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t *C.LEAR�i1l.ATER <br /> y 'G'. R .O U ',P 1. N x�- v <br /> b"ecause of the potential for vacuum loss through the ba ckfilFrnaterials` ' <br />;. RESNA's-boring logs indicate that fill material extends 10-15.feet-bel <br /> owl <br />` ,s ground surface {bgs); and the wells are screened-from 20 to:50 ft bgs. There is <br /> rto surface 5ea1'{such'as pavement) at'�theaocation of'the former tank field, <br /> . . thereby significantly,increasing the chance of`short-eircuitin air flow'in-.this' - <br /> g�, <br /> jT <br /> y d i <br /> 'The attached Tables 1 and 2-summarize operational'data`-c'oilected at thee?_ <br /> subject'location. On-:March 22; 1995 wells VW I, W- <br /> V -2 'and:VW-3 were: { <br /> r connected'to the system at'the sequesi,of',the`San Joaquin PHS/EHD. On.that <br /> date; each tiWell.was lsolai6d-and tested individually fot.vacuum;"flow;-'"and.::`+ a <br /> FID vapor;concerttrations: This data; summarized below;.was included in the:. <br /> ost recent.Ouarterly Monitoring Report <br /> k ! �.,c .o •• 3.� n tr. - YF Er - i .\ x.r. l l d J a y <br /> '* Flow rates rangedrfrom 77,scfm_(VW-5) to 108 scfm (VW 3.) <. <br /> Vacuums,(inches of water) ranged from 19.(V-W-: and VW 4) to .41 <br /> ID Vapor concentrations ranged.from X40'ppMY {VW5'} to 0 (all other` <br /> 14 <br /> On-March 22 and'again on,May 24 the system was evaluated with all <br /> Wells running simultarieously:' The data,from.the test conducted=in May was <br /> riot included rn ourlast'report In-summa ` <br /> � <br /> V <br /> r Flow.rates xr nged,from ll scfm (VW-5) to 50 scfm {VW4 v►rith the <br /> r :.flow rates-. rom'VW-1, VW=2, and'VW-3 apprgximately20-40 scfm <br /> iX- <br /> F Vacuums ranged-from 2 5' to 5.5 'inches of water <br /> FID wapor',conceritrations ran ed from-40 my (VW= .S ,to 12 my ` <br /> `(VW-4) ~FID'measurements were 6-in the reniam' 'n yells <br /> F Totalsysterri':flow was.155 scfm .a5 stated above, the blower is-ratedfor 200 <br /> ' SCfrn• 4 4 F {_ <br /> On the:basis'of these measurements, we'believe feel that the individual-wells <br /> ` are:capable of Per forming..withiri the parameters estimated'during the pilot <br /> tests .However, the'current,sy'tein was designed.to extract vapors from 2 or 3 <br /> ;y wells at a .time As.the data-above indicate °vacuums and.flow`rates are ; <br /> somewhat`inargma"lized aeeach well when all_five wells'are online. <br /> We believe,;tha't'optunumoperation of this system will result,by.extracting '! <br /> r . vapors from VW-4 and,VW=5simultaneously and'then alternating-to - <br /> - tttt <br /> F simultaneous extraction from'VW V -2,,,arid VW 3. .This':segregated s <br /> pulsing of the systerri,will more closely match the purpose af:the system <br /> 5 4 <br /> - <br /> k` ' r <br />