PR0535342 - Laserfiche WebLink

Home Browse Search

I , PANOCHE BURN SITE REMEDIATION 3.2.1 Weekly Project Status To document the remediation process, CH2M HILL and the CIWMB staff completed daily construction reports and progress summaries. The following weekly summaries are extracted from the CH2M HILL and CIWMB Construction Manager's Daily Status Reports, project correspondence, and documents in the CIWMB project files. Appendix F contains more detailed information about the project, including the daily construction and inspection reports and Sukut's Daily Work Reports of Personnel and Equipment. A complete photographic log of remediation activities is included in Appendix G. The progress schedule from the Sukut's work plan estimated a project duration of approxi- mately 30 work days (6 weeks) after mobilization, using 10-hour work days, with completion during the week of November 18, 1996. Week 1 -9/23/96 through 9/27/96 On September 25, 1996, the CIWMB Board approved the preliminary cost estimate of $450,000 for the Panoche Burn Site Remediation with Resolution 96-400. The CIWMB filed a Notice of Exemption with the State Clearinghouse on September 27, 1996. Week 2 -9/30/96 through 10/4/96 Sukut prepared a Site-Specific Work Plan (WP) and submitted the information to the reviewing agencies for comment and review. The WP included project overview, scope of services, project schedule, site-specific health and safety plan, and cost estimate. The WP was approved by the CIWMB with minor modifications to dust control methods. Week 3 - 10/7/96 through 10/11/96 CH2M HILL completed the final design report and specifications and submitted the report to the reviewing agencies. Initially, the retention basin was designed to hold the 100-year storm and release the 1,000-year event. After discussions with the California DFG and the Central Valley RWQCB, the elevation of the spillway was lowered to decrease the "attractiveness" of the retention basin to wildlife yet still maintain a large.enough retention basin to capture sediment. The retention design was field-adjusted to fit the canyon. Week 4- 10/14/96 through 10/18/96 Sukut mobilized equipment to the site, set up a source for construction water, and performed health and safety training and medical monitoring of personnel. After a review of the Sukut's WP, the DFG requested native plant and seeding be used with erosion control netting and Ion--term monitoring and maintenance. The CIWMB engineer provided erosion specifications and seed mix, which is listed in the final design report. Week 5 - 10/21/96 through 10/25/96 Decontamination procedures were practiced, and personnel exposure monitoring began. Sukut began pushing the ash down the canyon side slopes and consolidating the ash in a designated area at the upper end of the canyon. Because fugitive dust was increasing, the CIWMB engineer requested Sukut to supply additional dust control. A survey crew was onsite to provide control, lay out the new retention dam, and stake the drainage swales at the CIWMB 12