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' IS March 1996 <br /> AGE-NC Project No 95-0105 <br /> ' Page 4 of 7 <br /> ' probing P5 was advanced to a depth of 10 feet bsg, and probing P6 was advanced to a depth of 11 <br /> feet bsg <br /> ' Discrete sod samples were collected in each probing at 2-foot intervals beginning at a depth of 3 feet <br /> bsg using a 1 375-inch diameter, two-foot long, piston type sampler loaded with four precleaned 6- <br /> inch brass sleeves The sampling equipment was washed in an Alconox solution and rinsed with water <br /> ' prior to each sampling run to avoid cross-contamination <br /> Upon sample retrieval, both ends of the second brass sleep a were covered with Teflon sheets, capped <br /> ' and sealed with tape Samples were then placed in a chilled container and transported under chain-of- <br /> custody procedure to Alpha Analytical Laboratories (AAI.) in Ukiah, California <br /> 1 <br /> 3 3 2 SOIL LOGGING <br /> ' Soil was extruded from the remaining brass sleeves and screened for the presence of organic vapors <br /> using a photo-ionization detector (PID Thermo En-vironmental 580A, 10 0 eV, calibrated to <br /> isobutylene), and the readings were recorded on the Boring Logs (Appendix B) The soil was <br /> described in accordance with the Unified Soil Classification System <br /> 3 3 3 GRAB GROUND WATER SAMPLE COLLECTION <br /> ' Grab ground water samples were collected from probings P1, P3, P4, P5, and P6 using a Geoprobe <br /> water sampling assembly Probe rods were extended into ground water, then pulled back to expose <br /> a water sampler screen interval Ground water was allowed to enter the sampler, and samples were <br /> ' retrieved using a modified tygon tubing bailer <br /> Ager sample retrieval, the sampler was disassembled and cleaned between each sampling event New <br /> PVC tubing was used for each sample Samples were collected in 40-m1 EPA vials preserved with <br /> hydrochloric acid and 1-liter amber bottles The samples were placed in a chilled container and <br /> transported under chain-of-custody to AAL for analysis <br /> ' 3 3 4 LABORATORY ANALYSIS <br /> Selected soil and ground water samples were analyzed for total petroleum hydrocarbons quantified <br /> as gasoline and diesel (TPH-g and TPH-d), volatile aromatics (benzene, toluene, ethyl benzene and <br /> ' xylenes BTE&X) and methyl-tert-butyl ether (MTBE) Soil samples were analyzed in accordance <br /> with EPA methods 5030l8015m, 8020 and 602, ground water samples were analyzed in accordance <br /> ' with methods 5030 and 602 <br /> 1 <br />