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�r <br /> August S, 1991if9iS�`�� <br /> ARCO Station No. 6100, Tracy, California <br /> FIELD PROCEDURES <br /> Va nor-Well onstruciion <br /> The vapor-extraction wells will be constructed of ti' -id-jointed,glues, solvents willebe usedile <br /> n <br /> polyvinyl chloride (PVC) casing. No chemical cern. g -perforated casing <br /> well construction, Tic screened portion of the wells will consist of factory <br /> be <br /> with 0.020-inch-widedgslotdscasin casings. 3 sand will be placnterval between ed n tand ile annulfeet ar space Opposielow grade te the <br /> screened using slotted 8 <br /> screen to approximately 1 foot above the top of the slotted casing. A 2-foot bentonite plug <br /> will be placed above the sand pack, and a cement-bentonite slurry will be used to fill the <br /> remaining annulus to the surface. <br /> cted using clean The wells will be constlaride (PVC) casing?No chemicals, glues,sor solvents beck e <br /> Schedule ct polyvinyl cl <br /> o construction of the wells.cto �lerfo ated case screened ing with slots andvapor- <br /> extendextraction <br /> from approximately <br /> of a 10 foot section o rY P <br /> 1 foot above eh the <br /> depth <br /> where several inches was <br /> be first <br /> surface grade.Unperforated casing is set from <br /> the top of the <br /> The annular space of each well is packed with sorted sand from the o ah depth <br /> oniiof pelf 8 <br /> to approximately 1 foot above the top of the screen. A plug <br /> the <br /> approximately 2 feeaiplace <br /> lus is backfilled to the ground surface fw h a mixtrom ug <br /> sre of <br /> sand pack. Tie remning g annulus <br /> water, cement,and bentonite. The construction details of the individual wells are shown on <br /> ' the Logs of Borings. <br /> ns. I'lie boxes have <br /> The wellheads are secured in cast-aluminum utility boxes <br /> flush with he surrounding ground <br /> watertight seals and are set in concrete app <br /> en the box. <br /> surface i educe surges vandalismion. A reduces thelal wrench is possibility of accidental disturbance urbane 10 <br /> +r» This design Each <br /> w r lh well cage to further protect against <br /> the well. Each wellhead is also fitted with a locking g <br /> unauthorized disturbance of the well. <br /> �a <br /> 0619cear <br /> 30011-241 <br /> Fr <br />