Laserfiche WebLink
f • <br /> �I> - CKa- <br /> CLEARWATER <br /> • G R O U •P, I N C, <br /> 2.3b CPT Borings <br /> Soil samples will be collected at five-foot intervals in specified locations to <br /> assess soil contamination in the vadose zone. The soil sampler is pushed <br /> using the weight of the 20-ton CPT rig. Samples are collected in 1.5-inch <br /> diameter 6-inch long stainless steel sample tubes. Soil samples will be <br /> analyzed for TPH as gasoline, TPH as diesel fuel, and BTEX. <br /> At the other locations, only groundwater samples will be collected in an <br /> attempt to identify the lateral limits of dissolved hydrocarbons in <br /> groundwater. Groundwater samples are obtained by pushing 1.75-inch <br /> diameter hollow rods with a steel tip. A filter screen is attached to the tip. At <br /> the desired sampling depth the rods are retracted exposing the filter screen <br /> and allowing the infiltration of groundwater. A small diameter bailer is then <br /> used to collect groundwater samples through the hollow rod. Because of the <br /> small volume of water obtained, the samples will be analyzed for TPH as <br /> gasoline and BTEX only. <br /> After sampling has been completed at each CPT boring, the boring will be <br /> pressure grouted from total depth to ground surface. <br /> The proposed sampling strategy is summarized on the attached table and in <br /> the following section: <br /> Borings CPT-I, CPT-2. and CPT-3: <br /> In borings CPT-1, CPT-2, and CPT-3 soil samples will be collected at five-foot <br /> _intervals (or at significant stratigraphic boundaries) between 15 feet and a <br /> depth that is below the water table. The water level is anticipated to be no <br /> deeper than 55 feet bgs. A maximum of 9 soil samples will be chemically <br /> analyzed from CPT-1 and CPT-2. Soil samples from CPT-3 will be screened <br /> using a flame ionization detector (FID) and up to 4 samples will be submitted <br /> to the laboratory for analyses. Samples will be analyzed on a normal <br /> turnaround-time basis. <br /> Water samples will be collected from CPT-2 and CPT-3 using the CPT rig. The <br /> samples will be analyzed for TPH as gasoline and BTEX. <br /> • <br /> 4 <br /> D105WPAdd 10/95 <br />