Laserfiche WebLink
April 7 1992 <br /> ARCO Service Station No 760, Lodi, California <br /> VAPOR-EXTRACTIONTEST <br /> On June 14, 1991,RESNA conducted a vapor-extraction test (VET) at the site to assess the <br /> feasibility of using vapor extraction to remediate hydrocarbons-bearing soil beneath the site <br /> A copy our September 12, 1991 VET letter report is included in Appendix C <br />` Results of the Vapor-Extraction Test <br /> The results of laboratory analyses of the vapor samples indicated TPHg concentrations from <br /> well VW-3 were below the detection limit of 5 0 milligrams per cubic meter (mg/m3), 2,900 <br /> mg/m3 from well VW-2, and 980 mg/m3 from well VW-1 <br /> Utilizing the vacuum and distance measurements obtained during the VET,�an effective <br /> radius of influence of 22-feet-was estimated for the site (Plate 4) Vapor-extraction wells <br /> to be used for remediation at the site should be installed at distances less than 44 feet apart <br /> Based upon the VET data, RESNA concludes that vapor extraction is a feasible method of <br /> remediating soil at this site Additional Vapor-extraction wells are warranted before <br /> proceeding with designing a vapor-extraction system <br /> REMOVAL OF UNDERGROUND-STORAGE TANKS AND PRODUCT LINES <br /> During June 1991, three underground gasoline-storage tanks, associated underground <br /> product-delivery lines, and two waste�oiLtanks were removed from the site Copses of the <br /> 1 Chain of Custody Records and laboratory reports are included in Appendix D <br />' i <br /> 38048-5 6 <br />