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` All emails, and attachments, sent to and from City of Everett are public <br /> records and may be subject to public disclosure pursuant to RCW 42.56. <br /> From: Erik Emerson <br /> Sent: Wednesday, November 01, 2017 5:14 PM <br /> To: Kirk Brooks <br /> Subject: 7030 Lower Ridge <br /> Kirk, <br /> I have reviewed the drainage report and plans submitted for the proposed Duplex at 7030 Lower Ridge Road. I have the <br /> following comments: <br /> 1. The report section for Minimum Requirement#5 does a good job addressing individual BMP feasibility. <br /> However, some of the reasons provided for infeasibility are inadequate to fully justify infeasibility. Please <br /> provide additional infeasibility justification for the following BMPs: <br /> • Permeable Pavement: Use of infiltration rate as an infeasibility criteria requires a determination of <br /> infiltration rate using field investigation (PIT test). Under the new Ecology manual a classification of soils as <br /> Till is inadequate justification for an infeasibility determination. <br /> • Bio-Retention: It appears that a selective placement of a bio-retention facility should be feasible on the site. <br /> Please provide further justification in support of this infeasibility determination or select a different <br /> infeasibility criteria <br /> 2. The report section for Minimum Requirement#7 notes that the project is below the 10,000 SF threshold in the <br /> 2014 Ecology Manual. However, the City of Everett requires detention for all projects over 5,000Sf of effective <br /> impervious surface. Note though that this threshold is applied at the TDA level. Based on the information <br /> provided it appears that the project will be below the 5,000 SF level within each of the TDAs so flow control will <br /> not be required. Please update the language of the text to reflect this difference and the threshold <br /> determination. <br /> 3. Downstream analysis and plan. City GIS indicates that the storm drainage system in Lower Ridge Road drains <br /> east from the catch basin located near the southeast corner of the property. Please indicate the pipes <br /> connecting the catchbasins shown and the direction of flow. <br /> Erik Emerson PE <br /> City of Everett, Public Works <br /> Senior Surface Water Engineer <br /> 3200 Cedar Street <br /> 2 <br /> 3 <br />