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• 15 September 1999 <br /> AGE-NC Project No 98-0592 <br /> Page 4 of 7 <br /> filter pack, a surge block was Inserted Into the PVC casing and was lowered then raised (surged) <br /> repeatedly for approximately 10 minutes Thereafter, the depth to the top of the filter pack was <br /> measured and bentonite chips were poured Into the annulus and allowed to settle on the filter pack <br /> Five gallons of tap water was used to hydrate the bentonite chaps for one-half hour pnor to grouting <br /> The remaining annular space was sealed with portland type I/II neat cement mixed with no more <br /> than 6 gallons of wateT�per 94-pound sack of cement The grout was placed by pumping through the <br /> center of the auger while the augers were Incrementally raised <br /> 3 5 EQUIPMENT DECONTAMINATION <br /> Hollow stem augers used during drilling activities were steam cleaned prior to advancement in each <br /> bore hole Sampling tools and brass sleeves used for sample collection were thoroughly washed in <br /> a solution of Alconox and rinsed with clean tap water pnor to each sampling run Following drilling <br /> activities, rinseate generated from decontaminating the equipment was placed in properly labeled <br /> DOT-approved Model 17H 55-gallon drums and was stored on-site In an area lacking public access <br /> • 4 0. FINDINGS <br /> Soil descriptions, site stratigraphy, and ground water elevations were determined f,om field data <br /> Hydrocarbon-impact to soil and ground water is characterized from laboratory analytical data <br /> 41 SOIL PROFILE <br /> Generally, a light brown to dark brown, damp silty clay, was encountered from surface grade to <br /> depths of approximately 50 feet Trace amounts of white to light brown veins, gray mottling, and <br /> burrows were observed in some samples within 30 feet of surface grade Thin intervals of dark <br /> brown to brown, hard, silty clay was encountered in some borings from approximately 25 feet to 35 <br /> feet bsg A mixture of damp, brown to dark brown, silty sand, sandy silt, and silty clay, was <br /> encountered from approximately 50 feet to 64 feet bsg <br /> Saturated soil was encountered in borings B 1, B2, and B5 at approximately 55 feet bsg Boring logs <br /> are included In Appendix A <br /> i <br /> Arlianced GroEnN ironmental Inc <br />