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02 November 1999 <br /> AGE-NC Project No. 99-0628 <br /> Page 3 of 8 <br /> 4.0. SHALLOW DISPOSAL WELL CLOSURE AND SAMPLING PROCEDURES <br /> _ Each dry well was excavated using a truck-mounted drill rig and 48-inch long bucket-type auger. The <br /> auger was advanced by rotating into each dry well. After filling the bucket with soil cuttings, the <br /> bucket was lifted from the well and the soil released onto a temporary soil stockpile. This process <br /> was repeated until the bottom of each well was encountered at approximately 26 feet. Boring B-1 <br /> was advanced using hollow-stem auger drilling techniques. <br /> 4.1. SOIL SAMPLING PROCEDURES <br /> Relatively undisturbed soil samples were collected from beneath the bottom of each dry well and <br /> boring B-1 using a California modified split-spoon sampler fitted with 2-inch diameter, 6-inch long <br /> brass sleeves. Upon removal from the sampler. the sample sleeves were separated and the exposed <br /> ends of the first sleeve were covered with Teflon sheets, capped and sealed with tape. Additionally, <br /> soil sample duplicates were field screened for the presence of volatile organic compounds using an <br /> organic vapor meter (OVM). <br /> Following sample collection, each preserved sample sleeve was labeled with the dry well <br /> identification number, depth, time, date and sampler's initials. The samples were then placed in a <br /> chilled container under ice for and transported under chain-of-custody to a California Department <br /> of Health Services (DHS)-certified laboratory. <br /> 4.2. EQUIPMENT DECONTAMINATION <br /> All sampling tools used for sample collection were rinsed with clean water after being washed with <br /> a solution of Alconox. <br /> 4.3. BORING ABANDONMENT <br /> Each excavated dry well was permanently sealed to prevent vertical migration of contaminants by <br /> backfilling with cement slurry from the total depth to approximately 3 feet bsg. Boring B-1 was <br /> backfilled with cement from total depth to surface grade. <br /> 4.4. LABORATORY ANALYSIS <br /> Three dry well samples, one discharge line sample and two composite stockpiled soil samples were <br /> Advanced GeoEnvironmental.Inc. <br />