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25 October 2001 <br /> AGE-NC Project No 97-0301 <br /> ' Page 3 of 7 <br /> i <br /> separated by significant intervals of finer-grained, less permeable soil Generally,First Water Zone <br /> ' was identified at depths between 35 feet bsg(first encountered ground water)and 55 feet bsg,Second <br /> Water Zone was identified at depths between 60 feet bsg and 80 feet bsg, Third Water Zone was <br /> ' identified at depths between 90 feet bsg and 100 feet bsg and Fourth Zone Water was identified at <br /> depths between 110 feet bsg and 125 feet bsg <br /> ' 2 4 CPT DRILLING AND GROUND WATER COLLECTION PROCEDURES <br /> ' A 25-ton truck-mounted CPT drill ng equipped with 2-inch diameter hollow-stem rods fitted with <br /> a HydroPunch ground water sampling tool utilized a hydraulic ram to advance to specified depths <br /> in each adjacent soil boring A HydroPunch sample tool was pushed into the specified zone, then <br /> ' withdrawn approximately three feet to expose an inlet screen The interior of the sampling tool filled <br /> with water and a %Z-inch outer diameter (O D ) stainless steel bailer was lowered and utilized to <br /> extract a ground water sample Ground water samples were collected from each selected depth <br /> interval(zone)based on previously acquired CPT-hthology data indicating favorable conditions for <br /> sampling ground water in each identified informal hydrologic unit <br /> All rmseate generated by drilling related activities was contamenzed in properly labeled DOT- <br /> approved 55-gallon drums, and was stored on-site in an area lacking public access All soil borings <br /> ' were backfilled over their entire depth with a portland cement grout mix <br /> Following sample collection, each properly labeled water sample was logged on a chain-of-custody <br /> ' form, placed in a chilled container and transported to a California Department of Health Services <br /> (DHS)-certified laboratory for analysis for <br /> ' • Total petroleum hydrocarbons quantified as gasoline, diesel and motor oil (TPH-g, TPH-d <br /> and TPH-mo, respectively) by EPA Method 5030l8015M, <br /> • Volatile aromatic compounds including benzene,toluene, ethylbenzene and xylene (BTEX) <br /> ' by EPA Method 8020, and <br /> • Volatile organic compounds including methanol, ethanol, ethylene dibromide (EDB), 1,2- <br /> ' dichloroethane(1,2-DCA),tertiary butanol(TBA),di-isopropyl ether(RIPE), ethyl tert butyl <br /> ether (ETBE), tert amyl methyl ether(TAME) and methyl tertiary butyl ether(MTBE)by <br /> EPA Method 8260 <br /> 25 LABORATORY RESULTS OF "GRAB" GROUND WATER SAMPLES <br /> A total of twenty-five"grab"ground water samples were collected from P-5, P-6,P-7, P-8, P-9 and <br /> Advanced GeoEnvironmental,Inc <br />