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Stantec <br /> L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2012 SITE STATUS, <br /> REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling <br /> February 1, 2013 <br /> slight increase has been observed. Stantec will continue to evaluate and perform trend analysis <br /> thorough additional periods of groundwater fluctuation before it is determined if the trend is <br /> certain. Graphs depicting arsenic trends in selected A-Zone wells (MW-9, 2AMW-12, MW-18, <br /> MW-20, MW-21, MW-22, MW-23, MW-25, MW-28, MW-31, MW-34, and MW-45) are included in <br /> Appendix H. <br /> 2.9 PURGE WATER STORAGE AND DISPOSAL <br /> Between October 15 and 17, 2012, approximately 800 gallons of purge water was transferred to <br /> 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 E. <br /> I:\Tidewater\TW Stockton(P2A)\QMRs\2012\4Q12-Ann ual\4Q12 and Annual QSSR QRSR QMR Stockton_FINAL.doc 2.19 <br />