HomeMy WebLinkAboutWF-99-017500 West 29th Avenue The City of
Wheat Ridge, Colorado 80215 Wheat
FAX 303/235-2857
February 2, 2000
Ms. Wendy Ammon Storrer
3375 Union Street
Wheat Ridge, CO 80033-2932
RE: WF*01
Dear Ms. Storrer:
Ridge
Please be advised that at its meeting of January 27, 2000, the Board of Adjustment APPROVED,
subject to conditions, your request for a Class II Flood Plain Exception to construct a single-family
residence on piers within the Flood Storage District on property located at 3365 Union Street.
Attached is a copy of the Certificate of Resolution stating the Board's decision which became
effective the date of the meeting. Should you decide to appeal the decision of the Board, you will
need to notify the Jefferson County district court in writing within 30 days of the Board's decision.
Please feel free to contact me at (303) 235-2846 if you have any questions.
Sincerely,
`X/u _
Barbara Delgadillo
Senior Secretary
/bd
Attachment: Certificate of Resolution
cc: WF-W-01
C:\Barbm\BOA\CORRESP\wt000I .wpd
CERTIFICATE OF RESOLUTION
I, Ann Lazzeri, Secretary to the City of Wheat Ridge Board of Adjustment, do hereby certify that
the following Resolution was duly adopted in the City of Wheat Ridge, County of Jefferson,
State of Colorado on the 27th day of January, 2000.
CASE NO: WF~Ol
APPLICANT'S NAME: Lee Storrer and Wendy Ammon Storrer
LOCATION: 3365 Union Street
Upon a motion by Board Member ABBOTT and second by Board Member HOVLAND, the
following resolution was stated:
WHEREAS, the applicant was denied permission by an administrative officer; and
WHEREAS, Board of Adjustment Application Case No. WF-00-01 is an appeal to this Board
from the decision of an administrative officer; and
WHEREAS, the property has been posted the fifteen days required by law, and in recognition
that there were no written protests registered against it, but also in recognition that there were
verbal concerns expressed to this Board from adjacent neighbors;
WHEREAS, the relief applied for may be granted without substantially impairing the intent and
purpose of the regulations governing the City of Wheat Ridge.
NOW, THEREFORE, BE IT RESOLVED that Board of Adjustment Application Case No.
WF-00-01 be, and hereby is, APPROVED.
FOR THE FOLLOWING REASONS:
1. The property in question is zoned Residential 1-A and the proposed use of the property
for a single family dwelling is permitted as a principal use in that district. The lot is of
sufficient size for the district in that it exceeds the minimum requirements for lot area and
width. The property is located within the single family residential area; therefore, the
proposed use is compatible with the surrounding neighborhood and is in conformance
with the City's Comprehensive Plan.
2. Referrals were sent to Bob Goebel, Director of Public Works and Flood Plain
Administrator, and to Bill DeGroot, Chief of the Flood Plain Management Program
for the Urban Drainage and Flood Control District. Mr. DeGroot responded with no
objections as long as the proposed first floor is a minimum of one foot above the 100-
year flood plain elevation.
Upon completion of his review of the application, Mr. Goebel outlined his findings in a
letter dated December 6, 1999 (attachment 7): "It is a requirement of the Flood Storage
District that the first floor elevation be established a minimum of one foot above the base
flood elevation. Therefore the lowest part of the structure, supported by the piers, shall
be at a minimum elevation of 5, 447.1 feet above sea level." This elevation will be
verified during construction and an elevation certificate from a professional land surveyor
must be submitted prior to issuance of a certificate of occupancy.
WITH THE FOLLOWING CONDITIONS:
All engineering provisions as set forth in the letter from Bob Goebel, Director of Public
Works, as submitted to the Board shall be complied with to the satisfaction of the city.
2. No storage of any kind, fence, playground equipment or any other item which could in
any way impact the flood storage area or the flood way shall occur within the flood
storage area or flood way portion of this property. This shall include areas under the
elevated portion of this structure.
3. Bob Goebel, Director of Public Works, shall review the engineering questions outlined in
a letter to the Board, dated January 26, 2000 from William G. Polivka, 12001 West 32nd
Drive and determine their merit as related to this case.
VOTE: YES: ABBOTT, BROWN, HOVLAND, HOWARD, JUNKER,
MAURO, THIESSEN
NO: ECHELMEYER
DISPOSITION: A Class II Flood Plain Special Exception Permit to construct a single
family residence on piers within the Flood Storage District was
APPROVED.
ADOPTED and made effective this 27th day of January, 2000.
BOB HOWARD, Chairman Ann Lazzeri, Secr6 ary
Board of Adjustment Board of Adjustment
CITY OF WHEAT RIDGE BOARD OF ADJUSTMENT
Minutes of Meeting
January 27, 2000
1. CALL THE MEETING TO ORDER: The meeting was called to order by Chair
HOWARD at 7:30 p.m. on January 27, 2000 in the Council Chambers of the Municipal
Building, 7500 West 29th Avenue, Wheat Ridge, Colorado.
2. ROLL CALL
Members Present: Tom Abbott
Michelle Brown
Bill Echelmeyer
Bob Howard
Paul Hovland
Susan Junker
Linda Mauro
Karen Thiessen
Staff Present: Meredith Reckert, Sr. Planner
Mary Austin, Planner
Bob Goebel, Public Works Director/Flood Plain Administrator
Ann Lazzeri, Secretary
The following is. the official set of Board of Adjustment minutes for the Public Hearing of January
27, 2000. A set of these minutes is retained both in the office of the City Clerk and in the
Department of Planning and Development of the City of Wheat Ridge.
3. APPROVE THE ORDER OF THE AGENDA
It was the consensus of the Board to approve the order of the agenda.
4. PUBLIC FORUM
(This is the time for anyone to speak on any subject not appearing on the agenda.)
There was no one signed up to speak.
5. PUBLIC HEARING
A. Case No. WF-99-01: An application by John and Wendy Ammon Storrer for a Class II
flood plain exception to construct a single family residence on piers within the 100-year
Flood Plain Flood Storage District. The property is zoned R-lA and located at 3365 Union
Street.
Board of Adjustment Page 1
01/27/00
This case was presented by Mary Austin. She reviewed the staff report, presented slides and
overheads of the subject property and entered all pertinent documents into the record. She
advised that all notification and posting requirements had been met and there was
jurisdiction for the Board to hear the case. Staff recommended approval for reasons outlined
in the staff report.
Following brief discussion, the applicant appeared before the Board.
Lee Storrer
3365 Union Street
Mr. Storrer was sworn by Chair HOWARD. He stated his desire for approval of his
application. In response to a question from Board Member ECHELMEYER, Mr. Storrer
explained that the line of trees was within his property line by approximately ten feet. He
also demonstrated the location of the proposed house on the overhead.
In response to a question from Chair HOWARD, Mr. Storrer replied that there would be no
basement in the house.
Mr. Goebel invited questions from the Board. Board Member ABBOTT asked if the code
administrator's concerns mentioned in the staff report had been resolved. Mr. Goebel
replied that his concern was related to whether or not the proposed dwelling fell under the
definition of "structure for human occupancy." This is a unique situation; the house will be
constructed so that the house itself will be above the flood plain level. But because the
foundation piers for the structural occupancy portion was in the flood plain, the codes
administrator felt it should come before the Board of Adjustment for proper review.
Board Member MAURO referred to previous discussions which indicated a new flood plain
would be defined for this area. Mr. Goebel.replied that in 1994-95 there was a problem with
the Lena Gulch channel that flowed behind these properties from 32nd Avenue. Through
the city's maintenance contract with Urban Drainage and Flood Control District (UDFCD)
Lena Gulch was improved by widening the channel, making it somewhat deeper and wider
and installing rock lining to stabilize the bank. These improvements were accomplished and
have reduced the flood plain. However, the city must abide by the old flood plain until a
flood plain study is completed and an amendment to that flood plain map takes place.
Board Member ABBOTT asked if there would be restrictions regarding outside storage,
solid fences, etc. that could trap debris during a flood. Mr. Goebel replied that fences would
not be allowed unless it could be proven that the fence is of a break-away design that would
not affect water flow. Further, the elevated portion of the house would be in an area of low
velocity rather than in the flood way. He also explained that the piers were designed to
prevent damming of debris; and, further, the requirement for one foot of free board above
the water surface elevation to the bottom of the beam holding the house up would also allow
for debris to pass through.
Board of Adjustment Paget
01/27/00
Elizabeth Polivka
12001 West 32nd Drive
Ms. Polivka was sworn by Chair HOWARD. She stated that her residence was to the south
and across the creek from the proposed structure. She submitted a letter from her husband
(who was unable to attend the meeting) stating opposition to the application. Mr. Polivka's
objections were based upon his evaluation of the hydrologic analysis prepared by the
applicant's engineer in his capacity as a geologist. His letter was made a part of the record.
She stated that her husband has had contact with Bob Goebel concerning this matter. She
also testified that she had seen a video (taken before they purchased their house) showing
flood waters coming very close to the rear of their home. She stated that her husband has
also contacted UDFCD regarding this matter.
Mr. Goebel stated that he met with the Polivka family the night before this meeting and
walked the property. He stated that the video she referred to was made before channel
improvements took place. The channel improvements should prevent flood waters from
coming so close to their house. Mr. Goebel stated that he took the highest water surface
elevation (determined to be the result of a 100-year storm) and added a foot to that to
determine the bottom of the beam that supports the house.
Board Member ECHELMEYER stated that he saw a large accumulation of driftwood
located where the stream bends to the northeast. In response to a question from Board
Member ECHELMEYER, Mr. Goebel stated that he didn't talk to neighbors to the north or
south of the property other than the Polivka's.
Marie Osse
12061 West 32nd Drive
Ms. Osse was sworn by Chair HOWARD. She stated her opposition to the application. She
did not believe a house should be built in this flood plain area. She referred to three major
floods which have occurred on her property since it was purchased in 1962; however,
channel improvements have taken place since that time. She also noted that there is a ten-
foot easement on the north side of Lena Gulch for the Colorado Ditch Company and she
thought the row of trees mentioned earlier by Board Member ECHELMEYER may
represent the property line. She also stated that, since channel improvements have taken
place, the proposed house could probably be worked out, but she wanted to make sure the
Storrer's weren't using any property that was in the easement.
Board Member ECHELMEYER asked why there were no written protests to this
application. Ms. Polivka replied that they were not notified of the application. Meredith
Reckert explained that, in addition to publishing the application, the city is only required
notify adjacent property owners and such notification took place.
Board Member ABBOTT asked Mr. Goebel if Mr. Polivka's questions had been resolved
during their meeting. Mr. Goebel replied that he didn't believe all of the questions had been
Board of Adjustment Page 3
01/27/00
resolved and, therefore, he suggested that Mr. Polivka write a letter to the Board since he
would not be able to attend the meeting.
Ms. Osse stated that flood waters topped the rock barriers two years ago and came up to her
patio which is adjacent to the stream. She asked the Board to consider that all the properties
upstream from the proposed structure could be affected.
Ms. Polivka stated their concern with the piers which could cause debris to back up and
create a damming effect during a 100-year flood.
John Stephens
12060 West 32nd Drive
Mr. Stephens was sworn by Chair HOWARD. He stated his opposition to building the
subject house in a flood plain. He was also concerned about debris backing up against the
piers during a flood. He stated that he has seen flood waters come above the rocks and also
go over 32nd Avenue.
Board Member ABBOTT asked for Mr. Goebel's opinion regarding government flood plain
elevations as opposed to resident's who testify that they have seen water higher than the
government lines show. Mr. Goebel replied that, as an engineer, he can only address
technical elements and the board must determine philosophical issues. Mr. Goebel
explained that the flood plain boundary is based on rainfall data, calculations, etc.
Board Member ABBOTT asked how a dam break would compare to a 100-year flood. Mr.
Goebel replied that a dam break would be of greater velocity and waters would rise more
quickly than in a 100 year flood.
David Osse
12061 West 32nd Drive
Mr. Osse was sworn by Chair HOWARD. He stated that he believed it was necessary to
change the flood plain boundaries to match up with the Lena Gulch improvements.
Marie Osse returned to the podium and asked why the channel improvements stopped at
Lewis Meadows City-owned open space to the east of the subject property. Mr. Goebel
stated that there were plans to continue channel improvements through the Lewis Meadows
area, but when the City purchased the area for open space, it was decided to leave the area in
a natural condition. -If requested to do so, staff would approach City Council about
improving the flood channel through this area.
Stan Ankoviak
12141 West 32nd Drive
Mr. Ankoviak was sworn by Chair HOWARD. He expressed opposition to the application
and expressed concern about the piers catching debris and causing a damming situation.
Board of Adjustment Page 4
01/27/00
Doug Trieste
14372 West Yale Place
Mr. Trieste was sworn by Chair HOWARD. He stated that he was the hydrologic engineer
for the applicant. He commented that the Federal Emergency Management Association
(FEMA) has a strict set of rules to serve as guidelines. He stated that those rules were
followed to the letter in this case, and the proposed house meets all those standards. Studies
show clearly that Mr. Storrer's property is completely out of the flood way and the piers in
question would receive a maximum of 1.1 feet of water during a 100 year flood with
velocities of 2 feet per second. He noted that one foot of water cannot float large pieces of
debris.
Board Member ECHELMEYER asked to know Mr. Trieste's credentials. Mr. Trieste stated
that he worked with the Bureau of Reclamation for fifteen years as a flood plain specialist
and hydraulics engineer.
Board Member ECHELMEYER expressed concern about the difference between flood plain
guidelines and testimony from residents in the area concerning water in their yards.
Board Member THIESSEN responded to Mr. Trieste's comments and stated that, although
the Board does not have the jurisdiction to make flood plain regulations, the fact that a
property meets a certain criteria is not a guarantee that a property will receive a special
exceptions permit. The case has to be made to the Board that the application will not be
detrimental to the area; and, while an application meets certain criteria, there may be some
philosophical and-precedence problems associated with the application. The Board must
decide if the application will be detrimental to the area.
Meredith Reckert suggested that if the Board felt a need to receive further information, the
hearing could be continued until the information received from Ms. Polivka could be
evaluated by the applicant's engineer.
Ms. Polivka indicated that she would be in favor of continuance so that her husband could
testify in person.
Mr. Storrer indicated that he did not desire a continuance.
Upon a motion by Board Member ABBOTT and second by Board Member HOVLAND, the
following resolution was stated:
Whereas, the applicant was denied permission by an administrative officer; and
Whereas, Board of Adjustment Application Case No, WF-99-01 is an appeal to this Board
from the decision of an administrative officer; and
Board of Adjustment Page
01/27/00
Whereas, the property has been posted the fifteen days required by law, and in recognition
that there were no written protests registered against it, but also in recognition that there
were verbal concerns expressed to this Board from adjacent neighbors;
Whereas, the relief applied for may be granted without substantially impairing the intent
and purpose of the regulations governing the City of Wheat Ridge.
Now, therefore, be it resolved that Board of Adjustment Application Case No. WF-99-01
be, and hereby is, approved.
Type of Exception: Request for a class II flood plain special exception permit to construct
a single-family dwelling on piers within the flood storage district.
For the following reasons:
The property in question is zoned Residential 1-A and the proposed use of the
property for a single family dwelling is permitted as a principal use in that district.
The lot is of sufficient size for the district in that it exceeds the minimum
requirements for lot area and width. The property is located within the single family
residential area; therefore, the proposed use is compatible with the surrounding
neighborhood and is in conformance with the City's Comprehensive Plan.
2. Referrals were sent to Bob Goebel, Director of Public Works and Flood Plain
Administrator, and to Bill DeGroot, Chief of the Flood Plain Management Program
for the Urban Drainage and Flood Control District. Mr. DeGroot responded with no
objections as long as the proposed first floor is a minimum of one foot above the
100-year flood plain elevation.
3. Upon completion of his review of the application, Mr. Goebel outlined his findings
in a letter dated December 6, 1999 (attachment 7): "It is a requirement of the Flood
Storage District that the first floor elevation be established a minimum of one foot
above the base flood elevation. Therefore the lowest part of the structure, supported
by the piers, shall be at a minimum elevation of 5, 447.1 feet above sea level." This
elevation will be verified during construction and an elevation certificate from a
professional land surveyor must be submitted prior to issuance of a certificate of
occupancy.
With the following conditions:
All engineering provisions as set forth in the letter from Bob Goebel, Director of
Public Works, as submitted to the Board shall be complied with to the satisfaction of
the city.
Board of Adjustment
01/27/00
2. No storage of any kind, fence, playground equipment or any other item which could
in any way impact the flood storage area or the flood way shall occur within the
flood storage area or flood way portion of this property. This shall include areas
under the elevated portion of this structure.
3. Bob Goebel, Director of Public Works, shall review the engineering questions
outlined in a letter to the Board, dated January 26, 2000 from William G. Polivka,
12001 West 32nd Drive and determine their merit as related to this case.
Board Member THIESSEN questioned the accuracy of the elevation figure of 5,447.1 feet.
Bob Goebel stated that he would verify the elevation to make sure that it is one foot above
the highest water surface point on the property.
Board Member ABBOTT commented that if Mr. Goebel's review of Mr. Polivka's letter
reveals a negative impact, the matter would come back to the Board of Adjustment.
Mr. Trieste commented that the one-foot elevation as defined by FEMA cannot be changed.
Board Member ECHELMEYER stated that he would vote against the motion based on his
obligation to the surrounding neighbors in regard to potential flooding problems.
Board Member THIESSEN asked what the applicant's options would be if the application
were to be denied. Meredith Reckert explained that the applicant could appeal to the District
Court. Also, if he changed the application and brought in new information, he could
reapply.
A vote was taken on the motion which carried by a vote of 7-1, with Board Member
ECHELMEYER voting opposed.
Chair HOWARD advised Mr. Storrer that his application had been approved
(Chair HOWARD declared a recess at 9:15 p.m. The meeting was reconvened at 9:20 p.m.)
B. Case No. WA-99-28: An application submitted by Jeff Nielsen for approval of a 10-foot
side yard setback variance from the 15-foot side yard setback requirement in an R-1 zone
district for the purpose of constructing a 24-foot by 24-foot detached garage on property
located at 3281 Routt Street.
This case was presented by Mary Austin. She reviewed the staff report, presented slides and
overheads of the subject property and answered the criteria involved in granting a variance.
All pertinent documents were entered into the record. She advised that all notification and
posting requirements had been met and the Board had jurisdiction to hear the case. Staff
recommended denial of the application for reasons outlined in the staff report.
Board of Adjustment Page 7
01/27/00
PUBLIC HEARING ROSTER
Case No. V r- -19-01
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CITY OF WHEAT RIDGE
PLANNING DIVISION STAFF REPORT
TO: Board of Adjustment
DATE OF MEETING: January27, 2000 DATE PREPARED: January 20, 2000
CASE NO. & NAME: WF-99-01/Storrer CASE MANAGER: Mary Austin
ACTION REQUESTED: Request for a Class If Flood Plain exception to construct a Single Family Dwelling
on piers within the Flood Storage District.
LOCATION OF REQUEST:
NAME & ADDRESS OF APPLICANT(S):
NAME & ADDRESS OF OWNER(S):
APPROXIMATE AREA:
PRESENT ZONING:
PRESENT LAND USE:
SURROUNDING ZONING:
SURROUNDING LAND USE:
3365 Union Street
Lee Storrer and Wendy (Ammon) Storrer
3375 Union Street
Wheat Ridge, CO 80033
Same as Above
11,720 ft.'
R-lA, Residential-One A
Vacant
N: and W: Residential-One A,
S: and E: Residential-One
N:, S:, and W: Single Family Residential E: Vacant
COMPREHENSIVE PLAN FOR THE AREA: Single Family Residential (4 do's per acre)
DATE PUBLISHED: January 7, 2000
DATE POSTED: January 13, 2000
DATED LEGAL NOTICES SENT: December 29, 1999
ENTER INTO RECORD:
( ) COMPREHENSIVE PLAN (X) CASE FILE & PACKET MATERIALS
(X) ZONING ORDINANCE (X) SLIDES
( ) SUBDIVISION REGULATIONS (X) EXHIBITS
( ) OTHER
The property is within the City of Wheat Ridge, and all notification and posting requirements have been met,
therefore, there is jurisdiction to hear this case.
I. REQUEST
The property in question is located at 3365 Union Street and is currently vacant. The property is
zoned R-1A, Residential-One A. (Attachment 1, Zoning Map).
The applicant (owner) is requesting approval of a Class II Flood Plain Special Exception permit
(Attachment 2, Application, Attachment 3, Deed and Attachment 4, Plat). The purpose of the request
is to allow for the construction of a single family dwelling on piers within the flood storage district.
(Attachment 5, Site Plan and Attachment 6, Aerial with Flood Plain Delineation).
II. APPLICATION REVIEW
According to the FEMA Flood Insurance Rate Map, a portion of the property is located within the
Lena Gulch 100-year flood plain. After review of the applicant's initial submittal, it was determined
by Darin Morgan, Codes Administrator, and Bob Goebel, Public Works Director and Flood Plain
Administrator, that the proposed piers located within the Flood Storage District act as a foundation
for a structure for human occupancy. Pursuant to Section 26-206 (D), of the Wheat Ridge Code of
Laws, a Class II Special Exemption Permit issued by the Board of Adjustment is required for
structures for human occupancy.
Referrals were sent to Bob Goebel, Director of Public Works and Flood Plain Administrator, and to
the Urban Drainage and Flood Control District. Bill DeGroot, Chief of the Flood Plain Management
Program for the Urban Drainage and Flood Control District, responded with no objections as long as
the proposed first floor is a minimum of one foot above the 100-year flood plain elevation.
Upon completion of his review of the application, Bob Goebel outlined his findings in a letter dated
December 6, 1999 (Attachment 7, Letter). It is a requirement of the Flood Storage District that the
finished floor elevation be established a minimum of one foot above the base flood elevation.
Therefore, the lowest part of the structure supported by the piers shall be at a minimum elevation of
5,447.1 feet above sea level. This elevation will be verified during construction and an Elevation
Certificate from a Professional Land Surveyor must be submitted prior to issuance of a Certificate of
Occupancy.
It is the opinion of the Flood Plain Administrator that the piers are the same as bridge piers within a
stream and that they need to be designed with the same considerations. As required by the Public
Works Department, the structural design of the piers must include an analysis of flows around the
base of the piers. The design requirements will be sent from Public Works to the Building
Department and made part of the building permit.
The property in question is zoned Residential-One A and the proposed use of the property for a single
family dwelling is a permitted principal use in that district. The lot is of sufficient size for the district
in that it exceeds the minimum requirements for lot area and width. The property is located within a
single family residential area. Therefore, the proposed use is compatible with the surrounding
neighborhood. The use is also in conformance with the City's Comprehensive Plan.
Board of Adjustment
WF-99-O1/Storrer
Page 2
III. STAFF CONCLUSIONS AND RECOMMENDATION
Upon review of the above request, staff concludes that the proposed construction of the single family
home on piers within the Flood Control District will not have a negative impact on the existing 100-
year flood plain. According to Flood Plain Administrator, Bob Goebel, the request has met the
requirements of the Flood Plain Ordinance. Therefore, staff recommends APPROVAL for the
following reasons:
1. Approval of the request should not have a detrimental impact on the existing 100-year
flood plain.
2. The requirements of the Flood Plain Ordinance have been met.
3. Bob Goebel, Flood Plain Administrator for the City of Wheat Ridge, recommends
approval of the special exemption permit.
Board of Adjustment Page 3
WF-99-01/Storrer
)4-3
II
LAKEWOOD
OFFICIAL
ZONING MAP
WHEAT RI D6E
COLORADO
MAP ADOPTED: fume 15, 1994
Last Revision: November 10, 1997
100-YEAR FLOOD PLAIN
(APPROXIMATE LOCATION)
ZONE D157RICT BOUNDRY
PARCEL/LOT BOUNDRY
(DESIGNATES OWNERSHIP)
CITY LIMIT LINE
WATER FEATURE
DENOTES MULTIPLE ADDRE55E5
N 29
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SCALE 1=400
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7500 WEST 29TH AVENUE WHEAT RIDGE, COLORADO 80215
December 6, 1999
Douglas J. Trieste
Flow Technologies
P.O. Box 260595
Lakewood, Colorado 80226
Re: Lee Storrer Property
Lena Gulch at Union Street / North Bank
Dear Mr. Trieste;
The City of ~OF WHEgT~
Wheat " ,
"'Ridge
C, 010 R ADO
I have completed my review of the proposed piers to be placed within the 100 year
flood plain at the referenced location. Your calculations have sufficiently determined
that the piers are not within the Floodway District, but rather within the Flood Storage
District. After review of this submittal with the Codes Administrator, he feels very
uncomfortable calling these piers structures for non-human occupancy when they
support and are the foundation for a single family residence which is for human
occupancy. Therefore, a Class II Special Exception will be required by the Board of
Adjustment. We can schedule this for their January 27, 2000 meeting.
The information which you have provided is adequate for the materials which are
required for the Board of Adjustment. I will forward a recommendation of approval to
them to allow this construction. Technically, it meets our requirement, yet they may
have some philosophical and precedence problems with this.
The structural adequacy of these piers during flood conditions is extremely important.
Several conditions must be placed on this approval to ensure their structural and
hydrodynamic capability and long term durability. Actual construction and permit
approval is subject to the conditions listed below.
The structural design of the piers must include analysis of flows around the base of the
piers. This design must account for several things. These are:
❑ Scour protection at their base.
❑ Load design for hydrodynamic pressure from the upstream side based on
your volume and velocity calculations.
❑ Load design for potential debris floating down the stream and impacting
these support structures.
❑ The depth and anchorage of the piers to withstand these forces.
❑ Possible installation of shear plates on the upstream side of the piers to
ATTACHMENT 7
14-/D (303) 234.5900 • ADMINISTRATION FAX: 234-5924 POLICE DEPARTMENT FAX: 235-2949
Page 2
Mr. Trieste
Flow Technologies
facilitate debris break-up.
❑ The possible installation of shear piers upstream of the proposed structure
to facilitate debris break-up in advance of the structure.
These piers are in essence the same as bridge piers within a stream and should be
designed with the same considerations. These requirements will be forwarded to the
Building Department and will be made a part of the Building Permit.
The base flood elevation for this analysis is the highest water surface elevation at the
west end of the site. Based on your cross section data, this shall be 5446.41 feet
above sea level. Therefore, the lowest point of the structure above these piers and
supported by these piers shall be at least one foot above this elevation which is
5447.41 feet above sea level.
During construction, this elevation must be verified and the same datum used. Prior to
issuance of the Certificate of Occupancy, you must submit to me an Elevation
Certificate stamped by a Professional Land Surveyor licensed in the State of Colorado.
If an adjustment in datum must be made, the backup information and analysis must be
submitted prior to approval and issuance of the Building Permit.
If you have any questions, please feel free to call me at 303-235-2860.
Very truly yours,
Robert Goebel, P.E.
Director of Public Works
Flood Plain Administrator
c: Darin Morgan, Codes Administrator
Meredith Reckert, A.I.C.P., Senior Planner
,4-( P
7500 West 29th Avenue The City of
Wheat Ridge, Colorado 80215 Wheat Ridg
FAX 303/235-2857
January 4, 2000
Dear Property Owner:
This is to inform you that Case No. WF-99-01 which is a request for approval of a Class II flood
plain exception to construct a single-family residence on piers within the Flood Storage District
and located at 3365 Union Street will be heard by the Wheat Ridge Board of Adjustment in the
Council Chambers of the Municipal Complex at 7500 West 29th Avenue. The meeting will be
held on January 27, 2000, at 7:30 p.m.
All owners and/or their legal representative of the parcel under consideration must be present at
this hearing. As an area resident or interested party, you have the right to attend this Public
Hearing and/or submit written comments. It shall be the applicant's responsibility to notify any
other person whose presence is desired at this hearing.
If you have any questions or desire to review any plans, please contact the Planning Division at
235-2846. Thank you.
Planning Division.
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NOTICE OF PUBLIC HEARING
Notice is hereby given that a Public Hearing is to be held before the City of Wheat Ridge
BOARD OF ADJUSTMENT on January 27, 2000, at 7:30 p.m. at 7500 West 29th Avenue,
Wheat Ridge, Colorado. All interested citizens are invited to speak at the Public Hearing or
submit written comments. The following petitions shall be heard:
Case No. WF-99-01: An application by Wendy Ammon for a Class II flood plain
exception to construct a single-family residence on piers within the Flood Storage District
and located at 3365 Union Street.
2. Case No. WA-99-28: An application by Jeff Nielsen for approval of a 10' side yard
setback variance from the 15' side yard setback requirement in an R-1 zone district for the
purpose of constructing a 24'x 24' garage on property located at 3281 Routt Street.
3. Case No. WA-00-01: An application by Jayne Armstrong for approval of a 360 sq. ft.
variance from the maximum building coverage of 600 sq.'ft. for a detached garage for the
purpose of constructing a 960 sq. ft. detached garage on vacant property zoned R-3 and
located south of 7650 West 47d Ave.
azbara Delgadillo, Recording Secretarf
ATTEST:
Wanda Sang,. City Clerk
To be Published: Wheat Ridge Transcript
Date: January 7, 2000
AA000127.wpd
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MEMORANDUM
DHPARThMW OF PUBUC WORKS
TO:
Board of Adjustment
FROM:
Bob Goebel, Public Works Director~~g
DATE:
February 23,.2000
SUBJECT:
Case No. WF-qq-01
3365 Union Street
Claoa II Flood Plain Exception
As directed by the Board in their requirements of approval of the referenced Claoo II
Flood Plain Exception, I have reviewed the concerns which Mr. Polivka had in his letter to
the Board. I spoke with Mr. Folivka and he wrote a followup letter to which I have
responded. To the best of my knowledge, the concerns have been or will be addressed.
This review has not changed my recommendation for approval.
c: Alan White, Director of Planning and Development
Mary Austin, Planner
The City of
7500 WEST 29TH AVENUE WHEAT RIDGE, COLORADO 80215 Wheat
GRidge
February 16, 2000
William G. Polivka, P.G.
12001 W. 32nd Drive
Wheat Ridge, Colorado 80033
Re: Case No. WF4W-01
3365 Union Street
Class II Flood Plain Exception
Lena Gulch Drainage
Dear Mr. Polivka:
Thank you for the video tape. I remember the day very well. It came after we had 17
straight days of rain in Wheat Ridge. The Consolidated Mutual Water Company's
Fabri-Dam at Maple Grove Reservoir buckled under the pressure from the water behind
it. The overflow pipe from the dam was not working properly and was being repaired at
the time of the incident. Because of the repair, the level of the water in the reservoir
could not be lowered in advance of the unanticipated 17 days of rain. The changeover
from air to water in the Fabri-Dam (a normal operation between winter and summer
months in both the Spring and Fall) had not yet occurred. We will keep the copy of the
tape for our records.
I spoke with Dave Lloyd of the Urban Drainage and Flood Control District (UDFCD)
regarding his assessment of the changes to the flood plain which may have occurred
when we completed the channel bank stabilization project in 1994. He feels strongly
that the changes were not significant enough to warrant a FEMA map revision. But he
and I both feel that the stabilization project did help the banks from severe erosion and
allows for freer flows in events similar to the one in the 1995 video. The volume for the
storm in the video was estimated to be on the magnitude of a 40 year event. Keep in
mind that there is a threshold of capacity at the 32nd avenue crossing. When the
capacity is reached, the flows overtop the structure and split to the street level and work
their way to both 32nd Drive and also to Vivian Drive. This split in flow allows the excess
flows to bypass the channel and uses the extra carrying capacity of the streets to carry
the additional flows over and above an event less than a 100 year storm in the channel.
In other words, during a 100 year event, Lena Gulch does not carry the entire 100 year
flows within the channel through this area. Therefore, a 50 or 60 year event may
appear to be at the same level within the channel as a 100 year event.
I spoke with the Parks and Recreation Director about the possibility of eliminating the
curves in the stream at the west end of the park. He stated that the public which
(303) 234-5900 • ADMINISTRATION FAX: 234-5924 POLICE DEPARTMENT FAX: 235.2949
Case No. WF-00-01
Mr. Polivka
Page 2
attended the master planning meetings for the park was emphatically against
disturbance of any kind to the natural meander of the stream and cited concerns for
disturbance of wildlife in the area. Therefore, in order to provide the flood flows through
the park in a more efficient manner, it would require the construction of the high flow
bypass channel very similar to the project completed downstream near Quail Street.
This project is presently not on the 5-year Capital Projects Plan for the City of Wheat
Ridge, nor on the 5-Year Capital Projects Plan for the UDFCD. Normally, we plan
these projects jointly with UDFCD in order to receive the 50-50 matching funds which
UDFCD provides for these projects. This project would have to have the support of the
neighborhood and be brought to the attention of your City Council Representatives so
that they and I can present the support for the project to the other six City Council
representatives for their consideration and funding. I will bring this to their attention by
copy of this letter as well as informing them in person at our regular Staff-Council
District meeting on March 8`h. Generally, drainage projects are constructed from
downstream in an upstream direction. There is a significant distance of the channel
which has not been improved downstream of this location. We must investigate to
determine the effects of these upstream improvements on downstream flows and
properties if they are considered for construction.
If I can be of further assistance, please do not hesitate to call me at 303-235-2860.
Very truly yours,
4~b~
Robert Goebel, P.E.
Director of Public Works
Flood Plain Administrator
c: Valerie Adams, City Manager
Janelle Shaver, Council Representative, District III
Odarka Figluss, Council Representative, District III
William G. Polivka, P.G.
12001 W. 32nd Drive
Wheat Ridge, CO 80033
303/205-0367
February 10, 2000
Mr. Bob Goebel, P.E.
Director of Public Works
City of Wheat Ridge
7500 W. 29d' Avenue
Wheat Ridge, Colorado 80215-6713
RE: Case No. WF-*Ol
3365 Union Street
Class II Flood Plain Exception
Lena Gulch Drainage
Dear Mr. Goebel:
Included for your assessment is a VCR tape of the May 1995 small scale flooding event.
I have reviewed the draft minutes to the January 27, 2000 meeting of the Board of Adjustment
regarding the referenced case number. I find positive points within the minutes which may benefit
all citizens residing along the Lena Gulch drainage:
1) It was recognized that the improvements to the floodway has likely altered the old 100- flood
zone and a new survey assessment may be required to redefine the 100-year flood plain;
2) Discussions in the meeting highlighted that previous plans were made to improve the Lena
Gulch channel throuuh the Lewis Meadows Open Space. The open space was left in a natural
state. It now appears as if the City may reconsider extending the channel improvements.
As a Wheat Ridge citizen, I applaud the past City of Wheat Ridge efforts to improve the Lena Gulch
floodway, thus increasing the flow characteristics through the 100-year floodplain. I trust in your
professional assessment of the concerns expressed in the January 27°i meeting and I pledge my
cooperation in any assessment and improvement of the existing and future floodplain. Some of the
neighbors have expressed that maybe widening and straightening the stream channel through the
Lewis Meadows Open Space would be to the benefit of all the surrounding neighbors. We will look
to the Wheat Ridge Public Works Department to provide guidance on how to proceed with this
proposal.
Sincerely,
William G. Polivka, P.G.
WGP/bp Enclosure: VCR Tape
William G. Polivka, P.G.
12001 W. 32nd Drive
Wheat Ridge, Colorado 80003
3031205-0367
January 26, 2000
Board of Adjustment
The City of Wheat Ridge
7500 West 29`' Avenue
Wheat Ridge, Colorado 80215
RE: Proposed
Class II Special Exception
100-Year Flood Plain
Lena Gulch Flood Storage District
Dear Sirs/Madams:
I want to thank the City of Wheat Ridge for the opportunity to review the structural design, site plan
map, and hydrologic information prepared forthe proposed structure referenced in the documentation
as 3365 Union Street, or the Lee Storrer Property (referred in this letter as 'the subject parcel').
The purpose of this letter is to respectfully petition the Board of Adjustment to deny a Class II Special
Exception to construct a residence within the Lena Gulch 100-year flood plain. The petition is
supported by the following:
Background statement;
Review of hydrologic information;
Philosophical and precedence concerns.
Background Statement
I am employed as a professional geologist with an engineering/environmental consulting firm and I
have a 22 year career in this discipline. My experience addresses geologic and hydrologic concerns
associated with environmental impact statements for proposed land use changes. The larger projects
have been prepared for the Army Corps of Engineers, the Department of Energy, the Bureau of Land
Management, and the Department of the Interior.
If this letter is presented to the Board in my absence it is because I am currently performing a stream
gauge survey of the Eagle River for an EPA CERCLA mine site near Gilman, Colorado.
CAMyFi les\flood-lettermpd
Board of Adjustment
Page 2.
My interest in the subject parcel arises from my professional interests and the location of my
residence, 12001 W. 32ntl Drive, Wheat Ridge - a parcel located on the right bank of Lena Gulch - and
south of the subject parcel.
Review of H *olo is Information
The report, Lena Gulch Floodwav Delineation Study in Vicinity of Mr. Lee Storrer's Property, dated
November 19,1999 and prepared by Flow Technologies of Lakewood, Colorado was reviewed forthis
letter. The report is qualified by statements provided within the report as follows:
(Top of page 2.) "Ideally, a "duplicate effective" model of the 100-yr WSEL (water surface
elevation) should be constructed based upon the hydraulic data used in the
Lena Gulch Master Drainage Plan the hydraulic data could not be located".
(Page 2., Paragraph 3.) "The 100-yr discharge used in performing the original (Lena Gulch
Master Drainage Plan) study was not known as explained (in the) above
(paragraphs). However, 1, 100 cfs (cubic feet per second) is likely very nearthe
100-yr discharge for the study reach per the Master Plan, and results in
reasonably duplicating the Master Plan 100-yr WSEL".
This suggests no one knows what flow volume would actually be in a 100-year storm event.
Inspection of the cross sectional data used for the computer flow calculations indicate possible
irregularities in the field data collection methodology.
• Cross section plots for River Stations (RS) 9600, 9578 represent the right bank endpoints as
topographically high features. I own the right bank property and there is no physical evidence
(a survey stake) or factual evidence (permission granted to the field crew) that the RS 9600
and RS 9578 right bank endpoints were ever surveyed. Additionally, the endpoint elevations
do not appear to accurately reflect the low grade immediately outside my basement walk-out
door, as presented in Figure 3 of the report.
• Cross section RS 9556 - The right bank topography is represented by a single point on high
ground approximately 65 feet away from the Lena Gulch Channel. The straight line
representation does not accurately reflect the actual land surface. Personal lawn mowing
experience indicates the south bank grading is relatively steep nearest toward the creek and
then it slowly gains elevation toward the area of the surveyed endpoint.
C:\MyFiles\flood-letter.wpd
Board of Adjustments
Page 3.
• Cross section RS 9556 - should have been a straight line perpendicular to the direction of
stream flow. However, inspection of the line of sight between the right bank endpoint and the
east side of the proposed residence creates an oblique cross section. This maximizes the
distance across the left overbank profile (north side), affecting the final flow/velocity
calculation.
Summarily, the information provided for the subject parcel study appears to be inaccurate and does
not represent the stream cross section.
Philosophical and Precedence Concerns
Philosophy is not one of my stronger points. However consider these questions:
• If humans gain knowledge and experience from those who go before them, tell me, why did
the lesser-educated developers set back the homes away from the creek channel?
• What is the philosophical and physical reasoning behind why fences, sheds, and other non-
human occupied structures are prohibited within the flood plain?
• If non-human occupied structures are prohibited, does that mean that only human occupied
structures should be allowed on the flood plain? Only kidding.
Which brings me to the topic of precedence concerns. It is my understanding that Lewis Meadows
open space park was formerly zoned for residential development. On the basis of its existence within
the flood plain, the land was ultimately rezoned, and the citizenry applauded the decision.
Lewis Meadows and the original setback developments on either side of Lena Gulch create precedent
land use reasoning against the construction of the subject parcel. With this perspective, and lacking
accurate hydrological data to support the subject parcel development, I respectfully petition the Board
of Exceptions to deny the proposed Class II Special Exception to the Lena Gulch Flood Storage
District.
Sincerely,
William G. Polivka
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Executive Committee:
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Cathy Reynolds
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Chairman
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Margaret Carpenter
Chairman Pro-Tem
City of Thornton
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Debra Vickrey
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Treasurer
Arapahoe County
Paul Danish w
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Secretary
Boulder County a,
Gretchen Cerveny
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Pat Cronenberger
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City of Littleton
B. H. Hoffmaster '
Engineer o
Kathleen MacKenzie °
City of Denver
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Carolyn McIntosh
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City of Lafayette
Fidel Montoya
City of Denver
Linda Morton
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Deborah Ortega
City of Denver
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John Paroske
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City of Aurora
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Art Patton
Engineer
Richard Sheehan
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James Sullivan
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Debra Vickrey
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Arapahoe County
L. Scott Tucker, Executive Director -
January 12, 2000
Mary Austin
Department of Planning and Development
City of Wheat Ridge Public Works
7500 West 29th Avenue
Wheat Ridge, CO 80215-6713
Dear Ms. Austin:
This letter is in response to your request for our comments concerning Case No.
WF-99-01, 3365 Union Street. We appreciate the opportunity to review this proposal.
The format of your referral notice, specifically the questions asked, does not fit with our
area of responsibility as far as providing the kinds of services which are the subjects of the
questions. Our interest is in the appropriateness of development within the 100-year
floodplain. From that standpoint, the only question we have is whether the proposed first
floor, including any basement or crawl space, of the proposed residential unit is at or
above the elevation specified in the Wheat Ridge Fooodplain Regulation. That information
did not appear to be contained within the information provided within your referral
package. The applicant should be required to indicate what the regulation requires and
how those requirements have been met. If they can do that, we would have no objection
to the location of this structure within the flood storage area.
If you have any questions concerning these comments, please contact me.
Sincerely
Bill DeGroot P.E~
Chief, Floodplain Management Program
WGD/gb
7500 West 29th Avenue The City of
Wheat Ridge Colorado 80033 Wheat
Telephone 303/ 235-2846 Ridge
December 27, 1999
The Wheat Ridge Department of Community Development has received a request for Class II Flood Plain Exception at the
property described below. Your response to the following questions and any comments on this proposal would be appreciated by
January 14, 2000. No response from you by this date will constitute no objections or concerns regarding this proposal.
CASE NO: WF-99-01
LOCATION: 3365 Union Street
REQUESTED ACTION: Class H Flood Plain Exception
PURPOSE: To construct a single-family dwelling unit in the Flood Storage District.
1. Are public facilities or services provided by your agency adequate to serve this development?
2. Are service lines available to the development?
3. Do you have adequate capacities to service the development?
4. Can and will your agency service this proposed development subject to your rules and regulations?
5. Are specific easements needed on this or any other document?
6. Are there any comments your agency has identified which would or should affect approval of this request?
Please reply to: Marv Austin
Department of Planning & Development
Fax: 303/235-2857
Water District O
Sanitation District O
Fire District O
Adjacent City
O
Public Service Co.
US West Communications
State Land Use Commission
State Geological Survey
Colorado Dept. Of Transportation
Colorado Div. Of Wildlife
Colorado Dept. of Natural Resources
Denver Regional Council of Governments
Scientific and Cultural Facilities Dist.
Metro Wastewater Reclamation Dist.
Jefferson County Planning Dept.
Completed by:
(Name, Agency/Department, Date)
Jeffco Health Department
Jeffco Schools
Jeffco Commissioners
TCI of Colorado
WHEAT RIDGE Post Office
WHEAT RIDGE Police Department
X WHEAT RIDGE Public Works Dept.
WHEAT RIDGE Park & Rec Commission
WHEAT RIDGE Forestry Division
WHEAT RIDGE Building Division
WHEAT RIDGE Economic Development
Fairmont Homeowners Association
Prospect Recreation District
X Urban Drainage and Flood Control Dist.
Regional Transportation Dist.
Denver Metro Major League Baseball Dist.
"The Carnation City"
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aF w egT9 LAND USE CASE PROCESSING APPLICATION of WHC4
o Planning and Development Department o
7500 West 29th Avenue, Wheat Ridge, CO 80033
c~L ORP~~ Phone(303)235-2846 QO OOR Pao
(Please print or type all information)
Applicant L-eE, F o r~EAddres 33'gS Ut-1voc-t ~k. Phone X38 3
amci We c ~c~~l S A C~~Cr' Cit t~F61P a { ~~c~c3~
Y
Owner Sam,!-* Address 33-~ ~5 rni n r1 S~Phone C) a C) 3
City lr-4I -n C~` c
Location of request (address) 3 3 C-P e5 ~t CD rn 1'-J 1-1ezt ~c1 e_~
Type of action requested (check one or more of the actions listed below which pertain to your request.)
❑ Change of zone or zone conditions ❑ Variance / Waiver
❑ Site development plan approval ❑ Nonconforming use change
❑ Special Use Permit ® Flood plain special exception
❑ Conditional Use Permit ❑ Interpretation of Code
❑ Temporary Use, Buildings, Signs ❑ Lot line Adjustment
❑ Minor Subdivision (5 lots or less) ❑ Planned Building Group
❑ Subdivision (More than 5 lots) ❑ Street Vacation
❑ Preliminary ❑ Final ll ❑gOther:
Detailed description of the request: N l/ a0
Fill out the following information to the best of your knowledge.
Current Zoning:
Size of Lot (acres or square footage):
Current use: V N _
Proposed use: 1 t~ G
Assessors Parcel Number:
I certify that the information and exhibits herewith submitted are true and correct to the best of my knowledge
and that in filing this application, I am acting with the knowledge and consent of those persons listed above,
without whose consent the requested action cannot lawfully be accomplished. Applicants other than owners
must submit power-of-attorne from the owner w Approved of this action on his behalf.
Signature of Applican -
`m; LO day of) e • ° , 19
Subscribe/dnd sworn to /m~e this
d~tGA a't-64
Nci ry Public
My commission expires
Date received Receipt No. Case No.
Related Case No. Zoning Quarter Section Map
12/21/1999 06:43
Bob BammeNin
County Treasurer
too Jefferacn County Pkwy.
Gowan, CO 80419-2520
(303) 271-8330 - Office
(303) 271.8322 - Automated
TAX DIST.
DOING 0U1
3P323d3986 AMMON, WENDY J.
Jtl-t-trsw)~ ~..vvly I . V~./VVr
SCHEDULE NO.
PROPERTY TAX STATEMENT
SECOND HALF TAX NOTICE
LOCATION
NION ST
TAXES
SEC.TY^LRNG.QTR." SQ.FT. LAND BLK LOT KEY BOOR YAG!
APPLEWOOD VILLAGE 2ND FLG
29 03 69 NE 850 DEC 93107256
28 03 68 1065 050 63107255
28 03 69 6380 0053 2067280
28 03 69 11720 62067280
AqM CaO I A0 To ?!9R APR 0 QE~sNllo
of ~o7"v~7 Vo- LJEAID ~ /4aP
E£ ~Toe&4?.
le- vl~
TAX AUTHORITY
SCHOOL
SCHOOL GEN
SCHOOL BND
COUNTY
CNTY GEN'L
DEV DISASL
R&B SRVCS
SOC SRVCS
CAP'TL EXP
LIBRARY
CNTY OTHER
WHR
NWLSD
UDFCD
WFD
39.4080
11.3000
13.7060
.5000
3.4130
2.1160
2.7200
3.1060
.0230
2,7140
7.7270
,7800
4.8200
AMOUNT PAID :
BALANCE DUE
ACTUAL LAND AND BUILDING 150.000
ASSESSED LAND AND BUILDING 15,540
ASSESSMENT PERCENTAGE
RESIDENTIAL PROPERTY 10.34% ALL OTHER PROPERTY 29.00%
BALANCE GOOD THRU 6-15-96
AMMON TERRANCE J
3375 UNION ST
WHEAT RIDGE, CO 80033
RECEIPT - 030796080013
612.40
175.60
212.97
7.77
53.04
32.88
42.27
48.27
.36
42.18
120.06
12.12
74.90
434.84
717.42
717.42
IF PAYING IN PERSON BRING ENTIRE TAX NOTICE
QrTAIN Ts4m PORTION FOR YOUR RECORDS.
FIN. INST.
Hydraulics
Hydrology
Water Resources
Mr. Robert Goebel, P.E.
Director of Public Works
7500 W. 29's Avenue
Wheat Ridge, CO 80215-6713
November 18, 1999
Re: Lena Gulch Floodway Delineation Study in Vicinity of Mr. Lee Storrer's
Property
Dear Mr. Goebel:
Per our meeting on October 15, 1999, a floodplain/floodway study was performed for the
referenced site. Such a study was necessary because a section of Mr. Storrer's planned
residence, to be constructed above piers, is located in the 100-yr floodplain as indicated
on Figure 2 (Attachments) which was copied from the site plan.
The proximity of the planned residence to the 100-yr floodplain and floodway is
illustrated on Figure 3 (Attachments). Per Figure 3, most of the planned residential
structure to be constructed above piers is located in the 100-yr floodplain, but no part of
that structure is located in the floodway. Note that Figure 3 illustrates only that section of
the complete residence located on piers.
The following summarizes our study results and methodology.
Study Methodology
Floodway delineation was performed by first duplicating the 100-yr water surface
elevation (WSEL) indicated on the Lena Gulch Master Plan,' and then determining the
floodway within the 100-yr floodplain. The floodway is defined per Wheat Ridge City
Code, Article 11, Section. 26-202 as: "The portion of the flood Regulatory District
required for the reasonable passage or conveyance of the 100-yr flood which is
characterized by hazardous and significant depths and velocities."
P.O. Box 260595
Lakewood, CO 80226
' Lena Gulch Master Drainage Plan, Urban Drainage and Flood Control District, Cities of Golden, Voice:
Lakewood, & Wbeat Ridge, Jefferson County, Wright - McLaughlin Engineers, Denver, County, 303-989-1427
June 1975.
Fax:
303-988-9609
Email:
DTrieste@msn.com
Ideally, a "duplicate effective" model of the 100-yr WSEL should be constructed based
on the hydraulic data used in the Lena Gulch Master Drainage Plan. That data was
searched at Urban Drainage and Flood Control District (UDFCD) library, and also at
McLaughlin Water Engineers (previously, Wright-McLaughlin Engineers)who
performed the study; however, the hydraulic data could not be located. Because of that,
the 100-yr WSEL had to be constructed based on best available data. Such data includes
City of Wheat Ridge Aria] Photo with 2-foot contour intervals z, Lena Gulch Mater
Drainage Plan, and a site visit. It is important to note that because the original study was
performed over 25 years ago but the 100-yr WSEL was modeled based on recent
topography, it is difficult (if not impossible) to match the original study water surface
profile exactly. However, the duplicate effective WSEL matches that of the original
study (Figure 1 & Profile Output Table, Attachments) within a few tenths of a foot which
is very reasonable for the purpose of this study.
The study was performed by applying the state-of-the-art computer model, HEC-RAS 3,
which is the "next gen" HEC-2 model. A known downstream WSEL was input based on
the original study so that the effects of the downstream control (drop structure) located in
the channel at the time of the original study would not have to be modeled - the details of
that structure are not known and likely different of the existing structure. Model
generated printout of all input data is included with the Attachments.
A 100-yr discharge of 1,100 cfs was selected based on information from the Lena Gulch
Master Drainage Plan (Figure 4, Attachments). The 100-yr discharge used in performing
the original study was not know as explained above. However, 1,100 cfs is likely very
near the 100-yr discharge for the study reach per the Master Plan, and results in
reasonably duplicating the Master Plan 100-yr WSEL.
Floodway delineation was determined by separating channel flow from overbank flow
based on topography, and comparing discharge and velocity between overbank and
channel flow. The floodway is that section of the total cross-section carrying the
majority of flow and highest velocity. Or per Wheat Ridge City Code as stated above.
Study Results
Figure 3 indicates the approximate extent and location of that section of the planned
residence to be constructed on piers. The majority of that section is located within the
100-yr floodplain. However, the floodway is about 35 ft from the outermost piers.
To illustrate the relation of the floodplain and floodway in more detail, please refer to the
attached cross-section plots for River Stations (RS) 9600, 9578, and 9556. Those
correspond to RS 96+00, 95+75, and 95+50, respectively from Figure 2. Each cross-
section plot indicates the location of the pier closest to the channel (note points A, B, &
C), and depth of flooding. In addition, the discharge and velocity are presented for the
main channel and overbank sections. For each cross-section plot, the main channel
z City of Wheat Ridge 1996 Aerial Mapping Project, Sheet M16.
3 US Army Corps of Engineers, Hydrologic Engineering Center, River Analysis System„ 1998.
(floodway) carries the "reasonable passage" of the 100-yr flood, and has "significant
depths and velocities." The overbank areas do not have significant depths and velocities,
and carry a minor portion of the 100-yr flood. The latter area is the floodway fringe and
it is within that area that Mr. Storrer's planned residence is to be located.
In addition, to further demonstrate that the planned residence will not be. subject to
dangerous floodflows (based on the 100-yr discharge), depths and velocities of that
portion of the residence within the 100-yr floodplain were compared to "Depth-Velocity-
Danger-Level criteria" per Bureau of Reclamation's Downstream Hazard Classification
Guidelines.4 Highest depth and velocity at the planned residence is 1.1 ft and 2.0 ft/s,
respectively at Station 96+00. Per Figure 2 of the Guidelines (attached), such a
combination of depth and velocity is clearly in the low-danger zone.
Figure 2 of the Guidelines pertains to houses on foundations, while the section of Mr.
Storrer's house under scrutiny will be built on piers. Although Figure 2 of the Guidelines
does not directly apply to a structure on piers, its application results in a degree of
conservatism. That is because a house built on a foundation is also subject to buoyant
forces in addition to greater hydrodynamic forces.
Thank you for your attention to this matter and review of this study. Please contact me if
you have any questions, or would like to meet to discuss this study in detail.
Respectfully submitted,
f6 -
_011 A
Douglas I Trieste, P.H.
Owner
Attachments
Cc: Mr. Lee Storrer
Mr. C~ralg Houdeshell, P.E.
;"&t ~ //-79-91
a Downstream Hazard Classification Guidelines, ACER TM-11, Bureau of Reclamation, Denver,
Colorado, 1988.
Attachments
Figures
Grass Line
ROW width
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7
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-
100 Year Flood Plain Urnit
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r hnproued Ctxuriel CaMifpra
7
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.TS
Typical Exisnly C:onre Cross Section
"
'
Sta. 95•CC •o IZZ-00 Scale 1
=20
Gross Lined Charnel
ROW width 100'
-Y
5480
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4Ogyr. Water Sarface
Typical Improved Channel Cross Section _
Sta.10.00 to 49.00 58.00 to 95.00 Scalel•=10'
4.4'
100 c water Surface
L- r
4(IyP.) 4
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e ~.w w/Minter rErosion G
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NOTE: Fu Existing 100 Year Dischage .
_
ma ether flows. see Mosier Plan Report.
Pond
Line
50
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IOd Year Surfu eP ik_
water
+~ff
s-CC 95.00 I 100.00
4 + a_-ws emuL AnwErs ra:•' cESVUEO.y miE- ✓a/9s ENGINEER,
A RAL R<L,y 11C a1t:. dF DATE' 5 ~ ~5
t~oPacnAwc .,~„F inns A asntt5 WRIGHT-MCLAUGHLIN ENGINEERS
CHECKED, y/LJ
•?a. - e-r n.wq-t9- GATE- 59 y„a
1II-1-_1-I--IIII i 11
105.00 110.00
URBAN DRAINAGE AND FLOOD CONTROL DISTRICT
Sto. 92•00 to Sta. 95.00 Sta. 95.00 b Sta. 107.00 Sta. 107°00 to Sta. 122.00
Design CLSCimge =2450 cfs Design DisUargs = 2000 ifs Design Discharge =1500 Cfs
man Chanel Mm Chat Main Chamel
Average kbCdY =7.6 fps Average Veb-ary =7.5 fps Average telocay =8.0 fps
z
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115.00 . 120.00 _ 122.00
MASTER PLANNING SHEET NO.
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100 Yes LAW Chanel -Ndwol Slope n=.02
100 Year Greer Lind CMwanl-Flat Slope n=.03
100 Year Existing Cle
25 rier Grass Lind Chernm-Fbt Slope n=.03
_ 100 Yes Existing Development and Cho"
NOTE: All flows bosed on aseunwd future
denelopvant except where noted.
10 Year Gross Lined Cbasbal-Flat Slope n=.03
25 Year Existing Chernel
10 Yes Existing Channel k
100 Yew wft DelerGin Naaarran and naened Meals Gran PA"rvoW Stun" 105
100 Yes Moslar Plan Chom al k
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LENA GULCH -PEAK DISCHARGE PROFILE
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45000 - 42000 39000 ZOLWJ/ 33LRA7 4w cru .I
(APEX GULCH) Olstarloe in Feet from confkhence wf Clear Creek
124Q0 AL[:oTT 151.
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Plan: Duplicate Ef River: Lena Gulch Reach: Lee Stoner Riv Sta: 9600 Profile: PF 1
E.G. Elev (ft)
5446.731 Element
Left OB
Channel
Ri ht OB
Val Head (ft)
0.35; Wt. n-Val.
0.035'.
0.030
0 035
W.S. Elev (ft)
5446.38 Reach Len. ft)
22.00.
22,00:
.
2200,
iant W.S. (ft)
Flow Area sq ft
70 501
189.95'.
0.461
E.G. Slope (ft/ft)
0.001741 Area (sq ft)
70.50 i
18995;
046
Q Total (cfs)
1100.001 Flow (cfs)
139.99
959.85
016
jTop Width (ft)
112.621 Top Width (ft)
59.37;
48.00.
524
Val Total (ft/s)
4.221 Avg. Val. (ft/ s)
1,99!
5.05'..
0.35
I Max Chi Dpth (ft)
6.271 H dr. Depth (ft)
1.191
3.96;
009i
Conv. Total (cfs)
26360.5. Conv. cfs)
3354.6
23002.0
3.81
Length Wtd. (ft)
22.00 Wetted Per. (ft)
59.42
49.69 i
5.25
Min Ch El (ft)
5440.101 Shear (Ib/s ft)
0.131
0.42
0.01
Alpha
1.261 Stream Power (lb/ft s)
0.26
2.10'
0.00
Frctn Loss (ft)
- 0.04 Cum Volume (acre-ft)
0.16
0.411
0.021
C & E Loss (ft)
0.00 Cum SA (acres)
0.17
01101
0.041
Plan nunlirota Ff River I enn Gulrh Reach-l ee Stnrfer Riv Sta 9578 ` Profile' PF 1
E.G. Elev (ft)
5446.691
Element
Left OB
1
Channel
Ri ht OB
Vei Head (ft)
0.39
Wt. n-Val.
0.035
0.030
0.035
W.S. Elev (ft)
5446.30
Reach Len. ft
22.00
22.001
22.001
Cnt W.S. (R)
Flow Area (sq ft)
71.20
181.21
2.23
E.G. Slope (ft/ft)
0.001829
Area s ft
71.20
181.21
2.23
Q Total (oft)
1100.00
Flow cfs
138.98
959.69
1.34
Top Width (ft)
119.69
Top Width ft
63.82
44.00
11.78'
Val Total (ft/s)
4.32
Avg. Val. ft/s)
1.95
5.30
0.60
Max Chi Opth (ft)
6.38
H dr. Depth ft
1.12
4.12
0.191
Conv. Total (cfs)
25723.1
Conv. (cfs
3249.9
22442.0
31.2
Length WWI. (ft)
22.00
Wetted Per. ft
63.86
45.83
11.79
Min Ch El (ft) -
5439.92
Shear Ib/sq ft)
0.13
0.45
0.02
Alpha
1.34
Stream Power (lb/ft s
025
2.39
001
Frch1 Loss (ft)
0.04
Cum Volume (acre-ft)
0.13
0.32
0.01
C& E Loss (ft)
0.00
Cum SA acres
0.14
0.07
0.04
Plan nunlirate Ff River I ena Gulch ReaclcLee Storrer Riv Sta: 9556.' Profile: PF 1
E.G.Elev (ft) -
5446.64
Element
Left OB
Channel
Ri ht OB
Val Head (ft)
0.43
Wt: n-Val.
0.035
0.030
0.035
W.S. Elev (It)':.
5446.21
Reach Len. (ft)
22.00
22.00
- 22.00
Clit W& (ft)
Flow Area (sq ft
71.56
171.47
5.23
E.G. Slope (fbtlt)
0.001953
Area (sq ft
71.56
171.47
5,231
Q Total (cfs)-:'
1100.00
Flow cfs
137.65
958.11
1
4.25
Top Width (ft).
127.21
To Width (ft)
68.89
40.00
18.32
Val Total (ft(s)
4.43
Av Val, ft/s
1 92
5.59
0.81
Max Chi Dpth (ft)
6.47
H dr. Depth (ft)
1.04
4.29
0.29
Conv: Total(cfs) -
24891.7
Conv.. cfs
3114.8
21680.8
96.1
Length Wtd. (ft)
22.00
Wetted Per. (ft)
- 68.92
42.04
18.33
Min Ch El (ft)
5439.74
Shear. Ib/ ft
0.13
0.50
0.03
Alpha
1.41
Stream Power (lb/ft 5
0.24
2.78
0.03
Fretrl Loss (ft) G
0.04
Om Volume (acre-ft
0.09
0.23
0.01
C & E Loss (ft)'
0.01
1
Cum SA (acres) -
0.10
0.05
0.03
Cross-section Plots
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FEDERAL EMERGENCY MANAGEMENT AGENCY O.M.B. No. 3067-0077
NATIONAL FLOOD INSURANCE PROGRAM Expires July 31, 2002
ELEVATION CERTIFICATE
Important: Read the instructions on pa es 4 - 7.
SECTION A - PROPERTY OWNER INFORMATION For Insurance Company Use:
ILDING STREET ADDRESS (Including Apt, Unit, Suite, and/or Bldg. No.) OR P.O. ROUTE AND
Wheat Ridqe CO 80033
Lot 43 Applewood Village 2nd Filing Jefferson County Colorado'
BUILDING USE (e.g., Resldenhal, Non-reslden6al, Addltlon, Accessory, etc. Use a Comments area, If necessary.)
(XJ NAD 1927 I_] NAD 1983 U USGS Quad Map IX I
SECTION B - FLOOD INSURANCE RATE MAP (FIRM) INFORMATION
B1. NFIP COMMUNITY NAME & COMMUNITY NUMBER
B2. COUNTY NAME -
B3. STATE
Jefferscrt
GD
B4. MAP AND PANEL
B5. SUFFIX
B6. FIRM INDEX
67. FIRM PANEL
88. FLOOD
89. BASE FLOOD ELEVATION(S)
NUMBER
DATE
EFFECTIVE/REVISED DATE
ZONE(Sj
(Zone AO, use depth of Flooding)
rxtFrrm txn~
O
M~r~, 1g72
F~h_ 4. 19FR
A-1
5443.4
B10. Indicate the source of the Base Flood Elevation (BFE) data or base flood depth entered in B9.
_J FIS Profile IX II, FIRM I-I Community Determined I I Other (Describe):
J NGVD 1929 I_I NAVD 1988 I_I Other (Describe): _
611 _ Indicate the elevation datum used for the BFE in B9: IX
B12_ Is the building located in a Coastal Barrier Resources System (CBRS) area or Otherwise Protected Area (OPA)?
Designation
1_1 Yes I_1 No
SECTION C - BUILDING ELEVATION INFORMATION (SURVEY REQUIRED)
C1. Building elevations are based on: I_fConstruction Drawings` I_IBuilding Under Construction' IX (Finished Construction
'A new Elevation Certificate will be required when construction of the building is complete.
C2. Building Diagram Number _ (Select the building diagram most similar to the building for which this certificate is being completed - see
pages 6 and T. If no diagram accurately represents the building, provide a sketch or photograph.)
C3. Elevations - Zones Al-A30, AE, AH, A (with BFE), VE, V1-V30, V (with BFE), AR, AR/A, AR/AE, AR/A1-A30, AR/AH, AR/AO
Complete Items C3.a-i below according to the building diagram specified in Item C2. State the datum used. If the datum is different from
the datum used for the BFE in Section B, convert the datum to that used for the BFE. Show field measurements and datum conversion
calculation. Use the space provided or the Comments area of Section D or Section G, as appropriate, to document the datum conversion.
Datum _ Conversion/Comments
Elevation reference mark used Does the elevation reference mark used appear on the FIRM? I_I Yes ~r I No
Q a) Top of bottom floor (including basement or enclosure)
5446
.5
ft.(m)
v
O b) Top of next higher floor
5456
5
ft.(m)
a
❑ c) Bottom of lowest horizontal structural member (V zones only)
ft.(m)
w R
O d) Attached garage (top of slab)
5444
fL(m)
°
a
e
-
t1 e) Lowest elevation of machinery and/or equipment
m
servicing the building (Describe in a Comments area.)
N''A
_
ft.(m)
E c
p f) Lowest adjacent (finished) grade (LAG)
542
.5 _
ft-(m)
z a
®B
~
• g) Highest adjacent (finished) grade (HAG)
5444
.0
ft.(m)
~
IOL
. .
a h) No. of permanent openings (flood vents) within t ft. above adjacen
t grade
0 i) Total area of all permanent openings (flood vents) in C3.h 1960 sq. in. (sq. cm) (1960
SECTION D - SURVEYOR, ENGINEER, OR ARCHITECT CERTIFICATION
This certification is to be signed and sealed by a land surveyor, engineer, or architect authorized by law to certify elevation information.
I certify that the information in Sections A, B, and C on this certificate represents my best efforts to interpret the data available.
I understand that any false statementmay be punishable by fine orimprisonment under 18 U.S. Code. Section 1001.
& Associates, Inc
3-6036
FFprtA Gnrm At_4t III nn CFF PPx/PP.CF CIr1F POP (:r)NTINI IATInN PPPl Ar1PC AI I PPPVI(lI IC P:nITIr1NF
IMPORTANT: In these spaces, copy the corresponding information from Section A. ~ For Insurance Company Use:
CITY Wheat Ridge STATE CO'i ZIP CODE I Company NAIC Number
80033
SECTION D - SURVEYOR, ENGINEER, OR ARCHITECT CERTIFICATION (CONTINUED)
Copy both sides of this Elevation Certificate for (1) community official, (2) insurance agent/company, and (3) building owner.
1_1 Check here if attachments
SECTION E - BUILDING ELEVATION INFORMATION (SURVEY NOT REQUIRED) FOR ZONE AO AND ZONE A (WITHOUT BFE)
For Zone AO and Zone A (without BFE), complete Items Et. through E4. If the Elevation Certificate is intended for use as supporting
information for a LOMA or LOMR-F, Section C must be completed.
Et. Building Diagram Number _ (Select the building diagram most similar to the building for which this certificate is being completed -
see pages 6 and T. If no diagram accurately represents the building, provide a sketch or photograph.) -
E2. The top of the bottom floor (including basement or enclosure) of the building is I_I_I ft.(m) 1-1Jin.(cm) 1_1 above or 1_1 below
(check one) the highest adjacent grade. (Use natural grade, if available.)
E3. For Building Diagrams 6-8 with openings (see page 7), the next higher floor or elevated floor (elevation b) of the building is
1J-1 ft.(m) 1J-Iin.(cm) above the highest adjacent grade. Complete Items C3.h and C3.i on front of form.
E4. For Zone AO only. If no flood depth number is available, is the top of the bottom floor elevated in. accordance with the community's
floodplain management ordinance? 1-1 Yes 1_1 No 1_ Unknown. The local official must certify this information in Section G.
SECTION F - PROPERTY OWNER (OR OWNER'S REPRESENTATIVE) CERTIFICATION
The property owner or owner's authorized representative who completes Sections A, B, C (Items C3.h and C3.i only), and E for Zone A
(without a FEMA-issued or community-issued BFE) or Zone AO must sign here. The statements in Sections A, 8, C, and E are correct to
the best of my knowledge.
PROPERTY OWNER'S OR OWNER'S AUTHORIZED REPRESENTATIVE'S NAME
ADDRESS CITY STATE ZIP CODE
SIGNATURE DATE TELEPHONE
COMMENTS
Check here if attachments
SECTION G -COMMUNITY INFORMATION (OPTIONAL)
The local official who is authorized by law or ordinance to administer the community's floodplain management ordinance can complete
Sections A, B, C (or E), and G of this Elevation Certificate. Complete the applicable item(s) and sign below.
Gt. 1-1 The information in Section C was taken from other documentation that has been signed and embossed by a licensed surveyor,
engineer, or architect who is authorized by state or local law to certify elevation information. (Indicate the source and date of the
elevation data in the Comments area below.)
G2. 1_1 A community official completed Section E for a building located in Zone A (without a FEMA-issued or community-issued BFE) or
Zone AO.
G3. 1_1 The following information (Items G4-Gg) is provided for community floodplain management purposes.
G7. This permit has been issued for: I_I New Construction 1-1 Substantial Improvement
G8. Elevation of as-built lowest floor (including basement) of the building is: _ft.(m)Datum:
G9. BFE or (in Zone AO) depth of flooding at the building site is: _ft.(m)Datum:
LOCAL OFFICIAL'S NAME - TITLE
COMMUNITY NAME TELEPHONE
DATE
1-1 Check here if attachments
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