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fEAnWA{TE, <br /> a May,•24, 1995 <br /> Ms."Linda A Turkatte; Senior`R.E.H.S. t Y . <br /> Sari Joaquin;County"Public Health Services ' <br /> Environmental Health:Department' <br /> P. O Box 388' "­ <br /> Stockton .CA.=95201=0388 <br /> r y MAY 2 5 1995 <br /> Re: Ekholrn Property, 1702 jackson-Street, Escalon „;.. . <br /> w fAL HEAL11 i <br /> ENv bNMEN <br /> - PERMIT l SERVICES, <br /> t Dear Ms. Turkatte, ti y ,. <br /> c a l _ - ro r, r •tic .- ., . :. <br /> In accordance with lel '6f May 14, enclosed please find in#ormationrpertaining <br /> my . <br /> to the proposed Fneasuremerit of biogenic gasses at the"referenced location... As you <br /> F4 .: 1 ' <br /> Willi'find:' the.`protocol. is geared towards the rneasurement of-02 uptake.and: CO2 <br /> F generation .under natural aftd,hypet-aerated conditions;' and the calculation;of the <br /> b tion.-rate required"to-'enable the most;effective rate.of.biodegredation. The <br /> oxygenaF <br /> methods described .in,this,proiocol attachment are also suitable for the collection of <br /> data that will assist in,'th ' evaluation of the effectiveness' ' f the operating soil vapor ,t <br /> extraction system. <br /> The primary /objective.ofthis test is the collection of.data that'may'be used, as a tool <br /> ti . <br /> r : for .determining"when the vapor, extraction process may: be considered complete. It <br /> is 'anticipated. that this will'":occur when 02'uptakee;and, CO2' genet "ti"n the <br /> contarninated 'zono <br /> e`is"e ual t . that of-the backgroundf wells,.(those wells <br /> formerly q <br /> "outside,of the.areas of identified contamination). i The 'data collected during this test <br /> will eziable the..calculationof the fraction-of'hydrocarbon. removal that is attributable. ; <br /> r <br /> to:biodegredation, and the fraction.that is"associated with physical extraction. If it is . <br /> dernonstrated ,during this test,that. biological'.breakdown of',hyd-rocarbons in the <br /> subsurface ;`isl:'o.eciirring, `therm this propo ed . episode:,,,. f` .meastirernent` is. `s <br /> 4 recoinineneied to be Athe_first'of-several that will' take place over:the remainder of the <br /> project: <br /> The existing vapor extract 6i -.'system will be turned off several day&before the test is. <br /> to take.place in order to allow for subsur€ace.vapor equilibration and the subsequent <br /> 1- collection of. informatioin representative of non-extraction conditions. The test will <br /> l -" <br /> t thembe'conducted in accordance with the attached protocols.' It is anticipated that <br /> the, blower'"currently on site will be'used;to 'purge`the, wells of air volumes during <br /> the test.'' A:quarterly groundwater 'saixipling event will-be conducted following the <br /> comp letion of the test. ,Y <br /> 1725 Atlaiitic'Avenue!Suite.102+ 'Alameda-•Califorrua •94501.* (510)3377F30+•Fac(510)52. 0984 <br />