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ARCADIS Mr. Eric Rapport <br /> April 21, 2011 <br /> Changes to slope monitoring and management methods were recommended in the <br /> Second Quarter 2010 Status Report prepared by ARCADIS and dated July 14, 2010. <br /> The upslope cracks would be raked to a loose level surface. The surface should not <br /> be compacted as that could result in additional desiccation cracks. If cracks reappear <br /> in subsequent visits, the cracks would be noted, photos would be taken, and the <br /> cracks would be an indication of slope movement. In addition, discontinuing slope <br /> stake monitoring was recommended. <br /> In a letter dated July 22, 2010, the RWQCB approved boulder management activities, <br /> discontinuing slope stake monitoring, and the slope monitoring methods described <br /> above. Historical slope stake monitoring measurements and slope monitoring <br /> observations are presented in Tables 11 and 12. <br /> Recommendations were also made in the Second Quarter 2010 Status Report to <br /> remove dangerous rocks from the slope to eliminate danger that could pose a threat <br /> to people or property at the toe of slope. Approximately 380 rocks were removed from <br /> the slope during December 13 through December 17, 2010. A Boulder Management <br /> Summary Report was submitted to the RWQCB on January 11, 2011. <br /> To enhance surficial slope stability and combat the loss of root system slope support <br /> in the vicinity of the June 2007 derailment and spill, UPRR prepared and submitted a <br /> Re-vegetation Plan dated August 30, 2010 to the RWQCB and the Storrie Resort <br /> property owners. In a letter dated October 19, 2010 the RWQCB concurred with the <br /> activities proposed in the Revegetation Plan. Native plants will be planted along the <br /> affected slope, irrigated, and monitored. Unsuccessful plants will be replaced as <br /> appropriate. The work is scheduled to begin during the Spring of 2011. <br /> References <br /> CH2M Hill 2008a. Response to Cleanup and Abatement Order R5-2008-0712, Site <br /> Cleanup Program Case#2050298, UPRR Storrie Derailment, Plumas County. <br /> October 29. <br /> Regional Water Quality Control Board (RWQCB). 2007. Order to Submit Information <br /> Pursuant to California Water Code Section 13267; Union Pacific Railroad, <br /> Denatured Ethanol and Canola Oil Spill, Storrie, Plumas County. August 31. <br /> Regional Water Quality Control Board (RWQCB). 2008. Amended Cleanup and <br /> Abatement Order R5-2008-0712, Site Cleanup Program Case#2050298, <br /> UPRR Storrie Derailment, Plumas County. December 18. <br /> 1\Arcadis-us\officedatalFolsom-CA\Aproject\UPRR\RC000738-UP RR-StorrieTeliverables\QuarterlyReports120111Q1-2011VIinaltedlQ-2011Storrie Status Rpt(4-21- Page' <br /> 11).doc 7/9 <br />