Laserfiche WebLink
three shallow borings will be advanced to approximately 2 feet bgs using <br /> a hand auger to collect surface soil samples in areas with heavy truck <br /> traffic. <br /> During drilling, soil samples will be continuously collected in 4-foot <br /> intervals to total depth of the boring using a standard 4-foot-long sampler. <br /> Each soil sample will be described and logged in the field by an ERM <br /> geologist, under the supervision of a California Registered Geologist. <br /> Nondisposable equipment (e.g. drilling and sampling equipment) utilized <br /> during the subsurface investigation will be decontaminated prior to use at <br /> each location and at the completion of field activities. Decontamination <br /> will be performed with high-pressure steam wash or diluted non- <br /> phosphate soap followed by distilled water rinse. Investigative wastes, <br /> including soil cuttings, decontamination water, and purge water, will be <br /> contained on site in 55-gallon steel drums and properly disposed of. <br /> 3.1.3 Groundwater Characterization <br /> After completion of each boring, a temporary well point will be <br /> constructed from 1-inch-diameter polyvinyl chloride (PVC) casing with a <br /> 5-foot PVC screen slotted at 0.01 inch. The well point will be surveyed <br /> following installation and allowed to sit overnight. The static water levels <br /> in the wells will be measured a minimum of 24 hours after installation and <br /> initial development to determine the hydraulic gradient at the site. The <br /> well will be purged of a minimum of 3 volumes of water, with a <br /> disposible bailer or a peristaltic pump, and field parameters (temperature, <br /> pH, and specific conductance)will be measured during sampling. Once <br /> the temporary well point is sampled, the PVC casing and screen will be <br /> removed, and the Geoprobe boring will be filled with bentonite <br /> chips/pellets. <br /> 3.1.4 Laboratory Analysis <br /> ERM will subcontract a California accredited laboratory to complete soil <br /> and groundwater analyses. Approximately 12 soil samples will be <br /> collected from the borings in 4-foot intervals and submitted for laboratory <br /> analysis for the following constituents of concern: <br /> • Organochlorinated Pesticides by United States Environmental <br /> Protection Agency (USEPA) Method 8081; <br /> • Orthophosphorous Pesticides by USEPA Method 8141; <br /> ERM 4 LFSCO,WC/0024301.0-12/2]/09 <br />