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vapor sampling were summarized in SECOR’s report entitled Soil Vapor Well Installation and Soil Vapor Extraction Start-Up Report, dated November 30, 2005. From March 21 through March 23, 2006, additional assessment activities were conducted at the Site in accordance with the Work Plan submitted January 4, 2006 entitled Work Plan for Additional DPE Feasibility Testing and Expanded Remedial System Installation. Seven piezometers and one DPE well were advanced for the purpose of conducting radius-of-influence analysis on several existing DPE wells. Pilot testing on DPE wells was conducted between April 4 and April 26, 2006. A temporary above ground extraction line was installed on DPE-13 as part of these pilot testing activities. Results from the pilot testing were used to design and implement remedial system upgrades to better optimize contaminant mass removal from soil and groundwater beneath the L&M OU. Remedial system upgrade installation activities were completed during the second quarter 2007. Beginning on September 1, 2006 SPH is periodically extracted from a select group of L&M OU monitoring wells that have had consistent SPH thickness over recent quarters. Extraction is performed on groundwater wells MW-4, MW-10, MW-17, MW-19, MW-40, MW-43, MW-47, MW-48, MW-49, and MW-52. SPH levels were monitored for four weeks following the initial extraction event. In September 2006, SECOR, along with Entact Environmental Services, commenced pipeline abandonment and removal activities at 525 West Weber Avenue in the Waterfront Towers Parking facility in accordance with Stantec’s Pipeline Removal, Abandonment, Soil Excavation, On-Site Horizontal SVE Well Installation, and Horizontal SVE Well Installation Beneath Delta View Apartments Report and Work Plan for Pipeline Removal, Abandonment, and Soil Excavation in Waterfront Towers Parking Lot dated February 10, 2005. A report entitled Pipeline Removal, Abandonment, Soil Excavation, and Parking Lot Reconstruction summarizing remedial activities and parking lot restoration at the Waterfront Towers Parking facility was submitted on June 25, 2008. On May 31, 2007, optimization of the DPE/SVE system, in accordance with SECOR’s Work Plan for Additional DPE Feasibility Testing and Expanded Remedial System Installation,dated January 4, 2006, was completed and permitted to operate by the city of Stockton. A soil vapor extraction system start-up and dual phase augmentation report was submitted on June 25, 2008. On June 21, 2007, well MW-6 on the MOU was destroyed and abandoned on behalf of the City of Stockton and under the supervision of Golden State Environmental due to planned excavation and construction activities. From July 28 through September 26, 2008, additional assessment activities were conducted at the Site. Five B-zone groundwater monitoring wells (MW-56 through MW-60), seven C-zone groundwater monitoring wells (MW-61 through MW-67), and seven D–zone groundwater monitoring wells (MW-68 through MW-74) were installed. Results were summarized in Stantec’s Additional Deep Groundwater Zone Assessment Report dated January 26, 2009.