HomeMy WebLinkAboutAGENDA REPORT 1993 0505 CC REG ITEM 08FGO-T
FROM:
DATE:
AGENDA REPORT
C = TY O F MOORPARK
The Honorable City Council
TEM 8.
Kenneth C. Gilbert, Director of Public Works
April 28, 1993 (Council Meeting 5 -5 -93)
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SUBJECT: Consider Authorizing Distribution of a Request for
Proposals (RFP) for the Preparation of a Municipal
Stormwater Management Program and a Master Drainage Study
OVERVIEW
This requests approval of an RFP for the subject professional
services and authorization to distribute same to qualified
consultants.
DISCUSSION
A. Background
In an effort to clean -up the rivers and other waterways of the
nation, Congress amended the Federal Clean Water Act in 1987 to
require the Federal Environmental Protection Agency (EPA) to
establish a program to regulate the quality of stormwater
discharged into these water courses. To implement this
amendment, the EPA established the National Pollutant Discharge
Elimination System ( NPDES). This program established a number
of policies, regulations and procedures for the issuance of
stormwater discharge permits. The administration of this
Federal program has been delegated to the Los Angeles Branch of
the California Regional Water Quality Control Board (LARWQCB).
B. Joint NPDES Permit
The City has entered into an Implementation Agreement with the
Ventura County Flood Control District [VCFCD], the County of
Ventura and the other cities in the County for the purpose of
developing the Part 1 NPDES permit. Staff representatives from
each of these agencies have been meeting over the past several
months as the Ventura County Stormwater Task Force on efforts
necessary to comply with NPDES requirements.
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Stormwater RFP
Page 2
The schedule approved by LARWQCB for developing the permit
application focuses initial compliance efforts on the Calleguas
Creek watershed (VCFCD Zone 3). This area includes the Cities
of Simi Valley, Thousand Oaks, Camarillo and Moorpark, as well
as the unincorporated area within the watershed.
The Task Force, chaired by VCFCD, has been moving forward with
the permit application. A Consultant has been retained to
assist in that effort. The information to be included in the
permit application generally falls into two categories: a) data
pertaining to the entire watershed (to be provided by VCFCD);
and, b) data to be provided by each jurisdiction (the four
cities and the County).
C. City Effort
VCFCD is proceeding with the efforts required to gather the
watershed data. The county and the other cities in the
watershed are proceeding with efforts necessary to gather the
information required of each of them. Each has (or is about to)
retained the services of a Consultant to assist in this process.
The majority of the information required to be included in the
permit application from each local agency is to be presented in
a Municipal Stormwater Management Program to be developed by
each agency. Some of the information required to be included in
that program is information usually set forth in a City's Master
Drainage Study.
D. Program Requirements
The attached RFP requests proposals for the professional
services required to develop both of these documents. The RFP
describes the requirements to be met in each document. Those
requirements are summarized as follows:
Master Drainage Study -- This document sets forth information
related to storm drains and hydrology. The final report will
cover the entire City area and will include information on
topography, existing and proposed land uses, drainage areas and
boundaries, water courses, an analysis of storm drain design
parameters, existing storm drainage systems, proposed future
storm drain sizes and alignments and stormdrain capital
improvement costs. This document provides valuable information
for the planning and design of future land development and
infrastructure improvement.
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Stormwater RFP
Page 3
Municipal Stormwater Management Program -- This document
establishes a program mandated by the federal NPDES program.
The objectives of the final report will include: identification
of sources of illegal discharges, review and recommendations
regarding Best Management Practices (BMP) for reducing non -point
source pollutants and related information. The resources
required to prepare an adequate program include a municipal
Master Drainage Study. Again, this document is a requirement of
the Part 1 NPDES permit.
E. Fiscal Impact
1. Consultant Services
The estimated cost of these studies is as follows:
• Municipal Stormwater Management Program .... $40,000
• Master Drainage Study ...................... $60,000.
2. Funding
The Budget for FY 1992/93 includes $20,000 ($10,000 - Gas
Tax; $10,000 - General Fund) for this program. The other
cities in the County have elected to participate in the
VCFCD's Benefit Assessment District to fund all or a portion
of their stormwater management program. Although this source
was considered and rejected by the City Council in the Spring
of 1992 and again this March, this source is available for
consideration in future years.
It is recommended that the funding of these efforts be
provided by the General Fund, the Gas Tax Fund and Moorpark
Redevelopment Agency funds for that portion within the
boundaries of the Agency. In that the Master Drainage Study
will provide valuable resource information required to
prepare applications for development entitlements,
consideration should be given to the enactment of a
development fee to recover a portion of the cost of the
preparation of this Study.
3. Budget Amendment
It is recommended that consideration of additional
appropriations and a budget amendment be deferred until
selection of a consultant(s) is considered. It is also
recommended that the question of funding be referred to the
Public Works, Facilities and Solid Waste Committee for
discussion and recommendation to the full Council.
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Stormwater RFP
Page 4
4. Program Cost Accounting
The cost of the subject studies and related NPDES mandated
efforts will be accumulated in the newly established
Department 145 within the Department of Public Works.
F. Committee Review
The Public Works, Facilities and Solid Waste Committee has
discussed the progress of NPDES compliance. It is proposed that
the Committee and staff sit as the review panel in the selection
process for these consulting services.
RECONNENDED ACTION
Staff recommends that the City Council take the following actions:
1. Approve the attached RFP;
2. authorize staff to distribute same to qualified consultants;
and,
3. direct the Public Works, Facilities and Solid Waste Committee to
assist with the review and evaluation of responders to the RFP
and to review options and provide a recommendation regarding
project funding.
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Re c u e s t f o r Pro po s a 1 s
for Consulting Services for the Development of a
Mun i c i pa 1 s to rmwa t e r
Management Program
a n d a
Mast @ r D r a i n ag e s tucly
f or the
C z ty C:)--E
Moorpark
City of Moorpark
799 Moorpark Avenue
Moorpark, CA 93012
Submittal Deadline: June 1, 1.993
Table of Cor1-ttents
Page
I. Introduction 1
II. Master Drainage Study 2
III. Stormwater Management Program 6
IV. Qualifications 12
V. Proposal Format 12
VI. Evaluation and Selection 13
VII. General Requirements 13
VIII. Submittal Instruction 14
Appendix 'A': Approach for Preparing a Master
Drainage Study and a Municipal
Stormwater Management Program
I. INTRODUCTION
The City of Moorpark is participating with the County of
Ventura, the Ventura County Flood Control District and the
other cities in the County (the Ventura County Stormwater
Task Force) on various efforts to comply with the
requirements of the National Pollutant Discharge Elimination
System ( NPDES). These efforts include the development of
the certain data and information required by the Part 1
NPDES Permit for the Calleguas Creek watershed (Ventura
County Flood Control District Zone 3).
In an effort to comply with these NPDES requirements, the
City of Moorpark is requesting proposals for professional
services required to prepare a Master Drainage Study and a
Stormwater Management Program for the City of Moorpark.
Unless otherwise specified and or agreed to, the level of
effort and scope of work being requested shall be limited to
that effort necessary to prepare documents which meet the
minimum requirements of the NPDES program. In that these
two documents are so interrelated and interdependent, it is
the intent of the City to retain one firm to prepare both
reports.
In order to clarify the approach to be taken and the
resources useful for the preparation of the requested
reports, the City retained the services of the firm of Camp
Dresser & McKee to review certain historic documents and to
provide recommendations regarding the usefulness of those
documents in preparing the requested reports. Those
recommendations are set forth in the report attached hereto
as Appendix 'A'. Unless otherwise specified or approved,
the findings, recommendations and approach set forth in
Appendix 'A' shall be considered minimum requirements of
this RFP and shall be followed.
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II. MASTER DRAINAGE STUDY
The following is an outline of the Scope of Work required for the
development of a Master Drainage Study for the City of Moorpark.
A. Purpose
The purpose of the City of Moorpark Master Drainage Study
will be to identify the general features of the City's
drainage system designed to relieve flooding in existing
developed areas, and to project future needs for the
construction of new storm drainage facilities in both
developed areas and areas proposed for development.
B. Approach
Attached as Appendix 'A' is a report prepared by the firm of
camp, Dresser & McKee entitled Approach for Preparing a
Master Drainage Study and a Municipal Stormwater Management
Program. This report was requested by the City to determine
the feasibility of using certain previously prepared
Drainage Studies and related documents to lower the effort
and cost required to prepare the Master Drainage Study.
That report recommends the limited use of certain of these
documents in the preparation of the required comprehensive
study. Unless otherwise specified or approved, the
findings, recommendations and approach set forth in Appendix
'A' shall be considered to be a part of the minimum
requirements of this RFP. The City may consider any
suggested deviation or modification to said approach if
offered in the Proposal.
C. NPDES Requirements
The information set forth in the Master Drainage Study will
be used to identify sources of pollution as required by Task
2.2 of Section III of this RFP. Consistent with the minimum
requirements of the Purpose and Approach of the Master
Drainage Study as set forth above, the Study should attempt
to provide as much of the information required by the above
mentioned Task 2.2 as possible. Firms submitting Proposals
are required to state in their Proposal which elements of
said information and materials will be provided by the
Study. Those elements so identified shall be the first
order of work to be performed by the firm selected to
prepare the Master Drainage Study.
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D. Resources
The resources available to develop the Master Drainage Study
encompasses a number of types of materials including, but
not limited to, the following:
• Appendix 'A';
• Moorpark Downtown Drainage Study -- 1987;
• a number of drainage studies for limited drainage areas
which have been prepared by the developers of large
tracts of land within the City; and,
• storm drain improvement plans;
• "As- built" grading plans; etc.
E. Data Gathering Phase
The first task to be undertaken by the Consultant will be
the effort necessary to gather the information required to
develop the Study, including but not limited to the
information described above. To this end the City has
attempted to compile a list of drainage studies which have
been prepared, and a map indicating plan numbers for many of
the City's storm drains constructed. The City does not
represent that these resources are complete. Interested
firms are welcomed to review these materials at the City at
any time subject to scheduled appointment with the Director
of Public Works or his representative. It is the
responsibility Consultant to determine the effort required
to complete this data gathering phase.
F. Information to be Provided by the City
The Consultant shall provide the City with a list of
services, data and information required to be provided by
the City and a listing of requirements of City staff to
support the efforts required to produce the work product.
Interested firms are advised that the City resources are
limited and are advised to discuss the availability of said
resources with the Director of Public Works prior to
submittal of the Proposal.
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G. General Description
The Master Drainage Study should include maps, charts,
relevant data, narrative presentations and any other
information necessary to present a complete and
comprehensive Study which may include, but not limited to
the following:
• City boundaries;
• identification of existing and proposed land uses as they
affect current and anticipated storm water run -off and
hydrological data;
• impact of upstream development on the Arroyo Simi;
• the topography of the City;
• a hydrological analysis of the City;
• identification of the flood boundaries of major water
courses;
• identification of the boundaries of drainage basins and
sub - basin;
• identification of all existing storm drains and flood
control facilities under the jurisdiction of the Ventura
County Flood Control District (VCFCD);
• identification of retention basins, detention basins,
infiltration facilities, and other structural stormwater
control elements, both publicly and privately (HOA)
owned;
• identification of all existing storm drains and flood
control facilities under the jurisdiction of the City of
Moorpark;
• identification of all major existing storm drains and
flood control facilities under private ownership and /or
maintenance (i.e., Homeowner Associations);
• language describing the recommended storm drain design
criteria (Q -10, Q -50) to be used by the City;
Note: If different from present City policy, reasons
for a change in said policy should be prepared
and presented for consideration by the City
Council, prior to development of
recommendations regardinq future required storm
drains.
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• identification of the preliminary location, alignment,
size and preliminary inlet locations of required storm
drain facilities required to adequately provide for urban
stormwater run -off consistent with the adopted storm
drain design criteria; and,
• a listing of the estimated cost of land acquisition,
design and construction of all proposed storm drain
facilities;
• a discussion of various means and methods to fund the
construction of the proposed storm drain facilities;
• other information and materials necessary to adequately
present a fully comprehensive Master Drainage Study.
H. Options and Alternative
If necessary and appropriate, the Consultant may present to
the City a number of options or alternate methods to provide
for stormwater run -off for consideration and action prior to
the development of the final recommendations.
I. Scope of Work
Each Proposal shall set forth the Scope of Work proposed to
be undertaken by the Consultant in order to develop and
provide a Master Drainage Study to the City of Moorpark.
Said Scope of Work shall clearly set forth the Tasks and
Sub -Task required to fully compile, assess and analyze
necessary information, and to develop the conclusions and
recommendations to be reached in the Study.
J. Methods and Materials
Each Proposal shall set forth the materials, resources,
methods, techniques and approach to be taken in developing
the Study.
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III. STORMWATER MANAGEMENT PROGRAM
The following is an outline of the Scope of Work required for the
development of Stormwater Management Program in compliance with the
requirements of the NPDES.
Task l: Evaluate Existing Legal Authority
The purpose of this task is to determine the adequacy of the
City's existing legal authority to meet the criteria
established in the NPDES regulations to control discharges to
the City's storm drain system for the Calleguas Creek watershed
and to enforce compliance.
This task will evaluate the existing legal authority for the
City of Moorpark to:
• Control pollutants in stormwater discharges associated with
industrial activities.
• Prohibit illicit discharges to the storm drain system.
• Prohibit illegal dumping and control spills into the
stormwater system.
• Control pollutants from other jurisdictions through
interagency agreements.
• Require compliance with county ordinances.
• Carry out inspections and monitoring to determine
compliance.
This legal authority is based on case law, state governmental
codes, applicable codes and City ordinances. The existing
legal authority will be compared to the authority required in
the regulations and deficiencies will be noted. If the
existing legal authority appears to be inadequate, additional
actions needed by the City to establish the necessary authority
will be identified and a schedule for obtaining the authority
will be prepared. Resolution of inadequacies in legal
authority to control stormwater discharges is required later in
the Part 2 permit application.
The following items will be included in the evaluation of legal
authority:
• Relevant state statues or constitutional sections that
address the legal authority granted to the City for the
enforcement of NPDES regulations will be identified and
6
reviewed. The Consultant will prepare a statement regarding
the status of said authority and review same with the City
Attorney, if necessary.
Relevant local ordinances directly or indirectly regulating
discharges to the storm drain system will also be identified
and reviewed. These ordinances would include: erosion
control ordinances, flood control ordinances, zoning
ordinances when they regulate building near water sources,
and other local ordinances affecting urban runoff.
An evaluation matrix prepared by the Consultant, which
compares the existing legal authority available to the City
with criteria specified in the NPDES regulations.
A summary description prepared by the Consultant, which sets
forth any inadequacies in existing legal authority to
control discharges and any constraints under existing laws
or statutes that might prevent the City from effectively
enforcing ordinances governing discharges to its storm drain
system. A description of actions and a schedule to mitigate
these inadequacies and /or constraints will also be provided.
Products for Task 1:
• Copies of relevant state statues or constitutional
sections.
• Copies of draft municipal ordinances regulating
discharges.
• Evaluation matrix comparing existing legal authority to
the controls suggested or required by the NPDES program.
• Description of any inadequacies and /or constraints with
plan of action and schedule.
Task 2: Sources Identification
2.1: Existing Ordinances Limiting Discharges to WWTPs
The existing City ordinances, policies, guidelines, and
procedures that regulate industrial discharges and /or prohibit
illegal connections to storm drain systems, flood control
systems or natural water courses will be reviewed and
evaluated. The Consultant will also review and evaluate
ordinances, policies, guidelines and procedures of County
Waterworks District #1 which regulate industrial discharges
and /or prohibit illegal connections to the sanitary sewer
system. Some industrial discharges (e.g., non- contact cooling
7
water) may be prohibited at wastewater treatment plants if such
discharges adversely affect plant operation. If a discharge is
prohibited from the sanitary sewer, it becomes a possible
source to the storm drain system. The consultant will identify
all significant discharges prohibited from the sanitary sewer
system, and evaluate the potential for these discharges to
enter the storm drainage system.
Products for Task 2.1:
Copy of any ordinances limiting discharges to publicly
owned wastewater treatment plants.
Description of how existing policies and practices of
County Waterworks District #1 to prohibit discharges to
WWTPs may cause illicit discharges to the storm drains,
and how such discharges are prevented.
2.2: Develop Source Identification Database
The purpose of source identification in the Part 1 permit
application is to identify possible sources of pollutants to
the storm drain system, to provide a better understanding of
potential water quality problems, and to form a basis for the
development of a stormwater management program in the Part 2
application.
It is anticipated that the Master Drainage Study to be prepared
in concert with this Stormwater Management Program will compile
and present much of the storm drainage collection system
mapping required to enable the Consultant to develop the source
identification required by this section. The Consultant will
draw upon that document and /or provide additional supplemental
information as necessary to provide the information set forth
below.
Source identification parameters to be mapped by the Consultant
shall include the following:
• City boundaries;
• Drainage basin and sub -basin boundaries;
• Retention basins, detention basins, infiltration
facilities, and other structural stormwater control
elements (except those owned /operated by VCFCD).
• Major storm drains, as defined in the U.S. EPA NPDES
permit application regulations.
0
• Verification of existing municipal and industrial NPDES-
permitted discharges mapped by VCFCD.
• Operating and closed landfills and other facilities
requiring waste discharge permits, including hazardous
waste treatment, storage and disposal facilities.
• Existing land use including residential, commercial,
heavy industrial (manufacturing), light industrial
(industrial parks), institutional, major highway,
landfill, agricultural, undeveloped lands, and open
space.
• Findings regarding the impact upon stromwater pollutants
in the City of Moorpark which are generated by sources
upstream of the City limits.
Tables will be prepared describing acreage, estimated
population densities (both existing and projected for the next
ten years), and rational formula runoff coefficients (and
percent impervious) for each land use area.
Products for Task 2.2:
. Maps showing drainage and land use information.
• Tables of acreage, estimated population densities and
rational formula runoff coefficients (and percent
impervious) for each land use category.
Task 3: Perform Dry Weather Field Screening
The Consultant will select dry weather field screening sites
and perform dry weather field screening according to procedures
approved by the Ventura County Stormwater Task Force. A
maximum of 30 representative sites will be screened in the City
of Moorpark. If dry weather flow is detected, two grab samples
will be tested using approved field testing measures. Grab
samples must be taken between 4 and 24 hours apart. Results
will be presented in a format approved by the Ventura County
Stormwater Task Force for compilation into a county -wide
database.
Products for Task 3:
• Dry weather field screening results for a maximum of 30
representative sites in the City.
9
Task 4: Existing Management Programs
The purpose of this task is to prepare a description of the
City of Moorpark's existing programs and structural control
facilities which serve to control pollutants in stormwater
discharges. Procedures for the conduct of this task have been
developed by the Ventura County Stormwater Task Force.
Existing management programs may include, but are not limited
to, the following:
• Wetland protection measures.
• Floodplain management controls.
• Emergency spill response plans.
• Procedures to control pollution from construction
activities.
• Best management practices for new subdivisions.
• Flood control structures.
• Source controls, such as anti - litter regulations, street
sweeping, recycling programs, public education.
• Paint warning or logos near storm drain inlets to
discourage dumping waste oil, etc.
The City's existing programs for identifying illicit
connections to the storm drain system will be described
including methods and procedures, and the areas where the
program has been implemented.
Products for Task 4:
•
Description of existing stormwater management program,
including operation and maintenance information.
Task 5: Existing Fiscal Resources
Based on guidelines prepared for and approved by the Ventura
County Stormwater Task Force, the Consultant will prepare a
description of the financial resources currently available to
the City to undertake and complete the following:
a) the assessment efforts described herein and required by the
NPDES Part 1 application; and,
b) the requirements of the Part 2 of the application.
10
Information on fiscal resources to carry out the Part 2 permit
requirements is a requirement of the Part 1 permit application.
This identification of fiscal resources will include:
A description of the portion of the City's budget for
stormwater for the year following submittal of the Part 1.
application (or estimated budget).
• A description of the funding mechanism used to obtain the
monies in the City budget for stormwater activities (e.g.,
general funds, gas tax, special assessments, revenue bonds,
user fees, etc.).
• A description of the City's indebtedness and a list of
municipal assets, including a list of sources of municipal
funds with the approximate percentage associated with each.
Products for Task 5:
A technical memorandum describing the fiscal resources
for stormwater management in the City of Moorpark.
Task 6: Information to be Provided by the City
Consultant shall provide the City with a list of services, data
and information required to be provided by the City and a
listing of requirements of City staff time required to support
the efforts required to produce the work product. Interested
firms are advised that the City resources are limited and are
advised to discuss the availability of said resources with the
Director of Public Works prior to submittal of the Proposal.
Products for Task 6:
• A list of materials, information and City staff services
required.
Task 7: Submittal Preparation
Consultant will prepare Part 1 technical memorandum for
submittal to the VCFCD and review by the Ventura County
Stormwater Task Force. Drafts will be submitted by the
Consultant to the City of Moorpark for review thirty (30) days
in advance of the above submittal.
Products for Task 7:
• A transmittal report to VCFCD.
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IV. QUALIFICATIONS
Proposals shall include information which clearly describes and
demonstrates appropriate and relevant qualifications of the
Consultant to perform the services being requested.
V. PROPOSAL FORMAT
Each proposal should be organized so as to clearly address the
following requirements:
A. Agents and Address: List the names, qualifications, and
experience of the individuals assigned to provide the
requested engineering services and designate the person to
serve as Project Manager. List the location, address, and
telephone number of the office from which the services are
to be provided. Any sub - contractors or sub - consultants
proposed to be used, should also be listed.
B. Statement of Qualifications: Provide sufficient information
to demonstrate that the consultant and associates possess
all of the qualifications required.
C. References: Include a list of names, addresses, telephone
numbers, and contact persons of agencies for which similar
services have recently been provided.
D. Methods: Provide a statement describing the methods, means
and approach to be used in compiling and assessing necessary
data required to develop the work product, as well as those
to be used in developing the conclusions and recommendations
required by the work product.
E. Description of Work Product: Provide a statement describing
the _Scope of Work to be provided, including the various
tasks required and the phases of work.
F. Work Schedule: Provide a matrix bar chart indicating the
various tasks required and the start /completion date for
each. It is expected that the work should commence in July
and be completed by November, 1.993.
G. Fee: The fees for the services to be provided shall be
submitted in a separate sealed envelope. The fee should
clearly state the fee amount for both the Master Drainage
Study and the Stormwater Management Program. The
consultant's fee shall include:
1) an ESTIMATED FEE and a NOT TO EXCEED FEE for each phase
of the work;
2) the per cent of total quoted for each phase of the work;
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3) a list of classifications of work and the hourly rate for
each, said rate schedule to be used for computing the
cost of any extra work requested by the City; and,
4) a listing of the various categories of Reimbursable
Expenses, if any, not included in the fee, along with the
rates to be charged.
VI. EVALUATION AND SELECTION
The City will consider selection of a consultant from the list
of those submitting proposals. The selection process will
consist of the screening of proposals by City staff and may
require presentations before the City Council Public Works,
Facilities and Solid Waste Committee. The recommendations of
staff or the Committee will then be forwarded to the City
Council for consideration.
Proposals will be evaluated on the basis of qualifications,
experience, staff resources, understanding of the scope of
work, approach, methods and procedures, commitment to schedule,
fee and other pertinent information.
VII. GENERAL REQUIREMENTS
A. Work Schedule
The Proposal shall set forth a work schedule for all phases
and elements of the work. It is anticipated that the amount
of time required to perform all of the work required, should
not exceed four to five months.
B. Final Product
The selected consultant will be required to develop options,
alternatives and /or preliminary reports to be reviewed and
approved by City staff. The Consultant may be required to
make a presentation before the City Council Public Works,
Facilities and Solid Waste Committee prior to the
development of the final work product.
The required number of copies of the reports are listed as
follows:
Preliminary Reports for
Preliminary Reports for
Final Draft Reports for
Final Approved Reports
Master Drainage Study
Stormwater Management
13
staff review .......... 2
Committee review ...... 4
City Council review ... 10
...................... 50
Program .............. 20
VIII. SUBMITTAL INSTRUCTIONS
A. Submittal Date: All proposals must be received by the City
Clerk by 4:00 p.m. Monday, June 1, 1993.
B. Form: Six (6) identical copies of the proposal(s) shall be
submitted in a sealed envelope(s) with the company's return
address and the words: "Proposal: Stormwater Program" on
the outside. Again, the consultant's fee shall be placed in
a sealed envelope inside the proposal package and shall be
so marked. The proposals should be addressed as follows:
City of Moorpark
799 Moorpark Ave.
Moorpark, California 93021
ATTN: "Sealed Proposal -- Stormwater Program"
C. General Information
1) Proposals shall be signed by an authorized official of
the consulting firm.
2) Proposals shall be valid for a minimum of sixty (60)
days.
3) The City reserves the right to reject any and all
proposals with or without cause, and waive any
informalities as may occur in the bid process.
4) The terms and scope of the contract will be arrived at on
the basis of negotiations between the City and the
Consultant. If the City and prospective consultant fail
to reach a contractual agreement, the City may enter into
negotiations with another firm.
5) The City reserves the right to expand or reduce the scope
of the work subject to negotiation with the successful
firm.
6) Attached for your information and review is a sample
Professional Services Agreement.
D. Inquiries: Telephone inquiries should be directed to the
following:
rp \rp[ \npd...r!p
Ken Gilbert, Director of Public Works
(805) 529 -6864
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APPROACH FOR PREPARING
A MASTER DRAINAGE STUDY
AND A MUNICIPAL STORMWATER
MANAGEMENT PROGRAM
CITY OF MOORPARK
FEBRUARY 22, 1993
APPROACH FOR PREPARING A MASTER PLAN OF DRAINAGE AND
A MUNICIPAL STORMWATER MANAGEMENT PROGRAM
CITY OF MOORPARK
Executive Summary
Extensive data exists and studies have been conducted about the
storm drain system in Moorpark. This report assesses these
existing data sources and defines a cost - effective approach for
data collection which incorporates much of this existing
information:
o Drainage system data can be taken from previous studies
(where available) and tract maps from storm drain and
street improvement plans for areas 50 acres and larger.
o Existing and buildout land use are adequately
represented by the Existing Land Use Survey of May,
1992 and the Land Use Element of the General Plan,
respectively. Aerial photos are available to spot
verify land use and to determine impervious areas
representative of the predominant land use categories.
o Previous studies contain watershed delineation and
watershed parameters for much of the City. It is
recommended that this watershed data be verified,
particularly to check that buildout land use conditions
area compatible with the Land Use Element.
The Central City Master Drainage Study, the Urban West
Communities /PC -3 development plans, and Peach Hill Wash LOMR
appear to recommend adequate drainage solutions for projected
future conditions, and need not be repeated.
Moorpark should closely integrate the work effort for the Master
Drainage Study and the Municipal Stormwater Management Study.
Many of the requirements of both of these studies are either
identical or similar:
o Storm drain, watershed, and land use information is
required for both studies.
1
o A single field reconnaissance survey can be conducted
to verify and supplement storm drain data, perform dry
weather field screening at representative locations in
the storm drainage system, and investigate flooding
areas and known pollution sources.
o Water quality evaluations and stormwater pollution
control recommendations are to be incorporated into
flood control and drainage planning studies according
to the requirements of the Municipal Stormwater
Management Program. These requirements can be met by
addressing numerous policies in the Land Use Element
which are compatible with storm water pollution control
requirements.
Study Requirements
Moorpark seeks a consultant to prepare a Master Drainage Study
which incorporates valid data and suitable recommendations of
previous drainage studies. Moorpark must also develop a
Municipal Stormwater Management Program to meet the requirements
of a proposed Ventura County National Pollutant Discharge
Elimination System (NPDES) permit for the municipal storm
drainage system. Many of the data requirements for both these
protects are the same. and data collection efforts should be
integrated to support both projects. The remainder of this
section summarizes the major work products of these two studies:
o Master Drainage Study
Planning criteria:
o Flood control objectives (e.g., design storms,
acceptable flood stages)
o Multi- objective opportunities (e.g., greenbelts,
natural buffer areas, parks, aquifer recharge,
riparian habitat, xeriscaping)
o Cost - effectiveness considerations
o Community /socio- economic considerations
o Environmental /storm water pollution impacts and
benefits
Maps /databases of drainage system, watersheds
2
- Projected watershed runoff under various scenarios:
o Land use patterns (e.g., existing, buildout)
o Design storms (e.g., 2 -yr, 10 -yr, 25 -yr, 100 -yr)
- Recommended Drainage /Flood Control Measures
o Storm Drains (design flows, conceptual design
parameters, approximate alignments)
o Regional Detention /retention (design storage
volume, conceptual design parameters, suggested
locations)
o On -site detention /retention guidelines (acre -ft
per acre criteria, maximum release rates)
o Policies (flood plain management, maintenance)
o Optional: Storm water pollution control
requirements
Cost Estimates /Financing Plan
o Municipal Stormwater Management Program, required under the
Ventura County NPDES permit. Note: some information will
be supplied by the Ventura County Flood Control District,
while the following data is the responsibility of Moorpark:
Part l information (due 12/93)
o Assessment of existing legal authority to control
storm water and storm water pollutant sources.
o Mapping /databases
- Storm drain outfalls
- Watersheds and /or topography
- Existing Land Use
- Other significant pollutant sources
o Dry Weather Field Screening at representative
locations in the storm drain system to gather
evidence about the extent of non - stormwater
discharges into storm drains.
o An assessment of existing programs conducted
within Moorpark which may directly or indirectly
control storm water pollution.
o An assessment of existing fiscal resources of
Moorpark, and the funding source for storm water
r
programs in the City.
Part 2 information (due 12/94)
3
o Resolution of any deficiencies in Moorpark's legal
authority to control storm water pollution.
o An inventory of industrial activities (including
construction sites) which discharge into
Moorpark's storm drain system
o An estimate of the average annual storm water
pollutant loads discharged from Moorpark's storm
drains.
o A comprehensive storm water management program to
reduce storm water pollution to the maximum extent
practicable:
- Drainage system and roadway O &M practices
- Control measures required of new development
- Storm water pollution controls to be
integrated with flood control facilities
- Controls on pesticides and fertilizers
- Measures to eliminate connections,
discharges, spills, and dumping of pollutants
into storm drains.
- Inspection, monitoring, and control measures
for industrial activities.
- Planning procedures, control measures and
inspections for erosion, sedimentation, and
other pollution on construction sites.
- An assessment of the pollutant load
reductions expected from this program.
o A five -year budget for staff, equipment,
facilities, studies, etc., with a commitment that
funds are available.
This report focuses on the Master Drainage Study and Part 1 of
the Municipal Stormwater Management Program. Part 2 of the
Municipal Stormwater Management Program will not begin until Part
1 is complete, and will probably be performed under a contract
with the VCFCD. The work plan for the Master Drainage Study is,
however, impacted by Part 2 of the Municipal Stormwater
Management Program, which requires that new development and
municipal drainage projects inco =orate stormw.ater
pollution/water qualitevaluati.ons into the planning process.
Thus we suggest that evaluation criteria be incorporated into the
Master Drainage Study which address water quality issues.
4
Assessment of the Land Use Element of the General Plan
The Master Drainage Study should be based on projections of land
use at buildout conditions to ensure that storm drain facilities
are not undersized. The Land Use Element of the General Plan is
Moorpark's current vision of buildout conditions. In addition to
the type and density of development, the Land Use Element also
spells out numerous other conditions of development which need to
be addressed by the Master Drainage Plan and also may result in
stormwater pollution control opportunities under the Municipal
Stormwater Management Program. These conditions can be grouped
into two broad categories:
Preservation and Enhancement of Natural Drainageways. The Land
Use Element spells out several goals relating to natural
drainageways:
o Preserving oak tree stands in hillside drainageways.
o Preservation of open space in the floodway and flood
plain of the Arroyo Simi.
o Protecting and promoting aquifer recharge areas.
o Protecting riparian habitats.
Natural drainage systems retard stormwater flows, reducing
flooding (if the floodplain is not developed). Natural drainage
systems also trap sediments which convey stormwater pollution,
erhance bio- degradation of pollutants, and promote infiltration
for aquifer recharge.
Landscaping and Open Space Policies. There are several policies
in the Land Use Element in this category:
o Using landscaped or natural buffer areas around and
within residential areas, for wildlife corridors, and
in public rights -of -way.
o Promoting xeriscaping.
o Providing 5 acres of park land for every 1000 people.
o Integrating development into natural features.
o Preserving 25 percent open space in specific planning
areas.
These policies may be integrated with the Master Drainage Study
and the Municipal Stormwater Management Program in the following
ways:
5
o Less runoff is generated from open space than from
impervious areas, thus reducing the cost of flood
control facilities.
o Runoff can be diverted onto open spaces (except in
hillside areas) and allowed to percolate into the soil,
further reducing and retarding storm flows.
o Reducing runoff from impervious areas lowers the per
acre stormwater pollution loading.
o If properly graded, natural areas can act as filters
for stormwater pollutants.
o Erosion and sedimentation, particularly during
construction, can be reduced by integrating development
into the natural terrain and protecting sensitive
natural areas like hillsides and drainageways.
o Diverting runoff to xeriscaped areas reduces runoff and
stormwater pollution loads while also reducing
irrigation requirements for landscaped areas.
o Park land and other open space may be cost - effectively
integrated with stormwater management facilities (e.g.,
detention /retention basins, linear parks along
drainageways).
Assessment of Previous Drainage studies
A primary objective of this report is to determine how best to
incorporate previous drainage studies into the Master Drainage
Study and the Municipal Stormwater Management Program. There are
several ways these studies may be incorporated:
o Previous studies may contain storm drain and /or
watershed data which can be incorporated into a
watershed planning model.
o Evaluation of the existing storm drain system may not
be required in areas where the system was built to
acceptable design criteria, no upstream development
will drain into the system, and the existing land use
is consistent with the Land Use Element of Moorpark's
General Plan.
o Capital improvements recommended in previous studies
can be incorporated into the Master Drainage Study
without further evaluation if the design criteria and
buildout land use assumptions are consistent with the
Land Use Element of Moorpark's General Plan.
6
The remainder of this section gives an overview of the previous
studies which can be used to reduce the level of effort of the
Master Drainage Study and the Municipal Stormwater Management
Program.
Moorpark Central City Master Drainage Study (3/87). This study
is similar to the Master Drainage Study, but only addresses the
central portion of the City north of the Arroyo Simi. Storm
drains were sized for the 100 -year event using the Ventura County
hydrologic method. Existing drainage facilities were verified
during this study, and several of the recommended drainage
improvements have either been built or are under construction.
Data from this study can be directly incorporated into required
maps and databases.
The General Plan has recommended that the recommendations of the
Central City Master Drainage Study be implemented. These study
recommendations should be valid unless the City wishes to:
o Significantly increase the proposed density and /or
imperviousness of the redevelopment plan for the
Central Business District.
o Investigate the cost - effectiveness of sizing storm
drains for a smaller design storm.
Walnut Canyon Study (9/80). This study evaluated several
development projects proposed for the northwest part of the City
but never constructed. Improvements to existing drainage
facilities were recommended, and construction costs estimated.
This study appears to be a good source of existing storm drain
and watershed data. However, the recommendations should be
reconsidered in the Master Drainage Study for three reasons:
o The land use assumptions may not be the same as the
current Land Use Element of the General Plan.
7
o The impacts of development along Walnut Canyon on the
recommended downstream drainage improvements in the
Central City area should be explored.
o The storm water pollution control requirements of the
Municipal Stormwater Management Program may change the
recommended storm drain requirements when development
occurs.
Urban West Communities /PC -3 (Tract 3274) . Various studies have
been conducted for a large, on -going development project south of
Arroyo Simi and west of Country Meadow Street. The most recent
reports, coupled with the latest tract maps, should be adequate
for defining the existing drainage system. There should be
little benefit to re- evaluating the size of the storm drains
within this Tract, unless the City has reason to believe that
drainage problems exist.
Peach Hill Wash LOMB. The Peach Hill Wash project consists of a
drainage channel designed as a linear park, discharging into a
desilting basin. The project, which serves as the major flood
control facility draining Tract 3274 and other upstream areas,
has received significant evaluation and probably does not require
a re- assessment for the Master Drainage Study. This project
should provide stormwater pollution control benefits, which,
according to NPDES Permitting requirements, should be quantified
and, if possible, optimized under the Municipal Stormwater
Management Program.
Other Drainage_Studies. The other studies listed in the RFP may
provide some drainage system data, but will probably not present
any significant cost savings in the conduct of the Master
Drainage Study and the Municipal Stormwater Management Program.
8
Data Requirements and Assessment of Existing Data
Table 1 lists data required for conducting the Master Drainage
Study and the Municipal Stormwater Management Program, existing
data sources and, where appropriate, the proposed level of detail
at which this data is required. A discussion of this data
follows.
Drainage System Data. Data about major storm drains (i.e.,
pipes, channels, conduits, ditches, and other conveyances for
storm water) is a requirement of both studies. First, a
map /database of the major storm drains is mandatory for
performing the Master Drainage Study. Storm drain data includes
cross - sectional area, length, slope, and material. Second, the
Municipal Stormwater Management Program requires a map of
outfalls from storm drains with the capacity of a pipe 36 inches
in diameter or larger, except in industrial areas, where outfalls
from storm drains with the capacity of a pipe 12 inches in
diameter or larger must be mapped. other smaller storm drains
and storm drain inlets are not required for either study, but may
be cost - effective to map during the study.
The City has a good file index, and fairly complete files of
drainage and street improvement plans referenced to tract maps.
The City has begun transferring this information onto a
street /parcel map of the City (available from Ventura County),
but have only completed about 10 percent of the City. This map
shows the tract numbers, easing the extraction of storm drain
data from the tract maps. Several previous studies, particularly
the Central City Master Drainage Study, have already extracted
storm drain data and thus should be a more easily accessible
source of data.
9
Table 1. Data Requirements
Data Item
Existing Data Source(s)
Required
for
Master
Plan of
Drainage
Required
for
Municipal
Stormwater
Management
Program
Land Use
- Existing
Land Use Inventory, 5/92
yes
yes
- Buildout
General Plan, Land Use Element
yes
optional
- Public Open
Parcel, Real Estate Records
yes
yes
Land
- Easements
Tract Maps
yes
no
Watersheds
USGS 7.5 minute topographic maps
Ventura County topographic maps
- Developed
Previous Drainage Studies
50 ac
50 ac
Field Verification
- Undeveloped
500 ac
500 ac
Drainage System
Tract Maps
Central City Drainage Study
- Pipes
Field Verification
• Major
36 inch
36 inch
• Minor
optional
industrial
- Open Channels
3 cross-
location
(min. drainage
sections/
area = 50 ac)
mi.
- Storage Basins
5 ac -ft
5 ac -ft
- Inlets
optional
N/A
Arroyo Simi
FEMA FIS Study
boundary
N/A
Backwater
Soils
SCS Sail Association Data
yes
N/A
Industries
Business Licenses
N/A
yes
Field Reconnaissance
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With these considerations in mind, the following procedure is
recommended for completing the drainage system inventory:
o Prepare drainage system mapping criteria and data
collection forms. Incorporate mapping and data
collection criteria defined by the VCFCD for the NPDES
Part 1 Permit Application.
o Transfer drainage system information from the Central
City Master Drainage Study onto the base map.
o Restrict further transfer of drainage system
information to tract maps for projects larger than
about 50 acres. This should yield a relatively
comprehensive map of storm drains 36 inches (or
equivalent) or larger. Transfer other drainage system
information which is readily available on these tract
maps (e.g., smaller pipes, inlets, easements).
o Have City staff review and verify this information in
the office. Areas determined to have insufficient
drainage system data would be targeted for additional
data collection.
o Conduct a combined field reconnaissance /dry weather
field screening survey of the storm drain system.
During this survey, field verify the previously mapped
drainage system information, and collect additional
drainage system data where necessary. Also locate
outfalls from 12 inch storm drains (or their
equivalent) in industrial areas during the dry weather
field screening.
o Complete the drainage system map /database based on the
field reconnaissance survey.
Watersheds. Watersheds must be delineated for each study. A
minimum watershed size of 50 acres is recommended in developed
areas, as this is the size of a watershed tributary to a 36 inch
diameter pipe (or equivalent) on a moderate slope. Watershed
boundaries can be transferred directly from the drainage studies
discussed in the previous section. Other watershed delineation
would be best performed using available topographic maps, and
field verified during the dry weather field screening program.
11
In undeveloped areas, it is not necessary to use a detailed
watershed delineation- -only one suitable for sizing large storm
drains, and for defining detention /retention sizing requirements,
and /or specifying performance criteria for storm water pollution
control. Therefore a minimum watershed size of 500 acres should
be sufficient in most undeveloped portions of watersheds in the
vicinity of Moorpark.
Land Use Data. A land use map is essential for both the Master
Drainage Study and the Municipal Stormwater Management Program.
The City of Moorpark Land Use Inventory, completed 11/89 and
updated 5/92, represents existing land use, while the City of
Moorpark General Plan, Land Use Element (adopted 5/92) would be a
reasonable representation of future land use. Categories of land
use shown on each of these land use maps are sufficient for both
studies. The area of each land use within each watershed must be
determined. Aerial photographs (1 inch equals 100 ft) from 1990
should be used to verify existing land use and to estimate the
impervious area of representative land use categories in the
City.
Other Data. It should not be necessary to calculate flows in the
1 Arroyo Simi for the Master Drainage Study. Existing flows and
backwater elevations are available in the FEMA FIS. The area of
l development within the existing boundaries of Moorpark is a small
percentage of the total Arroyo Simi drainage area, and thus
development will not increase flows significantly.
Soil infiltration characteristics can be derived using soil
1 association data from the Soil Conservation Service Soil Survey,
Ior equivalent data. Information on industries is not required
j until Part 2, and will not be collected at this time.
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Recommended Work Plan Elements
i As the previous discussion indicates, sufficient data exists to
conduct the Master Drainage Study and prepare the Municipal
Stormwater Management Program. The level of effort to conduct
the Master Drainage Plan can be reduced by incorporating the
recommendations of previous studies in the Central City and the
Urban West /PC -3 project. Master drainage planning should be
conducted in the remainder of Moorpark. Additional reductions in
j the level of effort can be achieved if the Master Drainage Study
is integrated with the Municipal Stormwater Management Program.
iThe remainder of this section outlines an integrated work plan
for both studies.
I. Data collection and analysis
i The greatest cost savings can be derived by merging the data
collection and analysis tasks of both studies. Drainage
system data, watersheds, and land use information is
essentially the same for both studies, as described earlier.
The data collection subtasks include:
o Land use mapping: Existing land use maps adequate;
some verification advised.
o Drainage System Mapping /Database: Data should be
collected according the procedure outlined previously.
o Inventory of vacant public land: Can be determined
through review of parcel data, tract maps, and limited
field reconnaissance.
o Other NPDES Pollution Source Identification Data:
Most, if not all of this data will be collected by the
VCFCD under a separate contract.
13
II. Develop planning criteria
Possible planning criteria were discussed above. Criteria
should address drainage system needs, stormwater pollution
control objectives, and General Plan policies.
o Drainage: The City desires that a sensitivity
evaluation be performed on the economic trade -offs and
flood control benefits of alternative design storms.
o Backwater from Arroyo Simi may be used as a boundary
condition for the Master Drainage Study. Flooding
adjacent to the Arroyo Simi can be derived from the
current FEMA FIS flood stages.
o Evaluation criteria for drainage alternatives should
incorporate stormwater pollution control objectives
which address future Municipal Stormwater Management
Program requirements. Many of the policies of the Land
Use Element of the General Plan are compatible with
stor-mwater pollution control objectives.
III. Assessment of Existing Management Programs
This task is a requirement of the Municipal Stormwater
Management Program. Such an assessment can yield valuable
insights into the institutional structure for implementation
of the Master Drainage Study. The assessment is performed
by interviewing personnel in Public Works and Planning.
Topics to be assessed include:
o Management Practices (e.g., drainage system O &M)
o Administrative Policies (e.g., development plan review
and inspections, business licensing practices).
o Legal Authority (e.g., City code review)
o Organizational structure and existing staff and
equipment commitments.
l o Financial Resources of Moorpark
14
IV. Assess existing, future conditions
Elements of this task address both the Master Drainage Study
and the Municipal Stormwater Management Program:
o Interview staff and review other pertinent data to
identify known drainage and stormwater pollution
problem areas. Use to establish priorities for study
objectives.
o Conduct combined field reconnaissance survey to verify
drainage system data, perform NPDES dry weather field
screening program, and investigate known
drainage /pollution problem areas.
o System -wide evaluation: A primary objective of any
Master Drainage study is to define surface runoff flows
and volumes under alternative land uses and design
storms, and to identify flooding problems under
existing and buildout conditions. This involves
establishing a computer model of the storm drain
system. Most likely, the Ventura County hydrologic
method will be applied because of its high level cf
acceptance by government officials and the development
community. Other methods may be used (e.g., HEC -1,
SWMM) if specific hydrologic /hydraulic conditions
warrant. As an option, it may be advisable to
calculate existing annual average stormwater pollutant
loads (a requirement of Part 2 of the Municipal
Stormwater Management Program), since the same data is
used as for projecting flood flow conditions (i.e.,
land use, runoff coefficients, watershed areas, travel
time) .
V. Evaluate alternatives
Evaluating alternatives means applying the planning criteria
discussed above to select the most cost - effective,
implementable solution to stormwater problems. As discussed
above, drainage planning must address environmental and
stormwater pollution control considerations to meet the
objectives of both the Municipal Stormwater Management
Program and the Land Use Element of the General Plan.
Alternative evaluation may be performed as follows:
15
o Define drainage alternatives (e.g., Channels, storm
drains, detention /siltation basins, floodplain
management)
o Define Best Management Practices which might be
integrated with drainage alternatives (e.g., natural
drainage systems, enhanced catch basins, extended
detention basins, permeable paving materials, erosion
control)
o Define multi -use opportunities which can be integrated
with drainage facilities (e.g., Greenbelt parks,
recreational facilities, habitat, planned open space)
o Apply evaluation criteria (e.g., flood control
benefits, water quality benefits /impacts, environmental
impacts /benefits, implementability, community
acceptance, cost - effectiveness)
o Select preferred alternative
VI. Prepare Master Drainage Study Report
A Master Drainage Study Report addresses all elements of
this study, and serves as the guide to implementing the
study recommendations. The report should discuss the
following topics:
o Executive Summary
o Planning Area Characteristics
Watersheds
Drainage System
Land Use
o Planning Criteria
- Master Planning Approach
- Hydrologic /Hydraulic Evaluation Criteria
- Facility Design Criteria
- Alternative Evaluation Criteria
o Drainage Facilities Plan
Approximate Loclit. ions
Conceptual Design Parameters
Implementation Considerations and phasing
16
o Stormwater Management Policies
Flood Control
- Erosion and Sedimentation Control
Stormwater Pollution Management
o Storm Drainage Maintenance Program
o Cost Estimate
o Financing Alternatives
o Conclusions and Recommendations
VII. Prepare Part 1 Municipal Stormwater Management Program
This task will take the results of the previous tasks and
prepare a report which addresses the NPDES permitting
requirements and the guidance /requirements prepared by the
VCFCD for the Calleguas Creek watershed. Elements of this
report include:
o Assessment of Existing Legal Authority
o Source Identification
Land Use Map
Drainage System Map
Pollutant Source Data
o Discharge Characterization
Dry Weather Field Screening Findings
o Existing Management Programs
- Summary of Master Plan of Drainage
- Summary of Storm Drainage Maintenance Program
- Pollution Source Control Programs
- Inspection and Enforcement Programs
- Education and Training
o Fiscal Resources
- Sources of funds
1 - Indebtedness
Stormwater Management Program Budget
17