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ENVIRONMENTAL HEALTH DIVISIOP • <br /> 304 E.Weber Ave.Third Floor <br /> P. O. Box 388, Stoc on CA 95201-0388 <br /> Approved ,0 <br /> Denied ❑ <br /> W lConditions SF>< Pwya <br /> Datteyy Ip. y�yLlOi <br /> A' pYpt�r/J Cn IWLIG3/ ` lGROUND ZERO ANALYSIS, INC. <br /> f�"1"rP 'II�E 1714 Main Street <br /> SU � St rfi• Escalon,Califo nia 95320./927 <br /> Iri Telephone:(209)838-9888 . <br /> Facsimile:(209)838-9883 <br /> October 19, 1998 `f <br /> tl°�✓' I?i✓rt`'�n(� T Mr. Ron Rowe <br /> San Joaquin County Public Health Services <br /> 11 ��f G1i11 Vri IvkT� Environmental Health Division <br /> 304 East Weber Avenue,3rd Floor <br /> OttY,aatpp lq Stockton,CA 95202 <br /> ,--gt 4t,, SUE Ac(INrTy Subject: Knowles/Roek Property, 102 South Wilson Way, Stockton,CA <br /> ,�KL 1/ ii m 6mwai <br /> ,,,,s,/pe Recommendation for Continued Soil Vapor Extraction <br /> I lw/�Jr -ToDear Mr.Rowe: <br /> st t. <br /> C'IWnIIG <br /> EN tnIu51� As we discussed today,the UST Fund has asked for a directive from San Joaquin County PHS/EHD <br /> D �,� ��I�IIY L• before they will pre-approve anticipated costs for continued operation of the soil vapor extraction system <br /> tlfuwq.0(, g. *5 az the subject property. <br /> 96ra uti IIVV * sVs*i if In view of the significant effect the SVE system continues m have on soil contamination at the property, <br /> '' \\ we recommend continued operation of the system. Through the end of the third quarter of this year the <br /> TV rl Jljr f(W SVE system had removed approximately 9,500 pounds of gasoline hydrocarbons from vadose soil beneath <br /> the former USTs. The most recent mass removal rate was approximately 245 pounds per week. The <br /> Pot <br /> �`L system is operating,and we hope that downtime will be minimal hereafter,having repaired a faulty logic <br /> AAl circuit in the controller. <br /> Our request for pre-approval from the UST Fund is for an additional six months of SVE operation. <br /> Obviously,the system will be evaluated frequently for effectiveness,particularly in light of the rising <br /> groundwater situation. <br /> 3 /,e-L Please comment on our recommendation as soon az practicable. If you have any questions feel free m <br /> V 7 /n� D1 contact me anytime. <br /> U I �lgOrblf� Respectfully, <br /> p.�� t -I-'b COMMA? Ground Zero Analysis,Inc. "�— <br /> MVftll&T/'"i ofW dA'Dl`^W Gregory P.Stahl, RG 5023 ���A�� <br /> If f fltvv 1(/Jri r/�l.'� w/ axYG 6vfi� CA Certified Hydrogeologist No.264 <br /> �/��A cc: Mr. Carl Knowles <br /> Atv rI V"l Sj?j , Mr. Pat Riddle,Esq. <br /> fio r�tim�ru� tb D�fiM <br /> Va'�IwA ilmo r, �'rs�►�r�m� �G <br />