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Soil boring PB-SB-4 was performed along the western wall of the former UST excavation to a <br /> depth of 16 feet bsg The remaining three borings were performed further from the former UST <br /> excavation to a depth of 16 feet bsg <br />' A hydropunch was advanced to a depth of 16 feet bsg in order to collect groundwater samples <br /> The drive casing was withdrawn, exposing the screen interval, between 12 feet and 16 feet bsg <br />' Grab groundwater samples were collected from each hydropunch using a stainless steel bailer <br /> Before collecting each sample, the bailer was decontaminated using a non-phosphate detergent <br />' wash, followed by a methanol rinse and a final water rinse <br />' Undisturbed continuous soil samples were collected to a depth of 16 feet bsg from each soil <br /> boring The samples were collected using a direct-push sampler lined with 4-foot long acetate <br /> sleeves The samples were used for lithological evaluation An intact 6-inch selection of sample <br />' was taken from 10 feet bsg in each of the four borings and used for laboratory analysis <br />' Soil samples selected for laboratory analysis were sealed with teflon tape and end caps The <br /> samples were then appropriately labeled and placed in an insulated chest with ice pending <br />' transport to the laboratory Sample collection, handling, and transport were documented using <br /> chain of custody procedures A copy of the chain of custody is included in Appendix D <br />' In order to minimize the potential for cross contamination between borings, the down hole <br /> equipment was washed after each boring <br />' Groundwater was encountered in the borings at approximately 1 i to 14 feet bsg Upon <br /> completing each boring, a temporary L-inch diameter well casing was set into the borings and <br />' grab groundwater samples were collected via a stainless steel bailer The bailer was <br /> decontaminated before collecting each sample using a non-phosphate detergent followed by a <br />' methanol rinse and a final water rinse After collecting the grab groundwater samples,the <br /> temporary well casings were removed and the borings were then filled to 1-foot bsg with a <br /> concrete slurry The remaining foot was then filled to surface grade with native soil Copies of <br /> the boring logs are included in Appendix C <br /> No petroleum odors or stained soils were encountered during boring advancement or soil sample <br /> collection activities In general, native soil consisted of a tan lean clay throughout each boring <br /> CNCD111_20-0210 SHARPIUSD02-0086 doc 3 <br /> 1 <br />