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a .K <br /> September 16, 1941 <br /> ARCO Service Station No. 2076, Lodi, California <br /> borings <br /> that hydrocarbons were not etected in the <br /> I oil samples <br /> submnd itted <br /> x�'lenetl cotyses e�rn(BTLX) <br /> B-2, B-4 and B-5; benne <br /> concentrations ranging from 0.08 to 0.052 parts per million(ppm)were defected in sample <br /> from borings B-1 and B-3. <br /> During a vapor-extraction test conducted in JUIpres sure data obtained duri ng y 1991, Nye evaluated whether vapor <br /> extraction feasible le vapor- <br /> distancesite. <br /> betweee t the veils,we onclud e that e traction o!f 40 cubic <br /> extraction test an <br /> tion l 1 produce <br /> feet per minute from a a or-efeetxtracBased upontteVET data RrESNA concludes that`vapor <br /> radius of approximately <br /> extraction is a feasible method of remediating soil at this site. The radius of influence <br /> estimated above can be further refined and the <br /> vestremeilrationstr re wime ctrrrinted e can ldditionlal <br /> estimated if additional subsurface environmentalinvestigations <br /> C <br /> details on. the VET are discussed in our report in App <br /> el Tanis Removal <br /> om tile <br /> ARCO's contractors are date for securing the rernovlle al will propriate be scheduled permits <br /> at ARCO's requestbyt D <br /> to remove the tanks. A <br /> contractor. During the tank removal a SJCPHS-EHD inspector, local fare department <br /> representative, and a RESNA staff geoingi,A will be present at tite site. <br /> in accordance with <br /> tate <br /> The contractor will first empty the tanks and e;ep bo of the ankssand the product andvent <br /> and local regulations. The asphalt and conthe <br /> s, and <br /> lines will be removed: l�erinsingt isctor perforlmedpla clean the inside ofe-rinse each tank, mtevtanl.s ltorremo e <br /> purge the vapors. Triple <br /> flammable material. Air is aumPenon-reactivethrough <br /> gas,usually nitrogen.or e tank to remove vapors <br /> arbon dioxlide,t tank. <br /> control <br /> lank chert will be filled <br /> the oxygen source to prevent fire or explosion; this is commonly achieved by placing dry ice <br /> in the tanks. <br /> Before the tanks are removed from the ground,the contractor will analyze the atmosphere <br /> sing a hand- <br /> inside the tanks fors indicator oxygen meter. When combustible vapors and the oxygen <br /> s of combustible vapors and oxygen content u <br /> sentaheld combustible gas indre <br /> t <br /> nt <br /> are at the safe levels,vl ofthe tanks.b The ends meter, the product pip and vent lines as nes wBbe <br /> will approve rem <br /> sealed. The contractor will remove the tanks and product lines and place them o flatbed <br /> trailers for transport to an appropriate facility for disposal. <br /> 30NO <br /> ■■■■®� <br />