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Mr Michael Infurna Project 0805-114 02 January 29, 1996 Page 5 Laboratory Methods and Results Borings B-28 and B-29 are located adjacent to existing borings from which soli samples were collected for laboratory analysis, therefore, soil samples from these two borings were not submitted for laboratory analysis Selected soil samples from borings B-26 and B-27 and the composite sample from the stockpile were analyzed for total purgeable petroleum hydrocarbons (equivalent to total petroleum hydrocarbons as gasoline [TPHG]) with benzene, toluene, ethylbenzene, and total xylene isomers distinction using Environmental Protection Agency (EPA) Methods 5030/8015 and 5030/8020, respectively In addition, the composite soil sample collected from the stockpiled soil was analyzed for total lead using EPA Method/7421, and for reactivity, corrosivity and igmtability The soil samples were analyzed at Sequoia Analytical in Sacramento, California (California Department of Health Services Hazardous Waste Testing Laboratory Certification 1624) Copies of the chain-of-custody records and Iaboratory analysis reports are presented in Appendix C Results of laboratory analyses of soil samples collected from the wells indicated that TPHG concentrations ranged from below Iaboratory detection hnuts to 7,700 parts per million (ppm), and benzene concentrations ranged from below laboratory detection hrrlits to 8 4 ppm Results of analyses are shown on Table 1. CONCLUSIONS Based on pilot tests, SVE and air sparging are two remedial alternatives that are both efficient and cost-effective to remediate the site The SVE system is currently extracting and treating hydrocarbon-laden vapors as designed The air sparge wells were connected to the air sparge system during the third quarter 1995 Based on quarterly data from groundwater and the remediation system, hydrocarbon concentrations are decreasing SACNN\PJM805V08051140 2ES-95Npas 1