HomeMy WebLinkAbout2008-07-16 MSCWMO Ltr to OPH1 3 8 0 W E S T F R 0 N T A G E R 0 A D, H I G H W A Y 3 6
S T I L L W A T E R, M I N N E S T 0 A 5 5 0 8 2
P h o n e 6 5 1. 2 7 5. 1 1 3 6 x 2 2 f a x 6 5 1. 2 7 5. 1 2 5 4 W W w. rn s c W rn o. 0 r g
Jul 16, 2008
Eric Johnson, Administrator
Cit of Oak Park Hei
PO Box 2007
Oak Park Hei MN 55082
RE: McKean's S Historic Villa
Dear Mr. Johnson,
Oak Park Might-,
l
a
Dayto W 11
7W
Pi
MSCW
west I
Lakelallcl
I _ p
t al land
L eland
L
Lakeland 1
Tw
Lai Pland
J La
tan! pies
L ake.
S
St t
t If' aly-s
M
suet
The Middle St. Croix Watershed Mana Or ( MSCWMO) received re submittal items on Ma 6,
2008 for the proposed McKean's S Historic Villa project, located within MSCWMO boundaries and in the cit of
Oak Park Hei The proposed project q ualifies for full review under the MSCWMO 2006 Watershed Mana Plan
( WMP).
The project, as submitted,, does not meet all Policies and Performance Standards contained within Section 5.0 of the
MSCWMO WMP. However, the project is conditionall approved. The followin conditions must be met:
1. Pro must meet the Desi Standards for Structural Stormwater Mana Measures of the State of Minnesota
Stormwater Manual, November 2005, or the most recent edition. The followin item must be addressed:
a. Plantin plan detailin establishment of ve suitable for h of basin
b. Secondar outlet provided
c. Separation from seasonall saturated soils or bedrock is 3 feet or more
The applicant must submit a plantin plan for the proposed bioretention basin. The applicant must also provide a
revised cop of the plans showin that the bioretention basin has an emer overflow. A soil borin is needed
within the proposed bioretention basin to show that separation from saturated soils or bedrock is 3 feet or more.
Project representatives must submit all re additional information b Au 1, 2008. Final approval will be g ranted
when all re additional information has been submitted to the MSCWMO.
Conditional approval does not constitute approval b the cit of Oak Park Hei The enclosed checklists contain
detailed information on project review q ualification and the policies and performance standards of the WMP. Feel free to
contact me at 651-275-1136 x21 or peter. y oun g @ mnwcd.or if y ou have an q uestions re these comments.
Sincerel
Pete Youn
En Specialist, Washin Conservation District
cc: Vicki VanDell, P.E., Folz Freeman Erickson, Inc., 12445 55th Street North, Lake Elmo, MN 55042
Al Black, Presb Homes, 2845 North Hamline Avenue, Roseville, MN 55113
Enclosures ( 2)
Middle St. Croix Watershed Mana Or Member Communities
Afton, Ba Ba Lakeland, Lakeland Shores, Lake St. Croix Beach, Oak Park Hei St. Mar Point, Stillwater, Et West Lakeland
Stillwater
MIDDLE ST, CROIX WATERSHED MANAGEMENT ORGANIZATION
�ak Park Hei
1 380 WEST FRONTAGE R A D H I G H W A Y 3 6
S T I L L W A T E R M I N N E S T 0 A 5 5 0 8 2 �X
P h o n e 6 5 1 2 7 5 1 1 3 6 x 2 2 f a x 6 5 1 2 7 5 1 2 5 4 w w w rn s c w rn o o r g
Two
MSCWMQ
West t
Lakeland
TWP
MSCWMO PROJECT REVIEW PROCESS REVIEW QUALIFICATION tal land
This document is for g uidance. Applicants should consult the MSCWMO Watershed
Mana Plan ( WMP ) for specific re
Each member communit will refer projects to the MSCWMO for full review when deemed
necessar based on the activities listed below. Each member communit will adopt the
MSCWMO review comments into the member communit comments for each pro
PROJECT NAME: McKEAN'S S HISTORIC VILLAGE - CITY OF OAK PARK HEIGHTS
THE FOLLOWING ACTIVITIES TRIGGER THE MSCWMO REVIEW PROCESS:
An pro undertakin g radin g , fillin or other land alteration activities that involve
movement of earth or removal of ve on g reater than 10,000 s feet of land
All ma subdivisions — ma subdivisions are defined as subdivisions with 4 or more lots
F An pro with wetland impacts
[:] An project with g radin g within public waters
[:] An pro with g radin g within the wetland buffer as identified in the plan
❑ An pro with g radin g within 40 of the bluff line
Redevelopment on a site of 5 acres or more, where pervious surface is disturbed and final
impervious surface, in a exceeds I acre or 5% of a site, that causes a chan in
runoff characteristics, or removal of ve
Development pro that impact 2 or more of the member communities
Performance Standards in Section 5 of the WMP will appl to development within the Middle St. Croix
watershed and focus on stormwater mana erosion and sediment control, and wetland protection. The
Performance Standards will appl to all pro that tri the MSCWMO review process. In addition,
whenever a project re a buildin permit that add five hundred (500) s feet of additional impervious
surface or a project re a variance from the current local impervious surface zonin re for the
propert the Performance Standards will appl Buildin permits for new construction in an approved ma
subdivision that meets the re of the Performance Standards are exempt from the water q uantit y and
q ualit y standards as lon as the individual propert does not exceed impervious surface percenta approved
for the g iven parcel in that subdivision. All projects re of whether public or private can be reviewed.
M i d d l e St C roix Watershed Mana Or Member Communities
Afton, Ba Ba Lakeland, Lakeland Shores, Lake St. Croix Beach, Oak Park Hei St. Mar Point, Stillwater, Et West Lakeland
1 380 WEST FRONTAGE ROAD, H I G H W 3 6
S T I L L W A T E R , M I N N E S T 0 A 5 5 0 8 2
P h o n e 6 5 1 2 7 5. 1 1 3 6 x 2 2 f a x 6 5 1. 2 7 5. 1 2 5 4 w w w rn s c w rn o o r g
' SC
`�
MS
We F - 1
MSCWMO PROJECT REVIEW PROCESS POLICIES AND PE RFORMANCE STANDARDS
1 land
4
.—S -'es
Cto Beach
t jM' a I Y.
This document is for g uidance. Applicants should consult the MSCWMO Watershed � Fs Pnt
Mana Plan ( for specific re
All re of the policies and performance standards contained within Section 5 of the
WMP must be met before the MSCWMO Board will approve the project.
PROJECT NAME: McKEAN'S SQUARE HISTORIC VILLAGE - OAK PARK HEIGHTS
MSCWMO POLICIES AND PERFORMANCE STANDARDS: [ A checked box itidiccites com ot- iiot a
r�7 Direct dischar of stormwater to wetlands and all other water bodies without water q ualit y
L!!2A
treatment is prohibited. WMP Section 5.1.4, Polic Item I
Sources of water pollution shall be identified throu the MSCWMO data collection
pro and corrected throu the application of BMPs. WMP Section 5.1.4, Polic Item 2
All h studies shall anal the 24-hour two- (2.75 inch), ten- ( 4.15 inch) and one
hundred- (5.9 inch) critical rainfall event, with the critical duration defined as that event
causin either the hi water surface elevation or the lar peak dischar in an area or
both. An stud must use consistent methodolo for the pre-development and post-
development land use conditions. The methodolo must be approved b MSCWMO.
WMP Section 5.1.4, Polic Item 3
Newl developed or redeveloped areas will be limited to the predevelopment or existin
rate of runoff or to a rate within the capacit of downstream conve s
whichever is less, and no increase in the volume or rate of runoff from newl developed
areas will occur in areas where natural outlets do not exist. In sub-areas of a landlocked
watershed, development shall not increase the predevelopment volume or rate of dischar
from the sub-area for the 10- return period event. WMP Section 5.1.4, Polic Item 4
Runoff will be minimized throu on-site infiltration or prevented throu reduction in
impervious surfaces to the lar extent possible before detention ponds are used. WMP
Section 5.1.4, Polic Item 5
Site desi practices that ma have onl a minor ne impact on peak flow and volume,
such as the use of buffer strips alon receivin waters and draina swales, will be
promoted to achieve compliance with the water q ualit y performance standard. WMP Section
5.1.4, Polic Item 6
Middle St. Croix Watershed Mana Or Member Communities
Afton, Ba Ba Lakeland, Lakeland Shores, Lake St. Croix Beach, Oak Park Hei St. Mar Point, Stillwater, Et West Lakeland
Applicants must secure an flowa easements that would be re to accommodate the
stormwater mana facilities. These easements will be g ranted up to the 100- flood
level. WMP Section 5.1.4, Polic Item 7
Applicants will provide the MSCWMO with 100- flood levels on the ponds, lakes, and
streams as parcels are developed. WMP Section 5.1.4, Polic Item 8
The MSCWMO has adopted the Washin Count Floodplain Re (Appendix
H . WMP Section 5.1.4, Polic Item 9
Project must meet the Desi Standards for Structural Stormwater Mana Measures
of the State of Minnesota Stormwater Manual, November 2005, or the most recent edition at
www .pca.state.mn.us/water/stormwater/stormwater-manual.html. WMP Section 5.1.4,
Per Standard I,- WMP Section 5.2.4, Performance Standard I
Desi re for bioretention basins:
Ade pretreatment upstream of bioretention practice(s)
Construction phased so that impervious area construction is complete and
pervious areas have established ve before stormwater is introduced
into bioretention practice(s)
Pondin depth of bioretention basin is 18 inches or less
Drawdown time of the bioretention practice(s) 48 hours or less from the
peak water level
❑ Plantin plan detailin establishment of ve suitable for h
of basin
Eas access provided for routine maintenance of infiltration practice(s)
Maintenance plan clearl identifies lon maintenance schedule and
responsibilit
�] Secondar outlet provided.
Separation from seasonall saturated soils or bedrock is 3 feet or more
Z Enhanced volume runoff controls will be desi to retain on-site the first 1/2 inch of runoff
for all impervious areas plus 1/4 inch of runoff for areas with compacted soils. 'MP Section
5. 1.4, Per Standard 2
a. Impervious areas or surfaces are defined as a surface in the landscape that impedes
the infiltration of rainfall and results in an increased volume of surface runoff.
b. Compacted soils are defined as surfaces in the landscape where the underl soils
are compacted b construction or other activit that impedes the infiltration of
rainfall and results in an increased volume of surface runoff.
c. In redevelopment scenarios, volume control standards appl onl to areas of new
construction, where soils are compacted, runoff characteristics are chan or
ve is removed.
Z No increase in rate of runoff leavin the site from pre-development to post-development
conditions g enerated b the 24-hour two- ( 2.75 inch ten- (4.15 inch and one hundred-
Middle St. Croix Watershed Mana Or Member Communities
Afton, Ba Ba Lakeland, Lakeland Shores, Lake St. Croix Beach, Oak Park Hei St. Mar Point, Stillwater, Et West Lakeland
(5.9 inch) critical rainfall events. WMP Section 5.1.4, Performance Standard 3; WMP
Section 5.2.4 Performance Standard 2
® A Stormwater Pollution Prevention Plan (SWPPP) that meets the National Pollutant
Discharge Elimination System (NPDES) requirements must be submitted to and approved
by the MSCWMO for all projects undertaking grading, filling, or other land alteration
activities which involve movement of earth or removal of vegetation on greater than 1 0,000
square feet of land (See Appendix J for NPDES requirements). WMP Section 5.1.4,
Performance Standard 4, WMP Section 5.2.4, Performance Standard 3
SWPPP Requirements:
® Description of the nature of the construction activity
® Address the potential for discharge of sediment and/or other potential
pollutants from the site
Identify a person knowledgeable and experienced in the application of
erosion prevention and sediment control BMPs who will oversee the
implementation of the SWPPP and the installation, inspection and
maintenance of the erosion prevention and sediment control BMPs before
and during construction
® Identify who will have the responsibility for long -term operation and
maintenance of the permanent stormwater management system
® Identify a chain of responsibility with all operators on the site to ensure
that the SWPPP will be implemented and stay in effect until the
construction project is complete, the entire site has undergone final
stabilization, and a Notice of Termination has been submitted to MPCA
® Narrative describing the timing for installation of all erosion prevention
and sediment control BMPs
• Location and type of all temporary and permanent erosion prevention and
sediment control BMPS along with procedures to be used to establish
temporary BMPs as necessary for the site conditions during construction
• Standard plates and/or specifications for all BMPs used on the project
• Site map with existing and final grades, including dividing lines and
direction of flow for all pre and post - construction stormwater runoff
drainage areas located within the project limits
• Site map including impervious surface areas and soil types; area of each
must be noted (in square feet or acres
Z Location of areas not to be disturbed
® Location of areas where construction will be phased to minimize duration
of exposed soil areas
® Identify all surface water and wetlands within 1 /z mile of the project that
will receive stormwater runoff from the construction site
® Methods to be used for final stabilization of all exposed soil areas
• Describe procedures to routinely inspect the construction site (once every
7 days and within 24 hours after a rainfall event greater than 1 /2 inch)
• Describe practices to properly manage and dispose of solid waste
• Describe practices to properly manage hazardous materials
Middle St. Croix Watershed Management Organization Member Communities
Afton, Bayport, Baytown, Laketand, Lakeland Shares, Lake St. Croix Beach, Oak Park Heights, St. Mary's Point, Stit[water, EL West L_aketand
Describe practices for external washing of trucks and other construction
vehicles (concrete trucks, etc.)
® Describe spill prevention plan
® Describe measures to address sanitary and septic waste
® .Direct discharge of stor mwater to wetlands and all other water bodies without water quality
treatment is prohibited. WMP Section 5.1.4, Performance Standard 5
F;J Predevelopment conditions shall assume "good hydrologic conditions" for appropriate land
covers as identified in TR.-55 or an equivalent methodology. The meanings of "hydrologic
soil group" and "runoff curve number" are as determined in TR -55. However, when
predevelopment land cover is cropland, rather than using TR -55 values for cropland, the
following runoff curve numbers (RCN) shall be used. These curve numbers represent
midrange values for soils under a good hydrologic condition where conservation practices
are used and are selected to be protective of the resource waters. WHIP Section 5.1.4,
Performance Standard
Hydrologic Soil Group I Runoff Curve Number
A
56
B
70
C
79
D
83
Conversion of high - permeability soils shall be avoided and these soils shall. be targeted for
infiltration. WMP Section 5.1.4, Performance Standard 7
Lowest floor elevations of structures built adjacent to stormwater management features and
other water bodies must be a minimum of two feet above the 100 -year flood elevation and a
minimum of two feet above the natural overflow of landlocked basins. The landowner or
developer is required to provide MSCWMO with the location of the 1.00 -year flood elevation,
natural overflow elevation, and lowest floor elevations. WMP Section 5.1.4, Performance
Standard S
F Buffer zones of unmowed natural vegetation shall be maintained or created upslope of
delineated wetland edges, ordinary high water elevation, or floodplain of all water bodies
(wetlands, streams, lakes) in accordance with the Performance Standards relating to
wetlands, Section 5.3.4. WMP Section 5.1.4, Performance Standard 9 [not applicable]
® Detention facilities will be designed to attenuate peak flows and provide on -site infiltration
in high - permeability soils, natural depressions, and swales. WMP Section 5.1.4,
Pe rf a rinance Standard 10
The MSCWMO shall require proper erosion and sediment control throughout the watershed
to prevent siltation and sedimentation of streams, lakes, wetlands, and other areas of the
watershed. WMP Section 5.2.4 Policy Item I
Middle St. Croix Watershed Management Organization Member Communities
Afton, Bayport, Baytown, Lakeland, Lakeland Shores, Lake St. Croix Beach, Oak Park Heights, St. Mary's Point, Stillwater, Et West Lakeland
Both temporary (during construction) and permanent (long -term) erosion control will be
required on newt developed or redeveloped land in MSCWMO undertaking grading,
q Y p
filling, or other land alteration activities which involve movement of over 100 cubic yards
of earth or removal of vegetation on greater than 10,000 square feet of land. WMP Section
5.2.4 Policy Item 2
El Existing agricultural activities will be exempt from the performance standards listed in
WMP Section 5.2.4. MSCWMO will require buffers from waterbodies and support
agricultural BMPs. New agricultural activities must conform. to the performance standards
listed in WMP Section 5.2.4. WMP Section 5.2.4 Policy Item. 3 [not applicable]
® Construction is prohibited on slopes greater than 12 percent. Twelve percent (12 %) slopes
are defined as lands having average slopes 12°1 or greater over horizontal distances of fifty
feet 50 or more. WHIP Section 5.2.4 Performance Standard 4
Construction is prohibited within 40 feet of the top of blufflines in urban areas and 100 feet
in rural areas. Blufflines are defined as a line along the top of a slope connecting points at
which the slope, proceeding away from the waterbody or adjoining watershed channel,
becomes less than twelve percent (1.210 ). The location of the bluffline shall be certified by a
registered land surveyor or the zoning Administrator. WMP Section 5.2.4, Performance
Standard 5
® Land alteration activities are prohibited within twenty ( feet of the top of the bluff. Top
of bluff is defined as the highest point of a bluff with an average slope exceeding 1.210.
WMP Section 5.2.4, Performance Standard 6
[l Buffer zones of unmowed natural vegetation shall be maintained or created upslope of
delineated wetland edges, ordinary high water elevation, or floodplain of all water bodies
(wetlands, streams, lakes) in accordance with the Performance Standards relating to
wetlands, Section 5.3.4. WMP Section 5.2.4 Perf ornia ce Standard 7 [trot aplW icable]
Middle St. Croix Watershed Management Organization Member Communities
Afton, Bayport, Baytown, Lakeland, Lakeland Shores, Lake St.. Croix Beach, oak Park Heights, St.. Mary's Point, Stillwater, 8. West Lakeland