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L& M OPERABLE UNIT- FIRST QUARTER 2014 SITE STATUS, REMEDIAL SUMMARY, AND
<br /> GROUNDWATER MONITORING REPORT
<br /> Attachment 2
<br /> Page 7
<br /> MW-17, MW-19, MW-40, MW-43, MW-47, MW-48, MW-49, and MW-52. SPH levels
<br /> were monitored for four weeks following the initial extraction event.
<br /> in September 2006, SECOR, along with Entact Environmental Services,
<br /> commenced pipeline abandonment and removal activities at 525 West Weber
<br /> Avenue in the Waterfront Towers Parking facility in accordance with Stantec's
<br /> Pipeline Removal, Abandonment, Soil Excavation, On-Site Horizontal SVE Well
<br /> Installation, and Horizontal SVE Well Installation Beneath Delta View Apartments
<br /> Report and Work Plan for Pipeline Removal, Abandonment, and Soil Excavation
<br /> in Waterfront Towers Parking Lot dated February 10, 2005. A report entitled
<br /> Pipeline Removal, Abandonment, Soil Excavation, and Parking Lot
<br /> Reconstruction summarizing remedial activities and parking lot restoration at the
<br /> Waterfront Towers Parking facility was submitted on June 25, 2008.
<br /> On "May 31, 2007, optimization of the DPE/SVE system, in accordance with
<br /> SECOR's Work Plan for Additional DPE Feasibility Testing and Expanded Remedial
<br /> System Installation, dated January 4, 2006, was completed and permitted to
<br /> operate by the city of Stockton. A soil vapor extraction system start-up and dual
<br /> phase augmentation report was submitted on June 25, 2008.
<br /> On June 21, 2007, well MW-6 on the MOU was destroyed and abandoned on
<br /> behalf of the City of Stockton and under the supervision of Golden State
<br /> Environmental due to planned excavation and construction activities.
<br /> From July 28 through September 26, 2008, additional assessment activities were
<br /> conducted at the Site. Five B-zone groundwater monitoring wells (MW-56
<br /> through MW-60), seven C-zone groundwater monitoring wells (MW-61 through
<br /> MW-67), and seven D-zone groundwater monitoring wells (MW-68 through MW-
<br /> 74) were installed. Results were summarized in Stantec's Additional Deep
<br /> Groundwater Zone Assessment Report dated January 26, 2009.
<br /> In November 2008, Treadwell and Rollo (T&R) on behalf of the City of Stockton
<br /> abandoned monitoring wells MW-8, MW-10, MW-11, MW-39, MW-40, MW-41, and
<br /> MW-53 due to excavation activities on the UOU. These wells have yet to be
<br /> reinstalled at the site.
<br /> In January 2009, T&R, on behalf of the city of Stockton, concluded their
<br /> excavation activities on the Unocal Operable Unit adjacent to the L&M
<br /> OU. Treadwell and Rollo submitted their report of findings entitled Removal
<br /> Action Completion Report Unocal Operable Unit on Area 2A to the RWQCB-CVR
<br /> (�1 Stantec
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