ARCHIVED REPORTS_XR0005073 - Laserfiche WebLink

Home Browse Search

' 25 April 2000 AGE-NC Project No. 98-0520 ' Page 2 of 7 n California. Auger returns generated by drilling were placed on plastic sheeting and stored on site " pending laboratory analysis. 3.2. SOIL SAMPLE COLLECTION AND ANALYSIS ' Discrete soil samples were collected ahead of the drill bit using a.California-Modified split-spoon sampler loaded with three pre-cleaned 2-inch by 6-inch brass sleeves. The samples were collected -at five-foot intervals, beginning at 10 feet bsg in borings MW-1, MW-2, MW-3, MW-4 and at 20 feet bsg in MW-5, using a 140-pound hammer to advance the sampler 18 inches. The number of blows required to advance the sampler in 6-inch increments (blow counts) was recorded on the boring logs. ' Soil samples were preseryed by covering both ends of the second r ss sleeve with Teflon sheets , capping and sealing with tape. Each preserved sample sleeve was labeled with soil boring location, ' depth, time, date and sampler's initials and was stored in a chilled container under ice. Soil encountered in the borings were visually classified by an AGE geologist in accordance with the . .Unified Soil Classification System (USCS). Additionally, soil samples were field screened for the ' presence of volatile organic compounds using an organic vapor meter(OVM).Selected soil samples were logged on a chain-of-custody, transported to Alpha Analytical Laboratories, Inc., a State of California Department of Health Services (DHS)-certified laboratory and were analyzed for: 1 • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA ' Method 5030/8015M; • Total petroleum hydrocarbons quantified as motor oil (TPH-mo) in accordance with EPA ' Method 3550/8015M; • Volatile aromatics(benzene,toluene,ethyl benzene and xylene:BTEX)with methyl tertiary butyl ether(MTBE) in accordance with EPA Method 8020; and ' • Fuel oxygenates,including tertiary butanol(TBA),di-isopropyl ether(DIPE),ethyl tert-butyl ether (ETBE), tert-amyl methyl ether (TAME),_and MTBE, with 1,2-Dichloroethane (1,2-DCA) in accordance with EPA Method 8260B. ' 3.3. LOGGING The soil sample duplicates were utilized for field characterization. The soil was screened for the ' presence of organic vapor using an organic vapor meter equipped with a photo-ionization detector (PID: Thermo Environmental 580A, 10,0eV, calibrated to isobutylene), and the readings were ' Advanced GeoEnvironmental,Inc.