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A 13/4-inch by 3-foot acrylic sleeve will be installed inside the sampling barrel of the <br /> drive casing before it is advanced. After being driven 3 feet,the sampling barrel will be <br /> removed from the borehole and the acrylic sleeve containing the soil will be removed <br /> from the sampling barrel. A new acrylic sleeve will be added and the sampling barrel will <br /> be lowered back into the borehole to the previous depth. The drive casing will then be <br /> advanced an additional 3 feet. This process will be repeated until the drive casing reaches <br /> the target depth. <br /> The shallow soil borings will be advanced to approximately 30 feet below ground surface . <br /> (bgs). Temporary 1-inch PVC casing will be inserted into the open borehole to allow for <br /> the collection of groundwater samples. The casing will be slotted from the bottom of the <br /> well to approximately five feet above the first encountered groundwater. <br /> Soil samples for lithologic description will be cut from the acrylic sleeve and visually <br /> described and classified according to,American Society of Testing and Materials (ASTM) <br /> D 2488-93. The entire boring will be described and classified on a boring log. Two soil <br /> samples from each boring will be retained for.analysis, one from the vadose zone and one <br /> from below the groundwater table. <br /> The soil samples collected for laboratory analysis will be retained in the acrylic sleeves, <br /> sealed with non-adhesive tape and plastic end caps, placed on ice, and transported to a <br /> California State-certified analytical laboratory under appropriate chain-of-custody <br /> documentation. Soil samples will be submitted for analysis, as described below. <br /> Following the advancement of the soil borings and the collection of soil samples, <br /> ARCADIS will collect grab groundwater samples from each borehole. The grab <br /> groundwater samples will be collected using decontaminated stainless-steel bailers or <br /> new disposable bailers. The samples will be collected into laboratory provided United <br /> States Environmental Protection Agency (USEPA)-approved containers, labeled,placed <br /> on ice, and transported to a California State-certified analytical laboratory under <br /> appropriate chain-of-custody documentation. <br /> Six subsurface soil samples and three grab groundwater samples will be analyzed for the <br /> following parameters: <br /> ■ Total Petroleum Hydrocarbon(TPH) as Diesel —United States Environmental <br /> Protection Agency (USEPA) Method 8015 <br /> ■ TPH as Gasoline; Benzene, Toluene, Ethylbenzene, and Xylene(BTEX); and <br /> Methyl Tert Butyl Ether(MTBE) -USEPA Method 8260, and . <br /> ■ LUFT Metals -USEPA Method 6010B. <br /> The drilling equipment will be steam cleaned prior to the initial borehole advancement <br /> and between each borehole location. The soil core samplers will be cleaned between each <br />