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t _ <br /> IIINIUi_IEBIIE� <br /> Mr. Charles Leubner <br /> 10 October 1991 <br /> Pageor 8 <br /> tion sytem <br /> itted with <br /> ` arbon <br /> sheeting. The piping will be connected <br /> to a Yapplternative l8C If thesareaf where tl ecvapor <br /> canisters similar to that proposed <br /> the neary school, the air <br /> extraction will occur can be located b includond e0arental notifeetnfication ora public hearing. <br /> emissions permitting process should not P <br /> The estimated cost for Alternative 3 is $53,000. savings <br /> RECOMMENDATIONS <br /> lternative appears to be the leas <br /> Although the in-situ vapor extraction at costly,obtaining <br /> an air emissions permit would be more complicated than for the other alternatives. It <br /> requiring remediation is less that the estimated <br /> Is also possible that if the vol d not be me of sail <br /> s cost effective. Because of the relatively small <br /> quantity,this alternative wool <br /> volume of soil Alternative 3, excavation of contaminated soil and treatment by <br /> nn <br /> aboveground vapor extractioosel alteat the na `etbe auseoofwould not provide <br /> �the Yhigh cost of the vapor <br /> savings over the direct disp <br /> extraction equipment. If the material could be aerated in stages to limit the mass of <br /> (� emissions produced on a daily basis, the cost for tb!s alternative would be aernapproximately <br /> ei <br /> $18,000 less and would be less th -native (Alt <br /> an the In-situ(aeration ofethe soilnting atthe Corparatiotn Yard <br /> commended that this alternative <br /> It is re <br /> without vs�por recovery) be explored with the San Joaquin County i'ublic Environmental <br /> ed remedial action will be adequate to address <br /> Health Division to determine if the proposneeds <br /> ' the site conditions and if a workplan detailing this next phase of remedial activity <br /> to be prepared. <br /> 1 <br /> If you have any questions regarding the results of this investigation, please da not <br /> hesitate to call us. <br /> ~, Sincerely yours, <br /> HELMICK & LERNER INC. <br /> John S. Russell <br /> Project Geologist <br /> A'al <br /> Noel M. Lerner <br /> Project Manager <br /> - J CE .39,708 ... <br />