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L & M OPERABLE UNIT- FIRST QUARTER 2012 SITE STATUS, REMEDIAL SUMMARY, <br />AND GROUNDWATER MONITORING REPORT <br />Status of Remediation Activities <br />April 30, 2012 <br />I:\Tidewater\TW Stockton (P2A)\QMRs\2012\1Q12\1Q12 QSSR QRSR QMR Stockton_FINAL.doc 3.3 <br />3.3 SEPARATE PHASE HYDROCARBON REMOVAL <br />SPH removal activities are conducted to remove observed SPH from wells on and offsite. SPH <br />removal activities are conducted quarterly (at a minimum) for wells that repeatedly contain SPH <br />sheen or a measurable thickness of SPH. <br />The DPE Non-aqueous Extraction Technique (NET) free product removal system and periodic <br />extraction from monitoring wells removed approximately 6.4 gallons of SPH from groundwater <br />beneath the Site between October 13, 2011 and January 12, 2012. Approximately 1,777.2 <br />gallons of SPH have been removed from groundwater beneath the Site since May 10, 2004. <br />SPH removal data can be found in Tables 16 and 17, and field notes from the SPH removal <br />event can be found in Appendix H.