HomeMy WebLinkAbout07/19/2011, C 15 - SILT REMOVAL - VARIOUS LOCATIONS, SPECIFICATION NO. 91065 � J
council July 19,2011
j acEnda PepoRt
C I TY O F SAN LU I S O B I S P O
FROM: Jay D. Walter, Director of Public Works 9W
Prepared By: Dan Van Beveren, Senior Civil Engineer
SUBJECT: SILT REMOVAL—VARIOUS LOCATIONS, SPECIFICATION NO. 91065
RECOMMENDATION
1. Approve plans and specifications for Silt Removal —Various Locations, Specification No.
91065.
2. Authorize staff to advertise for bids.
3. Authorize the City Manager to award the contract if the lowest responsible bid is within the
Engineer's Estimate of$150,000.
4. Approve the transfer of approved project budget from the Master Silt Removal account to the
projects account at time of contract award.
DISCUSSION
Background
The City's creeks contain locations where sediment collects over time and requires removal to
facilitate storm flow. This project consists of the removal of accumulated sediment from the
following three locations: 1) San Luis Obispo Creek at the Marsh Street Bridge, 2) Prefumo
Creek at Los Osos Valley Road, and 3) Prefumo Creek at Madonna Road. Sediment has
accumulated in these three locations over the past several years and needs to be removed in order
to restore drainage capacity.
San Luis Obispo Creek at the Marsh Street Bridge
The portion of San Luis Obispo Creek beneath the Marsh Street Bridge is a location where the
creek makes a gradual sweeping curve. During periods of heavy flow, sedimentation accumulates
along the inside of this curve. As a result, several feet of material has been deposited along the
western portion of the creek beneath the bridge. Sediment has routinely been removed from this
location every few years in order to maintain the capacity of the creek channel at this critical
location, which is prone to flooding during significant storm events. This sediment removal
work was last done in 2007.
Prefumo Creek at Los Osos Valley Road
The portion of Prefumo Creek between Los Osos Valley Road and Laguna Lake is a location
where the creek slope flattens and sediment accumulates as the water in the creek slows down
prior to entering Laguna Lake. Sedimentation has historically been removed from this location
every few years in order to maintain the capacity of the creek channel and to help prevent the
accumulated sediment from migrating into the lake. This sediment removal work was last done
in 2006.
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Silt Removal—Various Locations (91065) Page 2
Prefumo Creek at Madonna Road
Immediately downstream from Laguna Lake, Prefumo Creek crosses under Madonna Road and
continues in a southerly direction. The accumulation of sediment in this location now slows the
creek in low flow conditions. Standing water now remains for several weeks following each rain
event. The removal of sediment from this location will reduce the problem of standing water and
will restore the channel to its previous flow capacity. There are no records of silt removal work
previously being done at this location.
Regulatory Permitting
Due to the location of these projects within the creek system, work must be scheduled for the late
summer or early fall - the time of year when the water in the creeks is lowest, and when work can
be performed without impacting the flowing water within the creeks. As such, scheduling these
projects around this limited construction timeline requires advance planning in both the design
effort as well as the anticipated receipt of all necessary regulatory permits.
All three of these project locations require regulatory permits from the Army Corps of Engineers,
the California Department of Fish and Game and the Califomia Regional Water Quality Control
Board. As of July 1, 2011, only the Department of Fish and Game permit has been received, and
staff is currently awaiting receipt of the other two permits. The recommended action will allow
the project to be advertised now, and then awarded in the event that the necessary permits are
received by early September. If the permits are not received within this timeline; the project will
have to be postponed until 2012.
CONCURRENCES
The project is approved by the California Department of Fish and Game through its issuance of
the 2008 Streambed Alteration Agreement for routing creek maintenance. The Department has
been notified of the project, as required in the 2008 Agreement.
A Water Quality Certification from the California Regional Water Quality Control Board and a
Letter of Permission from the Army Corps of Engineers are currently pending.
The City's Community Development Department is scheduled to issue a Mitigated Negative
Declaration for this project during the week of July 11, 2011. Any mitigation measures identified
in this environmental document will be incorporated into the project specifications prior to
advertisement.
FISCAL IMPACT
The 2011-13 Financial Plan, Appendix B, page 3-185, identifies $250,000 of construction
funding in 2011-12. The source of these budgeted funds is the San Luis Obispo County Flood
Control and Water Conservation District Zone 9 program which oversees and provides funding for
flood control improvements located within the San Luis Obispo Creek watershed.
C15-2
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Silt Removal-Various Locations (91065) Page 3
The project budget is detailed in the following table.
Silt Removal Various Locations-Contruction Costs
LConstruction: -----_._ —.__.-.-- ---------.--..__{ $_1502000'
IConstruction Conti ngencies:
Total for Construction: -- _ { _$165,000
�Mic. Construction Costs (Printing, Materials Testing, Etc.) $5,000
Total Cost of Project — _— _ $17070001
'Available Balance in Silt Removal Master Account
--- -----..-. _ --- ----..------..-.---------- — -
Funding is currently located in the construction phase of the Silt Removal Master account (90581),
which has a balance of$298,900 as of July 1, 2011. Staff recommends transferring funds once the
bids are received and the project is awarded.
Fiscal Impact Summary
Bal. as of 7/1/11 Proposed Change
Silt Removal-Various Locations(91065) - 170,000 170,000
Master Silt Removal Account (90581) 298,900 128,900 (170,000)
Total 298,900 298,900 -
AVAILABLE FOR REVIEW IN THE COUNCIL OFFICE
Plans and Special Provisions for Silt Removal-Various Locations, Specification No. 91065.
T:\Council Agenda Reports\Public Works CARU.011\CIP\91065 Silt Removal - Various Locations\91065 E-Council Agenda Report - Silt Removal
Various Locations.doc
C15-3
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council memoizanbum
July 11,2011
TO: City Council
FROM: Jay D. Walter,Director of Public Works
VIA: Katie Lichtig,City Manager K
SUBJECT: RED FILE ITEM—Silt Removal Various Locations, Spec. No. 91065
The Council Agenda Report that was included in the Agenda packet for this item did not include a project
vicinity map. Please find the attached map. If you have questions,please contact Jay Walter, Director of
Public Works.
Attachment
Vicinity Map—Silt Removal Various Locations, Spec. No 91065
G:\Staff-Reports-Agendas-Minutes\-CCMemos\2011\91065 Red File-Vicinity Map.doc
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From: rschmidt@rain.org[SMTP:RSCHMIDT@RAIN.ORG] /? ! ITEM # Gy�"
Sent: Monday, July 18, 2011 10:18:37 AM DAT
To: Council, S1oCity
Subject: Item C-15 and Broad Street Culvert Needs Help Too
Auto forwarded by a Rule
Re: Item C-15 and Siltation of Broad Street Culvert
Dear Council Members:'
I read with interest the staff report on item C-15. which proposes to
spend $170, 000 on three silt removal projects, none of which appear to
be
needed for property protection or life safety.
According to the staff report, there is currently approximately
$300, 000
in the city's bank account available for silt removal.
So my question is why, given the availability of funds, does the city
not
remove silt from the Broad/Murray Old Garden Creek culvert and its
entrance and exit, where flood capacity is badly diminished by the
presence of extensive silt buildup?
In the case of this culvert, the urgency of action is underwritten by
the
fact that both property and life safety are endangered by the city's
inaction -- this is a flood prone neighborhood, and lack of culvert
capacity is the flood cause.
I have written about this matter so many times I find it incredible
that
the city remains obstinate in dealing with the matter. Last time I was
told the reason for inaction was financial, but with the current staff
report, that clearly is not the real reason, as there's plenty of money
for this little silt clearing project. The cost/benefit ratio of this
silt
removal would be far better than for any of the staff-proposed
projects.
I've enclosed photos from last fall to refresh your memory. The main
difference between then and now is that there's even more silt now than
then.
I request you direct staff to deal with the Broad/Murray culvert
cleaning
hard copy: small:
this season, before another winter' s storms arrive. a COUNCIL aCOO DIR
o CRY MGR o FIT DDR
Thank you. o ASST CM a FIRE CHIEF
a ATTORNEY o PW DIR
o CLERKIORIO a POLICECHIEF
Richard Schmidt a PIR aPARKS&RECDDR
a TRIBUNE a UTIL DIR
a NEWTNES a AR DIR
a SLO CRY NEWS o COUNCIL
Photo captions Q�GR
1. Exotic weed trees have been allowed to grow up within the creek flow
0 0
area, creating a massive barrier right in front of the culvert exit.
The
result is a root-infested silt-buildup several feet deep where
previously
there was year-round creek flow that provided plenty of exit capacity
for
the culvert. About a decade ago, the city promised regular maintenance
to
assure proper flood flow around the trees, but like so many city
promises,
this has not been fulfilled. The previous public works director agreed
the
trees, with their vigorous root systems and intrusion into the
floodway,
were the source of the siltation problem. (FYI: The area to the right
of
the trees, the mass of rubble covered with leaves, was previously part
of
the creek flow area. Now junk piles up between the flood wall and the
trees, and no effort is made to remove it. )
2. Gravel bar at culvert outlet blocks flow from the culvert. The weed
trees are to the left, just beyond the picture border. This pile of
gravel
and silt needs to be removed for proper function of the culvert in
flood
times.
3. As a result of obstruction of the culvert exit, silt has backed up
into
the culvert and fills nearly one third of its depth. Serious
neighborhood
flooding occurs when the culvert cannot carry flood water, and the
water
backs up and overflows into Broad Street at the culvert entry by the
Village. we are statistically overdue for such an event, so take no
comfort from the fact it hasn't occurred in a long time.
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