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All sampling equipment will be cleaned in buckets with brushes and a <br /> trisodium phosphate {TSP) or Alconox solution, then rinsed twice with tap <br /> water. Rinsates will be contained on-site in 55-gallon steel drums until <br /> off-site disposal can be arranged. <br /> Discrete depth groundwater samples will be collected from each boring <br /> using a SimulProbe sampler. Discrete depth groundwater samples will be <br /> collected from up to three locations based on lithologic information <br /> collected. Groundwater samples will be contained in 40-m1 volatile <br /> organic analysis (VOA) vials, pre-preserved with hydrochloric acid, and <br /> sealed without headspace. All samples will be labeled and placed into an <br /> ice chest with wet ice for transport to a state certified analytical <br /> laboratory under chain-of-custody. ASE does not anticipate analyzing any <br /> saturated soil samples, although soil samples collected from the <br /> SimulProbe sampler will be logged by the site geologist. <br /> TASK 4 - ANALYZE THE SOIL AND GROUNDWATER SAMPLES <br /> Analyze one (1) capillary zone soil sample from each boring and up to <br /> three (3) discrete depth groundwater samples from each boring at a CAL, <br /> �, EPA certified analytical laboratory for TPH-G, BTEX, the fuel oxygenates <br /> MTBE, TBA, TAME, DIPE and ETBE, and the alcohols ethanol and methanol <br /> by EPA Method 8260. <br /> TASK 5 - DRILL FIVE SOIL. BORINGS TO APPROXIMATELY 20-FEET BGS AND <br /> CONSTRUCT GROUNDWATER MONITORING 'WELLS IN THE <br /> BORINGS <br /> ASE will drill five soil borings to approximately 20-feet bgs at the site <br /> using a drill rig equipped with 8-inch diameter hollow stem augers (Figure <br /> 3 ) . <br /> The drilling will be directed by a qualified ASE geologist. Undisturbed soil <br /> samples will be collected at least every 5-feet for subsurface <br /> hydrogeologic description and possible chemical analysis. The samples <br /> will be described by the ASE geologist according to the Unified Soil <br /> Classification System. The samples will be collected in brass tubes using a <br /> split-barrel drive sampler advanced ahead of the auger tip by successive <br /> blows from a 140-Ib. hammer dropped 30-inches. Each sample will b e <br /> immediately removed from the sampler, trimmed, sealed with Teflon tape <br /> and plastic caps, secured with duct tape, labeled with the site location, <br /> sample designation, date and time the sample was collected, and the <br /> 574 West Grand Line Road, Tracy, CA Workplan — June 2000 <br /> -5- <br />