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' 6 July 1999 <br /> AGE-NC Project No. 99-0616 <br /> ' Page 3 of 5 <br /> 3.2. SOIL PROBE BORING AND HOLLOW-STEM AUGER BORING <br /> ' On 15 June 1999,one soil probe boring(B-1)was advanced to a depth of approximately 10 feet bsg. <br /> Advancement of the soil probe boring was accomplished utilizing a van-mounted Geoprobe 5400 <br /> equipped with 1.125-inch diameter probe rods and an attached 2.125-inch diameter soil sampler, <br /> using"direct push"technology. <br /> On 18 June 1999, Boring B-2 was advanced using a truck-mounted drilling rig. Boring B-2 was <br /> ' located one foot north of B-1, within the former UST area and was advanced to a depth of 30 feet <br /> bsg. Boring locations are depicted on Figure 2. <br /> ' 3.3. SOIL SAMPLE COLLECTION <br /> ' Discrete soil samples were collected at five-foot intervals beginning at approximately 5 feet bsg. <br /> The Geoprobe soil sampling assembly was loaded with pre-cleaned 1.125-inch by 6-inch brass <br /> ' sleeves. The truck-mounted drilling rig utilized a California modified split-spoon sampler loaded <br /> with 2 by 6-inch brass sleeves to sample soil. Soil samples were preserved by covering both ends <br /> of selected brass sleeves with Teflon sheets,capping, and sealing with tape. Each sample sleeve was <br /> ' labeled with soil 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 a California Department of Health Services (DHS)-certified laboratory for analysis. The samples <br /> were analyzed by the following methods: <br /> ' • EPA Method 5030/8015m for total petroleum hydrocarbons quantified as gasoline(TPH-g), <br /> • EPA Method 8020 for volatile aromatics(benzene,toluene, ethylbenzene, and total xylenes; <br /> ' BTEX), <br /> • EPA Method 8260 for methyl t-butyl ether(MTBE), ethyl-t-butyl ether, (ETBE),t-butanol <br /> ' (TBA), tert-amyl methyl ether(TAME) and dilsopropyl ether(DIPE). <br /> ' 3.4. LOGGING <br /> ' During boring activities, sample duplicates were monitored for the presence of organic vapor using <br /> an organic vapor meter (OVM) and the readings were recorded on the boring logs. Soil sample <br /> ' Advanced GeoEnvironmental, Inc. <br /> 1 <br />