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Fifth Amended Permit for Wells and Test Borings-Tower Park Marina <br /> water generated through well development andur ing will be stored on-site in approved 55- <br /> P g <br /> gallon drums pending laboratory analyses to detemiine a proper disposal method. Should the <br /> wells contain free product, the approximate thickness of free product will be measured and <br /> the free product will be hand bailed from the wells prior to development. <br /> All wells will be surveyed for location and elevation relative to an assumed <br /> benchmark by Law/Crandall, Inc: personnel. Ground water elevations will be measured and <br /> y the flow direction will be estimated in order to assess the direction of potential contaminant <br /> migration beneath the site. <br /> Each well will be sampled with a new clear plastic bailer and visually <br /> examined for the presence of floating petroleum product. The approximate thickness of free <br /> product, if present,will be measured. Ground water samples will be collected from wells <br /> which do not contain free product. <br /> Well sampling will be conducted after at least four well casing volumes of <br /> water have been removed, the pH,conductivity and temperature have stabilized, and the <br /> water level has recovered to 80 percent of its initial level. Where water recovery is slow, the ! <br /> sample will be collected after stabilization is achieved and enough water is present to fill the <br /> sample container(s). The sample containers will be sealed and labeled. Appropriate <br /> information,such as time, sampler, approximate depth to water, and visual observations, <br /> will be noted on sampling forms. <br /> C� The ground water samples will be placed on ice in a thermally insulated <br /> cooler, transported to a state certified laboratory under chain-of-custody documentation,and <br /> analyzed for TPH/D,TPH/G and BTEX. <br /> 3a. A free product recovery system will be installed to minimize the spread of <br /> contamination to soil and/or groundwater. The free product recovery system will consist of <br /> shallow trench(es)or sump(s) to collect free product. Approval from Reclamation District <br /> #548 will be obtained prior to construction. Areas where free product was previously <br /> encountered during sampling activities will be excavated using a backhoe. Excavation is <br /> proposed in the following areas: <br /> • Near the manifold; <br /> • Near the gasoline piping trench where the transit pipe <br /> containing free product was initially found; <br /> • Near soil vapor survey locations where free product was <br /> previously found. ! <br /> If free product is found,a shallow trench, with an approximate depth of 4 feet <br /> willbe constructed. Free product will be removed from the trench via an explosion proof <br /> pump or bucket bailing to a containment vessel, such as a 55-gallon drum. The free product <br /> containers will be manifested and transported off-site to an appropriate facility. The initial <br /> width and depth of each trench is expected to be approximately 2 feet- However, a larger area <br /> may be required depending on the volume of product encountered. <br /> Following the initial collection of free product,if any, the bottom of each <br /> C <br /> 2 <br />