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Staff Comments""'llll"'"illlll""""'""'""'-.~~~~~~~~CrTYOF C OrLEGE STATIONI -~~_._..., ................................ ..... Home o/Texas A&M University• = ' . MEMORANDUM DATE: August 19,2014 TO: Tyler Lewis; via: tyler.lewis@kimley-horn.com FROM: Danielle Singh, Transportation Engineer SUBJECT: THE BARRACKS DETENTION FACILITY MODIFICATIONS (DP) ENGINEERING COMMENTS NO. 1 1. Drainage area 01 is not shown on the proposed condition drainage map. 2. The outfall labels on the drainage maps do not match some of the labels in the report. 3. Some of the impervious cover percentages look low. Please check the single family and the townhome areas. Please use how the existing phases have developed to calculate the impervious cover, as this development utilizes significant more impervious cover than typical residential. 4. Basin A2 are decreases in Table 2, though the actual area remains the same. 5. Please include detention pond construction plans with this report. The report cannot be fully reviewed without the detention pond design which may result in additional comments. Remove the note on page 10 referencing changes to be required with the construction plans, as the plans need to be provided with this report. 6. Section 3.4, referenced on page 10, was not included with this submittal. 7. Page 11 refers to the grading and construction plans for the proposed facilities from Appendix D which were not included in the submittal. 8. Please check the units on Table 5. 9. The drainage report will need to be sealed . Reviewed by: Danielle Singh Date: August 19, 2014 PC: Heath Phill ips Investments, LLC; via: heath superiorstructures@yahoo.com P&DS Project No. 14-00900185 Pla11ni11g & Development Services . P.O. BOX 9960 • 11 OJ TEXAS AVENUE · COLLEGE STATJON ·TEXAS • 77842 TEL. 979.764.3570 •FAX. 979.764.3496 cs b<.gov I devservi ces MEMORANDUM DATE: September 30, 2014 TO: Tyler Lewis ; via : tyler.lewis@kimley-horn.com FROM: Danielle Singh, Transportation Engineer SUBJECT: THE BARRACKS DETENTION FACILITY MODIFICATIONS (DP) ENGINEERING COMMENTS NO. 2 1. We have received the updated preliminary plan since your original submittal. P13 does not include 5 acres of open space, this is mostly designated for multi-family. P14 is also unlikely to be developed with 5 acres of open space. P6 includes commercial to be developed with the Barracks though this is shown as open space. 2. On the proposed condition drainage area map, the Watershed Information table was not updated with the changes to this report. 3. The City will not maintain the storm sewer pipes between Pond 1 and Pond 2 except within the ROW of General Parkway. Please show an additional junction box on the northeast side of General Parkway. 4. It appears that the weir for Pond 1 will not properly drain, with higher elevations immediately downstream of the weir. How do you propose to address this situation? 5. Are the tables provided produced by SWMM? If not, please provide SWMM output for reference. 6. In Appendix D, Downstream 100 Year Hydraulic Conditions, please explain why the flow is decreasing as it moves downstream. For instance, at station 7431 the flow is less than half of the flow leaving the site which is immediately upstream. Construction Plan Comments: 7. Please label rip rap downstream of Pond 4. 8. Where is the emergency spillway for Pond 2? 9. On Sheet 8, Pond 3 discharge is listed as 3325.43 cfs. Please revise. Reviewed by: Danielle Singh Date: 9/29/2014 PC: Heath Phillips Investments, LLC; via: heath superiorstructures@yahoo.com P&DS Project No. 14-00900185 Planning & Development Services P.O. BOX 'J960 • 1101 TEXAS AVENUE ·COLLEGE 5T\TION ·TEXAS • 77842 TEL 979.764.3570 ·FAX. 979.764.3496 cstx.gov/devservices