SITE INFORMATION AND CORRESPONDENCE_FILE 1

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r San Joaquin County DIRECTOR P""'" Environmental Health De Donna Heran,REHS O Department C I' ASSISTANT DIRECTOR ). O a a 600 East Main Street Laurie Cotulla,RENS c Stockton, California 95202-3029 PROGRAM COORDINATORS • Carl Borgman,REHS cq' Website: www.S ov.or /ehd Mike Huggins,REHS, RDI Wb C i F o R� IJ Margaret 9 t_agorio,RENS Phone: (209)468-3420 Robert McClellon,REHS Fax: (209)464-0138 Jeff Carruesco,REHS,RDI February 8, 2008 Kasey Foley,REHS Mr. Thomas O'Neill PO Box 923 Stockton, CA 95201 Subject: Valley Motors Site Code: 1166 800 E. Main St RO#: 594 Stockton CA 95202 CUF#: 12540 The San Joaquin County Environmental Health Department (EHD) has reviewed Feasibility Study (Study) dated January 11, 2008, submitted by Upgradient Environmental Consultants (UEC) on January 28, 2008, for the above referenced site and has the following comments. On December 20, 2007, the EHD approved UECs requested extension for the submittal date of the Study with the condition that the document be submitted to the State Geotracker database by January 28, 2008. As of the date of this correspondence, the Study has not been submitted to Geotracker. The EHD received an electronic mail from UEC and the Study was attached in PDF format. This method of submittal does not meet the condition provided for the approval of the extended submittal date. You are not in compliance with EHD directives and you could become ineligible to receive reimbursement for corrective action costs from the State Water Resources Control Board Cleanup Fund. In the interest of ensuring that the site remedial action review proceed in a timely manner, the EHD has reviewed the Study and concurs that ground water extraction (GWE) treatment and discharge to the City of Stockton waste water system may be the most feasible and cost effective method. The EHD concurs with the recommendation in the Study that a work plan to conduct a GWE pilot test should be submitted. The work plan for installing the GWE test well is to be submitted to Geotracker so that the EHD may review the plan by March 31, 2008. The other remedial alternative evaluated in the Study was for in-well air stripping utilizing the ART well technology. The EHD has evaluated the ART process for other sites and has determined that the well construction details did not meet San Joaquin County Well Standards. Substantial modifications were needed before the EHD could approve the well for installation. In addition, the EHD requested that information be submitted to show that this method was successfully used to remediate contamination at a site with similar subsurface conditions and contaminants. Another remediation method was chosen and the information was not provided. LOP\800 E MAIN ST.doc