HomeMy WebLinkAbout12950 W. 43rd Drive7500 West 29th Avenue The City of
Wheat Ridge, Colorado 80215 Wheat
Telephone 303/ 235-2868 Ridge
FAX 303/235-2857
April 14, 2000
Mr. Thomas Gardner, P.E.
5575 South Sycamore Street, Suite 103
Littleton, Colorado 80120
Re': Lot 5@ 44 Industrial Park,12950 West 43rd Drive - Approval
of Drainage Letter, & Grading/Erosion Control Plan
Dear Mr. Gardner,
This letter is to inform you that the drainage letter, and the
grading/erosion control plan for the above referenced project
have been reviewed and approved for construction. Please be
aware of the following items regarding the construction of the
project:
1. The proposed drainage facilities shall be constructed and
approved by the City of Wheat Ridge prior to issuance of the
Certificate of Occupancy.
2. Erosion control for the project shall be placed in conformance
with the approved drainage/erosion control plan and shall be
maintained as needed during the course of construction.
3. All drainage improvements shall be constructed in conformance
with the approved drainage report and.plan.
4. Upon completion of the drainage improvements the engineer,
Mr. Thomas Gardner, P.E., Paragon Engineering Consultants,
Inc. shall provide to the City of Wheat Ridge a letter of
certification stating that the various improvements, as
defined in the drainage report and plan, have been accurately
surveyed to confirm that their construction is in accordance
with these documents. The certification letter shall be
written and stamped by the engineer who prepared the drainage
report, and shall be submitted for review and approval by the
City prior to issuance of the Certificate of Occupancy.
Mr. Thomas Gardner, P.E.
Paragon Engineering Consultants, Inc.
Page 2
5. It will be the responsibility of the contractor for the
project to repair any damage to the existing public
improvements on West 43rfl Drive as a result of related
construction traffic in the area. Also, the contractor will
be responsible for maintaining West 43`d Drive on a regular
basis such that it is free of construction debris and
tracking from construction traffic accessing the site.
6. It will be the responsibility of the developer/owner, to
provide the necessary testing, as applicable for the scope of
this project, for subgrade compaction, and other related
material tests for those improvements to be constructed within
public right-of-way.
(SEE ATTACHED MATERIAL SAMPLING & TESTING REQUIREMENTS)
7. Prior to any construction of the public improvements, the
necessary right-of-way construction permit(s) and respective
licensing will need to be submitted for processing by the
City.
I y u have any questions,
Sin erely,
~
Gre~dson, M.P.A.
City Engineer/Development
please contact me at 303-235-2868.
Review Engineer
cc: Bob Goebel, Public Works Director
Alan White, Planning & Development
Steve Nguyen, Traffic Engineer
Darin Morgan, Codes Administrator
John McGuire, City Surveyor
James Jacobsen, Eng. Tech II
Martin Orner, Planner
File (3)
Director
LOT5-44IND-2.LTR
2/99 CITY OF WHEAT RIDGE
MATERIALS SAMPLING AND TESTING REQUIREMENTS
FOR
CONSTRUCTION OF PUBLIC IMPROVEMENTS
DESCRIPTION
Materials sampling and testing for public improvements shall be performed by an independent
materials testing company at the expense of the developer, and/ar utility district. Unless
otherwise designated, all referenced specifications, standards or policies shall be the latest edition
as revised or updated by approved supplements published and issued prior to the date of the
building permit.
REQUIREMENTS
All materials sampling and testing shall be performed by certified, experienced and qualified
materials testing technicians who work under the supervision of a registered professional
engineer in the State of Colorado. All materials sampling and testing equipment shall be
serviceable and calibrated.
Soil classifications and moisture-density curves shall be provided to the Department of Public
Works inspectar prior to in-place density testing. Materials testing technicians shall fumish
copies of failed test results to the inspector promptly as the results become available. On a
weekly basis when testing is being performed, the developer shall fumish the inspector with
copies of all test results taken during the prior week and a cover letter, signed by the supervising
registered professional engineer, which summarizes the results and discusses any failed tests or
inconsistencies.
The City materials testing requirements aze provided in Table 720-1. All testing procedures,
point of verification and central lab requirements shall be as specified in the Frequency Guide
Schedule of the Colorado Department of Transportation Field Materials Manual. One test is
required for any fraction of the specified frequency. The reference to Section 203.07 in the table
is from the Colorado Department of Transportation Standazd Specifications for Road and Bridge
Construction.
Table 720-1
City of Wheat Ridge Materials Testing Requirements
Type of Test
Frequency
Remarks
Soil Survey (Classification),
1 per 1000 feet of roadway,
Surveys for roadway, sidewalk
AASATO M145
sidewalk or pipe trench
and trench may be combined
Moisture-Density Curve,
1 per on-site soil type
AASHTO method determined
AASHTO T99 or T180
1 per import material souree
by soil or materials type.
Embankment in-place density,
1 per 300 feet per lane per 8
Minimum density per soil
Colorado Procedures
inch loose lift
classification, Section 203.07
Roadway subgrade in-place
1 per 300 feet per lane
Minimum density per soil
density, Colorado Procedures
classification, Section 203.07
Sidewalk subgrade in-place
1 per 300 Feet of sidewalk
Minimum density per soil
density, Colorado Procedures
classification, Section 203.07
Pipe trench in-place density,
1 per 200 feet of trench per 2
Minimum density per soil
Colorado Procedures
foot vertical interval
classification, Section 203.07
Aggregate base course in-place
1 per 300 feet per lane
Minimum 95% of maximum
density, Colorado Procedufes
density, T180
Lime treated subgrade in-place
1 per 300 feet per lane
No less than 95% of std. dry
density, Colorado Procedures
density and opt. moisture, T99
Cement treated base in place
1 per 300 feet per lane
Density in accordance with
density, Colorado Procedures
contract documents, T134
Hot Bituminous Pavement
1 per each HBP grade and
Within specifications of
asphalt content and gradation
Marshall blow specified
approved mix design
Hot Bituminous Pavement in-
1 per 300 feet per lane per lift
92-96% of max. density except
place density, Colo. Procedures
Grade F to be 90-95%, T209
Concrete compressive shength
1 per 100 cubic yards
PCC pavement, structural
AASHTO Procedures
concrete, sidewalks and curbing
Concrete air content and slump
1 per 50 cubic yards
PCC pavement, structural
AASHTO Procedures
concrete, sidewalks and curbing