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10/04/88 15:32 %220941;51 11004 <br /> Page 3 <br /> September 21 , 1988 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 17 feet <br /> below the existing excavation bottom. Final design plans <br /> would be submitted to Your Office cfor approval prior to s hee <br /> commencement of Phase II conzt,ruction. A <br /> collection system will be collected in line with the system <br /> to accomodate vapor-to-liquid condensation. <br /> P �t� ASE ill <br /> A third phase Q MiDat ion redygtimn—amlag would be <br /> developed for ground water conditions , once those condition <br /> have been more adequately defined. Current data does 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 a <br /> omissions treatment methodologies . <br /> MONITORING <br /> A moniCoring plan for the contiguous vapor- removal <br /> system would Consist of exhaust emissons monitoring , as well <br /> as periodic subsurface performance evaluations . The exhaust <br /> monitoring program would begin with the Phase I start-up and <br /> would i.naLude air stream sampling of exhaust with a portable <br /> gas chromatograph, such as the PhotoVac unit , The frequency <br /> of sampling would most likely include hourly Sampling for the <br /> first day of operation during the adjustments period ; once- <br /> daily sampling for the first week; then weekly sampling for <br /> the next month; monthly sampling for the first quarter , then <br /> quarterly sampling thereafter , AL the begining of the phase <br /> IT start-up , the hourly sampling for the first day and daily <br /> ,ampling for the first we=ek would be reheated. Provisions for <br /> cone onsate visual- monitoring will also be made on a periodic <br /> basis . <br /> Well points would be constructed with an accesR port to <br /> allow for monitoring of system effectiveness . A vapor probe <br /> with a. perfoated tip would be periodically advanced to the <br /> bottom of: the bat,Lered wells to allow resident background <br /> vapor sampling . The performance sampling would only be <br /> conducted after fhe system had been shut dawn , and allowed to <br /> reach a ropresentati-ve equilibrium. <br /> ATR QUALITY &NND PERMIT ING <br /> The Sa.n. Joaquin County- Air Pollutant Control District <br /> (SJCAPCD ) was contacted Or their requirements for <br /> discharging gasoline volatiles to the atmosphere . It; was <br /> understood from our conversations with SJCAPCD that they <br /> will allow up to 5 l.bs . per day of total petroleum <br />