HomeMy WebLinkAbout750732.tiff AGREEMENT FOR FLOOD PLAIN MAPPING
SERVICES FOR WELD COUNTY, COLORADO
This agreement made as of the 15th day of July, 1975, between Weld
County, Colorado, hereinafter called the COUNTY, and Hogan and Olhausen,
P.C. , hereinafter called the ENGINEER, Witnesseth, That whereas the COUNTY
has called for bids for engineering services to prepare photogrammetric
maps and valley cross sections of portions of the Big Thompson River as
outlined on the attached map labeled exhibit "A" and according to the
specifications of the Colorado Water Conservation Board attached hereto
and labeled exhibit "B" , and Whereas the ENGINEER has prepared a letter
of proposal dated May 23, 1975, attached hereto and labeled exhibit "C" ,
which describes alternate techniques and equipment and modifies certain
sections of the specifications in exhibit "B".
NOW, THEREFORE, the COUNTY and ENGINEER for the consideration
hereinafter set forth in schedule "A" agree as follows:
The ENGINEER will prepare the required maps in accordance with the
maps and specifications described in exhibits "A", "B" and "C" with the
following schedule of costs.
SCHEDULE "A" COST SCHEDULE
1 - Flying and Photography $ 652.50
(The Engineer will provide three sets of
stereo contact prints to the County along
with their respective index map)
2 - Ground Control Survey for Mapping 2,200.00
3 - Topographic Mapping with Orthophoto Background 8,240.00
(The Engineer will provide two sets of finished
mylars and three sets of black and white
prints to the County along with their re-
spective index map)
4 - Dimension Culvert and Bridge Structures 750.00
5 - Field Survey 5 Cross Sections 500.00
6 - Digitize 100 Cross Sections 600.00
7 - Set 6 Permanent Monuments 300.00
TOTAL $13,242.50
Time of completion 120 days.
In addition, the ENGINEER will retain a local person to contact
landowners and obtain permission to survey on behalf of the COUNTY. In
750732
P ' v
L P905
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event permission to survey is not granted, the COUNTY will furnish
assistance in gaining entry to the land.
In executing this agreement and in performing this agreement the
ENGINEER is an independent contractor and none of the ENGINEER'S employees
or agents are, or will be considered to be, employees of the COUNTY.
This agreement shall extend to and be binding upon the successors
and assigns of the respective parties.
WELD CO NN/TY
BY.i� "Lai 4^ -16r
Glenn K. Billings, Chairman
£ SFSC
is or acobucc
(SEAL)
ATTEST:
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.l� / 1 � YL µ'�� 'YC.- / c.jJt{
\ / // HOGAN AN 0 I'USEN, .
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p//S`//f 7S`
Secretary
-2-
COLORADO WATER CONSERVATION BC ._D February 1975
Specifications for Aerial Surveys. and Mapping by
Photogrammetric Methods for Flood Plain Studies
The contractor shall consider the terms of these specifications binding
unless otherwise provided in the letter of instruction. The contractor agrees
to provide all materials and labor, and should obtain the rights of ingress and
egress for the performance of work as delineated by the client; however, should
special conditions exist posing difficulty in the performance of the work, the
client will assist.
• 1. TARGETING PRIOR TO PHOTOGRAPHY
A. The panels (targets) dimensions shall be sized so as to be visible on
the stereo aerial 9" x 9" contact prints.
B. The procedure for placement of the panels for 2' contour mapping shall
be at 900 feet for the respective mapping widths:
Ma in Width Mapping Width
0' - 3000' 3000' - 6000'
0' - 100' • 0' - 100'
+ + + I + f +
� I
+ T+ + + NI -r-+
900' ml �I 900'
,-�
Common To
Both
+ + Flight Lines •
I +
The panel locations shall be placed approximately in line and perpendicular
with the floodplain.
Note: The distance between panels shall be 900 feet with an accuracy tolerance
of 50 feet from the preceeding panel.
C. Each panel shall be re-checked immediately prior to the time of aerial
photography.
D. Maximum contrast between a panel and its background is a primary
consideration.
2. AERIAL PHOTOGRAPHY
A. Provide stereo aerial photography at a scale as shown in Table 1 for
the respective contour interval requested by client for the area defined
on the enclosed map. The photography should be centered on the mapping
area as well as possible because of the potential need for additional
mapping if the defined area is not adequate. The aerial photograph
centers shall be shown on the finished mapping with their respective
numbers.
S. All photography shall be taken with a camera which meets the specifi-
cations for single lens Precision Aerial Mapping Camera, the specifi-
cations of which are to be equal to or exceed a Zeiss Aerotopograph
Survey Camera Type RMK 15/23, 6" focal length lens. The contractor
shall furnish a camera test report. The report shall be' prepared by
a testing organization or government unit which is acceptable to the
client and a test report must be submitted to and approved by the
client for each camera prior to its use. The report shall be based
on tests and measurements made after final assembly or reassembly of
all parts of the camera cone unit with the required filter in place,
which in the case of the 6" focal length lens camera is of the anti-
vignetting type.
C. Photography shall be undertaken only when well-defined images can be
obtained. Photography shall not contain shadows caused by topographic
relief and sun angle, whenever such shadows can be avoided during the
time of year the photography must be taken. Photography shall not be
undertaken when the sun angle is less than 30 degrees above the horizon.
-2-
D. The aerial negatives and photographs for the entire area to be mapped
shall have the following overlap:
a. End lap shall be 607. + 5%
b. Side lap between adjacent flights shall be 30% ± 10%
E. Provide three sets of 9" x 9" contact prints on double weight semi-
matte paper from the above negatives along with their respective index
F. Specifications for drab, drift, tilt shall be as defined in "Specifi-
cations for Aerial Surveys and Mapping by Photogrammetric Methods for
Highways" 1968.
G. Photography shall meet the specifications as defined in the national
map accuracy standards asset forth in the United States National Map
Accuracy Standards, Revised June 17, 1947.
3. QUALITY OF NEGATIVES AND PRINTS
Exposing and processing of all photographic materials shall be done
in conformance with manufacturers recommendations.
A. Photographic Quality - Negatives and prints shall be clear and sharp
in detail and of normal density and fine grained quality. Negatives
of medium or normal density requiring moderate printing time, without
sacrificing detail or contrast, are required. Negatives and prints
shall be free from streaks, oil stains, static marks, clouds, cloud
shadows, smoke, haze, snow, excessive shadows and other deficiencies
which would interfere with their intended use. Reducing or intensi-
fying of negative will not be permitted.
-3-
B. Physical Quality - special care shall be exercised in processing all
photographic materials to insure freedom from chemicals, stains,
tears, scratches and water narks, finger marks, lint, dirt, and
other physical defects. Before, during, and after drying, the nega-
tives and prints shall not be rolled tightly on drums or in any way
stretched, buckled, distorted or exposed to excessive heat. After
fixation, all negatives and prints shall be thoroughly washed to
insure freedom from residual hypp and other chemicals which might
impair permanency. Txcessive moisture should be removed immediately
after washing. Double weight semi-matte prints or equivalent shall
be immersed in a print flattering solution (Kodak, BPI-20, or equal)
between prints t<ashing and air. drying.
4. GROUND CONTROL
A. Provide horizontal and vertical ground control necessary for the
•
required map accuracy by instrument survey methods. The vertical
ground control and contour designation shall be based on United
States CoastGuard and Geodetic Survey (USC & GS) or United States
Geolo;ical Survey (USES). Mern Seal Level Datum (MSL) adjusted to
the most recent date of record. The horizontal ground control shall
be based on a minimum of two USC & GS triangulation stations or equiva-
lent tied to the Lambert Conformal Conic Projection for establishment
of the Colorado Grid Coordinate System within the project area. The
order of accuracy for :canning-in the basic control for the project
area shall ccmmensura.te with the control accuracy already set on the
reference morucierts (vertical or horizontal). Within the project
area, the field surveys shall be of third order accuracy for vertical
-4-
control and _de error of closure shall not ex_eed 1: 20,000 for
horizontal control.
B. Provide one (1) set of values in tabular form for all monuments set
within project area showing vartical elevations related to USC & GS
USGS MSL datum and with horizontal coordinates' used for the establish-
ment of the Colorado Grid Coordinate System.
C. The client may require the contractor to permanently set monumen-
tation for vertical and horizontal control. When required, the monu-
ments shall be brass caps firmly affixed to permanent structures,
rock outdrops, or by setting in the top of concrete monuments extend-
ing into the ground to a depth of 36 inches.
5. TOPOGRAPHIC MAPPING
A. Client shall specify the kind of map which shall be either a line map .
showing contours and topographic features or one showing contours
. with a rectified, scaled, photographic background.
B. The finished topographic map shall be on 4 mil mylar or equivalent
and shall be prepared by the scribing method at the specified scale
and contour interval. The mapping shall be compiled at the scale
designated in Table 1.
TABLE 1
Contour Scale Of Stereo Aerial Scale Of
Interval 9" x 9" Contact Prints Mapping Compilation
1' 1 : 3000 1 = 50'
2' 1 : 6000 1 = 100'
4' 1 : 8000
1 = 200'
5' 1 : 12000 1 = 200'
-5-
C. All physica natures within area specif. by the contract in-
eluding buildings, fences, trees, roads and streets, sidewalks, power
poles, irrigation ditches, reservoir and all other features that are
discernable on the aerial photographs shall be shown on the map. Physi-
cal features that are referenced by a respective name shall be so labeled
on the finished map (Example: Street names, etc. ).
D. Contractor shall perform all mapping to comply with these standards, and
carry the statement. "This map complies with the National Map Accuracy
Standards." Ninety percent of all contours shall be within one-half
contour interval and the remaining ten percent shall not be in error
by more than one contour interval. In, areas where the ground is com-
pletely obscured by dense brush or tree cover, contours shall be
plotted as accurately as possible from the stereoscopic model while
making full use of spot elevations obtained where the ground is visible.
•
Ninety percent of the planmetric features shall be plotted to within '
• 1/40" as measured at the map scale and the remaining ten percent shall
be plotted to within 1/20".
E. All permanent and semi-permanent monuments used for the mapping instru-
ments surveys shall be shown and their respective elevations labeled
•
on the map.
F. When the map distance between contour lines exceeds 1" in spacing,
additional spot elevations from the plotter shall be shown in the
flat area.
G. Upon completion of the compilation the contractor shall furnish the
client with either a sepia copy or three blue line copies of the
pencil manuscript as requested.
H. All' maps are to be photographic reproduced mylar .positives from the
scribed negatives rather than a direct positive mylar reproduction.
—6—
•
6. CROSS SECTIu..6
A. Field Surveys
1. Provide the vertical aad horizontal coordinates for the starting
point for the cross ae;;tional surveys for the centerline of road-
ways and streets crossing the channel and floodplains within the
designated mapping area. Cross section points shall be taken at
100. foot stations plus breaks except that the total number of
ground survey points shall not exceed 100. The starting point
shall be keyed to photographs.
2. Provide spot elevations at:
a. All intersections of the centerlines of streets/roads
with the centerlines of streams.
b. Upstream and downstream inverts of culverts/bridges.
c. Stream bottoms upstream and downstream from culverts/bridges.
d. The low points of streets if they are different from those
at the intersections with the centerlines of streams.
3. Provide a sketch for each culvert/bridge in the mapping area
in sufficient detail to determine the waterway area of the
structure and the amount of fill over the structure.
B. Digitized cross sections.
1. The client will locate approximately 100 cross sections which
are to be photogrammetrically measured for the elevations and
horizontal distances along located lines. The data shall be
furnished on IBM punched cards in a format as designated by the
client. In addition, a printed tabulation shall be furnished to
the client showing the vertical and horizontal values. The
starting point and 100 foot stations shall be keyed to 6. A. 1.
The location of all cross sections shall be as specified by the
client on one set of aerial photographs (Example: In the case of 2'
.mu-.
con. .r mapping, the cross sectional ,cations would be shown
on aerial photographs at a scale 1" = 500' ). The total number
of ground points shall not exceed 100.
2. When compiling, the mapping contractor shall provide the vertical
and horizontal data points obtained photogrammetrically for the
identical points and locations as defined in 6. A. 1.
3. Ninety percent of all spot elevations placed on the maps and
cross sections shall be accurate within one-fourth (y) a con-
tour interval, and the remaining ten percent shall be accurate
within one-half (1) a contour interval.
7. BIDDING
A. The cost for services shall be submitted by the following schedule:
1. Flying and photography 652.50
2. Ground control survey for mapping 2,200.00
3. Topographic mapping, finished draft on mylar,
at specified scale and contour interval 8,240.00
4. Dimensioning of culvert and bridge structures 750.00
5. Field surveyed cross sections 500.00
6. Digitized cross sections 600.00
7. Cost of placement of monuments, if requested 300.00
Total Fee Not To Exceed 13,242.50
B. Additional Cost data
1. Should the client desire to expand or reduce the mapping
contract to meet additional work or budgetary requirements, it
will be necessary that the contractor furnish unit cost break-
downs for work to be performed. These costs should include all
items necessary to completely execute a change order such as
model set up, a per acre cost for compilation, a per acre cost
for scribing and other pertinent features at a per acre cost.
-8-
8. TIME OF PERFORMANCE
Mapping contractor's time for the project will be approximately 16
weeks after notice to proceed. The contractor will deliver phases of the
work according to the following schedule:
A. Aerial photography - by 10% elapsed contract time.
B. Blue line copies - by 80% elapsed contract time.
9. Any items or features not covered in these specifications and relevant to
the client's receiving acceptable aerial surveys and mapping by photo-
graimnetric methods shall be as stated in the "Aerial Surveys and Mapping
by Photogrammetric Methods for Highways" prepared by the Photogramnetry
for Highways Committee of the American Society of Photogranunetry, U.S.
Department of Transportation, 1963.
10. INSPECTION AND APPROVAL
Work performed under this specification shall be subject to inspection
and examination by the client at any place where such work is being
performed. The client shall have the right to reject inaccurate or sub-
standard work at any time. All rejected work shall be satisfactorily
corrected and replaced without cost to the client. As soon as practi-
cable after delivery for inspection, the contact prints, maps and cross
sections will be inspected and checked. The mapping contractor shall
coordinate his operations to permit a reasonable and rapid check of the
work by client in order to assure that the accuracy and quality of work-
manship complies in all respects with the terms and provisions of this
specification.
-9-
1 , May 23, 1975 0 .,
File No. P57-� G�XN-� /T C.71U
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Weld County
U Planning Director
c, 1516 Hospital Road
Greeley, Colorado 80631
Q
Attn: Mr. Gary Fortner
066 1041 Administrator
cc)
OG
Gentlemen:
w The enclosed proposal for mapping of the Flood Plain of the Big
w Thompson River in Weld County is submitted in response to your request
Z of May 12, 1975. I have reviewed the requirements with Mr. Larry Laing
__ of the Colorado Water Conservation Board with regard to variations in
V the specifications to best utilize the equipment we intend to use on
the project. Areas of change and additions to the specifications are
Z as follows: The numbers contained herein relate to the pages and
w numbers of the CWCB specification.
Page 1 : Delete Section 1 and add following:
1 . TARGETING PRIOR TO PHOTOGRAPHY
A. The main stream panels (targets) dimensions shall be sized
so as to be visible on the stereo 9" x 9" contact prints
U without the use of sophisticated equipment. The outside
targets shall be clearly visible in the plotter and may be
at: targets or photo identified points.
Z B. The procedure for placement of the main stream panels shall
w be approximately 2000' intervals along and near the river
u") itself. The remaining outside panels and points shall be
placed or identified so that each photo has 6 strategically ,r
placed points with at least 4 surveyed points visible in o
Q each overlapping stereo area.
0= C. Panels shall be rechecked prior to flight. o r
D. Maximum identification of panels in the photos is a primary
Q consideration.
Page 2:0,65
2. AERIAL PHOTOGRAPHY
Z A. & B. are deleted and the following inserted: The aerial camera
Q used on this project will be the Hogan and Olhausen Zeiss a
U RMKA4-15/23 equipped with 8 fiducial marks. The U.S.
Geological Survey Calibration report for the camera will be
O furnished on request. Additional requirements for photographic
quality, overlap, etc. , shall be in accordance with "Standard
May 23, 1975
Weld County Plc rig Director
File No. P57-75
• Page 2
Specifications for Aerial Photography for Photogrammetric
Mapping", published by the U.S. Geological Survey dated
January 15, 1972. The scale of the photography shall be
1 " = 860' .
Page 5: Delete A & B and add following:
5. TOPOGRAPHIC MAPPING
A. Client shall specify the kind of map which shall either be a line
map showing contours and topographic features or one showing
contours with an orthophotographic, scaled, halftoned background.
B. The finished map shall be on 4 mil mylar base positive photo-
graphic composite of negative scribed stable base material .
Contour compilation and cross sections will be performed on the
Hogan and Olhausen, P.C. Kern PG2 SSL Stereo Plotter. The plotter
is classified by the U.S.G.S. as a "First order compilation
instrument", suitable for compilation of 2' contours from photo-
graphy at 1 " = 1000' with a 6" focal length. This is an equivalent
"C" factor of 3000. We propose to use a "C" factor of 2580, altitude
of 5160' and contact scale of 1 " = 860' for the project. The contour
interval will be 2' and the compilation scale will be 1 " = 200' .
The image viewing scale will be 1 " = 107 ' .
Page 6:
D. Unchanged but with the following addendum:
In the event the photographic background option is selected by
the client, the work will be accomplished on the Hogan and Olhausen,
P.C. "Societe Francais Optique et Mechanique Orthophotographe"
instrument. The accuracy of planimetry will be checked by plotting
appropriate outstanding identifiable planimetric features on the
Kern plotter during the compilation process and comparing the same
by overlaying the two manuscripts. Field checking of elevations
if carried out by the client, shall be performed in accordance with
standard procedures outlined in the "Manual of Photogrammetry" as
published by the American Society of Photogrammetry.
Section 6-8-1 : Change scale of photographs to 1 " = 860 ' .
r7/• ..---, ..---
May 23, 1975
'' Weld County Planning Director
-` File No. P57-75
Page 2
COST SCHEDULE
1 . Flying and Photography $ 652.50
.41
2. Ground Control Survey for Mapping 2,200.00
3. Topographic Mapping
11
With planimetric background (1 ) 8,720.00
With orthophoto background (2) 8,240.00
4. Dimension Culvert and Bridge Structures
15 @ $50.00 750.00
3q 5. Field Survey of Cross Sections (Allowance 5)
:ii Each Cross Section $100.00 500.00
6. Digitized Cross Sections 100 @ $6.00 600.00
7. Monuments 6 @ $50.00 300.00
rc
TOTAL (1 ) $13,722.50
TOTAL (2) $13,242.50
Time of completion - 120 days
Respectfully submitted,
HOGAN & OLHAUSEN, P.C.
R nnie E. Hogan
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May 23, 1975
File No. P57-7.
U•
w
f-
= Weld County o
U Planning Director
1516 Hospital Road
De Greeley, Colorado 80631
Attn: Mr. Gary Fortner
06 1041 Administrator
� V
Gentlemen:
CC
w The enclosed proposal for mapping of the Flood Plain of the Big V,
w Thompson River in Weld County is submitted in response to your request
Z of May 12, 1975. I have reviewed the requirements with Mr. Larry Laing
of the Colorado Water Conservation Board with regard to variations in
U the specifications to best utilize the equipment we intend to use on
the project. Areas of change and additions to the specifications are
Z as follows: The numbers contained herein relate to the pages and
w numbers of the CWCB specification.
Page 1 : Delete Section 1 and add following:
1 . TARGETING PRIOR TO PHOTOGRAPHY
A. The main stream panels (targets) dimensions shall be sized
so as to be visible on the stereo 9" x 9" contact prints
U without the use of sophisticated equipment. The outside
targets shall be clearly visible in the plotter and may be
targets or photo identified points.
Z B. The procedure for placement of the main stream panels shall
w be approximately 2000' intervals along and near the river
itself. The remaining outside panels and points shall be
placed or identified so that each photo has 6 strategically
placed points with at least 4 surveyed points visible in o
Q each overlapping stereo area. < 6
= C. Panels shall be rechecked prior to flight. o
J
D. Maximum identification of panels in the photos is a primary
o consideration.
r
Page 2: ° ,
06
2. AERIAL PHOTOGRAPHY
Z A. & B. are deleted and the following inserted: The aerial camera
Q used on this project will be the Hogan and Olhausen Zeiss
V RMKA4-15/23 equipped with 8 fiducial marks. The U.S.
Geological Survey Calibration report for the camera will be
O furnished on request. Additional requirements for photographic
quality, overlap, etc. , shall be in accordance with "Standard
May 23, 1975
Weld County Plc. ing Director
File No. P57-75
• Page 2
Specifications for Aerial Photography for Photogrammetric
Mapping", published by the U.S. Geological Survey dated
January 15, 1972. The scale of the photography shall be
1 " = 860' .
Page 5: Delete A & B and add following:
5. TOPOGRAPHIC MAPPING
A. Client shall specify the kind of map which shall either be a line
map showing contours and topographic features or one showing
contours with an orthophotographic, scaled, halftoned background.
B. The finished map shall be on 4 mil mylar base positive photo-
graphic composite of negative scribed stable base material .
Contour compilation and cross sections will be performed on the
Hogan and Olhausen, P. C. Kern PG2 SSL Stereo Plotter. The plotter
is classified by the U.S.G.S. as a "First order compilation
instrument" , suitable for compilation of 2 ' contours from photo-
graphy at 1 " = 1000' with a 6" focal length. This is an equivalent
"C" factor of 3000. We propose to use a "C" factor of 2580, altitude
of 5160' and contact scale of 1 " = 860' for the project. The contour
interval will be 2' and the compilation scale will be 1 " = 200' .
The image viewing scale will be 1 " = 107 ' .
Page 6:
D. Unchanged but with the following addendum:
In the event the photographic background option is selected by
the client, the work will be accomplished on the Hogan and Olhausen,
P.C. "Societe Francais Optique et Mechanique Orthophotographe"
instrument. The accuracy of planimetry will be checked by plotting
appropriate outstanding identifiable planimetric features on the
Kern plotter during the compilation process and comparing the same
by overlaying the two manuscripts. Field checking of elevations
if carried out by the client, shall be performed in accordance with
standard procedures outlined in the "Manual of Photogrammetry" as
published by the American Society of Photogrammetry.
Section 6-B-1 : Change scale of photographs to 1 " = 860' .
t ! May 23, 1975
e.. J Weld County Planning Director
File No. P57-75
Page 2
COST SCHEDULE
1 . Flying and Photography $ 652.50
2. Ground Control Survey for Mapping 2,200.00
3. Topographic Mapping
With planimetric background (1 ) 8,720.00
With orthophoto background (2) 8,240.00
4. Dimension Culvert and Bridge Structures
11 15 @ $50.00 750.00
5. Field Survey of Cross Sections (Allowance 5)
Each Cross Section $100.00 500.00
6. Digitized Cross Sections 100 @ $6.00 7. Monuments 6 @ $50.00
600.00
300.00
TOTAL (1 ) $13,722.50
TOTAL (2) $13,242.50
Time of completion - 120 days
Respectfully submitted,
HOGAN & OLHAUSEN,P.C.
....2\p-LC-Cc
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ROonnie E. Hogan r4i
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