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Home My WebLink About00071199MISCELLANEOUS 1. See Note Sheet C3 2. See note Sheet C3 The Development Permit has been sent to Mr. Buckner for his signature and I told him to return it to you. At your earliest convenience please review this information and call with questions. Thanky.@ r �pr your help with this project. Hester, P.E. Revised Plans Graphic Xc: Charles Buckner Hester Engineering Company Civil Engineering Services 7607 Eastmark Drive, Suite 253 -B College Station TX 77840 979.693.1100 June 11, 2001 Bridgette George, Asst. Development Review Manager College Station Development Services Department 1101 Texas Avenue South College Station, TX 77842 Re: CD Exchange (SP) — Site Plan (01 -133) 1503 Earl Rudder Freeway College Station, Brazos County, Texas Dear Mrs. George, Below please find your review comments addressed: PLANNING 2 Pn� 1. See Sheet C 1 2. See Sheet C 1 3. No, Kerr Surveying Company 268.3195 has it and they are waiting for Mr. Springers signature. 4. See Sheet C 1 and the attached graphic. 5. See attached graphic. 6. See attached graphic. Mr. Buckner is discussing with Mr. Springer a joint use agreement. 7. See Sheet C3. 8. See Sheet C3. ENGINEERING _ 1. Carter's Grove Drainage Basin 6B does not require detention. 2. See Sheet C 1. 3. A separate plan provided by an irrigation contractor will provide this information. See note Sheet C3. 4. No work is planned in the TXDOT right -of -way. 5. See attached. ELECTRICAL 1. See note Sheet C2 2. See note Sheet C2 3. Load information will be provided by the Owner, Mr. Buckner 4. Items 4 -8, See Sheet C2 Hester Engineering Company Civil Engineering Services 7607 Eastmark Drive, Suite 253 -B College Station, TX 77840 Ph: 979.693.1100 Fx: 979.693.1075 Email: hec @gkg.net May 30, 2001 Ted May, P.E. City of College Station Development Services Department P.O. Box 9960 College Station, TX 77840 979.764.3570 Re: CD Exchange Drainage Report 1503 Earl Rudder Freeway College Station, Brazos County, Texas Drainage Report Dcar Ted, below find my Engineers Drainage Check list for this site: Lo cation i Primary drainage system identified Carter's Creek, Carter's Grove Tributary Surrounding developments shown See Key Map Local streets, drainage systems shown See Key Map Des cription ❑ Acreage of project 0.4735 Acres Land cover described Open, grass ❑ Primary /secondary systems within property shown See Sheet C1 ❑ General description Vacant CD Exchange — 1 503 Earl Rudder Freeway Drainage Report -- Page 1 of 4 Pages Drainage Basins ❑ References to FIRMS if applicable FIRM No. 142C ❑ Secondary system flow patterns and impact of development on existing system See Grading Plan, Sheet C2 ❑ Proposed pathways to Primary system shown or described See Key Map Design Criteria ❑ Any deviation from standards being requested? No C Discussion of site constraints and capacities (streets, existing structures, etc.) Runoff will discharge into an existing triple 8x4 concrete box culvert which is designed for ultimate flow. E; Discussion of any applicable previous drainage studies and how this plan will affect it When the adjacent Mobile Gasoline Station was constructed a triple 8x4 concrete box culvert was built which allowed the owners of the property to build on the entire tract of land. A report was prepared by Civil Design Services, Inc., Kenneth R, Rothe, P.E. 210.736.3188, titled " 1.546 ACRES NE CORNER OF HWY 6 (BYPASS) AND HYW 30 (HARVEY ROAD) K.D. TIMMONS PROPERTY COLLEGE STATION, TEXAS ", and a LOMA submitted to FEMA. Hydrologic Criteria Rainfall /runoff calculation method described and calculations provided Rational Method Q =CIA, QI00 =0.9x1 1.64x0.473= 4.96cfs Post Development Q100 =0.3xl 1.64x0.473 =1.65 cfs Pre Development Increase = 3.31 cfs Detention discharge / storage calculation method / calculations The box culvert was designed for ultimate development of this drainage basin and with the site on a Primary Channel (Carter's Creek, Carters Grove Trib.) no detention is required nor planned for this site. Storm recurrence intervals used The majority of the site will drain to a sump inlet that will discharge directly into the triple 8x4 concrete box culvert. The inlet is designed to accept Q100. ❑ DISCUSSIOn of other drainage facility design criteria used if not referenced in Standards NA Hydraulic Criteria i, Identify capacity of systems used CDS Report Section 8 Concrete Box Culvert Q100 =1022 cfs Ultimate ❑ Specify velocities at critical points in system NA Identify detention / retention outlet and routing No detention is planned for the site. ❑ Discussion of other drainage facility design criteria used not referenced in Standards NA ❑ DPDS Special Drainage Basin and Channel Reach Design Standards, page 10 & 11: CD Exchange — 1 503 Earl Rudder Freeway -- Drainage Report — Page 2 of 4 Pages • No mandatory detention for Carters Grove Basin Reference No. 6 • No mandatory Minimum Floor Elevation Drainage Facility Design ❑ Discuss drainage patterns / flows (pre vs. post) Rational Method Q =CIA, Q100= 0.9xI1.64x0.473= 4.96cfs Post Development Q100= 0.3x11.64x0.473 =1.65 cfs Pre Development Increase = 3.31 cfs Section 8 Q100 ultimate = 1022 cfs from the CDS report. ❑ Are they draining water onto another property owner? - if so, is it where the water flowed before? and is it not more than what flowed there before? and no faster than it flowed before? No, the runoff generated will flow through the driveways, into a sump inlet and discharge into the box culvert within the owners tract. ❑ Discuss erosion control measures employed During construction erosion control will be obtained using silt fencing and hay bales around the sump inlet and after construction solid sod will placed on the site. ❑ Discuss detention pond design (sideslope, low flow channels, outlet works, freeboard, emergency spillway) No detention is planned for this site. i ; Discuss maintenance access and responsibilities The drainage system installed by the owner will be maintained by the owner. Conclusions Veriti' compliance with DPDS (signed and sealed certification) 1 hereby certify that this report and accompanying drainage plan for the drainage design was prepared by me in accordance with the provisions of the Cities Drainage Policy and Design Standards for the owners thereof. I "xplain effectiveness of improvements with regard to controlling discharges of 5 - 100 year storm by a) Detaining No detention is planned. h) Accommodating runoff in existing / proposed easements or ROW discharging into primary system The runoff will discharge into an existing drainage easement / culvert which is a primary system. c) Combination of a K b NA Appendices ❑ References (all criteria and technical information used) A copy of the CDS report is available upon request, but must be returned. ❑ Hydrologic computations Land use assumptions for adjacent property This area is zoned commercial. Minor /major storm runoff at specific points The discharge for the site is designed for the Q100, as is the box culvert it will discharge into. CD Exchange -- 1 503 Earl Rudder Freeway — Drainage Report — Page 3 of 4 Pages ❑ Historic /fully developed runoff specific points NA ❑ Hydrographs at critical points NA ❑ Hydraulic computations ❑ Culvert capacities (headwater and tailwater assumptions) Tailwater from Carter's Creek was used for the concrete box culvert, CDS report. ❑ Storm sewer capacities HEC 2 was used by CDS to build a model of the drainage area and culvert size. ❑ Street capacities NA ❑ Storm inlet capacities (inlet control rating) Q100 was used to determine the design. Q= 3.OLy = 4.96efs /3x1.0 312 = 1.65 foot wide inlet will be required. DPDS, page 38, D. Inlet sizing. Open channel design HEC 2 was used by CDS to build a model of the drainage area and culvert size. Detention area / volume capacity / outlet capacity NA Attached Drawing Location map with drainage patterns See Site Plan, Sheet C1 l:loodplain map if any See Attachment, FEMA FIRM Map No. 142C Drainage plan with topo (existing and proposed with arrows if needed) See Drainage Plan, Sheet C2 Details ofoutlet structures See Drainage Plan, Sheet C2 If you hav any questions please contact me. OF TF,1y1 •NNMM�M�N�NNIHM�NN MICHAEL G. HESTER o- ,oA [1 CD Exchange — 1503 Earl Rudder Freeway — Drainage Report -- Page 4 of 4 Pages CITY OF COLLEGE STATION DEVELOPMENT SERVICES 1101 Texas Avenue South, PO Box 9960 College Station, Texas 77842 Phone (979) 764 -3570 / Fax (979) 764 -3496 MEMORANDUM June 19, 2001 TO: Charles Buckner, Via fax 936- 582 -1486 FROM: Bridgette George, Asst. Development Review Manager SUBJECT: C D EXCHANGE (SP) - SITE PLAN Staff reviewed the above - mentioned site plan as requested. The following page is a list of staff review comments detailing items that need to be addressed. The next submittal will be the third and final review by staff for this round of reviews. If all items have not been addressed on the next submittal, another $100 processing fee will need to be submitted for the subsequent set of three (3) reviews. Please address the comments and submit the following information for further staff review and approval of the site plan: Six (6) sets of construction documents with the revised site and landscaping plans attached; Two (2) copies of the revised site plan; and One (1) copy of the landscape plan. If there are comments that you are not addressing with the revised site plan, please attach a letter explaining the details. If you have any questions or need additional information, please call me at 764 -3570. Attachments: Staff review comments cc: Michael G. Hester, Via fax 693 -1075 Case file #1 -- 500133 Staff Review Comments Page 1 of 3 Transmit Log Record BitWare Client Page 1 Status Log Date Time To Company Application OK 600 6/19/01 14:09:38 Charles Buckner Microsoft Word - PZ04988.DOC OK 601 6/19/01 14:09:54 Michael McClure McClure Engineering, Microsoft Word - PZ04988.DOC Transmit Log Record Status Log Date BitWare Client Time To Company Application Page 1 OK 583 6/8/01 9:14:52 Charles Buckner Microsoft Word - PZ04938.DOC OK 584.3 6/8/01 9:37:44 Michael G. Hester Hester Engineering Microsoft Word - PZ04938.DOC CITY OF COLLEGE STATION DEVELOPMENT SERVICES 1101 Texas Avenue South, PO Box 9960 College Station, Texas 77842 Phone (979) 764 -3570 / Fax (979) 764 -3496 MEMORANDUM TO: Charles Buckner, Via fax 936 -582 -1486 FROM: Bridgette George, Asst. Development Review Manager SUBJECT: C D EXCHANGE (SP) - SITE PLAN Staff reviewed the above - mentioned site plan as requested. The following page is a list of staff review comments detailing items that need to be addressed. Please address the comments and submit the following information for further staff review: Two (2) revised site and landscaping plans. If there are comments that you are not addressing with the revised site plan, please attach a letter explaining the details. If you have any questions or need additional information, please call me at 764 -3570. Attachments: Staff review comments cc: Michael G. Hester, Via fax 693 -1075 Case file #01 -33 Staff Review Comments Page 1 of 3 J:\PZTEXT\PZ04938.DOC