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i 09 September 1996 AGE-NC Project No 95-0173 Page 3 of 8 " ' a depth of 55 feet bsg, and B-2 was advanced to a depth of 60 feet bsg During drilling activities, cuttings were stockpiled on plastic sheeting, whsle rinseate was placed in properly labeled D O T model 17H 55-gallon drums and stored on-site in an area inaccessible to the general public The boring locations are depicted on Figure 2 Discrete soil samples were collected at five-foot intervals, beginning at 15 feet bsg, utilizing a ' California split-spoon sampler and brass sleeves The sampler was driven by dropping a 140-pound weight from a height of 30 inches The number of blows required to drive each 6-inch length of the sampler (blow counts) was recorded on boring logs by an AGE staff geologist ' sample Upon le retrieval, the middle brass sleeve was removed from the sampler Both ends of the p p sleeve were covered with Teflon sheets, capped and sealed with tape Each sample was labeled with ' the following boring location, depth, time, date, and sampler's initials The samples were placed in a chilled container and transported under chain-of-custody protocol to a California state certified laboratory Selected soil samples were analyzed for total petroleum hydrocarbons quantified as ' gasoline and diesel (TPH-g and TPH-d), volatile aromatics (BTE&X), methyl tertiary butyl ether (MTBE), and total lead in accordance with EPA methods 5030/8015M, 8020 and 6010, respectively The results of the laboratory analysis are contained in Table 2 -Analytical Results Of Sail Samples 3 3 EQUIPMENT DECONTAMINATION Hollow stem augers were steam cleaned prior to any boring advancement Sampling tools and brass sleeves used for sample collection were thoroughly washed with a solution of Alconox, and rinsed ' twice with clean tap water prior to each sampling run ' 34 BORING LOGS ' During drilling activities, sample duplicates were described on boring logs using the Unified Soil Classification System (USCS), and monitored for the presence of organic vapors using a photo- ionization detector(PID Microtip HL-2000, calibrated to isobutylene) Boring logs are summarized in Appendix A 3 5 MONITORING WELL INSTALLATION Soil borings MW-1 through MW-4 were completed as 2-inch diameter ground water monitoring wells When the total depth of the boring was achieved, a well casing was emplaced through the hollow stem of the augers The augers were incrementally raised as a 43 Lonestar Lapis Luster sand ' was slowly poured down the annulus between the well casing and the inner wall of the hollow stem