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C=AI TIS �rRo <br /> FUGRO WEST, INC. <br /> 1050 Melody Lane,Suite 160 <br /> Roseville,California 95678 <br /> Tel: (916}782-2110 <br /> FAX: (916)786-7830 <br /> April 25, 1994 <br /> Ms. Mary Meays <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 445 N. San joaquin Street <br /> P.O. Box 388 <br /> Stockton, California 95201-0388 <br /> Subject: Former Shell Service Station (WIC No. 204-7524-1509) <br /> 141 N. EI Dorado Ave., Stockton, California <br /> Dear Ms. Meays: <br /> Fugro West, Inc. (Fugro) is providing this correspondence in response to the letter, dated <br /> February 25, 1994, from the San Joaquin County Public Health Services, Environmental <br /> Health Division (PHS/EHD), regarding the subject site. <br /> During quarterly groundwater monitoring conducted on February 15, 1994, it was noted <br /> by PHS/EHD staff that well RW-1 needed repair. The necessary repairs have since been <br /> made. The PHS/EHD letter also remarked that the remediation system "is not considered <br /> as a sufficient attempt to restore the groundwater quality beneath the site to background <br /> levels..." <br /> Shell Oil Company has authorized Fugro to modify both the existing soil and groundwater <br /> remediation systems. Monitoring well MW-3, which has consistently contained the <br /> highest hydrocarbon concentrations, will be plumbed into the vapor extraction system. <br /> In addition, Fugro proposes to install air bubblers (air sparging at low volume and <br /> pressure) in several of the wells. This will increase dissolved oxygen concentrations in <br /> the groundwater. The higher dissolved oxygen concentrations will stimulate microbial <br /> activity and accelerate hydrocarbon biodegradation in groundwater. Vapor extraction and <br /> groundwater recovery will continue. As you know, estimating the time to complete <br /> remediation of hydrocarbons in soil and groundwater is not possible. However, we will <br /> continue to evaluate remediation progress and performance in our quarterly monitoring <br /> reports. <br /> 9U7301 ULT U.S. operating companies in California, Louisiana, Missouri, and Texas <br /> International operating companies in Australia, Belgium, Brunei, Canada, Germany, Hong Kong, Indonesia, Japan, <br /> Malaysia, The Netherlands, Saudi Arabia, Singapore, United Kingdom, and United Arab Emirates. <br />