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Appendix A <br /> typically represent the highest PID reading recorded for each soil boring and the sample <br /> dust above first-encountered groundwater <br /> Stockpiled Drill Cuttings and Soil Sampling <br /> Soil generated during dnllnng 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-contanlinatxon 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 labeled, placed on ice, and delivered to a state-certified <br /> analytical laboratory, along with the appropriate chain-of-custody documentation <br /> Direct Push Technology, Water Sampling <br /> A well known example of direct push technology for water sampling is the Hydropunch® <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 dnll rig A boring is drilled with hollow stem- <br /> augers to dust 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 />