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TEL No . Jail 27 ,95 8:51 No .001 P .02 <br /> 01-�5r1995 06-44RM FR(\/ To 19162553015 P.92 <br /> i �J <br /> I <br /> JOHN JOHNSON DRAM <br /> I <br /> THE CUSTOMER COMPANY I <br /> P O BOX am i <br /> BENICIA CA 94510 j <br /> RE: 15 LAST GRANT LINE ROAD � SITE CODE: 1404 <br /> TRACY CA I = <br /> San idaquin Couretey t?UbIIC Health Services, Environmental Health OvIslon(PHSIEHQ)hes ctimpleted <br /> the review of trim"Rerindial Action worst Plan Additional Infomnationl tetter dated Dewmt&r 1.6. 1"4, <br /> suti nilted by Trans Tech Consurhants, and has the following comments for your oonsideration. <br /> To eppnnpriately characterize soli contamination in eras: not already invustigatod rrt this site, aufl-rr snt <br /> discrete Son Samples must tsar submitted to a state certTied lebora for brielysia_ Headspace G <br /> sr-Artis data can tae used in "unction With the data obtained from the laboratory to"Ott in the <br /> spa nsr. Howcut*r, use of the hoadspace analysis data must bo just ffed by the analytical data from <br /> the laboratory.. Assumptions on Ute full distribution and conoentratiarl of contaminants in the <br /> subsurface at the site Should not be based on heaospero date alone! Q' <br /> j <br /> Tho tsiommnsdtbon pspposal was presented to the PHS/EHD tech n' 'i staff at a recent meeltim. Staff <br /> concluded that o srrt*Al scale pilot study should be conducted at thlelte. The olsjacUve of the pilot <br /> r N f cc✓✓ study would be to gager physical date to Indicate that this type of ow0ach is Uppmpriate for use at b <br /> u'= this site on a l2wer adate_ <br /> Tits distxaSSi� in the letter addendum discusses the use of monitors vapors in the wells as an 4 <br /> 5 1 indicator of.prngrass Of bioremediation and that stable, low levels of iydrooti bons would Indic to �p <br /> tsaaemediatbn to be camplsts. Any dntcxtion on an organic vapor mer mould;ndioat© remediation at [, <br /> i the site is not yet compiote. As already mentioned Ina July 18,1994 letter from PHStEND to you,the A% <br /> Initial cieanup,goal forthia site must be the background levels ftt istcd before the release ocourred. <br /> As petroleum hydruwiWrisS do not naturally occur in the subsurface t this site, background levels are <br /> G nondetecabla 12vets using the most stringent detection tinsi2s availabi� Therefore, abating the levels of <br /> contamination gat thls site to any other navel than those mentioned ate would require additional <br /> u u remedial action an&cW a aomproh©nslve feasibOlty versus hast benefit Comparison For justlt'icstlon for r v� <br /> ka no furOser action. Aw <br /> G Asp .xaI parmit will have to be issued for the installation of the tomfbrary vapor motrltoring points,as t� _ <br /> the oor>atrudUon of these yells are a variance of San Joaquin County]V&ll Standards. In addtlbn, <br /> t• these rmlls must be Constructed to have a seating cap fitted witha 'mpling port which e�adcrtds Into 9` <br /> ( r the wetL A small pump can be used to obtain representative air Sa�t2S from the well, This <br /> construction will pmvide a more accurate representation of actual su rfave air conditions. <br /> J <br /> l7 t, <br /> In adcl tK n to monitoriAg vapors from the wells for biorernedial progr+s,#VD follo+afig monitoring <br /> paremetere will be row uired: <br /> N s ' ya Initialround levels for carbon dioxide, dissolved oxypsr�. and baMris tri groun <br /> tadwate <br /> r in L. t'�lo <br /> a weekly Masts, monitor air In test walls for gasoline va <br /> r h�'% 9 p carbon di*xida, and oxygen. <br /> ys4/aR - t r� Init;aiy,_monjl'r•po thane to stow no methane producing acterta are toeing applied. a( <br /> V t <br /> d` S, `,a Cart a weelc�,monitor groundwater in the test area for total petroleum hydrocarbons as <br /> cv{ a 9 :fin , toluene, ethylbenzene, xylene, the toter)number and Species of bccteris3, <br /> and for <br /> 1I <br /> 148•ti.C��cauWc-o4ryl.� ,v�w--wv,�` <br /> OA <br /> � <br />