7000 HARDESON RD 2018-01-02 MF Import

02•'10,,97 I0:33 FAT 200 848 8300 QUADIMMT CORI, +,. PNHLIC WORKS ADII 2002 003 Admirirrative Go m m un ity Dttices 1133 164tr St. SW Transit Suite 200 Lynnwood. WA 38037.8121 (2061 348-7100 January 2, 1997 Fax 348.2319 Executive Director Mr. Larry Crawford Joyce F. Olson Director of Engineering and Public Services City of Everett 3200 Cedar St Everett, WA 98201 RE: Compost Stormwater Filter System/Community Transit North Base Facility Dear Larry; This letter represents agreement between the City of Everett and Community Transit regarding maintenance, monitoring and contingency plans required by the Determination of Non -Significance (DNS) for SEPA 1013-96 dated Apirl 11, 1996 for the Community Transit/North Base Facility Compost Stormwater Filter (CSF) System. To meet the conditions for a monitoring plan, as specified in the DNS, Community Transit or their representative will install and operate equipment which will continuously monitor the level of water in the compost filter for a period of at least two years. A copy of the level record'Avill be provided to the City of Everett monthly. After the two year period. the continuous level monitoring equipment may, be replaced by a crest gage with weekly readurgs provided to the City quarterly. The first yesr of operation will be considered a trial year. During the first year of operation. Community Transit or their representative will use the results of the water level monitoring to develop a maintenance schedule tailored to this particular compost filter instillation. Maintenance activities will he planned and scheduled in response to decreases in hydraulic capacity detected by the water level monitoring so that valve adjustments, filter backflushing, and/or radial cartridge replacement o.cur prior to the flow re.te through the filter decreasing below the design flow rate, as evidenced by the level of water in the filter reaching the fiilter's overflow level. The trial period may be extended one year at the City's discretion if abnormal rainfall, monitoring equipment failure or other circumstances prevent sufficient collection of data Mantenance for the CSF system will be performed in accordance with the Compost Filter Stormwater Filter Type II Best Management Practices Document submitted to the City of Everett on July 9, 1996, or subsequently updates documents or procedures approved by the City of Everett. Snohomish County Public Transportation Benefit Area Corporation 111111111 02/10/97 10:36 TX/RX N0.0473 P.002