The URL can be used to link to this page

Home My WebLink AboutStormwater Plan - PLN General - 5/5/2011 r 'Y Mason County Review Checklist For a Stormwater Plan Instructions: This checklist is intended to assist Staff in the review of a Stormwater Plan. The Stormwater Plan is reviewed for completeness with respect to the 1992 Department of Ecology Manual. If an item is found to be not applicable, the Plan should explain the basis for the conclusion.The Plan is also reviewed for clarity and consistency. If the drawings, discussion, or recommendations are not understandable, they should be clarified. If they do not appear internally consistent or consistent with the application or observations on site, this needs to be corrected or explained. If resolution is not achieved with the author, staff should refer the case to the Planning Manager or Director. Applicant's Name: f rnCJ Permit# Parcel# fr.:)Ita7 03V0® O Date(s)of the Document(s) reviewed: (1) Erosion and Sediment Control:All new development and redevelopment that includes land disturbing activities of one acre or greater shall comply with erosion and sediment control requirements 1-14, below. Compliance with the Erosion and Sediment Control Requirements shall be demonstrated through implementation of a large parcel erosion and sediment control plan. All new development and redevelopment that includes land disturbing activities of less than one acre shall comply with the small parcel minimum requirements found in Section 14.48.130, Compliance with the small parcel requirements shall be demonstrated through implementation of a small parcel erosion and sediment control plan. (a) Erosion and Sediment Control Requirement 1: Stabilization and Sediment Trapping. OK? L,*^ Comment: (b) Erosion and Sediment Control Requirement#2: Delineate Clearing and Easement Limits. OK? Comment: (c) Erosion and Sediment Control Requirement#3: Protection of Adjacent Properties. OK? ✓ Comment: (d) Erosion and Sediment Control Requirement#4: Timing and Stabilization of Sediment Trapping Measures. OK? I,,- Comment: (e) Erosion and Sediment Control Requirement#5: Cut and Fill Slopes. OK? b-'- Comment: (f) Erosion and Sediment Control Requirement#6: Controlling Off-Site Erosion. OK? 1� Comment: (g) Erosion and Sediment Control Requirement#7: Stabilization of Temporary Conveyance Chang Is and Outlets. � OK. y Comment: (h) Erosion and Sediment Control Requirement#8: Storm Drain Inlet Protection. OK?_J,,-' Comment: (i) Erosion and Sediment Control Requirement#9: Underground Utility Construction. OK? 1/ Comment: 0) Erosion and Sediment Control Requirement#10: Construction Access Routes. OK?_ Comment: (k) Erosio and Sediment Control Requirement#11: Removal of Temporary BMPs. OK? Comment: (1) Erosion and Sediment Control Requirement#12: Dewatering Construction Sites. Page 1 of 3 Form Effective May 2009 OK? t"'_ Comment: (m) Erosion and Sediment Control Requirement#13: Control of Pollutants Other than Sediment on fpastruction Sites. OK? Comment: (n) Erosion and Sediment Control Requirement#14: Maintenance. OK? V-�Comment: (o) Erosion and Sediment Control Requirement#15: Financial Liability. OK?_�/Comment: (2) Preservation of Natural Drainage Systems. Natural drainage patterns shall be maintained, and discharges fir m the site shall occur at the natural location to the maximum extent practicable. - OK? L--� Comment: (3) Source Control of Pollution. Source control BMPs shall be applied to all projects to the maximum extent practicable. Source control BMPs shall be selected, designed, and maintained according to an approved manual. OK?__Z,,::f_C omment: (4) Runoff Treatment BMPs. All projects shall provide treatment of stormwater. Treatment BMPs shall be sized to capture and treat the water quality storm, defined as the six-month, twenty-four hour storm.The first priority for treatment of stormwater shall be to infiltrate as much as possible of the water quality design storm into the ground. Pretreatment of stormwater prior to infiltration into the�Gnd may be required. OK? Comment: (5) Streambank Erosion Control: The requirement below applies only to situations where stormwater runoff is discharged directly or indirectly to a stream, and must be met in addition to meeting the quirements in minimum requirement#4, Runoff Treatment BMPs. OK?omment: (6) Wetlands: Stormwater discharges to wetlands shall maintain the wetland's natural hydroperiod and flows to the extent needed to preserve or enhance its existing functions and values. Prior to proposing discharge of higher volumes of stormwater to a wetland, alternative discharge, detention, and infiltration practices located in areas outside the wetland shall be evaluated and employ01"yComment: the project engineer where feasible and practicable. OK? (7) Water Quality Sensitive Areas. Where the Mason County commissioners or their designee determine that the minimum requirements do not provide adequate protection of water quality sensitive areas, either on-site or within the basin, more stringent controls shall be required to protect water quality. An adopted and implemented basin plan (minimum requirement#9) may be used to develop requirements for water quality sensitive areas that are tailored to a specific basin. OK? V Comment: (8) Off-Site Analysis and Mitigation. Downstream analysis may trigger additional requirements. The project engineer shall provide a detailed qualitative analysis of the flow path of the discharge from the project site to the receiving water. This requirement shall apply to all projects where a drainage and erosion control plan is prepared, including those proposing retention facilities. This analysis shall include flow routing, and provide existing pipe and channel sizes and estimated capacities. In addition, the project engineer shall discuss any known or expected downstream erosion, flooding, or water quality problems, including those that may be caused by interflow from the proposed retention facility. The director or designee shall have the discretion to specify the distance and level of detail to be provided by the project engineer. In making this determination, the director or designee shall consider such factors as the relative size of the new development, availability of other hydrologic work for the drainage area, and the extent of which stormwater genemto on the project site is to be infiltrated. OK? V Comment: Page 2 of 3 Form Effective May 2009 i (9) Basin Platt in . Basin plan supersedes Manual. OK? P' Comment: (10) Operation and Maintenance. An operation and maintenance schedule shall be provided for all proposed stormwater facilities and BMPs, and the party(or parties) responsible for maintenance and operation shall be identified. An operation and maintenance(O&M)covenant will be required to cover all privately owned and maintained stormwater facilities approved by the director. O&M Covenant forms are available at the Mason County Public Works Office. A copy of the completed instrument shall be recorded with the Mason County Auditor's Office by the proponent and a copy of the recorded instrument is required to be submitted to the Public Works Department prior to final appro of the completed permanent stormwater facilities. OK? V Comment: (11) Financial Liability. Performance bonding or other appropriate instruments shall be required for all proj�ct,�fo ensure compliance with these standards. OK? yy Comment: Are the Documents signed and stamped?hO_. Type and#of License:. If not approved, what is the next action/recommendation for further action? ed s� Reviewed by Time spent in review: SE OND REVIEW/UPDA E: 5 o ,_ Reviewed by ' Y , on n L7 Time spent in second revi w: THIRD REVIEW/UPDATE: Reviewed by on Time spent in third review: Disclaimer: Mason County does not certify the quality of the work done in this Stormwater Plan. Page 3 of 3 Form Effective May 2009 1 Masson County Stormwater Checklist MD Project# : l Project Name Algrn q Nrtr»n Cn w 20/! EJgiT'N �RT�)?l AL D/SFt7s�c}L SirE Twnsp,Sec,Range Svc.. 27 T 24 tl R 3 w ua.Irv, . Minimum Requirements of 1992 Stormwater Manual The stormwater checklist identifies the minimum requirements of the 1992 Stormwater Manuat. The checklist is intended to identify the locations within the plan that addresses the minimum requirements. Mason County wilt not perform a technical evaluation of the submittal. Rather, the checklist provides a guide to allow Mason County to review the submittat and determine if the applicant has addressed the minimum features that make up a stormwater plan. It is incumbent upon the applicant and his/her engineer to fulfill all the applicable requirements of the 1992 Stormwater Plan as it relates to the proposed project. Review by Mason County is intended to determine if the plan has addressed the minimum requirements. Applicant's engineer shall be responsible for the technical accuracy of the submitted Stormwater plan. During construction of the project, the stormwater plan engineer of record or his/her authorized representative shall inspect the site to ensure the stormwater plan is being implemented as designed. Upon completion of the project, the engineer or his authorized representative shall be required to certify that the stormwater plan has been implemented as designed. Failure to meet the minimum requirements could result in delay or rejection of the application until the deficiencies are corrected. #1: Erosion and Sediment Control.All new development and redevelopment that includes land disturbing activities of one acre or greater shalt comply with erosion and sediment control requirements 1 through 14, below. Compliance with the Erosion and Sediment Control Requirements shalt be demonstrated through implementation of a large parcel erosion and sediment control plan. All new development and redevelopment that includes land disturbing activities of less than one acre shall comply with the small parcel minimum requirements found in Section 14.48.140, Compliance with the small parcel requirements shall be demonstrated through implementation of a small parcel erosion and sediment control plan. Erosion and Sediment Control Requirement#1: Stabilization and Sediment Trapping. S o�.-1 T---- A f See rage/paragraph�C .� 5 �5• �'o U h'sn ! PQ Erosion and Sediment Control Requirement#2: Delineate Clearing and Easement Limits. See Page/Paragraph et-4 54-F 5;: Column I ; aaaj e:&ph A Stormwater Cheddist DOE 1992 Manual.doc i Updated May 20,2009 I Erosion and Sediment Control Requirement#3: Protection of Adjacent Properties. See page/paragraph .2me,4 5 e F 6 /umm f 15 Phaaa✓wi1 $- Erosion and Sediment Control Requirement#4:Timing and Stabilization of Sediment Trapping Measures. See page/paragraph oaf s Colttvn n 1,: i70-4M,&rm A 4 61 Erosion and Sediment Control Requirement#5• Cut and Fill Slopes. See page/paragraph 5--, Co/u rn n 1 ; P"as re 1, A 5' Erosion and Sediment Control Requirement#6: Controlling Off-Site Erosion. See page/paragraph 5h cc;�' 5 dF S; Q(t%vrn n 1 ; PG,vi,..a rsp 6 R•!o Erosion and Sediment Control Requirement#7: Stabilization of Temporary Conveyance Channels and Outlets. See page/paragraph $hea+ 5 o�5 ; Co I u.nn l ; por•ea.,%v%Lip(i A7 Erosion and Sediment Control Requirement#8: Storm Drain Inlet Protection. See page/paragraph Jh ae+ 17 v wu, 1 • Paso 4�[•a�v� /�8 Erosion and Sediment Control Requirement#9: Underground Utility Construction. See page/paragraph .5heek- r2 5 ;Cg(avy�n I ; py-n-!� 'r V% 9 Erosion and Sediment Control Requirement#10: Construction Access Routes. See page/paragraph 5he-e-�- tj orr 7i Go(ta.Y.N e-1 A fO Erosion and Sediment Control Requirement#11: Removal of Temporary BMPs. See page/paragraph Shu�r S 0415 Co lyYr.%v, l; Va-^ma m Ipp-A It Erosion and Sediment Control Requirement#12: Dewatering Construction Sites. See page/paragraph 51nac- - 07c4 5., CtI c,.. nyl, l% Po-•�a �r O� ,A IZ Erosion and Sediment Control Requirement#13: Control of Pollutants Other than Sediment on Construction Sites. See page/paragraph SheP—� ri 652' Lc,(c�r,n rX 1� a ro►g ra.►� Erosion and Sediment Control Requirement#14: Maintenance. See page/paragraph Sf,f-e-+fio•FS-;Cot(A vti,v� i: ?b4g4p j,4 Erosion and Sedim�r�eennt Control Requirement#15• Fin racial Liabilipy. See page/paragraph S/x3e.-1- Sa•F 5 : fo/u�>7 !r /'ara►gys.,oh A l� #2: Preservation of Natural Drainaae Systems. Natural drainage patterns shall be maintained, and discharges from the site shall occur at the natural location to the maximum extent practicable. Seepage/paragraph. Co1 a trot &Ia rneh L3 Stormwater Cheddist DOE 1992 Manuat.doc 2 Updated May 20, 2009 El#3: Source Control of Pollution. Source control BMPs shall be applied to all projects to the maximum extent practicable. Source control BMPs shalt be selected, designed, and maintained acqxdHng to an approved manual. See page/paragraph 5 he e-- 5 o.V.".n 2,: ?&Mo. ,r4L V'A, C #4: Runoff Treatment BMPs. All projects shall provide treatment of stormwater. Treatment BMPs shall be sized to capture and treat the water quality storm, defined as the six-month, twenty-four hour storm. The first priority for treatment of stormwater shalt be to infiltrate as much as possible of the water quality design storm into the ground. Pretreatment of stormwater prior to infiltration into the ground may be required. �� See page/paragraph 15 0�7jr ( o I g.,r,rn #5: Streambank Erosion Control.The requirement below applies only to situations where stormwater runoff is discharged directly or indirectly to a stream, and must be met in addition to meeting the requirements in minimum requirement#4, Runoff Treatment BMP's. See page/paragraph 04-5 • E�i�.�,.,� Po.�a-��Tti. #6: Wetly Stormwater discharges to wetlands shalt maintain the wetland's natural hydroperiod and flows to the extent needed to preserve or enhance its existing functions and values. Prior to proposing discharge of higher volumes of stormwater to a wetland, alternative discharge, detention, and infiltration practices located in areas outside the wettand shalt be evaluated and employed by the project engineer where feasible and practicable. See page/paragraph-:5 4 �--' , off' co l"m v, Z : 94 M, F #7: Water Quality Sensitive Areas. Where the Mason County commissioners or their designee determine that the minimum requirements do not provide adequate protection of water quality sensitive areas, either on-site or within the basin, more stringent controls shall be required to protect water quality. An adopted and implemented basin plan (minimum requirement#9) may be used to develop requirements for water quality sensitive areas that are tailored to a specific basin. See pall/paragraph `thee-k-- 15 %IQ 5 1; 5,_sh t y.v,,h Z : �o..«, a�k.6r #8: Off-Site Analysis and MitbwtlOn. Downstream Analysis May Trigger Additional Requirements.The project engineer shalt provide a detailed qualitative analysis of the flow path of the discharge from the project site to the receiving water.This requirement shalt apply to all projects where a drainage and erosion control plan is prepared, including those proposing retention facilities. This analysis shall include flow routing, and provide existing pipe and channel sizes and estimated capacities. In addition, the project engineer shalt discuss any known or expected downstream erosion, flooding, or water quality problems, including those that may be caused by interim from the proposed retention facility.The Director of Public Works or designee shall have the discretion to specify the distance and level of detail to be provided by the project engineer. In making this determination, the Director of Public Works or designee shalt consider such factors as the relative size of the new development, availability of other hydrologic work for the drainage area, and the extent to which stormwater generated on the project site is to be infiltrated. Stormwater Cheddist DOE 1992 Manuat.doc 3 Updated May 20,2009 See page/paragraph :jlnc.eAr* S .4 S; Ca l if9: Basin Planning. Basin plan supersedes Manual „ See page/paragraph -*k r-i.rrF2 CaX ..,Z Panes a#10: Operation and Mair>tienance. An operation and maintenance schedule shall be Provided for all proposed stormwater facilities and BMPs, and the party (or parties) responsible for maintenance and operation shall be identified. An operation and maintenance(OftM) Declaration of Covenant will be required to cover all privately owned and maintained stormwater facilities. OB.M Declaration of Covenant forms are available at the Mason County Permit Assistance Center,426 W. Cedar Street, Shelton, WA 98584.The proponent shall record a copy of the completed Declaration with the Mason County Auditors'office. A copy of the recorded document must be submitted to the Permit Assistance Center tooethpr wIW this completed Cheddist. See page/paragraph Sh cc--\- Cc&uv,, i certify that the stormwater plan submitted for this project fulfills the applicable Provisions of the 1992 Stormwater Manual. - Zoi ( Engineer Date 7 Applicant Date Place signed Stamp Here 14144 P�► a � OS4@�W ��46JA1. Ec Stwmwater Checklist DOE 1992 Manuat.doc 4 Updated May 20,2009 I