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L & M OPERABLE UNIT- FIRST QUARTER 2012 SITE STATUS, REMEDIAL SUMMARY, <br />AND GROUNDWATER MONITORING REPORT <br />Groundwater Monitoring and Sampling <br />April 30, 2012 <br />I:\Tidewater\TW Stockton (P2A)\QMRs\2012\1Q12\1Q12 QSSR QRSR QMR Stockton_FINAL.doc 2.28 <br />2.9 PURGE WATER STORAGE AND DISPOSAL <br />Between January 17 and 20, 2012, approximately 1,000 gallons of purge water was transferred <br />to the on-site remediation system to be treated and discharged to the sanitary sewer under the <br />waste water discharge permit for West Weber Avenue and North Lincoln Street, Stockton, CA. <br />Field data sheets for calculating the estimated purge volume are included in Appendix D. <br />2.10 REQUESTED CHANGES TO MONITORING AND REPORTING PROGRAM <br />Based on review of historical and recent groundwater monitoring and sampling data, Stantec <br />recommended that sampling frequency be reduced for some of the up-gradient and outlying <br />wells for the Site and that some of the analysis currently being performed be eliminated from <br />select wells. The requested changes were submitted during the third quarter of 2006 and a <br />meeting to discuss these and an additional change was conducted with the RWQCB-CVR on <br />January 24, 2007. The RWQCB-CVR agreed to provide a revised MRP for the Site. On March <br />14, 2011, Stantec received notification from RWQCB-CVR that a revised MRP is currently being <br />drafted. RWQCB-CVR requested additional information be added to the draft MRP; thus, <br />Stantec provided a revised draft MRP request to the RWQCB-CVR on March 28, 2011. <br />Additional correspondence between Stantec and the RWQCB-CVR transpired during the first <br />quarter 2012 and Stantec provided final comments to the draft MRP on March 13, 2012. It is <br />our understanding that a new, final MRP is in process with the RWQCB-CVR and will soon be <br />implemented for the L&M OU.