ARCHIVED REPORTS XR0001721 - Laserfiche WebLink

Home Browse Search

r}� (40) • 18 June 1997 AGE-NC Project No. 95-0109 Page 2 of 6 All samples were analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g) and volatile organics (benzene, toluene, ethylbenzene and xylenes; BTE&X) in accordance with EPA methods 5030/8015m, and 602, respectively. Samples were also collected from MW-9 and MW-14 and placed in 40-m1 VOA vials with no added preservative. These two samples were placed in a chilled container and transported under chain-of- custody to A. Keith Kaufman, M.S., in Culver City, California. These samples were analyzed for physicochemical properties and microbiological enumeration. Table 2 and Table 3 summarize the results of these analyses through June 1997. 2.3. PROBING AND SAMPLING On 20 June 1997, two soil probe borings (probings) were advanced at the site using AGE's Geoprobe 5400 probing unit equipped with 1.25-inch diameter probe rods and a 2.15-inch diameter soil sampling assembly. Probing P-20 was advanced approximately two feet south of P-14 and 18 feet northwest of VW-5; probing P-21 was advanced approximately four feet northwest of P-16 and . 20 feet northeast of VW-5. Each probing was advanced to a total depth of 55 feet below surface grade (bsg). Probing locations are shown on Figure 2. Soil samples were collected at 5-foot intervals, beginning at 20 feet bsg, for the total depth of each probing. All samples were collected using the Geoprobe soil sampling assembly loaded with four 1.125-inch by 6-inch brass sleeves. After collection, the ends of the second brass sleeve were covered with aluminum sheets, capped and sealed with tape. The sleeves were labeled, placed in a chilled container and selected samples were transported to MAI under chain-of-custody. A total of seven soil samples were analyzed for TPH-g and BTE&X in accordance with EPA methods 8015m and 8020. Five samples were transported in a chilled container to A. Keith Kaufman and analyzed for physicochemical properties and microbiological enumeration. All probing rods, sampling tools and sample liners used for sample collection were thoroughly rinsed with clean water after washing with a solution of Alconox between each sampling run. All probings were backfilled over their entire depth with Portland cement. 2.4. LOGGING Soil was extruded from the remaining brass sleeves and screened for the presence of organic vapor using a photo-ionization detector (PID: Thermo Environmental 580A, 10.0eV, calibrated to • isobutylene), and the readings were recorded on the boring logs. Soil was described in accordance with the Unified Soil Classification System (see Boring Logs, Appendix Q. AdvancedGeAnviron mental,Inc.