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GROUND ZERO ANALYSLS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320-1927 <br /> Telephone: (209) 838-9888 <br /> Facsimile: (209) 838-9883 <br /> May 14, 1999 <br /> Mr. Ron Rowe <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton, CA 95202 <br /> Subject: Knowles/Roek Property, 102 South Wilson Way, Stockton, CA <br /> Recommendation for Continued Soil Vapor Extraction <br /> Dear Mr. Rowe: <br /> The UST Fund has asked for a directive from San Joaquin County PHS/EHD before they will pre- <br /> approve anticipated costs for continued operation of the soil vapor extraction system (SVE) at the subject <br /> property. <br /> In view of the significant effect the SVE system continues to have on soil contamination at the property, <br /> we recommend continued operation of the system. Through the end of the first quarter of this year the <br /> SVE system had removed approximately 11,500 pounds of gasoline hydrocarbons from vadose soil <br /> beneath the former USTs. The most recent mass removal rate was approximately 50 pounds per week. <br /> Our request for pre-approval from the UST Fund is for an additional six months of SVE operation. The <br /> system will be evaluated frequently for effectiveness, particularly in light of the rising groundwater <br /> situation. <br /> Please comment on our recommendation as soon as practicable. If you have any questions feel free to <br /> contact me anytime. <br /> Respectfully, <br /> Ground Zer^o Analysis, IWc. <br /> Gregory P. Stahl, RG 5023 <br /> CA Certified Hydrogeologist No. 264 <br /> cc: Mr. Carl Knowles <br /> Mr. Pat Riddle, Esq. <br />