Laserfiche WebLink
w� <br /> E x <br /> Work Plan May 17, 1991 <br /> ARCO Seiviee Station No. 2130, Stockton, California AGS 30003-1W <br /> Vapor-Extraction Test <br /> This VET has two objectives: (1) to collect operational data to evaluate the efficiency <br /> and practicality of vapor extraction as a soil and ground-water remediation alternative <br /> and (2) to select the most appropriate off-gas treatment alternative, if the operational <br /> data suggest that vapor extraction is recommended. Applied GeoSystems will perform <br /> the VET in accordance with San Joaquin County Air Quality District guidelines. <br /> A portable vapor-extraction system will be transported to the site and operated as <br /> required to obtain vapor samples and vacuum pressure and flow rate information. <br /> Vapor samples will be collected into sample bags at the inlet and outlet of the vapor- <br /> extraction test system and submitted to a State-certified laboratory for analysis of TPHg <br /> and BTEX. Chain-of-Custody protocol will be followed throughout field and laboratory <br /> procedures. <br /> If site conditions are warranted., we may use vapor-extraction wells to remediate <br /> hydrocarbons excavated during the tank rem'oval'onsite. We understand from ARCO <br /> personnel that if gasoline hydrocarbons are detected in the soil during the upcoming tank <br /> removal, that another cavity would be excavated and the hydrocarboneous soil would be <br /> piaclad in that cavity because the new tanks will be installed in the existing tank cavity. <br /> Hydrocarbons in soil would then be removed by vapor extraction if the results from the <br /> proposed VET it;icate this method of remediation is feasible remediation Method at <br /> this site. A vapor-extraction system would be installed and managed until the <br /> hydrocarbon concentrations are reduced to Ievels acceptable by the SJPHS to remain in <br /> place. <br /> , <br /> 10 <br /> ,�Ipt'1 ed Ge®S step's <br />