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I ro Y ' 05 March 2002 AGE-NC Project No 98-0426 ' Page-3 of 6 bentonite chips were poured into the annulus and allowed to settle on the filter pack Five gallons ' of tap water were used to hydrate the bentonite chips for one-half hour prior to grouting The remaining annular space was sealed with portland type LII neat cement mixed with no more than 6 gallons of water per 94-pound sack of cement The grout was placed by pumping through the center ' of the auger while the augers were incrementally raised The as-built monitoring well diagram is presented in Figure 3 I 2 14 Equipment Decontamination ' All hollow stem augers were steam-cleaned prior to advancement in each boring, tools and brass sleeves used were thoroughly washed in a solution of Alconox and rinsed with clean tap water prior ' to each sampling rein ' 2 2 ADVANCEMENT OF SOIL PROBE BORINGS - PHASE Id On 01 to 03 October 2001,AGE advanced three soil probe borings at the site using a van-mounted �. Geoprobe 5400 direct-push probing unit equipped with 1 25-inch probing rods The Geoprobe advances soil probe bonngs using a hydraulic hammer to drive soil and ground water sampling tools to specified depths I I Allrobe borings.were advanced to a total depth of 60 feet bsg Probe boring P-7 was advanced in P g the area of the former USTs, boring P-8 was advanced approximately 20 feet south of P-7 and the UST area and boring P-9, was advanced approximately 60 feet northeast of the former UST area (Figure 2) 2 2 1 Soil and Grab Ground Water Sample Collection tDiscrete soil samples were collected using the Geoprobe push-driven 2-inch diameter soil sampler fitted with four six-inch long brass sleeves at 5-foot intervals, beginning at 5 feet bsg in all soil borings Soil samples were preserved by covering both ends of the second brass sleeve with Teflon sheets, capping and sealing with tape Each preserved sample sleeve was labeled with soil boring location,depth,time,date and sampler's initials and was stored in a chilled container under ice Soil encountered in the borings was visually classified by an AGE geologist in accordance with the Unified Soil Classification System (USCS) Additionally, soil samples were field-screened for the presence of volatile organic compounds using an organic vapor meter(OVM) Selected soil samples ' were logged on a chain-of-custody, transported to a State of California Department of Health • Services (DHS)-certified laboratory and analyzed,for 1 Advanced GeoEnvironmental,Inc I i