Laserfiche WebLink
' 28 May 1991 <br /> GeoAudit CV 4304 . 1. 1 - Work Plan for Vacuum Extraction <br /> Page 4 of 10 <br /> 1 <br /> (GTT Project no. 202/799-5005. 01, report dated 21 November 1988) . <br /> The recovery of free-floating product, using a bailer, was <br /> performed by a representative of Genova Bakery. Due to severe <br /> drought conditions, the wells at the subject sites became dry. It <br /> ' is our understanding that no additional assessment and/or <br /> mitigation attempts have been conducted since then. <br /> on 21 March 1991, a work plan was submitted by GeoAudit to the <br /> ' SJEHD to install a vacuum extraction well to a depth of <br /> approximately 70 feet. The well is designed to facilitate vapor <br /> removal from practically the entire well depth. An approval to <br /> install the extraction well in the location of the former tank has <br /> been granted by the SJEHD. <br /> 1. 5. ASSUMPTIONS <br /> Typically, the lateral extent of hydrocarbon contamination plumes <br /> from a single point source in a soil type, such as that of the <br /> subject site, does not exceed 25 feet in diameter. A limited soil- <br /> gas survey will be conducted to estimate the lateral extent of the <br /> ' impacted area (see Section 9 . 4) . The current depth to ground water <br /> is assumed to be 65 feet, which concurrently represents the maximum <br /> vertical extent of the plume. Approximately 1., 200 cubic yards of <br /> contaminated soil exists at the site. <br /> Based upon the existing analytical results, the average level of <br /> the hydrocarbon contaminants is calculated as follows: <br /> ' Total Petroleum Hydrocarbons (TPH) 5, 780 mg/kg <br /> Benzene 168 mg/kg <br /> Toluene 615 mg/kg <br /> Ethylbenzene 139 mg/kg <br /> Total Xylenes 779 mg/kg <br /> Based upon total volume of contaminated soil and the average <br /> contamination level, approximately 18, 500 lbs or 3 , 000 gallons of <br />' gasoline total gasoline were released. <br /> Please note that the figures used here are liberally calculated. <br /> The actual volume of contaminated soils, the average level of <br /> contamination and subsequently the total volume of product released <br /> are likely to be less than presented here. <br />