Laserfiche WebLink
Ms Margaret Lagorio S E C ® IR <br /> August 1, 2005 <br /> Page 6 <br /> REMEDIATION PERFORMANCE CRITICAL EVALUATION <br /> Based on the results of the second quarter 2005 data (both groundwater monitoring and <br /> remediation system operational data) ozone sparging continues to be effective in <br /> reducing petroleum hydrocarbon concentrations Dissolved MtBE and other <br /> hydrocarbon levels have declined since ozone sparge system startup in 2001 (as shown <br /> in Figures 2 and 3) <br /> WASTE DISPOSAL <br /> The volume of purged groundwater generated and disposed of during the quarterly <br /> groundwater monitoring event is documented in TRC's Quarterly Monitoring Report, <br /> April through June 2005 (Attachment 1) <br /> RECENT SUBMITTALSICORRESPONDENCE <br /> a <br /> Submitted <br /> k <br /> To San Joaquin County Public Health Services, Quarterly Status and Remediation <br /> Summary Report— Second Quarter 2005, dated April 28, 2005 <br /> THIS QUARTER ACTIVITIES (Second Quarter 2005) <br /> • 1 TRC performed quarterly groundwater monitoring and sampling <br /> 2 SECOR performed remedial system operations and maintenance <br /> NEXT QUARTER ACTIVITIES (Third Quarter 2005) <br /> 1 TRC to perform quarterly groundwater monitoring and sampling <br /> 2 SECOR to perform remedial system operations and maintenance <br /> 3 SECOR to resurvey MW-11 by hiring a licensed surveyor <br /> 4 SECOR to prepare and submit quarterly status and remediation summary report <br /> CONCLUSION <br /> Based on the results of the second quarter 2005, the existing ozone sparge well network <br /> appears to be successfully remediating hydrocarbons dissolved in the groundwater at <br /> the site SECOR will continue to operate and evaluate the effectiveness of the ozone <br /> sparge system during the third quarter 2005 <br /> LIMITATIONS <br /> This report presents our understanding of existing conditions at the subject site The <br /> conclusions contained herein are based on the analytical results, and professional <br /> judgment in accordance with current standards of professional practice, no other <br /> warranty is expressed or implied SECOR assumes no responsibility for exploratory <br /> borings or data reported by other consultants or contractors <br /> 6981 202005 QSSR doc SECOR Intemahona!Incorporated ` <br /> a <br /> �i <br />