HomeMy WebLinkAboutLetter Acknowledging City standardsr
September 24, 2009
Erika Bridges, E.I.T.
Graduate Civil Engineer
City of College Station
1101 Texas Avenue South
College Station, TX 77842
RE: Creek Meadows — Section 2, Phase 3
Acknowledgement of City Standards
RME No. 260 -0430
Erika Bridges:
7607 Eastmark Drive, Ste. 250 -F <77840>
P.O. Box 9253, College Station, TX 77842
Off /Fax: (979) 764 -0704
email: civil @rmengineer.com
The purpose of this letter is to acknowledge that the construction plans for the public
infrastructure improvements, for the above referenced project, to the best of my knowledge, do
not deviate from the latest B /CS Design Guideline Manual. With the exception of the following
items:
❖ All segments of sanitary sewer line installed for this phase of construction, do not meet
the minimum flow velocity of 2.0 ft/s at peak flow conditions. The design of these lines
comply with minimum size, type and slope, however, the low number of dwelling units
discharging to these lines prevent peak flows from reaching a flow velocity of 2.0 ft/s;
• Some segments of the water lines installed for this phase of construction exceeds the
maximum bury depth of five (5) feet. This occurs only at utility crossings with grade
critical elements, where the water line cannot cross above the grade critical element and
still meet minimum bury depth of four (4) feet;
•S One segment of the proposed 8" water line, under Baker Meadow Loop, will only have
3.5' of cover. This was designed so that 12" clearance could be maintained with the 6"
sanitary sewer (pressure class pipe) and so that the sanitary sewer could be installed at the
minimum B /CS slope (0.80 %);
❖ Proposed storm sewer located in areas that will be subjected to vehicular loadings
(including fire truck loading) are designed with Reinforced Concrete Pipe (Class 4). This
design standard will withstand the stated loadings even when the cover over the pipe is
less than two -feet (2');
CD 1- 260 - 0430 -L03 Page 1 of 2
I also acknowledge, to the best of my knowledge that the details provided in the construction
plans are in accordance with the B /CS Standard Details.
Please do not hesitate to call if you have any questions.
Sincerely,
' /ooAo `o�� l j "
Rabon A. Metcalf, P.E. No. 88583
Texas Firm Registration No. F -4695
rabon @rmengineer.com
CD 1- 260 - 0430 -L03
88583
7607 Eastmark Drive, Ste. 250 -F <77840>
P.O. Box 9253, College Station, TX 77842
Off /Fax: (979) 764 -0704
email: civil@rmengineer.com
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