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Mr Jeffery Wong <br /> April 21, 1999 <br /> Page 2 <br /> Following excavation and soil sampling,the excavations were backfilled with approximately <br /> 200 cubic yards of soil from the UST excavation stockpile Based on earlier, soil stockpile <br /> sample results, this soil was deemed suitable for on-site re-use as backfill material During <br /> backfilling,the equipment operator compacted the backfill material with the backhoe bucket <br /> To characterize the soil stockpile generated from the canopy support over-excavation, <br /> Ramage Environmental collected eight soil samples from the stockpile for two-in-one lab <br /> composite and analysis To characterize another soil stockpile of approximately 50 cubic <br /> yards on the south side of the site, Ramage Environmental collected two soil samples from <br /> the stockpile for two-m-one lab composite and analysis This soil (south stockpile) was <br /> generated from earlier UST excavation activities Following sampling, the canopy support <br /> over-excavation soil stockpile was covered with plastic sheeting <br /> All of the soil samples were collected in brass sample tubes, sealed with Teflon®paper and <br /> plastic end caps, labeled, and transported in an iced cooler under chain-of-custody <br /> documentation to Kiff Analytical, LLC, a state of California certified hazardous waste testing <br /> laboratory (Certification#2236) Kiff analyzed each of the soil samples and soil sample <br /> composites for Total Petroleum Hydrocarbons (TPH)-as-gasoline, benzene, toluene, <br /> ethylbenzene, xylenes (BTEX), methyl tertiary butyl ether(MTBE), di-isopropyl ether <br /> (DIPE), ethyl tertiary butyl ether(ETBE), tertiary amyl methyl ether(TAME) and tertiary <br /> butanol (TBA) by EPA Method 8260B and for total lead by EPA Method 6010 <br /> Results of the soil sampling and analysis indicate that the soil beneath the east side of the <br /> former eastern canopy support has been impacted by aged gasoline The soil sample E-E-14 <br /> contained 3,400 milligrams per kilogram (mg/kg) of TPH-as-gasoline and 400 mg/kg of <br /> xylenes Benzene, toluene, ethylbenzene, oxygenates and total lead were not detected in this <br /> soil sample According to Mr Joel Kiff of Kiff Analytical,the chromatogram for this sample <br /> indicated that the detected gasoline is aged The three other soil samples collected from the <br /> excavations did not contain detectable concentrations of TPH-as-gasoline, BTEX or <br /> oxygenates Total lead was detected in only one of the soil samples at a concentration of 5 1 <br /> mg/kg This lead concentration is probably indicative of background conditions <br /> Results of the soil stockpile sampling and analysis indicate that the canopy support over- <br /> excavation soil pile contains up to 220 mg/kg of TPH-as-gasoline and up to 10 mg/kg of <br /> xylenes Benzene, toluene, ethylbenzene and oxygenates were not detected in any of the soil <br /> samples collected from this stockpile Total lead was detected in only one of the soil samples <br /> at a concentration of 8 8 mg/kg The composite soil sample collected from the small south <br /> stockpile did not contain detectable concentrations of TPH-as-gasoline, BTEX, oxygenates or <br /> total lead <br />