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Home My WebLink About09-00100066- 00076436CASTLE ROCK — PHASE 4 RESPONSE TO ENGINEERING COMMENTS NO. 1 1. Please show and label all proposed easements. Easements are shown and labeled on Sheet 1. 2. It appears that the Zone AE floodplain area may extend further west based on the current FEMA map and contours. Please verify. The floodp/ain area has been adjusted using the BFE and the existing topography from survey data. 3. Sh.1 — Please provide silt fencing along the rears of the lots along the eastern side of the property. Silt fencing has been added. 4. Sh.1 — Provide inlet protection for Inlet #1. Inlet protection has been added. 5. Sh.2— Note #2 should reference details ST1 -00, ST2 -01, and ST3 -00. Note #2 has been revised to reference the details. 6. Sh.2 —Note #3 should reference detail SW1 -02 for the sidewalk and SW3 -00 for the ramp. Note #3 has been revised to reference the details. 7. Sh.2 — Note #4 should reference detail ST4 -04. Note #4 has been revised to reference the detail. 8. Sh.2 — Please label the curb return radii. The curb return radii have been labeled. 9. Sh.3/4/5 — Please revise Note #2 to specify ASTM C -76. The notes on these Sheets have been revised to specify ASTM C -76. 10. Sh.5 — Please note the pipes which need to be plugged for future use and how they should be plugged. Notes have been added to the profile to show how the pipes are to be plugged. 11. Sh.6 /Drainage Report — How is the 100 -yr flow being conveyed to the tributary of Spring Creek? Per Section VI.A.2.b. of the Stormwater Design Guidelines, the 100 -yr flow shall be "discharged into a drainage easement or drainage ROW that is part of the designated Conveyance Pathway system, or directly into a main channel of the primary drainage system." The 100 -year runoff is contained with the proposed storm sewer pipes and they discharge into an existing ditch which is part of a tributary to Spring Creek. These pipes will be extended with the construction of Phase 6 and will discharge into a drainage easement which will be conveyed by the Phase 6 Final Plat. 12. Sh.7 — Please verify that all parts of the structure on Block 2, Lot 43 will be within 500 -ft of the fire hydrant. The fire hydrant has been moved to ensure the 500' requirement is met. The revised location is shown on Sheet 7. 13. Sh.7 — Please label separation distance between pipes. The separation distances have been labeled. 14. Sh.7 — The waterline is exceeding the maximum bury depth of 5 -ft in some areas. Please revise. The waterline bury depth needs to be slightly greater than 5' to go under the storm sewer pipe. This is noted on the revised Letter of Acknowledgment. 15. Sh.8 — Sanitary service flowlines may have a maximum 3.5 -ft bury depth at the ROW or edge of easement. Please verify that this is not being exceeded. The depths have been checked and revised as necessary to not exceed 3.5'. 16. Sh.8 — Label the 21 -in flowline at existing Sta. 1 +13.67 manhole. The flowline is labeled. 17. Sh.8 — Please label vertical separation distances between pipes. Vertical separation distances are labeled. 18. Sh.8 — Please match soffits of drop pipe and largest pipe in manhole. Elevations revised to match soffits. 19. Sh.8 — Please specify that all drop connections will be inside the manhole. A note was added to specify this requirement. 20. Sh.8 — Horizontal separation distance? N/A 21. Sh.8 — TCEQ separation distance? N/A 22. Sh.8 — All sewer main and service connections within the ROW must ASTM3034, SDR26 with gaskets. Please revise Notes #6 & #7. Notes revised as requested. 23. Drainage Report — App.D, P.24 should specify 0.012 as the roughness coefficient for HDPE. A revised Page 24 is attached with this revision. 24. Drainage Report — In App.C, please verify that the 100 -yr storm is being contained within the right -of -way. A revised Appendix C is attached with the elevation of the 100 yr storm shown and the freeboard available for the 100 year storm. 25. Drainage Report — Please provide the velocity of water within the street in App. C and verify that it does not exceed the maximum 10 fps. The design velocity has been added to the Appendix C table and shows the velocity does not exceed 10 fps. Please note, the alignment data has been added to the plan and profile sheets for the contractors use. Also, some of the size of the waterline services were mis- labeled and have been revised. Hanle Engineering Company P.O. Box 11587 College Station, Texas 77842 979.693.7191 officelfax 979.436.1559 mobile December 1, 2009 Enka Bridges, EIT Graduate Civil Engineer Department of Public Works 1101 Texas Avenue College Station, TX 77840 Re: Castle Rock Phase 4 — Construction Drawings Dear Ms. Bridges; Attached are 1 copy of the revised construction drawings, my response to the staff comments, 2 copies of revised drainage report Page 24 and Appendix C, a revised Letter of Acknowledgement and a revised Engineer's Estimate of the construction cost for the above referenced project. Please let me know if you want me to have the revised drainage report pages inserted into your copies of the drainage report. If you have any questions, please do not hesitate to call. Very truly yours, Harle Engineering Company Joe ScOultz, P.E. Civil Engineer HARLE ENGINEERING COMPANY 3002 Texas Avenue South College Station, Texas 77845 Voice /Fax 979.693.7191 December 1, 2009 Alan Gibbs, P.E. City Engineer Development Services City of College Station College Station, Texas RE: Letter Acknowledging City Standards — Castle Rock Subdivision Phase 4 Dear Mr. Gibbs: The purpose of this letter is to acknowledge that the construction plans for the water, sanitary sewer, streets and drainage for the above - referenced project, to the best of my knowledge, do not deviate from the B /CS Design Guideline Manual except that Waterline W4 -2, shown on Sheet 7, has a bury depth slightly greater than 5' in order for the waterline to go under the storm sewer line. No other alternate design or construction methodology was used. I also acknowledge that, to the best of my knowledge, the details provided in the construction plans are in accordance with the B /CS Standard Details. Sincerely, k oseph P. ' Schultz, P.E. Civil Engineer S Harle Engineering Company P.O. Box 11557 College Station, Texas 77842 979.693.7191 oificelfax 979.436.1559 mobile December 11, 2009 Erika Bridges, EIT Graduate Civil Engineer Department of Public Works 1101 Texas Avenue College Station, TX 77840 Re: Castle Rock Phase 4— Construction Drawings Dear Ms. Bridges: Attached are 7 copies of the revised construction drawings and my response to your comments. If you have any questions, please do not hesitate to call. Very truly yours, Harle Engineering Company ME � fAi �. 7 ''lU Z' ngineer ( �At m� �r CASTLE ROCK — PHASE 4 RESPONSE TO ENGINEERING COMMENTS NO. 2 8. Sh.2 — Please label the curb return radii. The curb return radii have been labeled at Castle Rock Parkway and Rocky Vista. 11. Sh.6 /Drainage Report — How is the 100 -yr flow being conveyed to the tributary of Spring Creek? Per Section VI.A.2.b. of the Stormwater Design Guidelines, the 100 -yr flow shall be "discharged into a drainage easement or drainage ROW that is part of the designated Conveyance Pathway system, or directly into a main channel of the primary drainage system." The 100 -year runoff is contained with the proposed storm sewer pipes and they discharge into an existing ditch which is part of a tributary to Spring Creek. These pipes will be extended with the construction of Phase 6 and will discharge into a drainage easement which will be conveyed by the Phase 6 Final Plat. The pipes shown on the Phase 4 plans are proposed to be constructed with Phase 4. When Phase 6 is constructed Pipes 406 and 412 will connect to inlets and additional pipes constructed to extend the storm sewer system. The storm water runoff from a small portion of drainage areas 411A and 414A runs off the end of the pavement for Rocky Vista Drive. The amount of flow is minimal and will spread out quickly and become sheet flow until it reaches an existing drainageway. Rock riprap has been added at the end of the street to dissipate the energy in the runoff coming off the street gutter. This additional rock riprap is shown on Sheets 1, 2 and 6. I have also included a revised Sheet 13 of 16 where I have addressed this flow. 16. Sh.8 — Label the 21 -in flowline at existing Sta.1 +13.67 manhole. The flowline label has been revised to elevation 265.0. 18. Sh.8 — Please match soffits of drop pipe and largest pipe in manhole. The profile has been revised to match the soffits on Sheet 8. Additional items: 1. The streetlight locations are shown on Sheet 2. 2. The end of road street sign detail has been added to Sheet 2.