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Ell�yt® <br /> 16 Ms Margaret Lagono <br /> February 5, 2004 <br /> Page 4 <br /> ' exception of four sampling events The four detections of petroleum hydrocarbons In well NP-1 <br /> may be due to the desorption mechanism mentioned previously ENSR will continue to monitor <br /> well NP-1 to assess whether or not this is occurring <br /> Recommendations <br /> ENSR recommends that operation of the Ozone Pilot Test system be continued and further <br /> 1 groundwater sampling be performed to evaluate the system's effectiveness Additionally, ENSR <br /> recommends the continuation of the groundwater monitoring and sampling program in <br /> accordance with SJCEHD letter dated December 30, 2003 <br /> Future Work <br /> 1 ENSR will continue to troubleshoot the treatment system in order to limit system down time <br /> The first quarter groundwater monitoring and sampling is scheduled for February 2004 <br /> Historical soil sample analytical data will be reviewed to assess potential sources of 1,2-DCA in <br /> soil beneath the site If required, a work plan will be prepared to assess the site as a possible <br /> source of 1,2-DCA during second quarter 2004 <br /> Remarks/Signatures <br /> The interpretations in this report represent our professional opinions and are based, in part, on <br /> the information supplied by the client These opinions are based on currently available <br /> information and are arrived at in accordance with currently accepted hydrogeologic and <br /> engineering practices at this time and location Other than this, no warranty is implied or <br /> Intended <br /> J\Projects\o69401357-2859\Final\Reports\4th Qtr 2003-QMR-RSR doc <br />' 35 Years of Excellence rn Environmental Services <br />