Item 5 - Response to Public re: Drainage Improvements Poway Library Site
AGENDA.REPORTSUMMARY -
TO: "",.b1. ''Y'' ',d .....'~h. "t, ,,","
FROM: James L. Bowersox, City Man ^
~ John D. Fitch, Assistant City Manage~)t ~
iNITIATED BY:
Mark S. Weston, Director of Engineerin servic~
J. Bradley Kutzner, Senior Civil Engineer
DATE: November 14, 1995
SUBJECT: Response to Public Oral Communications Regarding Drainage Improvements
for Poway Library Site
ABSTRACT
On October 17, 1995, Ms. Susan Sheldon requested the City Council reconsider the
drainage improvements for the Poway library site. On May 23, staff presented four
alternatives for drainage improvements for Rattlesnake Creek Across the Poway library
site. City Council selected Alternative "D" which included a concrete box culvert from
Poway Road to the future extension of Tarascan Road and then a naturalized open channel
from the western side of Tarascan Road extension to connect with the open channel
improvements at Community Park.
These improvements flood proof the library site and allow for the least costly
extension of Tarascan Road. In addition, these improvements allow for the creation of
more usable land for outside reading and seating around the library site.
-
ENVIRONMENTAL REVIEW
Additional environmental review will be completed with the site development plans.
FISCAL IMPACT
Flood proofing the library site will total $910,000 as presented to Council on May 23,
1995'(Attachment 3).
ADDITIONAL PUBLIC NOTIFICATION AND CORRESPONDENCE
Susan Sheldon, Library Advisory Committee, Friends of the Library
RECOMMENDATION
It is recommended that the City Council receive and file this report.
, ACTION
1 of 13 NOV 1 4 1995 ITEU5
,- --~~-
! AGENDA REPOR'!
CITY OF POW A Y
TO: .".,.b1. '"'' .,d "'b"~h' Clty C",,'1
FROM: James L. Bowersox, City Ma
INITIATED BY: John D. Fitch, Assistant Cit Manager~\~ ~
Mark S. Weston, Director of Engineerin Service~
J. Bradley Kutzner, Senior Civil Engineer
DATE: November 14, 1995
SUBJECT: Response to Public Oral Communications Regarding Drainage
Improvements for Poway Library Site
BACKGROUND
On October 17, 1995, Ms. Susan Sheldon requested the City Council reconsider
the drainage improvements for the Poway library site. On May 23, 1995, staff
presented four alternatives for drainage improvements for Rattlesnake Creek
across the Poway library site. City Council selected Alternative "D" which
included a concrete box culvert from Poway Road to the future extension of
Tarascan Road and then a naturalized open channel from the western side of
Tarascan Road extension to connect with the open channel improvements at
Community Park. The initial cost of the improvements for this alternative was
higher than a. naturalized or grass lined channel; however, the future cost of
bridging Rattlesnake Creek demonstrated that constructing a box culvert
initially would result in a lower total construction cost.
The design of the drainage improvements at the Poway library site include
diverting overland flood waters that could cross Poway Road back to
Rattlesnake Creek at the library site. To accomplish this diversion, the
City's consultant engineers and library architects have developed a conceptual
-plan as shown in Attachments 1 and 2. This concept includes constructing a
runoff swale with the landscaping of the library which collects overland flow
north of the library buildings. The runoff swale would collect the water and
direct it to a low point in which the architect envisions a low lying seating
area. Hidden grates would allow the water to be discharged back to the
concrete channel. Staff is working with the engineer and architect to
complete the design of the channel improvements. This alternative creates
more usable space on the library site for outside reading and seating areas.
ACTION:
2 of 13
,-" ,-
_. Agendll Report - D rl; Mge I ~rovements for PowIY Librlry Site
Nov_r 14, 1995
Plge 2
The extension of a covered concrete box culvert provides more usable space in
the vicinity of the library and allows for the future extension of Tarascan
Road at the least costly alternative. The intersection of Poway Road and
Tarascan Road is a signalized intersection. The extension of Tarascan Road to
Civic Center Drive will allow much improved traffic circulation to Community
Park, Valley School, and the Civic Center complex as well as the library.
Currently northbound traffic on Bowron Road is prohibited from making a left
turn onto Poway Road. This restriction requires vehicles to make a U-turn on
Poway Road to travel westbound or to travel to Community Road on Civic Center
Drive and make a left turn at Poway Road for travel westbound. The future
extension of Tarascan Road will enhance traffic circulation in this area.
The engineer and architect will be designing the creek channel improvements
west of Tarascan Road to compliment the grass lined area in Community Park.
The architect envisions a combination of natural area and turfed area to
provide an attractive, safe, and usable pedestrian link from Community Park to
the library complex.
FINDINGS
-
The combination of a covered concrete box culvert and an open channel are the
City Council adopted drainage improvements for Rattlesnake Creek across the
library site. These improvements flood proof the library site and allow for
the least costly extension of Tarascan Road while maintaining a more open and
natural linkage from the library site to Community Park. In addition, these
improvements allow for the creation of more usable land for outside reading
and seating around the library site.
ENVIRONMENTAL REVIEW
Additional environmental review will be completed with the site development
plans.
FISCAL IMPACT
Flood proofing the library site will total $910,000 as adopted by City Council
on Hay 23, 1995 (Attachment 3).
ADDITIONAL PUBLIC NOTIFICATION AND CORRESPONDENCE
Susan Sheldon, Library Advisory Committee, Friends of the Library.
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ITEM 5 .
3 of 13 NOV 1 4 1995
Agel'1dli Report .. Drlinage I~rov.."ts for PowlY Library Stte
November 14, 1995
Pl1il8 3
RECOMMENDATION
It is recommended that the City Council receive and file this report.
JLB:JDF:HSW:JBK:mh
Attachments:
1. Library site plan
2. Landscaped swale area
3. Agenda Report from May 23, 1995
e:\ctty\ag.ftda\11071tbr....
4 of 13 NOV 1 4 1995 ITEM 5
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ATTACHMENT 1
5 of 13 NOV 1 4 1995 ITEM 5
OCT 2S '95 Q3: 35PM CARDWELL THO~IAS P, 2/2
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A TT ACHMENT 2
6 of 13 NOV 14 1995 ITEM 5
AGEND......nr-')RT SUMMARY ~
TO: ..,."bl. '"'' "d .....,.~ Clt, C.",11
_ FROM: James L. Bowersox, City Mana
INITIATED BY: John D. Fitch, Assistant City anager~Pr .,
Mark S. Weston, Director of Engineerin ~s
J. Bradley Kutzner, Senior Civil Engineer I
DATE: May 23, 1995
SUBJECT: Drainage Improvements for the Poway Library Site
ABSTRACT
On February 16, 1995, the City Council selected a location for the Poway City Library
to be positioned along Poway Road on the library site property (Attachment 1). The
entire site is within the 100-year floodplain and a portion is within the 100 year
floodway of Rattlesnake Creek. To build on the site, the property has to be flood
proofed by elevating the building pads above the 100-year floodplain elevation and
constructing drainage improvements such that there is no additional flood impact to the
adjoining properties.
Staff and the City's consultants have analyzed four alternative channel improvements
for Rattlesnake Creek to flood proof the library site for development on both the north
and south portions of the property.
Staff recommends Alternate D - Combination Concrete Channel and Naturalized Channel
improvements.
ENVIRONMENTAL REVIEW
Additional environmental review will be completed with site development plans.
FISCAL IMPACT
Flood proofing the library site will total $910,000 with Alternative D.
ADDITIONAL PUBLIC NOTIFICATION AND CORRESPONDENCE
Standard distribution. ~ copy of this report is being mailed to the Library Advisory
Commi ttee.
RECOMMENDATION
It is recommended that the City Council adopt Alternative D as the preferred method to
flood proof the library site and direct staff to complete the environmental review and
site development process to implement this alternative creating a building site which
would allow building development on both north and south portions of the library site.
ACTION Approved staff recommendation, 3-0. Councilmembers Callery and Rexford absent
(YJtL..;1..., t< / \J~ t...
MarJorie K. Wahlsten, City Clerk
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7 of 13 A TT ACH lENT 3 NaV 1 4 1995 ITEM .!
MAY 2 3 1995 ITEM 12
^_._"---,~ -.--
-.GENDA REPORT
CITY OF POW A Y
TO: Honorable Mayor and Members of the City Council
FRO"': James L. Bowersox, City Manager
INITIATED BY: John D. Fitch, Assistant City Manager
Mark S. Weston, Director of Engineering Services
J. Bradley Kutzner, Senior Civil Engineer
DATE: May 23, 1995
SUBJECT: Drainage Improvements for the Poway Library Site I
BACKGROUND
On February 16, 1995, the City Council selected a location for the Poway City I
Library to be positioned along Poway Road on the library site property
(Attachment 1). The entire site is within the 100-year floodplain and a
portion is within the 100 year floodway of Rattlesnake Creek. To build on
the site, the property has to be flood proofed by elevating the building pads
above the 100-year floodplain elevation and constructing drainage improvements
such that there is no additional flood impact to the adjoining properties.
The main channel of Rattlesnake Creek borders the northwest edge of the
1 ibrary site. The existing channel does not have the capacity to pass the
flood waters that can be delivered to the property by the existing storm
drainage facilities crossing Poway Road.
Staff has completed three studies relative to stream flood flows at the
library site based on various site development plans. The characteristics of
the upstream 100-year flood condition impacts proposed development on the
1 ibrary site. The existing flood control channel which originates at the
south edge of Hilleary Park and is located between Arikara and Wan est a has a
capacity of 2900 cfs. The 100-year flood flow at Hilleary Park is
approximately 3900 cfs. The difference, or 1000 cfs, would flow south of
Hilleary Park east of Wanesta across vacant land and commercial property north
of Poway Road in the vicinity of the Lively Center. The flows then travel
south along Bowron Road, and west along Civic Center Drive to rejoin the main
creek at Community Park. This side-channel flow which would occur during
maximum flood events was analyzed by staff and our consultants to determine
buildable areas on the site. The floodway of this eastern flow encroaches on
the southeast corner of the library site. The Council has selected the south
portion of the library as a potential commercial site. Staff has further
analyzed this development alternative as it relates to flood proofing the
site.
ACTION:
. J
..
8 of 13
NOV 1 4 1995
- Agenda FWpoIt . Drainage _ inti for !he I'oway UbraIy SIte
May 23. 1995
PoGe 2
Any site development of the library site will require constructing significant
-- drainage improvements on the west edge of the property along the existing
alignment of Rattlesnake Creek. The existing channel will not handle the
flood flows of Rattlesnake Creek delivered through the existing storm drain
system under Poway Road. Previous development plans have studied locating
both the library and the commercial site on the north half of the property
near Poway Road maintaining the existing floodway of the overflow channel
along Bowron Road to the east and Civic Center Drive to the south. By
locating a commercial site on the south half of the property, additional
analysis was made to assure that the property could be flood proofed. The
analysis studied four alternative channels for the main channel of Rattlesnake
Creek: Naturalized channel, grass-lined channel, concrete box and channel,
and a combination concrete channel with a concrete box and natural channel.
Our consultants developed both cost estimates for the four alternatives and a
qualitative evaluation for channel configurations. The results of the
analysis will be presented below. Developing the south portion of the library
site with a building is possible with no additional cost provided the set
backs from Bowron Road and Civic Center Drive used in the analysis are
observed.
FINDINGS
Staff and the City's consultants have analyzed four alternative channel
improvements for Rattlesnake Creek to flood proof the library site for
development on both the north and south portions of the property. Their
report presents the four channel configurations which are described as
follows:
Alternative A - Naturalized Channel: The naturalized channel would include an
open channel for Rattlesnake Creek approximately 50 feet wide at the bottom
and be revegetated with native species to create a riparian habitat similar to
Poway Creek behind Creekside Plaza. The channel would extend from Poway Road
to the connection in Community Park. The cost of the channel improvements
with property is about $565,000; however, should Tarascan be extended in the
future, the cost of a bridge crossing would increase the cost of the
'naturalized channel to $1,263,000. The bridge cost is approximately $700,000.
Alternative B - Grass-Lined Channel: This creek would result in a grass-lined
channel similar to the channel through Community Park extending from Poway
Road to the connection at Community Park. Channel improvements initially
would cost $590,000. However, if Tarascan is to be extended, the crossing of
the channel would cost approximately $700,000 with a total project cost of
$I, 293,000.
Alternative C - Concrete Box and Channel; This channel improvement would
include the construction of an enclosed reinforced concrete box across the
library site transitioning to an open concrete trapezoidal channel west of the
proposed Tarascan alignment to the connection at Community Park. The box
culvert would be covered and the land could be used over the concrete channel.
The cost of this alternative is $750,000 with the box serving as the bridge
structure should Tarascan be extended to the south. No additional costs would
be assigned for the bridge crossing. In addition, more land is usable by the
. library with this alternative.
~
NOV 14 1995 ITEM 5
9 of 13
.IG- Roport . er.inag, lfD'0 onto for tile -V Ub'"'Y SIte
May 23, 1995
PIg. 3
Alternative D - Combination Concrete Box and Natural Channel: This
alternative is a combination of constructing a reinforced concrete box from
Poway road to west of the Tarascan extension. From Tarascan to the community
Park the channel would be constructed as a naturalized channel similar to
Alternative A. The cost of this alternative is $910,000 with no future cost
for bridge construction at Tarascan road.
The qualitative matrix of the alternatives was also prepared rating usable
area, flood protection aesthetics, wetland impacts, future roadway extension,
and O&M costs. This analysis suggests that the naturalized channel or the
combination reinforced concrete box and naturalized channel are equal
qualitatively. Attachment 2 presents both the quantitative and qualitative
matrix developed in the Library Site Flood Protection Alternatives Report.
Staff recommends Alternate D - Combination Concrete Channel and Naturalized
Channel improvements (see Attachment 3).
ENVIRONMENTAL REVIEW
Additional environmental review will be completed with site development plans.
FISCAL IMPACT
Flood proofing the library site will total $910,000 with Alternative D.
ADDITIONAL PUBLIC NOTIFICATION AND CORRESPONDENCE
Standard distribution.
RECOMMENDATION
, It is recommended that the City Council adopt Alternative D as the preferred
method to flood proof the library site and direct staff to complete the
environmental review and site development process to implement this
alternative creating a building site which would allow building development on
both north and south portions of the library site.
JLB:JDF:MSW:JBK:mh
Attachments: 1. Vicinity Hap
2. Rattlesnake Creek Flood Protection Matrices
3. Alternative D
10 of 13 NOV 14 1995 ITEM 5
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AT T A C H MEN T 1 NOV 1 4 1995 ITEM 5
,
RA TTLESNAKE ...h_cK FLOOD PROTECT10l'. ,vi.., RICES -
LIBRARY SITE. POW A Y
QUANT1T A TIVE MA TRIX
I CC<AW,ELI T ARASCAN ~ LAND J TOT AL uSE ABLE VALUE OF ,
I
AL TERN'; 7 I VE i COS T CROSS I NO OST( OFFS I iE cas i ACRES EXCESS LANO!
A (NAiURALlZED) I $516.000 I $700.000 I $ 51. 000 Is 1.263. 000: 4_ 5 0 i
, I $542. 000 I $700. 000 Is 1. 293. 000 I I
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a :, GRASS) S 51. 000 4_ 5 0 I
C 'CONC?EiE \ I $709,000 I - $ 42,000 Is 751. 000 5_ 3 15400:col
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o : :OMBINAiION)1 $858.000 I - $ S1. 000 1$ 909, 000 4. 8 S: 50. ceol
QUALlT A TIVE MATRIX
r~,- ~~~~ir T [IE I U;~~~LElp~~~~~T IWEiLANDS!ROADWAY o & u iOHL
AESiHEi [CS! [UPICiS DiENSiON COSiS . SCCR::
I A \ NA rURAL I ZED) 1 ! I I ,
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DEF] N] T I 0~IS
USoABLE AREA - LAND AVAILABLE ON LIBRARY SITE FOR RANKING ~CQRE
OVERFLOW PARKING FOR LIBRARY OR COMMUNITY PARK_ l=MOST DESIRABL::
2=LEAST DESIRA2L::
FLOOD PROTECTION - EXTENT TO MOICH FLOOD PROTECTION PROVIDED.
AESTHETICS - VISUAL !MPACT OF PROPOSED CHANNEL IMPROVMENTS.
'NE-LANDS iMPACTS - EXTENT TO WHICH wE'LAND ARE\ IN CREE~ IS
LIKELY TO BE DEGRADED( l=LE,\ST, 4 = MOST).
ROADWAY EXTENSION COSTS - COST IWPACTS & FEASIBILITY OF CONTRUCTING
THE TARASCAN ExTENSION_
O&M :OSTS - RANKING OF MAINTENANCE COSTS OF EACH ALTERNATIVE
(I=LEAST COSTLY, 4=NOSi COSTLY).
UNO VALUE - S1.S0/S0UARE FOOT FOR FLOODWAY lAND 'MliH ~OST OF THE LAND BEING EX:STINC:FEE,
: ;c.TE: COS7 OF TARASCAN ROAD iMF~ovEMENiS WOULD BE ::aUAL
~ap ALL AL7~~NATlvES i~:S COST IS NOT INCL~DEC
!N "IAL!S:o.
12 of 13 ATTACHMENT NOV 14 1995 ITEM 5 ,
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AT T A C H MEN T 3 HOV 14 1995 ITEM 5
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DiSTR~ BUTED ijT7o_ ~A' /,4 /Y7~
CITY OF POWAYLIBRARY ADVISORYCOb-f1UITTEE
November 14, 1995 RECEIVED
NOV 1 4 1995
CITY OF POWAY
CITY CLERK'S OFFICE
Honorable Mayor and City Council Members,
The Library Advisory Committee met on November 2, 1995, and Sue Sheldon's
request for revisiting the issue of Rattlesnake Creek was discussed. Our committee
agreed that the recommendation made in December of 1994 was still our opinion.
That recommendation read in part: "that the library be situated alone on the site
in a park-like setting with a natural channel".
Sincerely,
~~
Joye Davisson, Chair
NaV 14 1995 ITEM 5
-
DiSTRIBUTED ~'~,.
;. If-}>~
TO: MAYOR DON HIGGINSON AND CITY COUNCIL MEMBERS
FROM: JOYE DAVISSON, PRESIDENT ~
FRIENDS OF THE POW A Y LIBRARY
DATE: November 14, 1995 RECEIVED
\
RE: Ri\ TTLESNAKE CREEK NOV 1 4 1995
CITY OF POWAY
CITY CLERK'S OFFICE
On December 8, 1994, the Friends of the Poway Library Board of Directors
passed a motion regarding the new Poway Library site, Our recommendations
were presented to City Council on December 13th. In part that recommendation
read: "TR<\. T RATTLESNAKE CREEK BE MAI~T AINED AS A
NATUR<\.L RIPARIAN HABITAT."
At the Friends' Board meeting on November 9, 1995, the City Council report
for the November 14, 1995, Council meeting regarding Rattlesnake Creek was
discussed. The Board agreed that the motion passed on December 8, 1994, was
still the recommendation of our group_
-
NOV 14 1995 ITEM 5
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November 14, 1994
RECEIVED
Members of the Poway City Council
Poway City Hall NOV 1 .11995
13325 Civic Center Drive CITY OF POWAY
Poway, CA 92064 CITY CLERK'S OFFiCe
Atten: All Poway City Council Members
RE: Rattlesnake Creek construction project near library
Dear Council Members:
My wife and I have been residents of Poway for about 7 years. We
are extremely concerned about the proposed action to cover a
portion of Rattlesnake Creek near the new library site.
We live in an age when environmental concerns seem to often lose
out to the price of progress. A creek is a very special thing and is not
only habitat but a necessity to many life forms. The erection of any
type of enclosure of this stream would not only create irreparable
loss to wildlife but we would also lose the aesthetics of this natural
feature that many citizens of Poway now and could enjoy in the
future. Once enclosed it will probably be many decades before some
other council recognizes its value and spends the necessary money to
undo this proposed act. With the establishment of the new library,
what better way to promote environmental understanding than to
have a beautiful wild creek nearby in lieu of additional black topping
and concrete?
We oppose the construction and hope that you will reconsider the
decision to move forward to "burying" this creek. We are not
members of any group but felt our concerns needed to be voiced.
Very trUlY) yours, .
~ ., /21/
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arudf'k[ Carol alh(gher
13992 Arbolit, s Dr.
Poway, CA
486-3724
NOV 14 1995 ITEM .5, J~I ~
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