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. r <br /> %W01 'WOO <br /> Appendix B <br /> Stockpiled Drill Cuttings and Soil Sam lin <br /> Soil generated during drilling operations will be stockpiled on-site. The stockpile will be <br /> set on and covered by plastic sheeting in a manner to prevent rain water from coming in <br /> contact with the soil. Prior to collecting soil samples, Delta personnel will calculate the <br /> approximate volume of soil in the stockpile. The stockpile will then divided into sections, <br /> if warranted, containing the predetermined volume sampling interval. Soil samples will <br /> be collected at 0.5 to 2 feet below the surface of the stockpile. Four soil samples will be <br /> collected from the stockpile and composited into one sample by the laboratory prior to <br /> analysis. The soil samples will be collected in cleaned brass, two by six inch tubes using <br /> a hand driven sampling device. To reduce the potential for cross-contanlination between <br /> samples, the sampler will be cleaned between each sampling event. Upon recovery, the <br /> sample container will be sealed at each end with Teflon sheeting and plastic caps to <br /> minimize the potential of volatilization and cross-contanlination prior to chemical <br /> analysis. The soil sample will be Iabeled, placed on ice, and delivered to a state-certified <br /> analytical laboratory, along with the appropriate chain-of-custody documentation. <br /> Direct Push Technolofy,Water Sampling <br /> A well known example of direct push technology for water sampling is the Hydropuncho. <br /> For the purpose of this field method the term hydropunch will be used instead of direct <br /> push technology for water sampling. <br /> The hydropunch is typically used with a drill rig. A boring is drilled with a hollow stem- <br /> augers to just above the sampling zone. In some soil conditions the drill rig can push <br /> directly from the surface to the sampling interval. The hydropunch is conveyed to the <br /> bottom of the boring using drill rods. Once on bottom the hydropunch is driven a <br /> maximum of five feet. The tool is then opened by lifting up the drill rod no more than <br /> four feet. Once the tool is opened, water enters and a sample can be collected with a <br /> bailer or tubing utilizing a peristaltic pump. Soil particles larger than silt are prevented <br /> from entering the tool by a screen within the tool. The water sample is collected, labeled, <br /> and handled according to the Quality Assurance Plan. <br /> Monitoring Well Installation <br /> Monitoring wells will be completed by installing 2- to 6-inch-diameter Schedule 40 <br /> polyvinyl chloride (PVC) casing. The borehole diameter for a monitoring well will be a <br /> minimum of four inches larger than the outside diameter of the casing. The <br /> 2-inch-diameter flush-threaded casing is generally used for wells dedicated for <br /> groundwater monitoring purposes. <br /> A monitoring well is typically cased with threaded, factory-perforated and blank <br /> Schedule 40 PVC. The perforated interval consists of slotted casing, generally with 0.01 <br /> or 0.02 inch-wide by 1.5-inch-long slots, with 42 slots per foot. The screened sections of <br /> casing are factory machine slotted and will be installed approximately 5 feet above and <br /> 10 feet below first-encountered water level. The screened interval will allow for seasonal <br /> fluctuation in water level and for monitoring floating product. A threaded or slip PVC <br /> cap is secured to the bottom of the casing. The slip cap can be secured with stainless <br />