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13 December 1995 <br /> AGE-NC Project No. 95-0109 <br /> Page 5 of 8 <br /> remediation progress and provide information for modifications to an existing system or treatment <br /> method. It does not appear that the soil vapor monitoring at the GLDM site fits this criteria; <br /> continued soil vapor monitoring will only add to the cost of the project without providing data critical <br /> for evaluation of remediation progress. Therefore, we recommend discontinuance of all soil vapor <br /> monitoring at the GLDM site. <br /> 3.5. REMEDIATION THVIE-LINE <br /> Although ground water remediation at the GLDM site has not met time-fines stated in the original <br /> FRP, soil remediation at the site has progressed significantly. Figures depicting concentrations of <br /> TPH and benzene at several depth intervals prior to remediation of the site and after initiation of <br /> remediation are included in Attachment B. In most areas, impacted soil has been reduced to very low <br /> concentrations. With the recommended addition of nutrients, impacted soil at the site should reach <br /> acceptable concentrations within the next 12 to 24 months(not including permitting delays). <br /> With the addition of ammonium nitrate (nitrogen source) and hydrogen peroxide(oxygen source), <br /> and the continued in-well aeration of MW-14, ground water samples should show an increase in <br /> microbial growth. With the increase in microbial growth, petroleum hydrocarbons concentrations <br /> should show an overall decrease at the site. [specific time; something about being delayed due to <br /> permitting]. <br /> 3.6. CONTINGENCY PLAN <br /> If the modifications to the ground water remediation program fail to show significant progress over <br /> a period of 12 months, then the original contingency plan will be implemented. The contingency plan <br /> includes pumping of impacted ground water and above-ground treatment and disposal. <br /> 4.0. PROCEDURES <br /> 4.1. INSTALLATION AND SAMPLING OF GROUND WATER MONITORING WELL <br /> The following procedures will be performed for installation and sampling of the monitoring well: <br /> 1. Notify the PHS/EHD 48 hours prior to the commencement of any work. <br /> 2. Drill one boring using a truck-mounted drill rig equipped with hollow-stem augers. The <br /> boring will be installed within the City of Lodi right-of-way approximately 90 feet south of <br /> MW-9 and advanced to a depth of approximately 73 feet. <br />