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TEXAS FIRM REGISTRATION NUMBERS
ENGINEERING F-2214&SURVEYING 100410
SAN ANTONIO / LAREDO
BRYAN / COLLEGE STATION
Wastewater Design Report
Addendum 1
for
University Town Center, Phase 2 & 3
March 24, 2015
Background
The original Wastewater Design Report for University Town Center, Phase 2& 3 was prepared in May,
2005 in conjunction with that development. That report described and analyzed two sewer Service Areas
(East and West)that served the various buildings in the proposed development along with existing
structures in the vicinity. Page 9 of that report shows a breakdown of anticipated flows from the facilities
in each Service Area and the capacity of the sewer line serving each. Those flows are shown below.
East Service Area
Avg Daily Flow(gpm) 1 Peak Hourly (gph) Line Capacity (gph)
Existing Facilities 1 61.61 ` 14,786.4 — —
.........
Building 2 10.64 152.4
Building8................_............_ 16.26 ..............3,903.0........ �.... —
Building 9 13.31 3,195.0
TOTAL 91.82 22,036.8 54,000.0
West Service Area
Avg Daily Flow(gpm) ? Peak Hourly (gph) Line Capacity (gph)
Existing Facilities 29.25 17,020.8
Building 3......_.._.._....................---.._-.. 0.77 185.0 —.
Building4......................................_' 3.78 908.3 .._....
Building 5 1.03 247.5
Building 6 ...................................._....0.61 146.2
Building 7 0.61 146.2
TOTAL 36.05 8,654.2 28,200.0 *
*Flow capacity was computed for the last segment of line adjacent to University Drive that existed at the
time, which was clay tile at a 0.75%slope. It has since been replaced with a PVC pipe @ 0.75%slope.
In April 2, 2007, a Sanitary Sewer Design Memo was submitted to analyze the ability of the West Service
Area to serve the Marriot Residence Inn being anticipated at that time. This building added 13,200 gph to
the peak flow in West Service Area, increasing the Total Flow through the line to 21,854 gph which was
well below the capacity of the 8' line serving that area.
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Proposed Development
The current development of Phase 3 has necessitated sewer flows from what was then Building 8 (now
referred to a Buildings B &F on the current plans)be redirected to the West Service Area. The anticipated
use of the floor space inside these two buildings is unknown at this time. However,using the same
flowrate assumptions as in the May 2005 Report and the April 2007 memo,the new flowrate into the sewer
line serving the West Service Area is as follows:
Revised West Service Area
Avg Daily Flow...($pm)...........!....................Peak Hourly (gph)............. ......Line Capacity (gph)..........
Existing Facilities 29.25 7,020.8
Building 3........... �_..__.... 0.77 185.0
Building4..............._.. a 3.78_ f 908.3
Building 5........................— ..__..__..-_...._.._...._._. 1.03247.5
Building6 0.61 ............................ - 146.2..____........_.....__ — — .... — .._..— ........_._.__......
.... . ......... -....__.. _.._......................................__, ...._...... — —
...............
Building 7 0.61 146.2
Marriot Residence Inn na 13,200.0
Building 8 16.26 3,903.0
TOTAL na 25,757.0 28,200
Conclusion
From the table above, we conclude that the 8" sewer line serving the West Service Area can provide
adequate sewer service to Buildings B &F as is being proposed with the Phase 3 development.
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