2202 100TH ST SW 2023-02-07 - Laserfiche WebLink

Page 4 of 5 Sabrina Fandler City of Everett Permit Services September 21, 2020 10. Access lids larger than the standard manhole lids shall be hinged and shall be capable of being opened and held open by a single individual. Please include this in your plans, including the detention vault access grate. Also, note that all access lids shall be equipped with a pick hole capable of being opened with a standard grate hook or handles. [DCSS 4-4.2(3)] Revised as requested, see added note on sheet 10 of the enclosed Civil Plans. 11. Is an additional access point needed for Cell 1 in the detention vault? The Manual requires that access openings for detention vaults be positioned at a maximum of 50 feet from any location within the vault. An additional access point has been added to each vault cell due to the vault lengthening from the POC analysis. See Sheet 11 of the enclosed Civil Plans for reference. 12. See the attached structural design vehicle loading for the detention vault. Our policy is to have the capability to bring City trucks onsite to vactor/jet the structure if the owner is not maintaining it. You will need to submit structural calculations, but this can be deferred to construction as a permit condition. Noted. The submittal of structural calculations/vault design will incorporate this structural design vehicle loading and will be deferred to construction as a permit condition. 13. Outfall Riprap Pads e. The riprap pads at the outfalls must be designed according to DCSS 4-2.5(1). See Section 6.3 of the enclosed Storm Drainage Report for design calculations as requested. f. Include the riprap specifications for the outfalls from DCSS Table 4-2.1 with the plan set. Rip -rap specification have been added to Sheet 10 of the enclosed Civil Plans as requested. g. Note that when designing the riprap pad, the perforated pipe is not equivalent to the use of a dispersion trench to distribute the flow out into a sheet flow condition. The maximum 100-year flow for a dispersion trench is 0.5 cfs, whereas the undetained 100-year flow tributary to the detention vault/diffuser tee is 1.10 cfs. The rip -rap pad underneath the diffuser tee has been design per DCSS 4-2.5(1). 14. Proposed Drainage Swale [See DCSS 4-2.6(1)] h. Note that the swale shall be compacted to a minimum of 95 percent compaction as verified by a Modified Proctor test. Include this with the plan set. Added as requested, see the section on Sheet 8 of the enclosed Civil Plans. i. The swale must have riprap filters as specified in DCSS 4-2.6(2). Include this with the plan set. Filter fabric has been added to the section on Sheet 8 of the enclosed Civil Plans as requested. 15. Where will the retaining wall perforated pipe drain to? The wall footing drain will outlet on the shared rip -rap pad with Culvert Outlet 78. See Sheet 8 of the enclosed Civil Plans for callout.