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r i <br /> VALON <br /> ENVIRONMENTAL ; ri 20 CORPORATE PLAZA • NEWPORT BEACH,CALIFORNIA 92660 <br /> c o N s v L <br /> TANTS TEL:(949)644-2690 • FAx:(949)644-2691 <br /> 1 + °.t 12: 0 I <br /> September 14, 1999 <br /> Mr. Michael Infurna <br /> San Joaquin County Environmental Health Services <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton, California 95201-0388 <br /> Subject: Work Plan Monitoring Well Abandonment <br /> and Closure at 222 North EI Dorado Street <br /> Stockton, California 95202 <br /> Dear Mr. Infurna: <br /> At the request of the Central Valley Regional Water Quality Control Board (CVRWQCB), <br /> Avalon Environmental Consultants (Avalon) is presenting this work plan to abandon three <br /> existing monitoring wells at the above address. There are four wells total on the property, but <br /> one of the wells will be purchased by Arco Refining and Marketing Company (ARCO) for use <br /> in defining an offsite contamination problem. <br /> BACKGROUND <br /> The subject property consists of a two story structure which was a former State Savings and <br /> Loan building. Prior to construction of the State Savings and Loan building in 1961, the <br /> subject property was used as an automotive repair facility dating back to at least 1917. The <br /> site has been the focus of several environmental investigations from approximately 1991 when <br /> Clayton Environmental Consultants installed a groundwater monitoring well on the subject <br /> property until August of 1999, when the Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) requested that Washington Mutual Branch destroy the existing groundwater <br /> wells as a condition for a "No Further Action" status at the site. <br /> SCOPE OF SERVICES <br /> As requested by the client, Avalon will abandon three of the four existing onsite groundwater <br /> monitoring wells. Avalon will also coordinate for the remaining monitoring well to be deeded <br /> over to Arco for a groundwater investigation they are conducting up gradient to the subject <br /> property. In addition, Avalon will dispose of waste generated in connection with the <br /> groundwater wel I abandonment, composite sampling of the waste generated, and coordination <br /> with the regulatory agencies involved, which are the San Joaquin County Environmental <br /> Health Services (SJCEHS), and the CVRWQCB. <br /> Permitting. <br /> Prior to abandonment, permits will be obtained by the SJCEHD. A work plan outlining the <br /> well abandonment procedures will be required by the SJCEHD. <br />