wilson & co. topo maps s.e. salina1
December 29, 1976
TO: Norris Olson, City Manager
FROM: Dean Boyer, City Engineer
SUBJECT: Topographic mapping of area within the City flood protection
works, south and east of the city for the purpose of planning
interior flood protection.
After interviewing the two local firms which have mapping capabilities
to perform the above subject work and reviewing the,proposals,submitted by
them, I would offer the following recommendation. I would feel more
comfortable with and would recommend approval of the proposal from Wilson
& Company, Engineers & Architects.
My reasons for the above recommendation is as follows:
(1.) I feel if we need a consultants service in the,
planning and design of the flood protection,
we should work with the same firm that produced
the maps;
(2.) I think Wilson & Company, Engineers & Architects
has the superior expertize in the fields of
hydraulics and hydrology;..and .
(3.) Wilson & Company, Engineers & Architects.designed
our flood protection works and should,be totally
familiar with integrating an interior drainage
plan with said works; and
(4.) I think it is logical
that Wilson & Company,
proposal be accepted.
DB:MKP
from reasons 1, 2 and 3
Engineers & Architects
Respectfully submitted,
c
LS O N
COMPANY
ENGINEERS
ARCHITECTS
Bal EAST CRAWPORO AVENUE
17 December 1976
Dean L. Boyer, P.E.
City Engineer
300 W. Ash
Salina, KS 67401
Re: Aerial Mapping
Southern Drainage Areas
Salina, KS
Dear Mr. Boyer:
P.O. BOX 20
■ SALINA. KANSAS 67401
918 027-043a
ENGINEERS
ARCHITECTS
PLANNERS
This letter is Wilson b Company's proposal for the topographic mapping
of certain areas in and adjacent to the City of Salina. The mapping is
to provide the basis for a study of the drainage areas and the preparation
of an overall drainage plan for the developing areas of South Salina.
The extent of the areas to be mapped is shown on the attached Exhibit
"A". The area encompasses approximately 6,400 acres.
The aerial mapping services are described as follows:
FIELD CONTROL
We propose to target on the ground a sufficient number of points to
utilize for the horizontal and vertical photo control. If adequate
reference ties are available, we propose to use section and quarter -
section corners for as many of the required control points as possible.
Following the targeting of the control points,.we will perform the
necessary field surveys to obtain the required.horizontal and vertical
photo control data. Vertical control will be established using sea -
level datum, 1929 adjustment. As a part of the level work, we will
establish bench marks at appropriate intervals along the level circuit
runs required for the vertical control. The horizontal control will be
accomplished on a local grid system established for the project. The
surveying instrumentation we will employ for .the field control includes
Wild NA2 and Zeiss N12 automatic levels, Wild T-2 one -second theodolites
and Geodimeter Model 76 and Tellurometer Model CA1000 electronic distance
measuring instruments. The precision and accuracy of the survey work
will be in accordance with standards adopted by the National Geodetic
Survey for third -order surveys (1:5,000).
BALINA. KANSAS ■ WICHITA. KANSAS 0 ALBUQUERQUE. NEW MEXICO
V
Dean L. Boyer, P.E.
17 December 1976
Page 2
AERIAL PHOTOGRAPHY
As soon as.the control point targets are in place, we will obtain vertically
exposed, precision aerial photography of the project area. Photography,
exposed from an altitude of 3,000' above average ground, will be taken
for the::develapment.of:the.end product identified in this proposal. The
photography will be exposed with our Zeiss, RMK A 15/23.precision aerial
mapping camera,.having a 6 -inch focal length. One set of double -weight
matte contact prints of the project photography will be provided the
City.
PHOTOGRAMMETRIC MAPPING
The photogrammetric process known as aerotriangulation will be employed
to supplement the basic field control and.provide control points for map
compilation. The aerotriangulation procedures permit the analytical
determination,of supplemental control _points utilizing our precision
photogrammetric instruments and digital electronic computer, and reduce
the amount of field survey work required. The stereo plotting work will
be performed on our three Wild B-8 Aviographs; precision aerial plotting
instruments.. The map will be prepared at a horizontal scale of 1"=100'
with a 2 -foot contour interval. In flat areas,.where 2 -foot contours
would be widely spaced on the map, we propose to provide supplemental
one -foot contours to help define the lay of the land. In addition, spot
elevations will be shown to define isolated tops and depressions and
certain critical points.
The accuracy of the contours will be to National Topographic Map Accuracy
Standards, that is, at least 90% of all contours shall be within one-
half contour interval of true elevation, with no contour more than one
full contour interval from true elevation. For this project, the accuracy
of the contours will be 902 within 1 -foot (one-half contour interval)
and none more than 2 -foot in error. The same criteria will apply to the
one -foot supplemental contours since they will be compiled from the
aerial photography exposed for a two -foot contour map.
MAPPING EXHIBITS
Base mapping exhibits will be prepared to cover the area delineated on
the attached exhibit. Each base map will cover one quarter.section of
land (1/2 mile.x 1/2 mile). The exhibits will be prepared as a reproducible,
enlarged, half-tone,.dimensionally ratioed and rectified photo -plan
prepared from the aerial photography. Photographic Cronaflex, a stable
base material, will be used for the reproducibles. The overall gross
sheet size will be 30" x 36".. The horizontal scale of the photo -plan
will be 1"=100', and superimposed on the plan will be the 2 -foot basic
and 1 -foot supplemental contours compiled on the plotters.
TF
I L S AO N
COMPANY
momeeR5
RC RITECTS
A _
Dean L. Boyer, P.E.
17 December 1976
Page 3
An index sheet will be prepared to delineate the location of each exhibit
and its relationship to adjoining exhibits.
In addition to.the exhibits previously described, we will prepare an
overall exhibit of the project area. The exhibit will also be a photo -
plan reproducible on photographic Cronaflex.as outlined for the base
mapping exhibits. The exhibit will have a horizontal scale of 1"=500'
and will have the.contours developed for the base maps superimposed on
the photo -plan. The size of the overall exhibit will be approximately
3' x 6'.
We will provide the City with one (1) set of the final reproducible
mapping exhibits described herein.
COMPLETION TIME
We are in an excellent position to advance the work upon your acceptance
of our proposal and authorization to proceed. We would expect to complete
all mapping services within 150 calendar days from your authorization.
REMUNERATION
Our charge for the services outlined in this proposal is $38,400.00.
The service chargeincludesfull compensation for direct labor, general
overhead, materials and.related costs as.well as.anticipated profit. We
propose to receive the service charge in monthly installments over the
life of the contract based on the progress of.the work. A satisfactory
method of determining progress will be reviewed and approved by the
City.
To provide for.additions to,. or deletions from the mapping area.outlined
in this proposal, we quote a unit price of $6.00 per acre for such
changes. The unit price will be applicable to all changes in the mapping
area as long as the final area is neither increased nor decreased by
more than 15% of.the project area outlined on Exhibit."A". Changes
resulting in more than 15% of the original area will necessitate renegotiation
of the contract amount.
We would like to.point out that we have an in-house staff of hydrologists
and hydraulic engineers who have expertise in.the field of surface
drainage. The staff is available to assist the City in the study and
development of a.drainage plan for the project area and the engineering
design of proposed improvements. The staff would.be able to utilize the
intermediate data acquired during the development of base mapping exhibits.
The added data would be helpful during the study and related design. A
satisfactory agreement.for the services can be negotiated at the time
the City desires such assistance and a definitive scope of work is
available.
CTA
ANY
COMPANY
ENOINE"S
0.CNITECTN
A - _
Dean L. Boyer, P.E.
17 December 1976
Page 4
If the arrangements for the aerial mapping services as outlined are
agreeable, would you.so indicate with the appropriate signature in the
space provided at the end of this letter. Please retain the original
copy for.your file and return the signed carbon copy to us.
Thank you for contacting Wilson & Company regarding the aerial mapping
services. We trust the scope of work as outlined has interpreted
correctly the City's needs and requirements. We look forward to receiving
your notice to proceed.
I94YIli3 e r =Iwg
Richard S. Worrel, P.E.
APPROVED: CITY OF SALINA, KANSAS
Date
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