Laserfiche WebLink
27 October 2003 <br /> • AGE-NC Project No 98-0450 <br />' Page 3 of 17 <br /> ' • Soil boring SB4 was completed in the center of the former UST area as ground water <br /> monitoring well BMW4 The well boring was advanced to a total depth of 65 feet bsg <br /> Subsequently the well bore was backfilled 5 feet with sand, then bentonite chips were used <br /> to make a 5-foot plug from 60 feet bsg to 55 feet bsg above the sand base The boring was <br /> completed with 0 02-inch slotted screen from depths of 45 to 55 feet bsg A filter pack was <br /> Installed in the well from approximately 44 to 55 feet using #3 Lonestar sand Bentonite <br /> ' chips were used to make a 2-foot plug above the sand filter pack The remaining annular <br /> space in the monitoring well boring were backfilled to within one foot the surface with <br /> ' portland cement A traffic-rated well box (8-inch diameter) was Installed over the well, In <br /> accordance with County regulations <br /> • Soil borings SB5 and SB6 were advanced at the approximate ends of the former northern <br /> ' dispenser Island and completed as soil gas/vapor extraction/monitoring wells VW1 and <br /> VW2,respectively The well borings were advanced to total depths of 40 feet bsg and were <br /> completed with 0 02-inch slotted screen from depths of 10 to 40 feet bsg A filter pack was <br /> ' Installed in both wells using#3 Lonestar sand from 10 to 40 feet bsg Bentonite chips were <br /> used to make a 2-foot plug above the sand filter packs <br /> ' . • Boring SBI was advanced to a total depth of 15 feet bsg at the northwestern edge of the <br /> former UST excavation to determine if soil contamination extended laterally north of the <br /> former UST area After soil sampling, the borehole was backfilled to the surface with <br /> ' portland cement In accordance with County regulations <br /> • Soil borings SB2 and SB3 were advanced at a 35° angle from vertical under the property <br /> ' north of the site,to determine the lateral extent of the hydrocarbon impact to soil and ground <br /> water Boring SB2 was advanced to an approximate vertical depth of 55 feet bsg using 65 <br /> feet of augers, boring SB3 was advanced to an approximate vertical depth of 30 feet bsg <br /> ' using 35 feet of augers The annular space was backfilled to the surface with portland cement <br /> in accordance with County regulations <br /> • Soil boring SB7 was advanced to a depth of approximate 55 feet bsg at the west end of the <br /> former southern dispenser island The annular space was backfilled to the surface with <br /> portland cement in accordance with County regulations <br /> ' Soil samples were collected from eachboring at five-foot Intervals,beginning at various depths bsg <br /> In addition,a grab ground water sample was collected from boring SB2 to determine if hydrocarbon <br /> contamination was present, after drilling, ground water was allowed to enter the auger at a depth of _ <br /> approximately 45 feet bsg <br /> ' Selected soil samples and the grab ground water sample were analyzed for contaminants of concern <br /> Three soil samples were transported to an independent microbiologist for physicochemical properties <br /> and microbiological enumeration, and one soil sample was submitted for geotechnical analysis <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br />