will sampled at 5- <br /> foot intervals for geological and possible analytical evaluation. The sampling <br /> r2937 Veneman Ave.,#13240 Geo-Phase Environmental Inc. Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209)569-0295 <br />