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<br /> During the first quarter 2005, six horizontal SVE wells were installed beneath five apartment ':c
<br /> buildings within the Delta View Apartment complex. A final report documenting the pipeline
<br /> abandonment, soil excavation, and horizontal SVE well installations was submitted to the '
<br /> CRWQCB and the Department of Toxic Substance Control (DTSC). This report is entitled tit
<br /> Pipeline Removal, Abandonment, Soil Excavation, On-Site Horizontal SVE Well Installation, and
<br /> Horizontal SVE Well Installation Beneath Delta View Apartments Report and Work Plan for
<br /> Pipeline Removal, Abandonment, and Soil Excavation in Waterfront Towers Parking Lot and
<br /> dated February 10, 2005, i
<br /> From March 21 through April 10, 2005, additional assessment activities were conducted at the
<br /> Site. Seven B-zone groundwater monitoring wells (MW-47 through MW-53), one groundwater <'
<br /> monitoring well intended to be a C-zone well (MW-54), and one groundwater monitoring well `#
<br /> intended to be a D-zone well (MW-55) were installed, and three Geoprobe soil borings (GP-1
<br /> through GP-3) were advanced. Results are summarized in SECOR's report entitled Additional ;Y
<br /> Deep Groundwater Zone Assessment Report, dated May 25, 2005. a x
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<br /> From July 13 through July 15, 2005, 16 soil vapor points were installed to monitor soil gas
<br /> concentrations over time and determine radius of influence of the previously installed SVE
<br /> system. On July 19 and 20, 2005 baseline soil vapor samples were collected from 12 of the 16
<br /> vapor points. The SVE system was initiated on August 18, 2005 for select wells. The completef
<br /> scope of work and results of the soil vapor well installations, SVE start-up, and soil vapor )
<br /> sampling were summarized in SECOR's report entitled Soil Vapor Well Installation and Soil
<br /> Vapor Extraction Start-Up Report, dated November 30, 2005. ¢
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<br /> From March 21 through March 23, 2006, initial additional assessment activities were conducted
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<br /> at the Site in accordance with the Work Plan submitted January 4, 2006 entitled Work Plan for
<br /> Additional DPE Feasibility Testing and Expanded Remedial System Installation. Seven a?
<br /> piezometers and one DPE well were advanced for the purpose of conducting radius-of-influence x''(
<br /> analysis on several existing DPE wells. �r
<br /> Pilot testing on DPE wells was conducted between April 4 and April 26, 2006. A temporary
<br /> above ground extraction line was installed on DPE-13 as part of these pilot testing activities.
<br /> Results from the pilot testing were used to design and implement remedial system upgrades to =`w'
<br /> better optimize contaminant mass removal from soil and groundwater beneath the L&M OU.
<br /> Remedial system upgrade installation activities were completed during the second quarter 2007.
<br /> Beginning on September 1, 2006 separate phase hydrocarbons (SPH) is periodically extracted
<br /> from a select group of L & M OU monitoring wells the have had consistent SPH thickness over
<br /> recent quarters. Extraction is performed on groundwater wells MW-4, MW-10, MW-17, MW-19,
<br /> MW-40, MW-43, MW-47, MW-48, MW-49, and MW-52. SPH levels were monitored for four
<br /> weeks following the initial extraction event.
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<br /> In September 2006, SECOR International, along with Entact Environmental Services,
<br /> commenced pipeline abandonment and removal activities at 525 West Weber Avenue in theIN
<br /> Waterfront Towers Parking facility in accordance with SECOR's Pipeline Removal, '
<br /> Abandonment, Soil Excavation, On-Site Horizontal SVE Well Installation, and Horizontal SVE f
<br /> Well Installation Beneath Delta View Apartments Report and Work Plan for Pipeline Removal,
<br /> Abandonment, and Soil Excavation in Waterfront Towers Parking Lot dated February 10, 2005.
<br /> A report entitled Pipeline Removal, Abandonment, Soil Excavation, and Parking Lot '
<br /> Reconstruction summarizing remedial activities and parking lot restoration at the Waterfront n
<br /> Towers Parking facility is currently scheduled to be submitted late third or fourth quarter 2007.
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