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Work Plan <br /> May 17, 1991 <br /> ARCO Service Station No. 2168, Stockton, California AGS 31009-1 <br /> used to fill the remaining annulus to,the surface. A schematic,%�Xpor-recove 11 design <br /> is included in Appendix C. <br /> A traffic-rated cast-alunii nurn utility box wit a TVC apro will be placed over each <br /> wellhead and set in concrete flush with t surroundin concrete pad. This box has a <br /> watertight seal to Protect against curfa water infiltr tion and is opened with a special <br /> wrench. The design of the box discourages va. alism and reduces the possibility of <br /> accidental disturbance of the well. <br /> 770�� <br /> r/aabox wit a VC apro .0 <br /> '-th t s 'rr ndin con r( <br /> c i I <br /> eltr tio <br /> eur n a ncd <br /> w t <br /> courages va alism and rc <br /> Vrapg T.,Xft�;kQM_Ted <br /> This VET has two objectives: (1) to collect ope-ational data to evaluate the effici,!ncy auid <br /> practicality of vapor extraction as a soil and ground-water remediation alternative,and (2) <br /> to select the most appropriate off-gas treatment alternallive, if the operational data suggest <br /> that vapor extraction is recommended. Applied GeoSystems will perform tl%_:� VET in <br /> accordance with San Joaquin County Air Quality District guidelines. <br /> A portable vapor-extraction system will be transported to the site and operated as requirec( <br /> to obtain vapor samples and vacuum pressure and flow rate information. Vapor samples <br /> will be collected into sample bags at the inlet and outlet of the vapor-extraction test system <br /> and submitted to a State-certified laboratory for analysis of TPHg and BTEX Chain-of- <br /> Custody protocol will be followed throughout field and laboratory procedures. <br /> If site conditions are warranted, we may use vapor-extraction wells to remediate <br /> hydrocarbons excavated during the tam� removal onsite. We understand frorn ARCO <br /> personnel that if gasoline hydrocarbons are detected in the soil during the tank iemovd,the <br /> 10 <br /> �0�1 MR.9 M -0 M�� <br />