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HomeMy WebLinkAboutMiscellaneous (2)i 1 - _ ~. Sam' S ,, Drava e Comments regarding: Impact Stud g eliminar lat shows the 100 year floodplain as The pr y p determ-fined b FEMA, The 104 year elevation as determined by y FEMA is 256. A portion of the tract shown on t:he reliminary plat has elevations as low as 256. However,°t:he p + - 3 0 0 feet from the s it:e . 100 year floodplain is shown This discrepency should be addressed. e a licant stated a desire for no detention due to Th pp ill proximity of tract to Carter's Creek. The requirement w be waived if applicant shows; 1 the maximum release from site and entering } , Carter's Creek occurs prior to the peak In Garter s Creek ehydrographs} and, 1 [ ° 2) the capacity of the culvert under SH 60 is adequate to handle increase in flow and, 1 3 for the channel that runs through the residential } ° ° ° section south of SH 30, there is no increase in Veloct or elevation fore each of the design storms, or Y that the channel is designed to handle. the increase. i u h the runoff w-illenter;the 100 year-floodplainprior Altho g to reaching SH 6'0, the drainage system should besuch that there is na ne ative impact to downstream properties for the g smaller storms. a I cco Shrle Volk, .Development Review Coordinator ° Y ' David Pullen, City Engineer. Planning file-90-300 o I J ~ l ~ TABLE oF_CONTENTS { _~ ~--~~' I , EXECUTIVE SUMMARY:. ~``~ 1. Introduction _J 2 . Scope and ~bj ectve 3. Conclusion 1 ,_ ~, ~ II. IMPACT. STUDIES i_ 1. Legal Description/Site Description ~ ~ 2. Surrounding Area ~~ 3 . Zoning/Exstng and Proposed Land Uses 4. Water 5. Santary..Sewer ~.~ 6. Storm Drainage 7. Electricity 8. Natural. Gas 9 . Traffic 10. Summary/Recommendations III.. APPENDIXES ,~ ~,' Appendix.:A -Legal Description ~~ Appendix B -Letter Regarding Zoning From City ~~~ ____-i _~ :: _~ t ~- __ ~_ ~ ~ ~~ ,,,' +:~ ~ ~~ ~y4~~ 'yJ L l~ t y I i a j I '1 i _;~ , J I i I ~ . I i ~~ i .,~ ~~ ~~-~ ~~~ ' ~~, ~ ~ ~~ ~'~ __~ `' LIST OF FIGURES ~!~, J Fiure g '_ No . 1 Vicinity Map l ~~--~ 2 City Topographic Map 3 Zoning Map ~,f~, 4A Existing Water Main & Pressure Readings ~~_~ 4B Proposed Watermain Extensions 5A Existing Sanitary Sewer System ,,--~ 5B-D Existing & Proposed.Sanitary Sewage Calculations ~ 6A Highway Department Drainage Area Map - ~~-~ 6B Proposed :Site Drainage Area Map 6C Runof f ~oef f cients m.~ 6D • Rainfall Intensity Chart ~~ ~~J 6E Velocity Chart i ~- ~ ~ ~~_ ,__ { Ali ~ ~~. ~~ _ ~, ',~ ';, , . Page 1 , ~ '1 ,~ !' l ~' I! I. EXECUTIVE SUMMARY. ~~~~ ~---~ 1. Introduction ~~ --- Th report was prepared by Dunaway Associates, inc. ~~ ~DAI} on behalf of Wal-Mart Stores Inc.. forsubmittal to the C-ity of College Station... The report addresses _the ~ ~~ impact of a proposed Sam's Wholesale Club on the City of ` College Station's infrastructure f©r water,, sanitary sewer, storm drainage, electricity, natural gas,, and traffic. The proposed development -is a. 16.00 acre tract of land and a 0.85 acre private access easement ,n the Richard. Carter. League, A-8 College Sta ion, Brazos County, Texan. ~_J 2 .~ Scope and ob; e~ dive r-- ~` The sco e of this re ort is to evaluate the ca aciti.es of _~ p p p existing infrastructure to support the proposed --~ development. The report will identify those existing ~~ capacities relative to the proposed burden anticipated by `~~ the subject develo merit. The ob'ectve will be to J -p 7 _ identify f any facility w 11 become overburdened due to the subject development. ~, L~J 3. Conclusion Based on the m act studies contained herein, it is DAI' s ~ _~ p , conclusion that with the exception of minor utility ;---~ extensions to facilitate thee: subject property; this ~, i ' development will. have no adverse -impact on any- public or ;- private facilities. ~, ~_~ II. IMPACT STUDIES ~;~„- 1. Leaa1 DescriptionjSite Description ~~ ~~ A legaldescription of the property has beenprovided in ---, Appendix A of this report. A ..layman's description c+f the subject property is the northeast corner of the Highway ~ --~ 6 Bypass and Highway 3 0 immediately north and adjacent to theexisting Furrows Building Supply on the frdntage road ~ ~~~ of Highway 6 (see Figure 1 } ~~ The site can-be described as basically rectangul~~r in -,~ shape with. rough dimensions ±65.0 north: and south and ±1, 079 east and west. There is ro osed 50' access drive l ~~ p p from the southeast corner of the property which would run -~ south-for ±600 feet to Highway 30. The property is ~~ bounded by undeveloped property north and east o:f the ~ -' property. Adjacent to the south property fine is Furrows i~ i~ ~~ i '~~ ~~4_ 2. Building Supply, and(west of the property is the east by-pass Hghay'6 frontage road. The subject property has an overall gradient of 1.7%, .the northwest corner of the tract has existing slopes up to 4% while the southeast corner has slopes of about 1.~%. .There is a .raised area that traverees the eastern third of: the tract. Bayed on aerials dating back o 1940, it is our belief that the raised area served as an old farm read to an abandoned homestead immediately northwest of the subject property. DAI site inspection discovered old timbers and steps that appear to be remnants of the house. The house or structure was off of the subject property. The ` site's urf ace :drainage flows from northwest to southeast. There is an existing pond in the northeast corner of the property. The pond was likely used for livestock when the property was agricultural See Figure 2}. The site is undeveloped and ove-rgrown with grasses, cactus, vines, brush, Mesquite, Cedar, Elms, Hackberries, Persimmons, Live Daks and Hawthorne. The site appears to only have bee used for agriculture and livestock. Note: For ease of description plan north and south will be parallel with east by-pass. Highway 6 {referred to hence as Highway: 6} and east and wet will be parallel with -Hghway_30 (See Figure 1} Surrounding Area: North: Immediately north of the subject property is undeveloped property, with tree vegetation and open pastures.- There-is a 9 hole galfcourse presently under construction ±1/4 mile north of he subject property . East: 'Eas of subject property is overhead electrical transmission lines. Immediately east of the transmission line is Carter's Creek flowing from northwest to south-east. .Beyond the creek is property owned by 'T'exas Instruments ~T1I.} and a vacated T.I. facility ~~~~ 1 ~_ ,, South: South of the property is Furrows Building Supply and undeveloped propertye South of .Furrows is State H-ighway 30, beyond State Highway 30 is the wndwood residential subdivision. There is a small drainage ditch flowing east between Furrows. and the subject property. Dunaway As ociates, Inc. obtained a grading plan of the` Furrows Development. All on-site water in the Furrows Development is picked up in 5 area:. drains and discharged into a concrete channel 200 feet north and parallel to Highway 30 Vince the stormwater reaches the channel it; drains east and discharges into Carters Creek. west:: west of the subject-property is the frontage road for Highway 6, beyond the frontage road is Highway 6 West of Highway 6 is a residential subdivision. -The. only .utilities -in the frontage road R.Q.W. immediately in front of the subject property and substantdated by warning signs and maps are .potable water lines and a telephone line. There is an electric line ±200 feet north of the northern property line which ,comes across Highway G from the west. This line imply `ends 1~0-200 feet east of the frontage road. It should also be noted than at the southwest corner of the subject property adjacent Furrows there are three pole mounted electric transformers . 3. Zonn~~Existnq and Proposed Land Uses The proposed development..ste is-zoned General Commercial. C-1 tSee Figure 3). The proposed Sam's Wholesale Club . activities are consistent with the existing zoning district (See Appendix B -letter from the City)-. As mentioned previously, the site is presently undeveloped property with a past history-of rural agricultural use. The proposed..aand. use is for a ±131,000 quare foot Sam's Wholesale Club with the ability to expand to ±159,000 square feet of building area. i -, ,, J ,, ~ ~~~-~ ~ , :~ ~-~- ~ ._~~ t~ i I__ 4. water As shown on Figure 4A, an :existing 18" water main is in .place along the ent~.re 650' of Hghway 6 ~frontageroad. DAI contacted David Pullen with the City of College Station's Engineering Department and verified the fol owing: 1~ The 18 " ma n -is avalable for water .service tap. 2) The e~tmated water demands` for .the '-~proposed~ Sam' s w ill impact the 18"water main negligibly. Fire flaw tests were conducted.. near the ~ site by D~AI in the Fall of 1.994. With a. delivery of 1,150 G.P.M. and a resdual pressure of ~2 P.S.I., indications are. that the existing conditions farexceed themnimumrequire:ments of .water needs for the development of this site. Further, the.anticipated normal daly usage. for this site is calculated. as f of lows 18,848 s. F. at 0.04 Gal. ~5.F.%Day = 6, 354 G.P.D. This projected. water usage is considered a conservative design volume and the possible future expansion has been. included in he calculations. _ The proposedSam's presents no extraordinary load demand upon the existing 18'' supply main. Fire line and fire hydrant requirement .and placement have been considered and are illustrated on Figure 4B. It is DAI's assessment that water demand due to this proposed site imposes negligible impact upon exeting .water delivery facilities. No additional or upgraded delivery lines or production facilities are requ-iced or requested, 5. Sanitary sewer ~ ,_ The existngsanitary sewer system. serving the :immediate area of the subjec$ property is illustrated on Figure 5A. Tn summary, two mains were considered for existing capacity and usage; an 8!' line cro sing _ Highway 3 o now serving Furrows Building supply and a 12" trunk line paralleaing Highway 30 on its south side. The 8" line has a capacity of 341.8 G.P.M. The proposed site combined w-th Furrows generates a otal peak flow of 26.4 Page 5 f'°'' 3 --~ F -- L ~I~ _~ ~ ~- ~~ G.P.M. The 12" trunk line has a capacity of 714.5 G.P.M. The proposed site combined with existing .flows .generates a total peak flow of 136.1 G.P.M. It is theref are he assessment of DAI that the total. peak sewage .load of 18.9 G.P.M. generated by the development of this side) upon the existing sanitary :sewer system. is neglgble~see Figures 5B-D}. 6. Drainage Site drainage, according to the City "Drainage Policy and Desic,~n :.Standards", has been considered with the resulting analysis and design. Natural Run-off There are no springs, brooks or other natural or man-made streams originating on the site or running through the site. Although not in a 10.0. year. f loodplain itself , the site is within 3 00' ± of the f loodplain of Carter. Creek to the eas and. the .South. Natural run-off consists ±6 acres upstream and 16 acres on-site . The total ±2 2 acres discharge with 2 / 3 of the run-.off flowing towards the south and 1 / 3. of the run-of f f lowing to the east . 'These flows continue unobstructed through adjoining properties into the Carter Creek f loodp,lain passing through drainage structures of Highway 30 approximately 700 feet sou h of .the site see Figures 6A-6E). The calculated peak run-off flows from the existing site are as follows Tong the outh property line - 25 Yr. Frequency = 32.1 C.F.S. 100 Yr. Frequency = 37.8 C.FS, Along the east property line 25 Yr. Frequency = 15.7 C.F.S. l0Q Yr.`Frequency = 19.0 C. F. S, Developed Run-Off The effects` _of drainage run-off increase due to development has been _considered and `evaluated as prescribed by the city drainage regulations mentioned .above. Rainfall run-off shall be managed in such a .manner .that .run-off will continue to discharge ire its present route to the southeast corner of the site, The Page 6 ~~ I~-- 4 1 ,_,~j 7. -storm water will then be collected and carried by facility in or along the proposed access road of the site .: The run-of f wi 11 then be directed back to the west to enter an existing 7' x 5' box culvert. The impact of increased run-off from the development of this site will be neutra 1 z ed by entry into the 10 0 year f loodp la in near the site and have little effect upon drainage facilities for Highway 30. The calculated peak developed run-of f concentrated apt the southwest corner of he `site are as follows: 25 Y-r. Frequency = 122.9 C.F.S. 100 Yr. Frequency = 142.1 C1F.S. Electricity Electrical power demand and availability was .discussed with Tany Michalsky, Operations Coordinator at the public uti ites department. DAI Visited the site and confirmed with Tony that electric service is presently looted at -the southwest property corner. Tony indicated the line will simply need to be extended through the subject property either along the frontage road or around the property. Tony indicated adequate power.. service and supply is in place . Except for City forces extending the power into the site and allowing for the continuation of the line to the north, no other requirements wial be needed. Tony indicated no other analysis of electrical power is required. 8. Natural Gas ~_ .Natural gas is ova-ilablethrough.Lone Star Gas which has a 4" main in place along the frontage road in front of Furrow's Bui ding Supply. Mike Brune ndicatedthere was adequate pressure for the pre-.expansion and post- expanson Sam's building. Mike indicated the main .would need to be extended along the frontage of the proposed Sam's development. Mike stated no further analysis would be needed. 9. Traffic i ~_ A complete traffic impact analysis has been prepared by Walton and Associates Transportation Engineers. The traffic impact analysis is being submitted separately to the City and should be considered an.attachment to this report. Page 7 C~ FIGURE 5A ,~ _. PIPE CAPACITIES ,~ ,_j 8" AT 0.4% (CROSSING I-30} _, C = 1- ARZ/3 S1/2 N _..:,1 N = 0.013 ' ~= C 1_~ 4___ 86 X 0.349 X 0.1672:/3 X 0.0041/ ----~ 4 0.013 ~. C = (114.31}(0.349}(.3x3)(0.063} 4~ C = 01762 C.F.S. X 448.831 ~_~ __ C = 341.8 G.P.M. i ,i _~ 12" _ _ AT~0.2% (TRUNK MAIN} _ ~ ~ _ C~ 1.486 2/3 1/2 X0.785X0.25 X0.0..02- ~ ~ ._~ 0013 m, . ; = G 3 7 0.0447 (114.31} (0~78~) (~. 9) ( ) , ,, _J ~~ ~ 1.592 ~.F.~. ~ 448.831 ~ ,,i i ~ I C = 714.5 G.P.M. .j 1 f ;a 1, _ 1 i i i ,~ I ~, ''I __ I i 1 ,i _._ .~ 1 _-~ j ~~ ',_~ _ f ~ - 1 ~ ~ 1 ~ I ---~ i it : ,_. j i iI ~ _.J ~~ ~ i . i II~ .__.,J ,, ~_ ~~ GURE 5D _' ~__..__ ~. ~'i i _,~ ~.i TABLE 5 RUNOFF COEFFICIENTS`- FOR RATIONAL FORMULA , _: ~~ ~ --~ Type of Oralnage Area Runoff Coeffi cient ~. Business: I. ~ I~~v~Lop~'I~ Qowntown areas 0.70-0.95 C = 0.8 r ; _~ Nelghborhoodareas 0.500.70 , Residential: .~ ~,, Single-family areas 0..30-0,50 ~~ Mu i t I -units, detached 0.400.60 Multi-units, atfiached 0,60-0.75 ,I Suburban 0,25-.0.40 a Apartment dwelling areas :0,50-0.70 ~, Industrial: ' i' L1ght areas 0.50-0.60 • Heavy areas 0.6:00,90 '~~'~ Parks, cemeteries 0,10-0.25 ~ 1 Playgrounds , 0.20-0.40 l Railroad yard areas 0.200.40 ~ Unimproved areas 0.10-0,30 _ .Sand or-sandy Ioam so1l, 0-3~ 0.15-0.20. Sand or sandy loam so11, 3-5~ 0.20-0..25 ~~ i ~ ~acl~~'tN+~ Black or loesslal so11 0-3~ 0,18-Q.25 G ~- U.2°~ t ~ ~ Black or Ioessiai sot{, 3-5$ 0.25-0.30 1 B i ack or Loess 1 al so 1 i , > 5~ 0.10-0.80 _~ ~, . Deep sand area' 0..05-0.15. '3 I, _ ~ ' tee rased. sIo es S p ~ P 0,70 ~ Lawns; . ~ Sandy soil, flat 2~ 0.05-0.10. i ~ Sandy soll,.average 2-7~ 0.10-0.15 . __ - ~I Sandy soil, steep, 7~ . . 0,15-0,20. ~~ ~ Heavy so1l, flat 2~ 0.13-0.17 '~ Heavy, soil, average 2-7~ 0.:18-0.22.. , ,,~ I~, ~ _ ~ Heavy soI l , steep, 7~ 0.25-0.35 { - Streets's ~ ' I Asphaltic 0.70-0.95 , '" _--~ Concrete 0.80-0-95 Br1ck 0.70-0.85 ~I , --; Drives and .walks.. 0.75-0,85 _~ Roofs 0.75-0..95 ~~ ~, ~ _~ I' from ASCE, 1960 ~ ~~ __~, li ,~ ,, ~~, ~~.; ~~ ~ _ BRIDOE DIVISION_HYDRAULIC MANUAL 12-85 -7 ~~ ~~ ~~~ 2 - 15 6C. 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' 2 - 16 ~ c ~~~ ~~ ~~ ~ __ 1 I < <.~ __J - -_ , i i _. 2 ,3 ,5 I ~ 3 5 Q 20 ~. _ ~~ ~ 50 ~i0 , ~, ~~ ~ 30 ~~ ~ I ~ '4 ~, q Cx: ~ Q a ~ z . io ~ I a _, _ ~,i a. ~~ o .~..~ c~ ~, ~~ 5 3 V w ` i.. .:~~ _ ~w ~ ~ .. `~ - I ', j i ,.; i -...~ i ,. ~ ~ 5 ~~ -~ .I ,2 ~` .3 .5 I ~ 3 5 10 20 --~ - t _ J .._i 'j _...J .I _ ~ _. .. ~ _ .J ~ - .. I c~ur~a 5 ~ I ~ 1285 BRIDGE UiVLSLUN FIYURAULIC M~INUAL 2Q ~IGIURE 6E