HomeMy WebLinkAboutStormwater Plan for COM2014-00135 - PLN General - 10/13/2014 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
with the author, staff should refer the case to the Planning Manager or Director.
Applicant's Name:
Permit#UL W( —1 `UG l /S Parcel# 1�� � `4 7- W C Z V
Date(s) of the Document(s) reviewed: U G 2 C�
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 )rough the Construction SWPPP.
OK? V Comment:
(b) Identify the pe 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 Requ red Elements—Construction Stormwater Pollution Prevention Plan
(1) Mark Clearing Limits.
OK? Comment:
(2) Establish Construction Access.
OK? Comment:
(3) Control Flow Rates.
OK? Comment:
(4) Install Sediment Controls.
OK? Comment:
(5) Stabilize Soils.
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 prof t area (acres/square feet).
OK? Comment:
(b)Total Prop sed impervious area (acres/square feet).
OK? Comment:
(c)Total pro sed area to be disturbed, included off-site borrow and fill areas (acres/square feet).
OK? Comment:
(d)Total vol es of proposed cut and fill (cubic yards).
OK? ; Comment:
(3) Existing Site Conditions.
(a) Descriptiq�of the existing topography.
OK? i Comment:
(b) Descripti of the existing vegetation.
OK? V Comment:
(c) Descripfo 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:
(II) Description of the downstream drainage path leading from the site to the receiving body of water
(minimu istance of 400 yards).
OK? Comment:
(5) Critical Areas'
(a) Descrip i n of critical areas that are on or adjacent to the site.
OK? Comment:
(b) Descripti- 7n of special requirements for working in or near critical areas.
OK? E/ Comment:
(6)Soils: Description of on-site soils.
(a) Soil n
OK? r Comment:
(b) Soil ma ing unit
OK? Comment:
(c) Erodibili
OK? Comment:
(d) Settleability
OK? Comment:
(e) Permeability
OK?�_Comment:
(f) Depth
OK? Comment:
(g) Textur
OK? Comment:
Page 2 Form Effective May 2009
(h) Soil St ru ture
OK? Comment:
(7) Erosion Problem Areas.
(a) Description of potential erosion proble s on site
OK? i Comment:
G
(8) Construction Phasing.
(a) Construction sequence.
OK? Comment:
(b) Construction phasing (if proposed).
OK? Comment:
(9) Construction Schedule.
I. Provide a� roposed construction schedule
OK?_S,Comment:
II. Wet Season Copstruction Activities
(a) Proposwet season construction activities.
OK? Comment:
(b) Proposed Ot season construction restraints for environmentally sensitive/critical areas.
OK?_,�,/ Comment:
(10)Engineering Calculations. Provide design calculations.
(a) Sediment Ponds/Traps.
OK? A IjA Comment:
(b) Divers o ,
OK?Comment:
(a) Waterway ,.
OK? omment:
(b) Runoff/ ormwater Detention Calculations.
OK? • r /! 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?_,-_A Comment:
-To V /Le-c-cr 1�1'1'�I
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:
(2} Site Plan.
(a) Legal description of subject property. i
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:
p (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.
OK? Comment:
(c) Indicate the trap/pond storage required and the depth, length, and width dimensions.
OK? Comment:
(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:
(f) Detail stabilization techniques for outlet/inlet.
OK? V Comment:
(g) Detail control/restrictor device location and details.
OK? Comment:
(h) Specify ri}(ilch and/or recommended cover of berms and slopes.
OK? 1/ Comment:
(i) Provide rgck 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 a locations and provide details and specifications for silt fabric.
OK?_V 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.
OK? Comment:
(7) Other Pollutant BMP's.
(a) Indicated on the site plan the location of BMP's to be used for the control of pollutants other than
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
quality on the construction site, if applicable.
OK? Comment:
Are the Documents signed and stamped? �
Type and#of License:
If not approved, what is the next action/recommendation for further action?
Reviewed by on
Time spent in review:
SECOND REVIEW/ UPDATE:
Reviewed by on
Time spent in second review:
THIRD REVIEW/UPDATE:
Reviewed by on
I
Time spent in third review:
Disclaimer: Mason County does not certify the quality of the work done in this Stormwater Plan.
I�
Page 5 Form Effective May 2009
Cohn 20�4 - oo 3 RECEIVED
OCT 13 2014
Mason County 4-26 W CEDAR ST
Construction Stormwater Pollution Plan Submittal Checklist
Project Name:
Parcel #'s: a Q ,�)Oa —42- 00
County Project No.: 7 A IZ 2D l4 — ODES-!-
Author of Report:
Minimum Reauirernents of the DOE 2005 Stormwater Manual
The Stormwater checklist identifies the minimum requirements of the DOE 2005 Stormwater Manual.
The Checklist is intended to identify the locations within the plan that addresses the minimum
requirements Mason County will not perform a technical evaluation of the submittal. Rather, the
checklist provides a guide to allow Mason County to review the submittal 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
2005 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.
Section 1—Construction SwrJPP Narrative
1. Construction Storm*ater Pollution Prevention Elements
)�7a_Describe.how each of the Construction Stormwater Pollution Prevention Element has been
addressed though the Construction SWPPP.
b. Identify the type and location of BMPs used to satisfy the required element.
c.Written justification identifying the reason an element is not applicable to the proposal.
12 Required Elements—Construction Stormwater Pollution Prevention Plan
1. Mark Clearing Limits, See page/paragraph
2. Establish Construction Access, See page/paragraph
3. Control Flow Rates, See page/paragraph '
*4. Install Sediment Controls, See page/paragraph
-*5. Stabilize Soils, See page/paragraph
l:\Community Development\PAC\STORMWATER 1 of 5 Updated May 20,2009
_6. Protect Slopes, See page/paragraph
_7. Protect Drain Inlets, See page/paragraph
8. Stabilize Channels and Outlets, See page/paragraph
9. Control Pollutants, See page/paragraph
10. Control De-Watering, See page/paragraph
11. Maintain BMPs, See page/paragraph
12. Manage the Project, See page/paragraph
2. Project Description
a. Total project area. Acres 's ,0 4+ Sq. Ft.��CC
b. Total proposed impervious area. Acres Sq. Ft.
c. Total proposed are to be disturbed, included off-site borrow and fill areas.
Acres Sq. Ft.
d. Total volumes of proposed cut and fill. Cubic Yards 500 C-
3. Existing Site Conditions
a. Description of the existing topography. See page/paragraph �SL30SS a UJt55I
b. Description of the existing vegetation. Seepage/paragraph �C
RxcoT —EkS ja'l,nf PG4�}�—
1
c. Description of the existing drainage. See page/paragraphs I
4. Adjacent Areas
I. Description of adjacent areas that may be affected by the site disturbance
a. Streams, See page/paragraph
_b. Lakes, See page/paragraph
c. Wetlands, Scc;page/paragraph
_d. Residential Areas, See page/paragraph
e. Roads, See page/paragraph AA ''
_f. Other, See page/paragraph 14 o N tr
_II. Description of the downstream drainage path leading from the site to the receiving body of waxer.
(Minimum distance of 400 yards), See page/paragraph— _rHAAA PIIAU44
2c?p
5. Critical Areas
a. Description of critical areas that are on or adjacent to the site.
See page/paragraph IVY U�
b. Description of special requirements for working in or near critical areas.
See page/paragraph N • Al.
I:\Community DevelopmentTAC\STORMWATER 2 of 5 Updated May 20,2009
6. Soils
Description of on-site soils. (:;►LAJ" LoA-van
a. Soil name(s), See page/paragraph
_b. Soil mapping unit, See page/paragraph Ark �T E
c. Erodibility, See page/paragraph LoLj -
d. Settleability, See page/paragraph R�, n)
e. Permeability, See page/paragraph �AbLG(U s -To
f. Depth, See page/paragraph 24 - 3 t)u
g. Texture, See page/paragraph
_h. Soil Structure, See page/paragraph
7. Erosion Problem Areas
_ Description of potential erosion problems on site. See page/paragraph M t\)I M AJ
8. Construction Phasing
_a. Construction sequence, See page/paragraph (:::::'n-AOE CZIOST(I.u.C.T Cam► .SIE5
b. Construction phasing(if proposed) , See page/paragraph J A .
9. Construction Schedule II .11
1. Provide a proposed construction schedule,See page/paragraph LZ t riTe(L FALL-2,0 14
II. Wet Season Construction Activities ,n
a. Proposed wet season construction activities, See page/paragraph�,,(A-&kXi D evua 5
b. Proposed wet season construction restraints for environmentally sensitive/critical areas. See
page/paragraph A) �.
10.Engineering Calculations
Provide.Design Calculations.
_a. Sediment Ponds/Traps, See page/paragraph N . A
b. Diversions, See page/paragraph IU ,
c. Waterways, See page/paragraph
d. Runoff/Stornrwater Detention Calculations, See page/paragraph • 7� . ( O�5 P er5i �
11.Operations and Maintenance.
An operation and maintenance schedule shall be provided for all proposed storniwater 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
owne main s. O&M Declaration of Covenant forms are available at
the Oason County Permit Assistance Center,426 W. Cedar Street, Shelton, WA 98584. The
propone recor opy o e e ed 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. See page/paragraph \
I:\Comrnuniry Updated May 20,2009
T,)LI\j\t
Section II—Erosion and Sediment Control Plans
1. General
X a. Vicinity Map, See page/paragraph
? b. Clearing and Grading Approval Block, See page/paragraph
c. Erosion and Sediment Control Notes, See page/paragraph
2. Site Plan
x a.Legal description of subject property
b. North Arrow
c. Indicate boundaries of existing vegetations, e.g.tree tines, pasture areas, etc.
d. Identify and label areas of potential erosion problems, See page/paragraph '
e. Identify any on-site or adjacent surface waters, critical areas and associated buffers
Pl f� f. Identify FEMA base flood boundaries and Shoreline Management boundaries (if applicable), See
page/paragraph O'A.
X g. Show existing and proposed contours
X h. Indicate drainage basins and direction of flow for individual drainage areas
Y, i. Label final grade contours and identify developed condition drainage basins
Yj. Delineate areas that are to be cleared and graded
X_k. Show all cut and fill slopes indicating top and bottom of slope catch lines
3. Conveyance Systems
a. Designate locations for swales, interceptor trenches, or ditches
b. Show a'u temporary and permanent drainage pipes, ditches, or cut-off trenches required for erosion
and sediment control
c. Provide minimum slope and cover for all temporary pipes or call out pipe inverts
d. Show grades, dimensions, and direction of flow in all ditches, swales, culverts, and pipes
N R e. Provide details for bypassing off-site runoff around disturbed areas
f. Indicate locations and outlets of any dewatering systems
4.Location of Detention BTVPs
P�- a. Identify location of detention BMPs.
5.Erosion and Sediment Control Facilities
a. Show the locations of sediment trap(s),pond(s), and pipe structures.
b. Dimension pond berm wid*u2s and inside and outside pond slopes.
N c. Indicate the trap/pond storage required and the depth, length, and width dimensions.
d. Provide typical section views through pond and outlet structure.
I_\Community Development\PACWORMWATER 4 of 5 Updated May 20,2009
r�e. Provide typical details of gravel cone and standpipe, and/or other filtering devices.
f. Detail stabilization techniques for outlet/inlet.
ON- g. Detail.controU restrictor device location and details.
X h. Specify mulch and/or recommended cover of berms and slopes.
i. Provide ruck specifications and detail for rock check darns.
j. Specify spacing for rock check dams as required.
N P k. Provide front and side sections of typical rock check dams.
X 1. Indicate the locations and provide details and specifications for silt fabric.
tJ A�- m. Locate the construction entrance and provide a deta-ill.
6.Detailed Drawings
g
6I�- a. Any structural practices used that are not referenced in the Ecology Manual should be explained and
illustrated with detailed drawings.
7. Other Pollutant BM)rs
s) Pr- a. Indicate on the site plan the location of BMPs to be used for the control of pollutants other than
sediment, c_g. concrete wash water.
S.Monitoring Locations
pJ P�- a. Indicate on the site plan the water quality sampling locations to be used for monitoring water quality
on the construction site, if applicable.
I certify that the stormwater plan submitted for this project fulfills the applicable provisions of the 2005
DOE Stormwater Manual.
Engineer Date .
L
Applicant Date
.+fy
Place eng. stamp and sign/date above.
BCommunity DevelopmentTAMSTORMWATER 5 of Updated May 20,2009
5
Si PPP
FOR
S)<OINEHE+ NGE GARDENS
Tax Account No.: 22302-42-00170
OQ 1 GE
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O�°90� 1406 o O0
DO�SSIONAL E GSA
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Date: October 2014
Developer: Ed Melillo
1001 Fourth Ave.
Suite 3200
Seattle, WA 98154
Engineer: Frederick A. Kegel, P.E., P.L.S.
835 Kegel Lane S.E.
Port Orchard, WA 98367
Phone: 360-876-0500
File: 141346
SWPPP Narrative
The subject site is a 5+/- acre parcel of land, located in rural Mason County,
Washington, on the Tahuya Peninsula, in a community know as"Toonerville". This site
has been previously developed for a single family residential complex consisting of
cleared and graded areas, a residence, and a large detached garage. The existing access
driveway from Toonerville Road to the home site is approximately 600 feet long. The
cleared and graded are, parking area, and structures areas comprises approximately 1.6
acres. The new green house structures will be established within the already developed
graded area.
The storm water runoff patterns have already been established and appear to be
well controlled by the extensive natural forested areas being preserved in strategic areas.
This natural vegetation effectively removes the silt from su-face runoff waters.
There should be minimal erosion being caused by the minor grading and
construction of the green houses. However, silt fence should be placed in strategic
locations to help control erosion/sedimentation hi the runoff'
Therefore, the 12 basic elements of a SWPPP are addressed as follows:
1. There are no additional clearing limits required for green house construction.
2. There is no need for a stabilized construction entrance, as the project site is 800
feet +/- away from Toonerville Road. Both driveway and Toonerville are gravel roads.
3. Soils are classified as Alderwood and also Everett Gravelly Sandy Loams. These
soils are quite gravelly, and are generally low risk erosion soils. Therefore, excessive
erosion is not expected as the existing site is quite stabilized. Flow rates are generally
controlled by native vegetation dispersion and existing systems. Adjacent properties will
not be affected.
4. It is recommended that silt fencing be installed along the lower portion, adjacent
to the driveway,just below the lower green house (see plan sheets).
5. It is recoruiiended to stabilize disturbed soils by straw mulching and seeding
areas to grass.
6. Slopes will be seeded to grass and covered with straw mulch.
7. One drain inlet will be protected by silt fencing and 2" —4" quarry spall armoring.
8. Channels are not basically stabilized. Minimal need for additional stabilization.
9. There are no extraneous pollutants with this project. Concrete truck washouts
will be accomplished well away from storm water channels.
r
DETAIL --- SITE PLAN
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