ARCHIVED REPORTS_QUARTERLY GROUNDWATER MONITORING REPORT 1ST QUARTER 2016

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QUARTERLY GROUNDWATER MONITORING REPORT — FIRST QUARTER 2016 L&M Operable Unit—West Weber Avenue and North Lincoln Street, Stockton, CA • Appendix B Page 8 MW-53 due to excavation activities on the UOU. These wells have yet to be reinstalled at the site. In January 2009, T&R, on behalf of the city of Stockton, concluded their excavation activities on the Unocal Operable Unit adjacent to the L&M OU. Treadwell and Rollo submitted their report of findings entitled Removal Action Completion Report Unocal Operable Unit on Area 2A to the RWQCB-CVR 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 ® Stantec