HomeMy WebLinkAbout08 - Morning Canyon Channel - Rivertech Agreement AmendmentAugust 27, 2002
CITY COUNCIL AGENDA
ITEM NO. 8
TO: Mayor and Members of the City Council
FROM: Public Works Department
SUBJECT: MORNING CANYON CHANNEL - AMENDMENT NO. 1 TO THE
PROFESSIONAL SERVICES AGREEMENT WITH RIVERTECH, INC.
RECOMMENDATION:
Approve Amendment No. 1 to the Professional Services Agreement with Rivertech,
Inc., of Laguna Hills, California, for $26,160 for supplemental tasks in conjunction with
the Morning Canyon Drainage Study and authorize the Mayor and City Clerk to execute
the Agreement.
DISCUSSION:
Morning Canyon runs within private property from the Pelican Hills Golf Course to the
Pacific Ocean. While the City does not have a maintenance easement in the channel,
General Services annually cleared the drainage course of growth and maintained a
clear natural channel for flood flows during the 1980's. In the early 1990's, this service
was stopped due to opposition by some of the property owners. Based on the dense
vegetation that now exists in the channel, much of it arundo bamboo, it has been some
time since any vegetation has been removed from the channel bottom.
In the 1990's, un- permitted grading and installation of improvements occurred in the
channel bottom.
The Pelican Hill Golf course, constructed in the mid -90's, resulted in continuous
irrigation runoff into Morning Canyon Channel. The runoff probably contains fertilizers
that have contributed to the rapid growth of arundo within the channel.
Morning Canyon Channel has a hydraulically steep slope. It appears that over the past
30 or so years, grazing activities have resulted in transport of significant amounts of
sediment into the channel resulting in deposition and sediment accumulation within
Morning Canyon Channel. Construction of the golf course has eliminated most of this
sediment transport into the channel. Storms have eroded this accumulated sediment
and recreated the deep channel incisions that existed prior to the grazing activities.
Some combination of these factors led to a slope failure on the west side of the channel
that affected two properties. These affected property owners have approached the City
for guidance in obtaining design approval for work within the channel to repair the
slope.
SUBJECT: MORNING CANYON CHANNEL - AMENDMENT NO. 1 TO THE PROFESSIONAL SERVICES AGREEMENT
WITH RIVERTECH, INC.
August 27, 2002
Page 2
While Morning Canyon Channel falls within private property' and the City is not
responsible for maintaining the channel, iit is appropriate for the City to guide the
corrective process and to prepare a master plan for drainage, restoration, and water
quality for this channel. On April 9, 2002, City Council approved an agreement with
Rivertech to develop the concept for rehabilitating the channel, formulate a plan to
implement corrective measures, perform a hydraulic and biological assessments of
Morning Canyon Channel, and provide recommendations to stabilize and restore the
channel. Based on their review of the drainage channel and a detailed analysis of the
hydraulics, Rivertech has developed recommendations for a two phase restoration
strategy to be implemented by the property owners along Morning Canyon Channel.
The first phase, to be implemented before the rainy season, would install rock structures
at two areas along the channel (601 Rockford Road /515 Rockford Place and 621
Rockford Road /528 Seaward Road) to control scour at the toe of the channel slope and
prevent slope failures this rainy season. Meetings have been held with the property
owners at these locations to review and discuss repair options.
Implementation of the second phase of the project would occur next year and would
initiate a comprehensive remediation of the channel from the Pelican Hill Golf Course to
Coast Highway. This phase may include:
• Clearing of dense vegetation in the channel bottom
• Removal of encroaching structures
• Installation of rock encased by wire mesh structures at four locations along the reach
• Replanting of the channel slopes along with appropriate irrigation systems
City Staff from Planning, Building, and Public Works Departments will conduct a meeting
on September 9d' at 6 pm in Council Chambers, with residents whose property extends
into Morning Canyon Channel to discuss a restoration strategy to be implemented by the
property owners.
City Staff believes this two- phased approach is a practical way to deal with the difficult
problems posed by the degraded condition of this reach of Morning Canyon Channel.
The process to mobilize the property owners to responsibly restore the channel that falls
within their property will entail a cooperative partnership between the City and the
property owners. While the financial burden of restoring the channel should legitimately
be bome by the property owners, the owners can reasonably expect the City to be the
coordinating agent for this reach of the channel.
The City currently holds a twenty -two foot wide easement along the property lines of the Cameo
Highlands properties from the golf course to Coast Highway. It is assumed that the original intent of this
easement was to enable the City to construct a subsurface drainage facility in the event that the golf
course property was developed as a residential tract in lieu of the current use. Staff believes that this
easement will not be needed in the future and would recommend that it be abandoned at some future
date.
SUBJECT: MORNING CANYON CHANNEL - AMENDMENT NO. t TO THE PROFESSIONAL SERVICES AGREEMENT
WITH RIVERTECH, INC.
August 27, 2002
Page 3
SCOPE OF SERVICES:
Staff recommends Rivertech's scope of services be expanded to assist City Staff to
actively move forward with a program to involve and educate Morning Canyon Channel
property owners about the channel restoration. Rivertech's new tasks include:
1. Extending the hydraulic analysis for the entire channel reach North of Coast
Highway (Additional work under Task 4)
2. Researching emergency permitting requirements (Task 5A)
3. Preparing preliminary drawings and construction cost estimates for Phase 1
emergency stabilization measures (Task 513)
4. Supplementing the final report to include the additional hydraulic analyses and
additional information coming out of the meetings with property owners and City
Staff (Additional work under Task 7)
5. Performing a hydraulic analysis and providing recommendations for a specific
slope repair proposed by the Wynkoop's civil engineer (Additional work under
Task 8)
6. Preparing exhibits and attending meetings with property owners to discuss
Phases 1 and 2 channel restoration recommendations. Responding to requests
by City Staff for research to questions raised by property owners, performing
supplemental hydraulic, biological, and other engineering analyses, and
preparing additional exhibits (Task 11)
Funds for this project are available in the Storm Drain Improvement Project Account No.
7012- C5100008.
Upon completion of the study and meetings with property owners, Staff will prepare a
report for Council that includes remediation options and potential funding mechanisms.
2
DEPARTMENT
ji, Director
Robert Stein, P.E.
Principle Civil Engineer
Attachment: Amendment No. 1
MORNING CANYON CHANNEL
AMENDMENT NO. 1
TO
PROFESSIONAL SERVICES AGREEMENT WITH. RIVERTECH, INC.
THIS AMENDMENT NO. 1 TO PROFESSIONAL SERVICES
AGREEMENT, entered into this day of
2002, by and
between the CITY OF NEWPORT BEACH, a municipal corporation, (hereinafter
referred to as "CITY ") and Rivertech, Inc., whose address is 2332 Mill Creek Drive,
Suite 210, Laguna Hills, California, 92653, (hereinafter referred to as "Consultant "), is
made with reference to the following:
RECITALS:
A. On April 9, 2002, CITY and CONSULTANT entered into a
Professional Services Agreement, hereinafter referred to as "AGREEMENT', for
engineering services for the Morning Canyon Drainage Study and Restoration Analysis,
hereinafter referred to as "PROJECT".
B. CITY desires to enter into this AMENDMENT NO. 1 to reflect
additional services not included in the AGREEMENT or prior AMENDMENTS and to
extend the term of the AGREEMENT to July 3, 2003.
C. CITY desires' to compensate CONSULTANT for additional
professional services needed for PROJECT.
D. CITY and CONSULTANT mutually desire to amend AGREEMENT,
hereinafter referred to as "AMENDMENT NO. 1," as provided here below.
NOW, THEREFORE, the parties hereto agree as follows:
1. CONSULTANT shall be compensated for services performed
pursuant to this AMENDMENT NO. 1 according to "Exhibit A" dated August 16, 2002
attached hereto.
2. Total additional compensation to CONSULTANT for services
performed pursuant to this AMENDMENT NO. 1 shall not exceed twenty -six
thousand, one hundred sixty and 001100 Dollars ($26,160.00).
3. The term of the AGREEMENT shall be extended to July 1, 2003.
4. Except as expressly modified herein, all other provisions, terms,
and covenants set forth in AGREEMENT shall remain unchanged and shall be in full
force and effect.
IN WITNESS WHEREOF, the parties hereto have executed this AMENDMENT
NO. 1 on the date first above written.
CITY OF NEWPORT BEACH,
A municipal corporation
BY:
APPROVED AS TO FORM: Mayor
City of Newport Beach
By:
City Attorney
ATTEST:
LaVonne Harkless
City Clerk
Rivertech, Inc.
92
f :\userstpbwlsharedtagreements\fy 02- Mivertech - morning canyon - amendment no.. t.doc
EXHIBIT A
August 16, 2002
Mr. Bob Stein
Principal Civil Engineer
City of Newport Beach
Public Works Department
P.O. Box 1768
Newport Beach, California 92658 -8915
RE: Revised (August 16, 2002) Proposal for analyzing, remediating, restoring and
stabilizing Morning Canyon.
Dear Mr. Stein:
Based on your advice we have revised our proposal submitted to you on July 19, 2002. This
proposal includes the tasks proposed by LSA Associates and Rivertech Inc. For your
convenience I have attached a copy of the revised proposal by LSA. Our revised proposal
includes the tasks described in Rivertech Inc.'s proposal dated July 19, 2002 in addition to the
new tasks related to the design of all stabilizers.
PROPOSED SCOPE OF WORK
Task 1- Perform Site Reconnaissance Survey and Obtain Baseline Data
Members of the Study Team will observe the site and obtain onsite information. If possible,
we propose that during the site reconnaissance survey you observe the site jointly with us. To
compare the existing failed condition to the original condition we will bring copies of the
historic pictures for Morning Canyon with us. (This task has been completed)
Task 2 — Perform Hydrologic Analysis
We have both the electronic files (AES Files) and hard copies of the hydrologic analysis in
our office for Basins P 1 and P3. The analysis has been performed for the return periods of 2,
10, 25 and 100 years. We will route the outflow hydrographs from each basin to the outlet of
the 42 -inch storm drain to obtain the hydrographs for the Study Reach (This task has been
completed).
Task 3 — Develop Conceptual Alternative Restoration Plans and Select the Most Preferred
Alternative
We will develop a minimum of three conceptual alternative restoration plans. In developing
these concept plans we will coordinate closely with you to ensure the concept plans are
viable and meet with your approval. It should be mentioned that the restoration plans most
probably would be different than the condition, which had existed prior to the slope failure
and vegetation growth. This is because once the mechanics of an alluvial stream has been
disturbed it is difficult to bring it back to its natural condition. Even if that were possible,
time is required before the system heals. Until the system recovers it may be subject to failure
again. Therefore, in developing alternative plans we will focus on the stability of Morning
Canyon both during short and long -term periods (This task has been completed).
Task 4 — Perform Hydraulic Analysis
To hydraulically analyze the Study Reach in its existing failed condition cross - section survey
data are required. We will utilize the topographic map, which has been provided by you and
is prepared in July of 1999. Using the U.S. Army Corps of Engineers HEC -RAS Model two
conditions will be hydraulically analyzed. The two conditions are:
• Post - failure Condition, and
• Corrected Condition
In our original proposal dated February 20, 2002 we had identified the Study Reach to be
from the confluence of Morning Canyon with the 51 -inch storm drain downstream to the
Pacific Coast Highway (PCH). After observing the field conditions on two occasions we have
discovered that the stream instability has progressed upstream to Basin P3 at the Golf Course.
Therefore, we are proposing the Study Reach to be extended and should be from the outlet of
Basin P3 to PCH
Water surface profiles as well as other hydraulic parameters such as depth and velocity will
be calculated along the Study Reach corresponding to the Return Periods of 2, 10, 25 and 100
years. Calculation of hydraulic parameters for higher frequency events such as 2 years is
important because they represent the channel forming discharge (This task has been
completed)
Task 5 — Design Emergency Stabilization Measures
During our two field observations we have identified a significant headcutting downstream of
the 42 -inch storm drain. If emergency stabilization measures before the upcoming wet season
are not constructed, the headcutting may progress upstream with concomitant slope failures
along the residential units. In addition, due to meandering effect of the stream the toe of the
slope along the residential unit located at 603 Rockford Road (Mr. Christopher Wynkoop's
property) is subject to scour. This may cause a second slope failure along this property.
Therefore, we recommend the City of Newport Beach select the emergency stabilization
measures along Morning Canyon as an Immediate Action Project. Under this task Rivertech
will perform the following services:
Task 5A — Coordinate with the Federal Emergency Management Agency (FEMA)
We will obtain the name and phone number of the FEMA representative who authorizes
the emergency remedial measures. We propose that it would be more effective if you
could communicate directly with that representative. However, we would be available to
assist you on an as needed basis. Our services may include a site observation and
explanation of the mechanics of the Morning Canyon to the representative of FEMA. (We
now understand that FEMA was involved in such emergency type projects during the
El Nino years. Through FEMA this option is no longer available. I had
communications with the County of (Orange and the U.S. Army Corps of Engineers
about this matter and have provided a copy of that information to you. Further
investigation is being conducted by LSA)
Task 5B — Perform Hydraulic Design of Emergency Grade Stabilizer and Barbs and
Estimate their Construction Costs
Prior to any design services we request that you provide us with field survey data at the
headcutting and stream geometry at 603 Rockford Road. The survey should include the
height and dimensions of the concrete structure supporting the existing storm drain at 603
Rockford Road. After receiving the survey data we will hydraulically design one grade
stabilizer at the existing headcutting and two barbs at the residential unit of 603 Rockford
Road. The material for these structures will consist of riprap. The design will include the
dimensions of the structures, their locations, gradation of rock and its thickness. In
addition, we will estimate the approximate construction costs of the grade stabilizer and
the barbs. Preparation of construction drawings, specifications, special provisions and bid
documents are beyond the scope of services of Rivertech. (We are unable to complete
this task until we receive survey data from you).
Task 5C — Coordinate with Civil and Geotechnical Engineers as Well as the Contractor
Related to the Emergency Work
We will review the construction drawings, communicate with the civil and geotechnical
engineers to ensure that the construction drawings are consistent with the hydraulic
design. In addition, we will inspect the construction of the emergency stabilizers at least
on two occasions to ensure the contractor's work is consistent with the original design.
We will not initiate work on this task without receiving your authorization specifically for
the task. The estimated cost of our services for this task is $1,760.00.
Task 6 — Qualitatively Evaluate the Mechanics of Morning Canyon
Using the results of Tasks 1 through 5 we propose to evaluate the alluvial behavior of
Morning Canyon corresponding to the two conditions mentioned in Task 4. Under each
condition we will predict the response of the stream to future flood events. In a qualitative
manner, the results of this task will describe the future geometry of the stream if no
improvements are implemented. In addition, similar predictions will be made with our
proposed stabilizers and barbs.
Task 7 — Prepare the Draft and Final Study Reports
Rivertech Inc. proposes to summarize the results of the above tasks in a concise Draft
Report that will show the plan, profile and sections of the conceptual restoration plan.
However, for the emergency stabilizer at the existing headcutting and the barbs at 603
Rockford Road we will provide detailed hydraulic design information. We will integrate the
results of our analysis with those by LSA Associates
After receiving your review comments on the Draft Report we will finalize and submit the
Final Report to you.
Task 8 — Evaluate the Planned Restoration Plan at 603 Rockford Road
We understand engineers for Mr. Chris Wynkoop who resides at 603 Rockford Road are in
the process of preparing restoration plans for his slope. Using our HEC -RAS model which
we have already developed we will evaluate the impact of slope modification which will be
proposed by Mr. Wynkoop.
Task 9- Perform Design Level Hydraulic and Sediment Transportation Analysis
The purpose of this task is to perform dominant discharge analysis, determine stable thalweg
(channel bed) slope and calculate the design level magnitude of drops at the planned channel
stabilizers. Preliminary dimensions and configurations for the stabilizers will be provided
under Task 7. In the analysis of stable channel slope we would use procedures and
methodologies based on William Brownhe's Formula. Those procedures and methodologies
were used in planning and designing the streams in the Newport Coast Planned Community.
We will not initiate work on this task without receiving your authorization specifically for it.
The estimated cost of our services for this task is $8,040.00.
Task 10 — Perform Hydraulic Design of Stabilizers
Based on our planned concept for stabilizers, which includes both a choke and a drop, and
results of Task 9 we will hydraulically design and determine the dimensions of the 4
structures, the thickness of the Gabion mattress, gradation and size distribution of rocks. We
have communicated with Mr. Art Homrighausen of LSA and are envisioning a concept that
would allow the growth of vegetation through the Gabion mattress. In this manner the
stabilizer will blend in with the riparian nature of the existing stream. We will not initiate
work on this task without receiving your authorization specifically. for it. The estimated cost
of our services for this task is $7,880.00.
Task 11 — Attend Meetings and Provide Ongoing Assistance to the City
I will be available to serve on an as needed basis and to provide you with engineering support
during your communication with the homeowners along Morning Canyon. For purposes of
estimating budget, six 2 -hour meetings are envisioned. In addition, as needed, we will
respond to requests by the City staff for research to questions voiced by property owners,
performing supplemental engineering analyses and preparing additional exhibits.
Task 12 — Prepare Design Report
The planning level report of Task 7 will be revised and expanded to include the hydraulic
design of stabilizers, barbs and modifications planned by Mr. Wynkoop. The report will have
sufficient details on the basis of which construction drawings and specifications can be
4
prepared. We will not initiate work on this task without receiving your authorization
specifically for it The estimated cost of our services for this task is $4,280.00.
PROPOSED FEE AND SCHEDULE
The combined proposed fee for Rivertech Inc. and LSA Associates is estimated at $ 64,430.00,
as shown in the attached table entitled Estimated Labor and Fee. Rivertech's proposed fee is
based on our estimated labor to accomplish the above Scope of Work and Rivertech's Schedule of
Charges for 2002.
We will complete the hydraulic design of theEmergency Stabilizer and Barbs within two weeks
after receiving the survey data and your authorization to proceed with the revised Scope of Work.
After completing the design of the Emergency Stabilizer and Barb we will submit the Draft
Report to you within two weeks. After receiving your review comments on the Draft Report we
will finalize and submit the Final Report to you within one week. The total period proposed to
complete our services described would be about 9 weeks after receiving the survey.
Tbank you for the opportunity to submit this proposal. We are optimistically looking forward to
work with you in the referenced hydrologic and hydraulic analysis. If you have any questions or
require more information please do not hesitate to contact my Partner Mr. Atayee or me. I hope
the above Scope of Work meets with your approval and would appreciate receiving your
authorization on the revised Scope of Work
Sincerely,
RFVERTECH INC.
Hasan Nouri, P.E.
President
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