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results show that the constituents of concern are below action levels, <br /> the site will proceed to closure <br /> If the monitoring well data show that residual levels of constituents <br /> are still present in the ground water at one or both of the sites, the <br /> concentration reduction achieved will be evaluated to assess whether <br /> continued extraction is likely to result in the desired cleanup within <br /> the required time period If the evaluation indicates that additional <br /> treatment is required, biological treatment of the ground water will be <br /> instituted If follow-on work is required, the additional work will be <br /> defined in cooperation with the EHD <br /> tThe extracted ground water will require sampling prior to disposal Per <br /> the Stockton Municipal Utilities Department (MUD) guidelines, the <br />' extracted water in the open-top tank will be analyzed for volatile and <br /> semivolatile organic constituents by EPA Methods 624 and 625, and <br /> BTEX compounds by EPA Method 602 The pH of the water will be <br /> measured in the field The well and tank ground water samples will be <br /> accompanied by a trip blank <br />' Ground Water Disppgal <br /> Once the water in the tanks has been analyzed, a letter will be sent to <br /> Stockton MUD requesting permission to discharge the water to the <br /> sanitary sewer The letter will include a description of the nature and <br /> proposed quantity of the discharge, the time period of discharge, and <br /> will include the analytical data Once approval to discharge has been <br /> obtained from Stockton MUD, the water will be pumped out of the <br />' open tank to the near-by sanitary sewer manhole The pump rate will <br /> be set sufficiently low to avoid overloading the sewer line capacity <br /> Site Closurg <br /> Once the aeration and ground water extraction programs have been <br /> successfully completed, the site can proceed to closure The available <br /> data will be analyzed to evaluate the cleanup achieved, and to define <br /> any remaining affected media The site closure report will detail the <br /> field activities conducted, and the results of the cleanup efforts <br />' Once the site closure report has been completed, it will be submitted to <br /> EHD with a request for site closure <br /> 5-9 <br /> I <br />