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L & M OPERABLE UNIT-THIRD QUARTER 2014 SITE STATUS, REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT Appendix B Page 8 on August 5, 2009. A groundwater collection trench, extending north-south, was left in the substrata approximately 15 feet bgs and along the eastern boundary of the excavation which paralleled the major pipeline removed during the investigation. In March 2009, Wallace Kuhl Associates (WKA), on behalf of the city of Stockton, concluded excavation, installation of exploratory borings, and UST removal activities on the property adjacent to the Waterfront Towers Parking Facility to the north and west. Wallace Kuhl and Associates submitted their report of findings entitled Stockton Promenade Underground Storage Tank Removal Report-Former North Edison Street to the RWQCB-CVR on June 8, 2009. In early 2010, T&R, on behalf of the city of Stockton, abandoned Morton Operable Unit wells MW-06R and 2BMW-1 due to the development of the DMV on the Morton-Alco Operable Unit southeast of the L&M OU. The DMV was completed and has been in operation since November 17, 2010. On February 22, 2010 Stantec submitted a Response to Discussion of Unocal's Harrison Street Pipelines During the December 2009 Meeting at the Regional Water Quality Control Board's Rancho Cordova, CA Office. During T&R subsurface investigation and excavation on the UOU a historical petroleum pipeline was uncovered and discussion on responsible parties and cost allocation for cleanup began between CEMC, Phillips 66, and the City of Stockton RDA. While the L&M Group and the RDA have differences concerning this issue, the L&M Group has asked the RWQCB-CVR to assist in mediating between the parties to reach an appropriate allocation of responsibility relating to groundwater issues in the vicinity of the L&M OU and UOU. On March 4, 2011 , Stantec submitted the Report of Findings for the Waterfront Towers Separate Phase Hydrocarbon Investigation and Unocal Extraction Well Pilot Study. The objective of the investigation was to provide additional data points for further delineation of the vertical and lateral extent of dissolved petroleum hydrocarbons and observed SPH plumes beneath the Waterfront Towers parking facilities; petroleum pipelines potentially associated with historic activities at the L&M OU and the Unocal Operable Unit (UOU) were previously removed from this location. In addition, the report presented a discussion of an aquifer test and system feasibility study conducted at the UOU. The objective of this study was to determine the quantity and quality of groundwater at the UOU, specifically within the previously installed collection trench at the site, to further evaluate the feasibility of remedial technologies currently applied at the L&M 4 5ta ntec