HomeMy WebLinkAboutStormwater Plan for COM2011-00104 - PLN General - 11/7/2011 e r
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 2005 Department of Ecology Stormwater 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
j with the author, staff should refer the case to the Planning Manager or Director.
Applicant's Name: r 21 RK lJolf"t S
Permit# aM 00 U Y Parcel# (��/ — 0Oct "
Date(s) of the Document(s) reviewed:
SECTION I—Construction SWPPP Narrative
(1) Construction Stormwater Pollution Prevention Elements:
(a) Describe how each of the Construction Stormwater Pollution Prevention Element has been
addressed through the Construction SWPPP.
OK? Comment:
(b) Identify the type and location of BMP's used to satisfy the required element.
OK? Comment:
(c) Written justification identifying the reason an element is not applicable to the proposal.
OK? Comment:
(d) 12 Required Elements—Construction Stormwater Pollution Prevention Plan
(1) Mark Clearing Limits.
OK? Comment:
(2) Establish Construction Access.
// OK? Comment:
(3) Control Flow Rates.
OK? Comment:
C •1 '� (4) Install Sediment Controls.
�^ OK? Comment:
C ��4.1 (5) Stabilize Soils.
�47 / OK? Comment:
(6) Protect Slopes.
OK? Comment:
(7) Protect Drain Inlets.
OK? Comment:
(8) Stabilize Channels and Outlets.
OK? Comment:
(9) Control Pollutants.
OK? Comment:
(10)Control De-Watering.
OK? Comment:
(11)Maintain BMP's.
OK? Comment:
(12)Manage the Project.
OK? Comment:
Page 1 Form Effective May 2009
(2) Project Description.
(a)Total project area (acres/square feet).
OK? Comment:
(b)Total Proposed impervious area (acres/square feet).
r An OK? Comment:
V.` (c)Total proposed area to be disturbed, included off-site borrow and fill areas (acres/square feet).
OK? Comment:
(d)Total volumes of proposed cut and fill (cubic yards).
*� OK? Comment:
(3) Existing Site Conditions.
(a) Description of the existing topography.
OK? Comment:
(b) Description of the existing vegetation.
OK? Comment:
(c) Description of the existing drainage.
OK? Comment:
(4)Adjacent Areas.
(1) Description of adjacent areas which may be affected by the site disturbance
(a) Streams
OK? Comment:
(b) Lakes
OK? Comment:
(c)Wetlands
OK? Comment:
(d) Residential Areas
OK? Comment:
(e) Roads
OK? Comment:
(f) Other
OK? Comment:
(11) Description of the downstream drainage path leading from the site to the receiving body of water
(minimum distance of 400 yards).
OK? Comment:
(5) Critical Areas:
(a) Description of critical areas that are on or adjacent to the site.
OK? Comment:
(b) Description of special requirements for working in or near critical areas.
OK? Comment:
(6) Soils: Description of on-site soils.
(a) Soil name
OK? Comment:
(b) Soil mapping unit
OK? Comment:
(c) Erodibility
OK? Comment:
(d) Settleability
OK? Comment:
(e) Permeability
OK? Comment:
(f) Depth
OK? Comment:
(g) Texture
OK? Comment:
Page 2 Form Effective May 2009
(h) Soil Structure
OK? Comment:
(7) Erosion Problem Areas.
(a) Description of potential erosion problems on site
OK? Comment:
(8) Construction Phasing.
(a) Construction sequence.
OK? Comment:
(b) Construction phasing (if proposed).
OK? Comment:
(9) Construction Schedule.
I. Provide a proposed construction schedule
OK? Comment:
II. Wet Season Construction Activities
(a) Proposed wet season construction activities.
OK? Comment:
(b) Proposed wet season construction restraints for environmentally sensitive/critical areas.
OK? Comment:
(10)Engineering Calculations. Provide design calculations.
(a) Sediment Ponds/Traps.
OK? Comment:
(b) Diversions.
OK? Comment:
(a) Waterways.
OK? Comment:
(b) Runoff/Stormwater Detention Calculations.
OK? Comment:
(11)Operations and Maintenance
(a). 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) Declaration of Covenant will be required to
cover all privately owned and maintained stormwater facilities. O & 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 together with this completed Checklist.
OK? Comment:
SECTION II—Erosion and Sediment Control Plans
(1) General.
(a) Vicinity Map.
OK? Comment:
(b) Clearing and Grading Approval Block.
OK? Comment:
/ (c) Erosion and Sediment Control Notes.
OK? Comment:
l `((22) Site Plan.
(a) Legal description of subject property.
OK? Comment:
(b) North Arrow.
OK? Comment:
Page 3 Form Effective May 2009
(c) Indicate boundaries of existing vegetation, e.g. tree lines, pasture areas, etc.
OK? Comment.-
(d) Identify and label areas of potential erosion problems.
OK? Comment:
(e) Identify any on-site or adjacent surface waters, critical areas and associated buffers.
OK? Comment:
(f) Identify FEMA base flood boundaries and Shoreline Management boundaries (if applicable).
OK? Comment:
(g) Show existing and proposed contours.
OK? Comment:
(h) Indicate drainage basins and direction of flow for individual drainage areas.
OK? Comment:
(i) Label final grade contours and identify developed condition drainage basins.
OK? Comment:
(j) Delineate areas that are to be cleared and graded.
OK? Comment:
(k) Show all cut and fill slopes indicating top and bottom of slope catch lines.
OK? Comment:
(3) Conveyance Systems.
(a) Designate locations for swales, interceptor trenches, or ditches.
OK? Comment:
(b) Show all temporary and permanent drainage pipes, ditches, or cut-off trenches.
OK? Comment:
(c) Provide minimum slope and cover for all temporary pipes or call out pipe inverts.
OK? Comment:
(d) Show grades, dimensions, and direction of flow in all ditches, swales, culverts, and pipes.
OK? Comment:
(e) Provide details for bypassing off-site runoff around disturbed areas.
OK? Comment:
(f) Indicate locations and outlets of any dewatering systems.
OK? Comment:
(4) Location of Detention BMP's.
(a) Identify location of detention BMP's.
OK? Comment:
(5) Erosion and Sediment Control Facilities.
(a) Show the locations of sediment trap(s), pond(s), and pipe structures.
OK? Comment:
(b) Dimension pond berm widths and inside and outside pond slopes.
t OK? Comment:
(c) Indicate the trap/pond storage required and the depth, length, and width dimensions.
aAytli OK? Comment:
t v (d) Provide typical section views through pond and outlet structure.
OK? Comment:
(e) Provide typical details of gravel cone and standpipe, and/or other filtering devices.
OK? Comment.-
Detail stabilization techniques for outlet/inlet.
OK? Comment:
(g) Detail control/restrictor device location and details.
OK? Comment:
(h) Specify mulch and/or recommended cover of berms and slopes.
OK? Comment:
(i) Provide rock specifications and detail for rock check dams.
OK? Comment:
(j) Specify spacing for rock check dams as required.
OK? Comment:
Page 4 Form Effective May 2009
(k) Provide front and side sections of typical rock check dams.
OK? Comment:
(1) Indicate the locations and provide details and specifications for silt fabric.
OK? Comment:
(m) Locate the construction entrance and provide detail.
OK? Comment:
(6) Detailed Drawings.
(a) Any structural practices used that are not referenced in the Ecology Manual should be explained
and illustrated with detailed drawings.
MIA OK? Comment:
(7) Other Pollutant BMP's.
C (a) Indicated on the site plan the location of BMP's to be used for the control of pollutants other than
�?f sediment, e.g. concrete wash water.
�- OK? Comment:
(8) Monitoring Locations.
(a) Indicate on the site plan the water quality sampling locations to be used for monitoring water
tj]A quality on the construction site, if applicable.
OK? Comment:
Are the Documents signed and stamped?_ t
Type and#of License: / 4— Wo
If not approved, what is the next action/recommendation for further action?
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�2 � -
7 Z'7 2_-
Reviewed by on
Time spent in review:
SECOND REVIEW/ UPDATE:
Reviewed by on
Time spent in second review:
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 5 Form Effective May 2009