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20 February 1996 <br /> AGE-NC Project No. 95-0197 <br /> Page 3 of 5 <br /> ' 3.2. COLLECTION OF SOIL SAMPLES <br /> Discrete soil samples were collected at five-foot intervals using a Geoprobe soil sampling assembly <br /> ' loaded with pre-cleaned 1.125-inch by 6-inch brass sleeves. Soil samples were preserved by covering <br /> both ends of brass sleeve with Teflon tape, capping, and sealing with tape. Each sample sleeve was <br /> labeled with the following information: boring location, depth, time, date and sampler's initials. <br /> ' The samples were logged on a chain of custody form, stored in a chilled container and transported <br /> to Castle Analytical Laboratory(CAL)in Winton, California, a state-certified laboratory for analysis. <br /> ' Selected soil samples were analyzed for total petroleum hydrocarbons quantified as gasoline and <br /> diesel(TPH-g and TPH-d),volatile aromatics(benzene,toluene, ethyl benzene and xylenes: BTE&X) <br /> and methyl-tert-butyl-ether (MTBE) in accordance with EPA methods 8015m, 8020 and 8020m, <br /> ' respectively. <br /> ' 3.3. GROUNDWATER SAMPLE COLLECTION <br /> Grab ground water samples were collected from selected probings using a Geoprobe water sampling <br /> assembly. Ground water was encountered in each probing at a depth of approximately 27 feet bsg. <br /> Upon collection,water samples were transferred into three 40-m1 EPA vials containing hydrochloric <br /> ' acid as a preservative, and one 1-liter amber bottle. Each sample was logged on a chain-of-custody <br /> form, placed in a chilled container and transported to a CAL for analysis. Selected samples were <br /> analyzed for TPH-g, TPH-d, BTE&X and MTBE in accordance with EPA methods 5030/8015, <br /> ' 5030/8015m and 602, respectively. <br /> 3.4. EQUIPMENT DECONTAMINATION <br /> All sampling tools and brass sleeves used for sample collection were thoroughly rinsed with clean <br /> ' water after washing with a solution of Alconox. All Geoprobe rods- were cleaned prior to <br /> advancement in each probing. <br /> ' 3.5. BORING LOGS <br /> During drilling activities, sample duplicates were described on boring logs using the Unified Soil <br /> Classification System (USCS), and monitored for the presence of organic vapors using a photo- <br /> ionisation detector (PID: Thermo Environmental 580A, 10.0 eV, calibrated to isobutylene). Boring <br /> ' logs are summarized in Appendix,A. <br />