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Former Beacon Station No. 12474 March 18,2002 <br /> Stockton California Problem Assessment Report/Corrective Action Plan <br /> will contact Ultramar with the results of the public review process. At that time, Horizon or <br /> Ultramar will address any appropriate questions or comments, then proceed with scheduling <br /> of the proposed remedial systems installation work. The projected schedule for <br /> implementation of the proposed remedial action is later in 2002, depending on the public <br /> review and permit approval processes. <br /> 10.5 Proposed Verification Monitoring <br /> Quarterly groundwater monitoring would continue to be performed to evaluate plume <br /> concentration trends and stability, bio-attenuation.parameters, and verify the effectiveness of <br /> the remedial systems. Petroleum hydrocarbon constituent concentrations in groundwater <br /> should decrease because of the corrective actions and attain a level at which natural <br /> attenuation could proceed with measurable results. If the groundwater sampling indicates <br /> decreasing concentrations of petroleum hydrocarbons in the soil and groundwater over time, <br /> it is Horizon's opinion that the site would eventually qualify for Site Closure. <br /> s <br /> 11.0 DISTRIBUTION <br /> A copy of this investigation results report should be forwarded to: <br /> Mr. Gordon Boggs Mr. Michael Infurna Jr. <br /> Regional Water Quality Control Board San Joaquin County Public Health Services <br /> Central Valley Region Environmental Health Division <br /> 3443 Routier Road, Suite A 304 East Weber Avenue, Third Floor <br /> Sacramento, California 95827-3098 Stockton, California 95201-0388 <br /> 474PARCAP3-02.doc 23 <br /> Project No. 1474.23 HORIZON ENVIRONMENTAL INC. <br />