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HomeMy WebLinkAbout40 Development Permit 484 Napa Auto PartsF / L f : fl) /WA ~u ~ i 4~ MUNICIPAL DEVELOPMENT GROUP 203 Holleman Drive East • Co llege Station , Texas 77840 • 409-693-5359 •FAX: 409-693-4243 •EMAIL: MDGcs@ao l.com E ngin eerin g, Surveying, Planning and Environm ental Consultants August 12, 1997 Kent Laza, City Engineer City of College Station P .O . Box 9960 College Station, TX 77842 Kent : After conferring with the City of College Station Fire Department Officials , we can agree to a change of location of the fire hydrant scheduled to serve the new NAP A Auto Parts Store currently under construction . This change will result in a considerable savings of line cost and pavement replacement. As built plans will be provided to the City upon completion of the project. North Bardell, P .E . C.E .O . NB/kw 000004-c.14-24(2852) ~ ?1ec r/~N r 1s Th Re c._ocA'le°D w 1-rf/1Af 71-1€ €KISftNG UT1Lt7Y €ASi::r>te-.lT A""h '1ACEN.I li2r 7D -nlE ACc..ESS. C7\S€me.NT. MUNICIPAL DEVELOPMENT GROUP 203 Holleman Drive East• College Station, Texas 77840 • 409-693-5359 •FAX: 409-693 -4243 • EMAIL: MDGcs@aol.com Engineering, Surveying, Planning and Environmental Consultants August 13, 1997 Steve Homeyer City of College Station P.O . Box 9960 College Station, TX 77842-9960 Re: NAP A Auto Parts Store, MDG File/Project No. 000004-2852 Steve: We have reviewed the proposed alternate curb detail enclosed with this letter as "Exhibit A". This detail is acceptable and we have approved it for use as an alternate at the owners discretion . If you have questions or comments, please feel free to call me or Greg Taggart . North Bardell, P .E. C.E .O . NB/kw 000004-c .17-24(2852) t Top of pavement 3" Rad . \ Slope per drainage plan ~ ~Rebar Pavement reinforcement Side View Top of curb t APPROVED FOR CONSTRUCTION AUG 1 8 199 . Continuous curbing poured on top of pa mg COLLEGE STATION ENGINEERING Lj 12" Revised Curb Detail for the NAPA Auto Parts Store Not to scale DEVELOPMENT PERMIT PERMIT NO. 484-A NAPA AUTO PARTS FOR AREAS OUTSIDE THE SPECIAL FLOOD HAZARD AREA RE : CHAPTER 13 OF THE COLLEGE STATION CITY CODE SITE LEGAL DESCRIPTION: Lot 2R, Southwood Valley 19 OWNER: J. B . Goolsby 737 So . Rosemary Bryan, Texas 77802 409-846-4103 DRAINAGE BASIN: Bee Creek Tributary "A", Segment II TYPE OF DEVELOPMENT: SITE ADDRESS: Not Addressed This permit is valid for complete site development as shown on the approved plans. This permit does not cover the construction of the water line and fire hydrant. The plan and profile sheet must be submitted and approved prior to installation. The Contractor shall take all necessary precautions to prevent silt and debris from leaving the immediate construction site in accordance with the approved erosion control plan as well as the City of College Station Drainage Policy and Design Criteria. The Owner and/or Contractor shall assure that all disturbed areas are sodden and establishment of vegetation occurs prior to removal of any silt fencing or hay bales used for temporary erosion control. The Owner and/or Contractor shall also insure that any disturbed vegetation be returned to its original condition, placement and state . The Owner and/or Contractor shall be responsible for any damage to adjacent properties, city streets or infrastructure due to heavy machinery and/or equipment as well as erosion, siltation or sedimentation resulting from the permitted work. Any trees required to be protected by ordinance or as part of the landscape plan must be completely fenced before any operations of this permit can begin. In accordance with Chapter 13 of the Code of Ordinances of the City of College Station, measures shall be taken to insure that debris from construction, erosion, and sedimentation shall not be deposited in city streets, or existing drainage facilities . I hereby grant this permit for development of an area outside the special flood hazard area. All development shall be in accordance with the plans and specifications submitted to and approved by the City Engineer in the development permit application for the above named project an all of the codes and ordinances o e City o College Station that apply. Date Date Contractor Date DEVELOPMENT PERMIT PERMIT NO. 484 NAPA AUTO PARTS FOR AREAS OUTSIDE THE SPECIAL FLOOD HAZARD AREA RE: CHAPTER 13 OF THE COLLEGE STATION CITY CODE SITE LEGAL DESCRIPTION: Lot 2R, Southwood Valley 19 OWNER: J. B . Goolsby 737 So . Rosemary Bryan, Texas 77802 409-846-4103 DRAINAGE BASIN: Bee Creek Tributary "A", Segment II TYPE OF DEVELOPMENT: This permit is valid for site clearing and grading only. SITE ADDRESS: Not Addressed The Contractor shall take all necessary precautions to prevent silt and debris from leaving the immediate construction site in accordance with the approved erosion control plan as well as the City of College Station Drainage Policy and Design Criteria. The Owner and/or Contractor shall assure that all disturbed areas are sodden and establishment of vegetation occurs prior to removal of any silt fencing or hay bales used for temporary erosion control. The Owner and/or Contractor shall also insure that any disturbed vegetation be returned to its original condition, placement and state. The Owner and/or Contractor shall be responsible for any damage to adjacent properties, city streets or infrastructure due to heavy machinery and/or equipment as well as erosion, siltation or sedimentation resulting from the permitted work. Any trees required to be protected by ordinance or as part of the landscape plan must be completely fenced before any operations of this permit can begin. In accordance with Chapter 13 of the Code of Ordinances of the City of College Station, measures shall be taken to insure that debris from construction, erosion, and sedimentation shall not be deposited in city streets, or existing drainage facilities . I hereby grant this permit for development of an area outside the special flood hazard area. All development shall be in accordance with the plans and specifications submitted to and approved by the City Engjneer in development permit application for the above named project and all of the codes and · s of th ity of College Station that apply. 7--2'5-97 Date Date Contractor Date DEVELOPMENT PERMIT PERMIT NO. 484 NAPA AUTO PARTS FOR AREAS OUTSIDE THE SPECIAL FLOOD HAZARD AREA RE: CHAPTER 13 OF THE COLLEGE STATION CITY CODE SITE LEGAL DESCRIPTION: 0 .784 acre tract out of Southwood Valley 19, Lot 2R OWNER: J. B. Goolsby 737 So . Rosemary Bryan, Texas 77802 409-846-4103 DRAINAGE BASIN: Bee Creek Tributary "A", Segment II TYPE OF DEVELOPMENT: This permit is valid for site clearing and grubbing only. SITE ADDRESS: Not Addressed The Contractor shall take all necessary precautions to prevent silt and debris from leaving the immediate construction site in accordance with the approved erosion control plan as well as the City of College Station Drainage Policy and Design Criteria. The Owner and/or Contractor shall assure that all disturbed areas are sodden and establishment of vegetation occurs prior to removal of any silt fencing or hay bales used for temporary erosion control. The Owner and/or Contractor shall also insure that any disturbed vegetation be returned to its original condition, placement and state. The Owner and/or Contractor shall be responsible for any damage to adjacent properties, city streets or infrastructure due to heavy machinery and/or equipment as well as erosion, siltation or sedimentation resulting from the permitted work. Any trees required to be protected by ordinance or as part of the landscape plan must be completely fenced before any operations of this permit can begin. In accordance with Chapter 13 of the Code of Ordinances of the City of College Station, measures shall be taken to insure that debris from construction, erosion, and sedimentation shall not be deposited in city streets, or existing drainage facilities . I hereby grant this permit for development of an area outside the special flood hazard area. All development shall be in accordance with the plans and specifications submitted to and approved by the City Engineer in the development permit application for the above named project and all of the codes and onlinan~tation that apply . ~~~ strator epres uve Date ~~~~Dk-: Date Contractor Date r ACCOUNT NO . _________________ _ 399108 CITY OF COLLEGE STATION $ DO . rn ---~---~=----\ __ . 19 q] R Figure XII Development Permit City of College Station, Texas Site Owner: t . /3, Goo/ 5 b / Address : 7 37 ~. ~r'YJi?4. r1 Bri.ya Y1 Telephone: fl1-6 -± (CJ 3 Architect/ Address: 203 E. I.fol } em-ti1 (:Jr, C . 5 Engineer: /\foR.r/-1 8 . BBRIJEf;,L;Jffz, Telephone No : f,'13 , s:? 55' Contractor: J /3. G'oo / 5 h y Address : Wt> k No. Telephone No : 6 9/J-2-c;? 4-3 Date Application Filed : ~ 2. ;/'I f l Approved: __________ _ Application is hereby made for the following development specific waterway alterations : Application Fee Signed Certifications Drainage and erosion control plan, with supporting Drainage Report two (2) copies each . Site and Constru tion Plans, with supporting D1 ainage Report two (2) copies each . Other: c · e . Y'vt' t:t .f.o /1 ACKNOWLEDGMENTS : I , No/Z.'nt !5. B1f<))J:.tl J~esign engineer/.ewfl:ef, hereby acknowledge or affirm that : The information and conclusions contained in the above plans and supporting documents comply with the current requirements of the City of College Station, Texas City Code, Chapter 13 and its associated Drainage Policy and Design Standards. As a condition of approval of this permit application, I agree to construct the improvements proposed in this application according to these documents and the requirements of Chapter 13 of M&titr;;~ Prop@rt'' Ovm@r(s) ' Figure XII Continued CERTIFICATIONS : (for proposed alterations within designated flood hazard areas .) A. I, tJ' <!Jrl/}= 8) Bad.~l/ J;ertify that any nonresidential structure on or proposed to be on this site as part of this application is designated to prevent damage to the structure or its contents as a result of flooding from the 100 year storm. M f3 . -f14tf f G.J1 0 1r11 Engineer IYate B. I, }./opp+ 8, fJa.r)e)f Jt, , certify that the finished floor elevation of the lowest floor, including any basement, of any residential structure, proposed as part of this application is at or above the base flood elevation established in the latest Federal Insurance Administration Flood Hazard Study and maps, as amended . ~B l ~~ Engineer C. I, certify that the alterations or development covered by this permit shall not diminish the flood-carrying capacity of the waterway adjoining or crossing this permitted site and that such alterations or development are consistent with requirements of the City of College Station City Code, Chapter 13 concerning encroachments of flood ways and of floodway fringes . Engineer Date I, do certify that the proposed alterations do not raise the level of the 100 year flood above elevation established in the latest Federal Insurance Administration Flood Hazard Study. Engineer Date Conditions or comments as part of approval : ~~~~~~~~~~~~~~~~~~~ In accordance with Chapter 13 of the Code of Ordinances of the City of College Station, measures shall be taken to insure that debris from construction, erosion, and sedimentation shall not be deposited in city streets, or existing drainage facilities. I hereby grant this permit for development. All development shall be in accordance with the plans and specifications submitted to and approved by the City Engineer for the above named project. All of the applicable codes and ordinances of the City of College Station shall apply . 0000 04 -e 02-2 0(28 52) DRAINAGE COMPUTATIONS FOR NAP A AUTO PARTS STORE C OLLEGE STATIO N , B RAZO S COUNTY, TEXAS JUNE, 199 7 /, SUMMARY This report outlines the drainage plan for the NAPA Auto Parts facility. The subject property site is situated on the south access road of FM 2818 between the United States Post Office building site and the Leon Sevcik Texaco Service Center. The development is established within Phase I , consisting of a 0. 784 acre tract out of Southwood Valley 19 , Lot 2R which will carry an address of 1520 FM 2818 . This tract will have traffic access off an existing 30' access easement on its east property line. The site is currently undeveloped and vacant with the exception of native grasses and weeds . The natural drainage of most of the site slopes to the southeast onto adjoining land owned by the developer of this Phase I. Proposed runoff patterns will be altered to redirect approximately 56 % of the developed area northwest to the FM 2818 right-of-way. The remainder (44%) of the area will be left draining to the southeast. The post-development runoff which is directed to the sheet flowage southeasterly has been calculated to closely approximate the pre-development runoff from the entire tract , thus requiring no detention. The post-development runoff which is redirected to FM 2818 right-of-way will be handled by the existing drainage structures of the TexDOT. The flows run from the drainage ditch through a 24" pipe to another ditch , a box culvert under Texas Avenue and thence to Bee Creek. As we demonstrate, the additional post development 3 .26 cfs contributed to the system is trivial and will have no measurable effect. The drainage model is presented in three basic parts : the project site as a whole , the project site draining southeast, and the project area draining northwest. 'Relevant calculations are provided in the appropriate section of this report according to the scenario modeled . An additional section is also included to verify the capacity and capability of the TexDOT structures affected. SECTION 1 PROJECT SITE CALCULATIONS The fust section covers drainage information relating to the site as a whole and establishes the peak runoff in pre-development condition and demonstrates that the post-development runoff conditions to the southeast do not exceed the pre-development runoff conditions from the entire tract , thus indicating no requirement, for detention and no change in runoff discharge methods (sheet flow). This is accomplished by regrading the site and directing drainage flows from the front of the site to the FM 2818 right-of-way. SECTION2 This section treats the premise above with the necessary calculations. In as much as no detention is being provided no routing diagrams are included. 0000 04 -e.02 -20(28 52) SECTION 3 This section treats the premise above and demonstrates by calculation the results on runoff created by the proposed development pattern to the northwest. TexDOT right away will be examined to verify that the small additional runoff created by this development can be adequately handled by the existing drainage structures. CALCULATIONS: These calculations are summarized according to the following methodology . Based on the use of the Rational Method (Q=CIA) where 11 Q 11 is the runoff, 11 C 11 is the coefficient (assumed to be .40 in pre-development condition), 'I 11 is the storm intensity in inches/hour for each selected frequency and 11 A 11 is the drainage area in acres . We will assume a ten minute time of concentration and a post-development 11 C 11 of 0.86 to develop the post-development discharge 11 Qpost 11 • Tabulations of the pre-development and the post-development hydrographs are provided. The hydrographs are triangular in shape and are based on the standard SCS unit hydrograph with time to peak set to equal the time of concentration and the total base time set 3 .00 times the time of concentration. (Please note that a 30 minute storm event duration was utilized exclusively throughout this report due to the nature and the relative size of the project). Comparison of the pre-development discharge rates are included. By regrading the site the post-development 11 Q 11 's on approximately 44% of the site draining to the southeast are approximately equal to the pre- development 11 Q 11 's of the entire site originally draining in that direction. SECTION2 This portion of the tract now sheet drains to the south eventually reaching a culvert under Longmire Street thence to the creek system. The proposed project does not change this pattern or the amounts of runoff contributed in the pre-development condition. Pre-development Peak Storm Water Discharge Rates to the South Use 10 minute concentration and 0.784 acres. III": Peak 11 Q": 000004-e .02 -20(2852) 2 year= 6 .33 in/hr 5 year= 7.69 11 10 year= 8.63 11 2 year= 1.985 5 year= 2.41 10 year= 2.7064 25 year= 9.86 in/hr 50 year= 11.15 11 100 year= 11.64 11 25 year= 3 .092 50 year= 3.497 100 year = 3.6503 If we reverse our calculation methodology and use the Qpre as Qpost and 0.86 as a constant C factor and the given intensities , we will get the area allowable to drain to the southeast. A =Qpost/CI Area: SECTION 3 2 year = 0.3647 acres 5 year = 0.3647 11 10 year = 0.3647 11 25 year = 0.3647 acres 50 year= 0 .3647 11 100 year= 0 .3647 11 The front of the 0 .784 acre tract will create the following pre-development and post-development llQll's Q=CIA Qpre: C=0.40 , I varies , A=O Qpost: 2 year = 0 5 year= 0 10 year = 0 C=0.86 , I varies , A=0.4390 2 year= 2.39 cfs 5 year= 2 .96 11 10 y ear = 3.26 11 25 year = 0 50 year= 0 100 year= 0 25 year= 3.72 cfs 50 year= 4.21 11 100 year= 4.39 11 The building proposed on this site has a gross roof area of 6300 square feet or 0 .1446 acres and the drainage from the roof will be directed to the northwest by gutters , roof drains , downspouts and surface grading and is included in the calculations above. The grading plan attached to this report will indicate the approximately 15 ,000 square feet of Lot 2R to be drained to the southeast and also the area to be drained into the FM 2818 right-of-way . And also the area to be drained in to the 2818 R.O .W . Currently the access road of FM 2818 has a curb and gutter only on the private property side of the roadway and the pavement cross drains to a ditch section between the access road and the northeast bound main lanes which transports the runoff to a 24 inch receiving culvert. the receiving culvert has a calculated capacity of 21 c.f.s. The runoff from the front portion of Lot 2R will sheet drain across the existing curb and onto the access road pavement contributing 3 .26 c.f.s. to this culvert location at a ten y ear frequency . 000004 -e .02-2 0(2852) The topography indicated a total drainage area into this pipe of 4.12 acres with a calculated runoff for a ten year frequency of 17.40 c.f.s. using a ten minute time of concentration. Grass Area= 2.92 Acres: use a C of 0.30 Paved Area= 1.20 Acres: use a C of 0.95 110 = 8 .63 Qpre = .30 X 2 .95 X 8.63 = 7.56 Qore = .95 X 1.20 X 8.63 = 9.84 17.40 000004-e .02-20(2852)