2020-11-09-minutes-public-works-study-session

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Levee Embankments For use during Initial and Continuing Eligibility Inspections of levee segments 1 systems Bated Item Rating Rating Guidelmer LoeattanlResearkwRecommendattem M Trask debris, unauthorized farming activity, structures, excavations, or other obstructions KLOC 2017 a 0013: Statical_] 31+50: Fence a: the present, or inappmpniate activities noted that should be corrected but will not inhibit mdward toe.: NA (A) operations and maintenance or emergency operations. Encroachments have not been KLOC_2017 a_0015: Station_] 8+50: Gate across levee reviewed by the Corps. crown. Snorsec has key.: NA (A); Any structures, buildings utifitishould be shrd ed to determinenot fficluded in theintial ode and analysis of the levee. U Unauthorized encroachments or inappropriate activities noted am liltely to inhibit ope alio s and maintenance, emergency operations, or negatively impact the integrity o. the levee.terry 4, Closure S-tuctw-es (Slop Lag, Earthen Closures, NA A Cosurc structaire in good repair. Placing equipment, stoplogs, and other materials are readily available at all tithes. Components are clearly merited and installation instructions/ procedures readily available. Trial erections have beer accomplished in accordance with the ]There are no closure structures incorporated in this levee segment. Gates, or Sandbag O&M Manual. Closures) (A or U only) U Any of the following issues is cause for this rating: Closet structure in poor condition. Pays missing or connded. Placing equipment may not be available within the anticipated warning time. The storage vaults cannot be opened during the time of inspection. Components of closure are not clearly marked and installation instructions/ procedures are not reads_y available. Trial erections have not been accomplished in accordance with the O&M Menuxl. NIA There are no closure structures. along this component of the FDR segment 1 system. 5. Slope Stability A A No slides, sloughs, tension cracking slope depressions, or bulges are present. No slope stability issues were noted at the time of the inspection. Although vegetation was rated unacceptable, the ur-wanted vegetation growth did not significantly interfere ithe rating of this ittem. M Minor slope stability problems that do not pose an immediate threat to the levee embanlmtent. U Major slope stability problems (ex. deep seated sliding) identified that must be repaired to reestablish the integrity of the levee embankment, 6. Erosion! Bank M A No erosion or bank caving is observed on the landward or riverward aides of the levee that KLOC 2017_a 0001: Station—] 38+00: Station—2 36+50: Caving might endanger its stability. Location of ongoing rehab with Seattle District Scheduled repair) u far 'nor necessary 2018.: Monitor and repair, as necessa M There are areas when minor erosion is occurring or has occurred on or near the levee embankment, hart levee integrity is not thtealaned U Erosion or caving is occurring or has occurred that threatens the stability and integrity of the levee. The erosion or caving has progressed into the levee section or into the extended footprint of the levee foundation and has compromised the levee foundation stabSlity. 7. Settlement' A A No observed depressions in crown. Records exist and indicate no unexplained historical No settlement was noted at the time of the inspection. changes. M Minor irregularities that do not threaten integrity of levee. Records are incomplete or inclusive. U Obvious variations in elevation over significant reaches. No records exist or records indicate that design elevation is compromised. Key; A = Acceptable. M = Minimally Acceptable; Maintenance is required. U = Unacceptable. 1v/A = Not Applicable. FDR = Flood Damage Reduction Flood Damage Reduction Segment I System Levee Embankments Inspection Report Page 2 of 5 US Army Corps Klocke (KLOC) of Engineers®