3301 SEAWAY BLVD WHOLE SITE 2025-10-30

Jane Zimmerman From: Dan Balmelli <dbalmelli@barghausen.com> Sent: Monday, November 21, 2016 7:28 PM To: Paul McKee Cc: Sabrina Fandler Subject: RE: Bertch Phone Call Attachments: Scan0300.pdf; Seaway Center- Response to City of Everett 3rd Party Review Comments.pdf Hi Paul and Sabrina, Attached are copies of the storm pond sections of the King County Storm Manual, DOE Storm Manual and City of Kent Storm Manual which have been highlighted in green showing the areas relating to pond setbacks. The storm manuals have slightly different setback requirements but all require a geotech analysis to address open ponds adjacent to slopes and when requesting a reduced setback. The proposed storm pond has always been proposed adjacent to the slope as shown on the current plans. During the preapplication meeting,the city requested that the original proposed wetpond be revised to eliminate the dead storage/water quality element and provide a mechanical water quality structure to reduce saturation of the slope. The SEPA and Site Plan review application the project was approved with the buildings,site plan layout and storm facility located in the location currently shown. During the Site Work Construction Plan review process,the city requested a specific geotech analysis addressing the design and location of the storm pond relative to the slopes. It was determined that the city did not have the resources to review the geotech report so a 3rd party peer review geotechnical engineer was retained by the city to review the geotech report. The applicants geotech engineer has addressed the comments and concerns of the citys peer review geotech engineer with the updated report which I previously forwarded. The mitigation includes installation of a double wall pond liner with a leak detection device to prevent seepage and saturation along the pond slope. The applicant would propose the following additional mitigation measures in addition to the mitigation measures outlined in the geotech response letter(attached) 1.The applicant would agree to increase the width of the pond berm along the slope from 6 ft to 15 ft to provide. additional mitigation/safety factor and increase the setback of the pond from the slope. 2.The applicant would agree to provide the city of Everett with a hold harmless letter relative to any damage, repair or maintenance required along the slope caused by any failure of of the storm pond. Please review and let me know if you need any additional information. Thanks for your assistance. Dan Balmelli Executive Vice President (206) 396-8588 ce1 1/3—