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Ellet® <br /> 1 • <br /> Ms Margaret Lagono <br />' July 16, 2004 <br /> Page 4 <br /> soil caused by the microsparge bubbles Hydrocarbon concentrations in well NP-1 have <br /> remained below laboratory reporting limits during the test period with the exception of four <br /> sampling events The four detections of petroleum hydrocarbons in well NP-1 may be due to <br /> the desorption mechanism mentioned previously ENSR will continue to monitor well NP-1 to <br /> assess whether or not this is occurring <br />' Recommendations <br /> ENSR recommends that operation of the Ozone Pilot Test system be continued and <br />' 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 San Joaquin County Environmental Health Department letter dated <br /> December 30, 2003 <br />' Future Work <br /> ENSR will continue operation and maintenance of the treatment system in order to limit system <br /> down time The third quarter groundwater monitoring and sampling is scheduled for August <br /> 2004 <br /> Historical soil sample analytical data has been reviewed, a letter of findings regarding potential <br /> sources of 1,2-DCA and lead in soil beneath the site will be submitted during third quarter 2004 <br /> 1 <br /> J IProlectsl0694012859-357VinaAReportsQnd Qtr 04 QMR RSR12nd Qtr 04-QMR doc <br />' Over 30 Years of Excellence in Environmental Services <br />