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10/05/88 09!26 1&2095951 r• 004 <br /> ' a <br /> r Septembr. r 21 , 1988 i'ri,;•� :i <br /> Chevron U . S .A . <br /> sand would be placed in the annulus of each well. point. . The <br /> wells will extend to an equivalent depth of about 15 feet <br /> below the existing excavation botLom, Final design plans <br /> would bre submiLt,ed to your uffi.co for approval prior to the <br /> commencement of Phase TT construction. A condensate <br /> collection sYstem will, be collected in line with the syAtem <br /> to accomodate vapor-to- biquid. condensatiu" , <br /> PHASE tI <br /> A third. phase contamination reduction system would be <br /> developed for ground water conditions , once those condition <br /> have been more adequately defined . Current data docs not <br /> provide sufficient information to develop a preliminary <br /> design . However, the Phase I and Phase II systems would be <br /> compatible with virtually any ground water contamination <br /> reduction system, including volatile hydrocarbons vapor, <br /> emissions treatment methodologies . <br /> MgNITTORING <br /> A monitoring plan for the contiguous vapor removal <br /> sysLc,m would consist: of exhaust emissons monitoring , as well <br /> as periodic subsurface performance evaluation. The exhaust. 1 <br /> monitoring program would begin with the Phase I start-yap and <br /> would include air sL.ream sampling of exhaust with a portable <br /> gas chromatograph , such an the PhotovQ unit . The frequency <br /> of sampl. i ng' would most likely include hourly sampling for Lhe <br /> first day of operation during the adjustments period ; once- <br /> daily sampling for, the firs! week; then weekly- sampling for <br /> t,hs next month ; monthly sampling for the first quarter , then <br /> quarterly sampling thereafter . At the hegining of the Phase: <br /> II start-up, the hourly sampling for the first day and daily <br /> aamp.ling for the first: week would be repeated . Provisiunx for <br /> condensate visual monitoring will also be made on a periodic <br /> basis. <br /> Well points would be constructed with an access port to <br /> allow for monitoring of system effectiveness . A vapor probe <br /> with a perfoat.ed tip would be periodically advanced Lo t,h.e <br /> bottom of the battered wells to allow resident background <br /> vapor sampling . Thn performance sampling would only be <br /> conducted after the system had been shut down, and allowed to <br /> reach a representative equilibrium. <br /> AIR allAl j l y App PERMITTI. , <br /> The Sari Joaquin County Air Pollutant. Control, District <br /> ( SJCAPCD) was contacted for their requiremenLs for <br /> discharging gasoline volatiles to tho atmosphere . It was <br /> understood from our conversations with SJCAPCD that they <br /> will allow up to 5 lbs . per day of total petroleum <br />