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A d van ced <br /> GeoEnvironmental , Inc . <br /> 1005 DEC 3 <br /> 23 December 2005 S A N J Fi U J;1 C UNT Y <br /> ENVIRONMENTAL <br /> AGE-NC Project No. 96-0235 HEALTH DEPARTMENT <br /> Mr. Jeff Wong <br /> SAN JOAQUIN COUNTY ENVIRONMENTAL HEALTH DEPARTMENT <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton, California 95201 <br /> Subject: Additional Monitoring Well Installation Work Plan <br /> WEST CLAY PROPERTIES <br /> 639 West Clay Street, Stockton, California <br /> Dear Mr. Wong: <br /> At the request of Mr. Dan Silva and Ms. Tina Mayhew of West Clay Properties, Advanced <br /> GeoEnvironmental,Inc.(AGE)has prepared this work plan for the installation of additional shallow <br /> monitoring wells in conjunction with the proposed ozone injection pilot study proposed at the former <br /> northern underground storage tank (UST) area at 639 West Clay Street, Stockton, California (the <br /> site).A location map is presented on Figure 1. A plan of the site is illustrated on Figure 2.The work <br /> plan addendum was prepared in response to the San Joaquin County Environmental Health <br /> Department(SCJEHD)comments and recommendations received verbally during an on-site meeting <br /> on 22 December 2005.The meeting was held to determine the approval of the ozone injection work <br /> plan and the preparation of a Corrective Action Plan for the southern UST release area. This work <br /> plan has been prepared in accordance with Central Valley Regional Water Quality Control Board <br /> guidelines for the investigation of UST sites. The following is a summary of dates related to the <br /> ozone injection proposal: <br /> • 04 January 2005 -Ozone Injection Pilot Study Work Plan was prepared and submitted to the EHD. <br /> 07 February 2005 the EHD directed West Clay Properties to perform an ozone bench scale study that <br /> meets the Regional Water Quality Control Board's requirements. 08 February- Ozone Injection- <br /> Bench Scale Pilot Study was prepared and submitted to the EHD and the Regional Water Quality <br /> Control Board. <br /> • 17 February 2005 - the EHD directs additional assessment of the southern UST area, with <br /> requirements to install wells or sample at a depth of 180 feet bsg. <br /> • Comments approving the Ozone Injection -Bench Scale Pilot Study from the Board were received <br /> by electronic mail on 24 February 2005. 28 February 2005 -the EHD directs compliance with the <br /> Board's requirements. <br /> • 07 March 2005-the EHD issued a permit for soil sample collection for the Ozone Injection-Bench <br /> Scale Pilot Study. <br /> 837 Shaw Road, Stockton, California 95215 <br /> Telephone(209)467-1006 Fax (209)467-1118 <br />