EXHIBIT A
SCOPE OF WORK
CONTRACT No.
Yavapai County Flood Control District
West Chino Valley Floodplain Delineation Re-Study
GENERAL
This floodplain delineation re-study will determine mapping changes for the existing Zone AE (with
floodway) along the Chino Valley Stream and Tributaries south of Road 5 North in Yavapai County.
Approximately eleven linear miles of floodplain will be re-delineated. The existing floodplains are within
Yavapai County and are included as exhibits to this scope of work.
This Yavapai County Flood Control District (DISTRICT) project consists of utilizing the 100-year
hydrologic analysis for the 24-hour rainfall event completed in 2002 to prepare the re-delineation of the
100-year floodplains based on improved topographic mapping (also completed in 2002) and the revised
hydrology and changed conditions within the watershed. The floodplain will be based on results of using
the U.S. Army Corps of Engineer's HEC RAS computer model.
The CONSULTANT will utilize the existing topographic data and hydrology, with minor updates, to redelineate the floodplains.
All work will meet Arizona Department of Water Resources (ADWR) and Federal Emergency
Management Agency (FEMA) requirements for floodplain delineations. Prior to the finalization of this
contract, FEMA and the DISTRICT must review and accept the results of this study, and all items called
for in this Scope of Work must be delivered to the DISTRICT. The CONSULTANT will submit the study
to FEMA for review and approval.
All work must be completed within 638 days from the Notice to Proceed (NTP). The Consultant
will complete the project within 273 days for submittal to FEMA for their review and approval.
This includes 30 days for DISTRICT reviews. An additional 365 days are allotted for FEMA review
and approval.
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Scope of Work 8-8-07
TASK 1 – PROJECT MANAGEMENT
1.1
Within fourteen (14) days of the NTP, the CONSULTANT will submit a project schedule to the
DISTRICT’s Project Manager showing meetings and completion dates for each task identified in
the Scope of Work (SOW). The CONSULTANT will update this project schedule when
appropriate.
1.2
The CONSULTANT will participate in regular progress meetings with the DISTRICT's Project
Manager. The CONSULTANT is responsible for the minutes for all meetings.
1.3
The CONSULTANT will submit monthly progress reports at the time of the submittal of the
monthly invoices. The progress reports may be submitted electronically.
1.4
The DISTRICT will be responsible for placing the legal advertisement at the beginning of the study.
The advertisement will be run twice, one week apart, in a widely circulated newspaper. Also, if a
local newspaper serves the area being studied, the DISTRICT will also place an advertisement, to
run twice, in the local newspaper. After the newspapers run the ad, the DISTRICT will supply the
CONSULTANT with the original affidavit of publication from each newspaper for each day that
the ad ran.
1.5
The CONSULTANT will notify property owners located within close proximity of study
watercourses by regular mail and obtain any necessary Rights of Entry for the study area, using a
list of property owners furnished by the DISTRICT. The CONSULTANT will furnish the
DISTRICT with a sample of the Notification/ Right of Entry letter.
1.6
When the results of the study are known, the CONSULTANT will notify property owners located
within close proximity of study watercourses by regular mail, if applicable, regarding the
floodplain boundary delineations. The CONSULTANT will furnish the DISTRICT with a sample
of the notification letter and a list of expected mail recipients.
TASK 2 - DATA COLLECTION
2.1
The CONSULTANT will collect and review pertinent data provided by the DISTRICT, FEMA,
ADWR and other sources. Data to be collected will include previous flood hazard reports and
hydrology for the study area, existing topographic mapping, readily available historical flooding
information, as-built plans for existing structures, relevant storm drain infrastructure information,
and drainage design reports for the adjacent roadways, FEMA Flood Hazard Boundary Maps,
FEMA Letters of Map Amendment/Revision, and other pertinent information.
2.2
The CONSULTANT will contact officials from the COUNTY transportation departments to obtain
information on current and planned public works projects, channel modifications, storm-drainage
systems, significant development in the watershed, and corporate limits.
2.3
A data collection summary report will be submitted to the DISTRICT for information purposes. A
preliminary draft report will be submitted to the DISTRICT within (45) days of the NTP. The final
report will be included in Appendix A of the Technical Data Notebook.
TASK 3 - TOPOGRAPHIC MAPPING
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Scope of Work 8-8-07
3.1
As required for the floodplain delineation, the CONSULTANT shall use the existing Digital
Terrain Model and topographic mapping. The elevation contour interval for the topographic
mapping is 2 feet and the horizontal scale is 1 inch = 100 feet.
TASK 4 – SUPPLEMENTAL FIELD SURVEY
4.1
Mapping and surveying ground control for floodplain delineation shall meet current FEMA
minimum criteria as defined in FEMA’s Guidelines and Specifications for Flood Hazard Mapping
Partners, April 2003.
a. Horizontal control will be on the Arizona Coordinate System Central Zone 1983 North
American Datum (NAD), and the vertical control will be on the North American Vertical
Datum of 1988 (NAVD 88). Documentation of how it was derived shall be included in the
Technical Data Notebook.
b. Additional road profile and cross-section data as specified by the DISTRICT will be collected
by GPS RTK methods and will meet the technical requirements of the project.
c. The CONSULTANT shall incorporate existing control points from surrounding studies into the
ground control for the existing study if applicable.
d. Any permanent markers will be set flush to the ground.
4.2
The CONSULTANT shall verify the accuracy of the mapping by the procedures called for in
FEMA’s Guidelines and Specifications for Flood Hazard Mapping Partners, April 2003, or other
methods approved by FEMA. This shall include the verification of cross sections used in the
floodplain delineation.
4.3
Field surveys of significant hydraulic structures not previously obtained, and significant stormwater
storage basins will be obtained by the CONSULTANT when as-built plans are not available. This
information will be compiled into an 11"x 17" (maximum size) drawing for inclusion in the final
report.
4.4
The CONSULTANT shall prepare a Survey Report for this study. This will be included as a part of
the TDN. Copies of the survey field books and office calculations must be included in the Technical
Data Notebooks.
TASK 5 - HYDROLOGY
5.1
The CONSULTANT shall revise the existing hydrologic model to include the rainfall predicted by
the NOAA Atlas 14. The results of this updated hydrologic model will be used for the floodplain
delineation. All calculations and assumptions used in developing sub-basin and routing parameters
shall be documented and made a part of the TDN.
5.2
The CONSULTANT will conduct a field reconnaissance of the study area to ensure the hydrologic
model is still representative of the conditions of the watershed.
5.3
The Hydrologic Report
5.3.1 The findings of the hydrologic study will be presented in Section 3 of the Technical Data
Notebook and will be prepared in accordance with ADWR State Standards Attachment 1-90
(SSA 1-90). The report will be organized as specified by the DISTRICT, following SSA 190 format.
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Scope of Work 8-8-07
5.3.2 Tables and Figures for the appendices:
a. Topographic base map(s) showing the sub-basins, routing reaches, Tc flow paths or lag
flow paths, major man-made structures, and references (i.e., street names, Township,
Range, Section, etc.) at a scale of 1 inch = 1000 feet (or an appropriate scale), on 24 in.
by 36 in. sheets.
b. Soils map(s) at the same scale as the base map (with References).
c. Land use map(s) at the same scale as above (with References).
d. Schematic map for the HEC-1 showing the topography, sub-basins (area, Tc), the flow
paths, the routing reaches (length, slope, friction, width, velocities, transmission losses,
etc.), order of combining the hydrographs, channel, pipe or culvert dimensions (where
appropriate). The final version of the HEC-1 schematic shall include peak discharges
for the 100yr-24hr storm event at major concentration points.
e. Pertinent data on all the structures in the watershed (such as spillway elevation, rating
curves, etc.).
f. One set of study maps (i.e., sub-basin boundary maps, flow path maps, soils maps, land
use maps) to be folded and delivered in a binder.
5.12.3 All calculations, assumptions used in developing sub-basin and routing parameters shall be
documented and made a part of the appendix for the hydrologic report.
TASK 6 - FLOODPLAIN DELINEATION
6.1
Floodplain delineations will be conducted using methodology as outlined by FEMA. The
CONSULTANT will prepare the study using the guidelines established in FEMA’s Guidelines and
Specifications for Flood Hazard Mapping Partners, April 2003.
The CONSULTANT shall provide the DISTRICT review submittals at each of the following steps:
a.
b.
c.
6.2
Draft field reconnaissance section of the TDN and estimation of Manning's "n" values.
Proposed location and alignment of the cross sections.
Approximate floodplain delineation.
The delineation work shall meet requirements for floodplain delineations as prescribed by FEMA
and the Arizona Department of Water Resources. The mapping scale shall be 200’ per inch or as
approved by the District. The hydraulic modeling and delineation work maps shall be in the North
American Vertical Datum of 1988 (NAVD 88). The delineations shall be based upon the final
results of the hydrologic study.
6.3 Field Reconnaissance
6.3.1
The CONSULTANT shall conduct a field reconnaissance of the study area. This will
include observation of channel and floodplain conditions for estimating Manning's "n"
values; photographic documentation of floodplain characteristics; determination of
channel bank characteristics; observation of possible overflow areas; observation of
levees or other structures in the floodplain.
6.3.2
Manning’s "n" values are to be determined using the methodology in the USGS report,
Estimated Manning's Roughness Coefficients for Stream Channels and Flood Plains in
Maricopa County, Arizona, April 1991. Manning’s Roughness Coefficients will be
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Scope of Work 8-8-07
presented for typical reach types observed in the project area, rather than specific reaches
of specific named watercourses.
6.3.3
6.4
Cross Sections
6.4.1
6.5
Representative “n” values for each typical reach type will be selected. The
reconnaissance report will present the determination of channel and over bank "n" values
using captioned color photographs or color photocopies for each identified reach type in
the project area, and the extents of the typical reach types shall be displayed on an aerial
photo exhibit. The report will also discuss floodplain conditions affecting the
delineation, describe structures and obstructions, and provide color photos or photocopies
of major hydraulic structures. Photo locations for channels, structures, and "n" value
determinations will be displayed on reduced scale mapping and included in the Final
Report
The CONSULTANT shall develop cross sections for the study watercourses. Cross
section placement locations shall be selected with respect to existing structures such as
roads, railways, drainage features and confluences. Cross section spacing shall be
approximately 500 feet and done in such a way as to minimize computational head losses
and where natural grade breaks occur as defined by thalwag profile plots. Cross section
stationing will be from left to right looking downstream. Identification of cross sections
will be in river miles, increasing upstream from the confluence with major drainages. The
stationing will begin at the downstream end with the stationing of the existing mapping.
The cross sections may need to be re-oriented or altered after running the HEC-RAS
model to ensure that they are perpendicular to flow per FEMA criteria. Cross sections
developed by the HEC-RAS interpolation feature are not to be used.
Floodplain Delineation/HEC-RAS Modeling
6.5.1
The floodplain delineation shall be based on the updated final discharges from the revised
2002 hydrologic study as directed by the DISTRICT.
6.5.2
The CONSULTANT will develop a HEC-RAS model and delineate approximately 11 miles
of Zone AE (or appropriate zone designation) floodplain with floodway based upon the final
results of the existing hydrologic study as directed by the DISTRICT.
Floodways are to be determined using method 4 or 5 with equal conveyance encroachment
to start with, but only encroachment method 1 will be used in the final analysis. The
floodway encroachment should produce a rise in the water surface elevation that is as near
the one-foot maximum as possible.
6.5.3 The hydraulic effects of bridges and culverts should be incorporated into assessing the
floodplain around such structures. The Zone AE limits must be determined according to
FEMA criteria and clearly labeled on the final drawings. Minor conveyance structures such
as small culverts (i.e., less than 30” in diameter) or structures considered likely to become
clogged during the 100-year peak discharge shall not be included in the hydraulic analyses.
Floodplain may be required to be assessed for elevated structures using the “with and
without” scenarios. In these cases the existing conditions model will serve as the “with”
structure model. For the “without” structure model the topography will be modified to
removed the elevated structures.
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Scope of Work 8-8-07
6.5.4 The CONSULTANT and the DISTRICT shall conduct a field trip to review the results of
the Floodplain Delineations.
6.5.5 The main project description box of the HEC-RAS models should include the following:
a. Project Name and FCD Contract Number
b. Consultant(s) and Modeler's Name(s)
c. File Name and latest run date/final date if completed
d. Vertical Datum of the model, base map date, and base map contractor information
e. Source of the peak discharges used in the hydraulic analysis
In addition, minor descriptions should be added to the model for hydraulic sections located
above and below drainage structures, at section lines, at major transportation crossings, and
at confluences. Model descriptions should be added for culverts and lateral structures, and at
any other feature considered more important to the modeling.
6.5.6 The CONSULTANT shall review the output of the HEC-RAS computer model to ensure the
flow depths and velocities are reasonable and realistic with those expected in this watershed.
The use of separate modeling software such as FlowMaster may be used for this review.
6.6
The CONSULTANT shall provide work maps on base maps from the 2002 West Chino ADMS
Study. The work map drawings will be 24" X 36" in size. The work map scale shall be 1”=200’.
Flood Zones must be determined according to FEMA criteria and clearly labeled on the work maps.
A cover sheet will be part of the work-study drawings and shall include the project title, source and
date of topographic mapping, and a location map showing geographic range covered by each
specific mapping sheet. Each drawing will include the watercourse names and floodplain
boundaries, floodway boundaries, a north arrow, scale, section corners, current streets and highway
names, Horizontal and Vertical Datum references (State Plane Coordinate System, NAD 83, and
NAVD 88), any DISTRICT monument labels located within individual sheet boundaries, major
drainage features, corporate boundaries, hydraulic cross section lines, channel station ceterline,
index map, base flood elevations (BFE), ,peak discharges at concentration points, and Section,
Township, Range for each watercourse delineated.
6.7
Technical Data Notebook
6.7.1 The findings of the floodplain delineation study will be presented in Section 5 of the
Technical Data Notebook and will be prepared in accordance with ADWR State Standards
Attachment 1-97 (SSA 1-97). The report will be organized as specified by the DISTRICT
standards, following SSA 1-97 format.
6.7.2 The Hydraulic analysis/HEC-RAS output of the Technical Data Notebook, in addition to
summary tables and full output report, should include fully labeled cross section plots.
Section plots should be grouped per study reach, and reach groups should be separated and
then indexed within the main report to expedite data recovery.
6.8
The CONSULTANT shall fill out all the forms required by FEMA for the submittal of a Floodplain
Delineation Study.
TASK 7 – FLOODPRONE STRUCTURES
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Scope of Work 8-8-07
7.1 Following the re-delineation of floodplains, the CONSULTANT shall provide the DISTRICT with a
list of buildings that remain within the floodplain.
TASK 8 – PUBLIC INVOLVEMENT
8.1
The CONSULTANT shall prepare for and attend a public meeting when results of the new
delineations are known and prior to the submittal to FEMA. The public meeting will present the
proposed delineations. The CONSULTANT shall provide graphics and exhibits for the public
meeting. The DISTRICT will provide addresses for mailings and the CONSULTANT shall send
notifications to property owners and secure the meeting location. Copies of all
advertisements/notices, and any public comments shall be included in the TDN. The meeting notice
may be sent with the results letter sent to property owners within a close proximity of the study
watercourses. The CONSULTANT shall be prepared to take public comments and organize and
include them in the TDN.
TASK 9 – DELIVERABLES
The CONSULTANT shall prepare for and provide the following deliverable items for this
project:
9.1
Pre-FEMA Submittal: The CONSULTANT will deliver the following items to the DISTRICT for
review and approval:
9.1.1. Three (3) sets of blackline topographic base maps with floodplain delineations.
9.1.2. Three (3) copies of the draft Technical Data Notebook, including completed FEMA forms,
annotated Flood Insurance Rate Maps, HEC-1 and HEC-RAS (if used) model results (on
diskettes).
9.2
FEMA Submittal: Following the DISTRICT’S review and the incorporation of comments into
the study documents, the CONSULTANT will submit the study to FEMA. A copy of the items
submitted shall be provided to the DISTRICT. All of the following products are deliverables for the
FEMA submittal:
9.2.1 One (1) complete set of blackline paper topographic base maps with the floodplain
delineations shown. All drawings will be signed and sealed by persons of appropriate
professional registration(s). Each registrant will provide a specific statement as to what
service they performed.
9.2.2 One (1) complete copy of the Technical Data Notebook, including completed FEMA forms,
annotated Flood Insurance Rate Maps showing the proposed delineation, HEC-1, and HECRAS input/output files on diskettes. The notebook will be organized as specified by the
DISTRICT, following SSA 1-90 format.
9.3
Final Submittal: The following products are the deliverables for the final submittal to the
DISTRICT after FEMA approval is issued:
9.3.1 One (1) complete set of Mylars and three (3) complete sets of sealed blackline paper
topographic maps with the floodplain/floodway delineations shown. All drawings will be
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Scope of Work 8-8-07
signed and sealed by persons of appropriate professional registration(s). Each registrant will
provide a specific statement as to what service they performed.
9.3.2 All remaining hydrologic and floodplain delineation data in conformance with the contract
specifications.
9.3.3 Three (3) complete copies of the Technical Data Notebook including HEC-1 input/output
files on diskettes. The Technical Data Notebook shall include any correspondence and/or
meeting minutes with the reviewing agencies and shall reflect any revisions required by
those reviewing agencies. Revisions may include, but are not limited to, addressing FEMA's
comments, modifications to the delineation maps, the HEC-1 model and/or the Final Report.
9.3.4 Three (3) electronic copies of the TDN report on CD's as pdf files.
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Exhibit A (Fee Schedule)
Yavapai County Flood Control District
FLOODPLAIN DELINEATION STUDY
CONSULTANT/SUBCONSULTANT ESTIMATED
LABOR HOURS AND DIRECT LABOR COSTS
August 14, 2007
LABOR-HOUR ESTIMATE
Estimated
Fee
Tasks
Task 1
Project Management
$
13,243
Task 2
Data Collection
$
12,403
Task 3
Topographic Mapping
$
-
Task 4
Field Survey
$
10,617
Task 5
Hydrology
$
18,787
Task 6
Floodplain Delineation
$
93,373
Task 7
Floodprone Structures
$
2,968
Task 8
Public Involvement
$
6,518
Task 9
Deliverables/FEMA
Submittals
$
24,786
$
4,220
Total Lump Sum Project Cost $
186,915
Direct Expenses
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