Planning and Zoning Commission recommendation for Parking Ordinance Amendments

Transcription

1 PLANNING & DEVELOPMENT 500 West Furth Street Davenprt, Iwa Office: (563) Fax: (563) T: Dee F. Bruemmer, Cunty Administratr Timthy Huey Directr Frm: Timthy Huey, Planning & Develpment Directr Date: April 19, 2011 Re: Planning and Zning Cmmissin recmmendatin fr Parking Ordinance Amendments Last fall, in September and Octber, the Planning Cmmissin had wrk sessins t discuss prpsed changes t the requirements fr new and expanded cmmercial and industrial develpments t prvide areas n their prperty fr custmer and emplyee parking. The prpsed amendment repeals the entire existing sectin f the rdinance n ff-street parking and replaces it with a new language. The intentin f the Planning Cmmissin was t clarify when the parking rdinance applied, what standards and specificatins were fr parking imprvements and hw mdificatins t the requirements wuld be reviewed. The prpsed rdinance states that all new cnstructin, re-develpment r change f use f cmmercial and industrial prperty that is subject t the requirements f Sectin 6-25 Site Plan Review shall be required t prvide ff-street parking and circulatin areas in accrdance with the requirements f the rdinance. The issues discussed by the Planning Cmmissin regarding prpsed rdinance changes are addressed as fllws: Review minimum parking requirements and base requirement n type f use and size f building rather than number f seats, emplyees, and etc. The prpsed parking requirements are as fllws: Type f Use Number f Spaces Single and tw family dwellings 3 per unit Apartments 2 per unit Senir Residential facilities 1 per unit Churches and assembly facilities 1 per every 3 persns f ccupancy lad General Cmmercial uses 1 per every 500 sq ft grss flr area Outdr recreatinal facilities 1 per every 3 persns f design capacity Retail Sales under 5,000 sq.ft. flr area 1 per every 500 sq ft grss flr area Retail Sales ver 5,000 sq.ft flr area 1 per every 750 sq ft grss flr area Office Uses 1 per every 500 sq ft grss flr area Restaurants and n premise liqur sales 1 per every 250 sq ft grss flr area Industrial uses 1 per every 750 sq ft grss flr area Warehusing 1 per every 1,000 sq ft grss flr area Other uses nt specifically identified 1 per every 3 persns f ccupancy lad

2 Page 2 Mem n Parking Ordinance Amendments April 19, 2011 Clarify what cnstitutes parking and circulatin areas that are required t be paved and what cnstitutes strage areas and can be graveled. Prpsed Definitins f Vehicle Parking and Circulatin Areas and Vehicle Strage Areas clearly defines what cnstitutes a parking lt and is required t be paved and what cnstitutes a strage area and can be gravel. Review paving requirements t mre clearly establish cnstructin standards but als t encurage pervius parking surfaces. The Cunty Engineer recmmends that the Cunty adpt the State Urban Design Standard Manual (SUDAS) fr Parking Lts. Previusly the SUDAS requirement fr subdivisin rads and infrastructure design and specificatins has been included in the Sctt Cunty Subdivisin Regulatins. The SUDAS addresses parking lt layut, pavement design, lading requirements, drainage, landscaping, screening, and lighting. It includes prvisins that state if the lcal rdinances specifically addresses a requirement, the lcal rdinance applies but if it is nt specifically addressed by the lcal regulatins the SUDAS standards are used. Establish requirement t pst perfrmance bnd fr parking imprvements befre certificate f ccupancy is issued. Prpsed amendment includes requirement fr a perfrmance bnd in the amunt f 125% f the cst estimate f paving be psted prir t issuance f an ccupancy permit and that the bnd be held until paving is cmpleted within ne year f ccupancy. Allw exceptins t the parking requirements t be reviewed as a Special Use Permit rather than as a variance. Prpsed amendment states that exceptins r mdificatins t the requirements f the parking regulatins be reviewed under the standard f a Special Use permit by making applicatin t the Zning Bard f Adjustment under the prcedures and criteria f Sectin 6-27 C (2) Special Use Permit Review.

3 URBAN DESIGN STANDARD MANUAL CHAPTER 12 - PARKING LOTS SECTION 1 - GENERAL INFORMATION 1.1 CONCEPT GENERAL INFORMATION This chapter prvides general criteria and guidelines fr ff street parking lts. The majrity f jurisdictins have their wn parking lt rdinances and criteria. Hwever, when variances are requested r when certain elements are nt in current rdinances these guidelines will prvide the parameters. Als, the guidelines may be used as standards fr thse jurisdictins that d nt have rdinances cvering parking lts. In frmulating the guidelines, a wide variety f factrs were cnsidered including zning and parking lt layut. A parking lt is nt usually expected t serve the brad spectrum f traffic, except fr ccasinal use, that streets and highways must serve. Therefre, it is imprtant t determine the type f traffic the lt will be expected t serve. The principal cnsideratins when designing ff street surfaced parking lts are type f traffic, Jurisdictinal setback requirements, handicapped requirements, and strm water runff requirements. 1.2 CONDITIONS 1. The design f parking lts shuld be in cnfrmance with the fllwing: A. AASHTO's plicy n Gemetric Design f Highways and Streets. B. Americans with Disabilities Act/State and Federal Handicapped Standards. C. Cnflict - In case f a cnflict between the abve design standards, the Jurisdictinal Engineer shuld be cntacted fr clarificatin. 2. Cnstructin Standards shall be the mst recent revisin f The Urban Standard Specificatins fr Public Imprvements. 3. Prject submittals - All prjects are t be submitted t the Jurisdictinal Engineer fr review, cmment and apprval. 1.3 GENERAL CRITERIA General planning is an imprtant detail. It shuld be cnsidered when laying ut a parking lt. The fllwing is a list t be cnsidered when designing parking lts: 1. Maximum cnvenient parking capacity t insure the best use f available space: Use rectangular areas when pssible. Make the lng side f the parking area parallel t the main access rad. Design traffic lanes t serve tw rws f parking stalls where pssible. Align the perimeter f the area with parking stalls where pssible. 1 10/20/2009

4 URBAN DESIGN STANDARD MANUAL CHAPTER 12 - PARKING LOTS SECTION 1 - GENERAL INFORMATION 1.3 GENERAL CRITERIA (Cntinued) 2. Develp alternate gemetric layuts. 3. A surface water drainage plan is imprtant and must be designed t include a slpe f.6% minimum with a preferred minimum f 2% n paved surfaces. Parking lts are nrmally designed s sme f the water is cllected internally and is cnveyed away thrugh undergrund systems. Where rainfall runff frm large impervius surfaces must be regulated, parking lts are ften called n t serve as detentin basins. This means that the pavement must stre water fr a perid f time withut incurring any damage due t lss f supprt frm a saturated subgrade. 4. Besides interir drainage inlets and under grund drainage systems parking lts must ften accmmdate ther appurtenances such as: A. Traffic islands and pedestrian ways B. Lighting C. Landscape areas, fencing, and screenings D. Vehicle and trash strage, lading dcks, and cncentratin f fuels and lubricants E. Undergrund utilities Prvisins fr the appurtenances shuld be cnsidered in the planning. and design f the jinting system and layut fr cnstructin. Cnstructin staging is als imprtant. Fr example, undergrund utilities shuld be cnstructed in early stages and cmpacted prperly t prevent future settlement f paved surfaces. 5. Traffic flw int and ut f the parking area as well as within must be studied carefully t allw vehicles (bth large and small) t mve easily and with maximum safety and efficiency. Refer t Chapter 5, Sectin 5 - Access Criteria. 6. Pedestrian mvement in parked vehicle areas must be planned t prvide the highest degree f safety and cnvenience. Refer t the Americans with Disabilities Act/State and Federal Handicap Standards. 7. Where facilities are planned t serve light vehicles and heavier delivery trucks, cntrls r special lanes are usually impsed t separate and channelize the heavier trucks away frm areas designed fr autmbiles and light trucks. Facilities designed fr heavier vehicles are very likely t be thse facilities where relatively accurate predictins f vehicle sizes and numbers are pssible. Thse facilities intended t serve nly light vehicles may have slabs whse thickness is influenced mre by the practical limitatins f the material and the effects f the envirnment than by the stresses impsed by the vehicles. Refer t the specific Jurisdictin where develpment is ccurring fr minimum pavement thickness requirements. If a Jurisdictin has nt set frth requirements then refer t Sectin 4 f this Chapter fr pavement thickness requirements. 2 10/20/2009

5 URBAN DESIGN STANDARD MANUAL CHAPTER 12 - PARKING LOTS SECTION 1 - GENERAL INFORMATION 1.3 GENERAL CRITERIA (Cntinued) 8. Cmmunity and custmer relatins are enhanced by attractive landscaping that includes prper plantings and fencings in screening areas such as trash strage and lading dcks. Refer t Jurisdictin where develpment is ccurring fr the specific landscaping and screening requirements. If a Jurisdictin has nt set frth requirements then refer t Sectin 5.1 f this Chapter fr landscaping and screening requirements. 9. Adjacent parking lts, accessways r cnnectins between lts must be cnsidered in the design. Many times in cmmercial areas supprt between cmmercial business are ignred until after the business is peratinal. This leads t exiting frm ne parking lt t the adjacent street and then entering immediately nt the next parking area. This causes traffic peratinal prblems and may be avided when planned early. The design f a parking lt shuld take int accunt the internal circulatin within the lt. Care shuld be taken t incrprate a scheme where traffic mvement within the lt will be the least impeded and nt affect the traffic n the public street. 10. The future expansin f a parking lt and the facility it serves shuld als be cnsidered in the initial design insfar as additins may affect changes in the traffic pattern and may place heavy vehicles n pavement that was initially intended nly fr light vehicles. Industries and shpping centers served by public transprtatin and schls served by buses are examples f places where expansin may transfrm aut parking areas int truck r bus driveways. 11. The parking angle fr rws f stalls is imprtant. The three mst cmmnly used angles fllw: 45 degree angle - Where lt size restricts the dimensins available fr aisles and stalls a 45 degree angle may be warranted. Since a small change f directin is required frm the traffic lane t the stall, the aisle can be reduced in width. Hwever, this results in lss f sme f the stalls. 60 degree angle - This stall angle is used mst ften due t ease f entering and backing ut and the fact that the traffic lane can be a reasnable width with reasnable install efficiency. 90 degree angle - The main reasn t use this integral is t achieve the highest stall capacity in a parking lt. In mst in and ut lts, the disadvantage such as difficulty f entering the stalls may utweigh the advantage f the high stall capacity. 3 10/20/2009

6 URBAN DESIGN STANDARD MANUAL CHAPTER 12 - PARKING LOTS SECTION 1 - GENERAL INFORMATION 1.3 GENERAL CRITERIA (Cntinued) 12. Fr general planning areas use apprximately 350 square feet per car. This includes ttal space requirements fr lanes. turns and stalls in the preliminary space requirement calculatins. Individual standard stalls are typically 9'x18' as the desirable minimum depending n wner's requirements and whether the facility is attended parked. Stall widths where shppers have large packages, such as supermarkets, shuld be 9.5' r even 10' wide. Smaller stall widths (gruped tgether) may be allwed by Jurisdictins fr preferred attendant parking lts. Als special sectins may be marked ff fr cmpact cars (8'x16') if allwed by rdinances. General tw-way traffic lanes shuld be a minimum width f 24 feet (tw 12' lanes). 13. Entrances and exits require special attentin and are usually clsely cntrlled. Separate entrance and exit driveways shuld be used when pening width is less than 24 feet (tw 12' lanes). The entering vehicles shuld be figured in planning the lcatin f entrances and exits in rder t align these vehicles easily with interir traffic lanes. Refer t Chapter 5 fr driveway separatin and lcatin requirements. The number f driveways and areas within each lt requires careful study t meet the'needs f the wner and legal requirements f the Jurisdictin. Refer t Chapter 5 fr required number f driveways and the lcatin f such within a parking lt. 14. Prper lighting f the parking area is imprtant frm the vehicle and pedestrian, safety and cmmunity relatins standpint. Sme details t cnsider are: Plan the initial lighting installatin s that it can be easily expanded r increased at sme later time. When lighting is required within the interir f the parking lt, installing light ples n a 30" high structural base fr ples lcated n the pavement surface shuld be cnsidered where safety cncerns are an issue, Design lighting in accrdance with Chapter 11, Sectin 2 - Radway Lighting Design, Refer t Table 2.1 fr the recmmended illuminance values and unifrmity ratis fr parking lts. Where pssible any light ples installed in medians r alng the perimeter f the parking lt shuld be ffset a minimum f three (3) feet frm the edge f pavement r back f curb and may nt require bases, 15. Paint striping, markings and signage are imprtant parts f parking lts and include: Lines r stripes, wrds, numbers and symbls. Wrds nting "In" and "Out" and "Stp" may be included. Numbers in the stall may be included. Symbls t direct traffic flw

7 URBAN DESIGN STANDARD MANUAL CHAPTER 12 - PARKING LOTS SECTION 1 - GENERAL INFORMATION 1.3 GENERAL CRITERIA (Cntinued) 16. Curb bumpers and stps are widely used as bundary barriers. Interir bumpers and stps may be a prblem due t maintenance with street sweeping and/r snw remval and must be evaluated n their use. The use f steel ples, such as bllards set in cncrete is discuraged, but may be used fr utility and ther structure prtectin per Jurisdictinal Engineer apprval. 17. Subgrade must be a unifrm select material cmpacted t a cnsistent density. If nt available a granular subbase is t be cnsidered. Reference Sectin 4.2 fr subgrade design requirements. 5 10/20/2009

8 URBAN DESIGN STANDARD MANUAL CHAPTER 12 SECTION 2 PARKING LOTS SITE PROVISIONS SITE PROVISIONS 2.1 GENERAL PROVISIONS 1. The fllwing are cnsidered as guidelines and where a Jurisdictin des nt have an rdinance cvering a certain item the designer can fllw these as a guide. The Jurisdictin als recgnizes that due t additinal needs f certain develpments their rdinance may result in inadequate parking spaces r parking spaces in excess f its needs. The frmer situatin may lead t traffic cngestin r parking vilatins n adjacent streets as well as unauthrized parking n nearby private lts. Therefre, the Jurisdictin may permit deviatins frm the requirements and allw mre parking r less parking whenever such deviatins are likely t satisfy the standard. 2. Unknwn uses fr new buildings are prpsed when the wner r develper des nt wish t designate the type f use that will ccupy the building. The mst intensive use pssible shuld determine the parking requirements. 3. In determining the parking requirements f a business, the designer needs t lk at the maximum emplyment perid in which the greatest number f emplyees are present at the business. If a building cntains tw r mre uses, the parking requirements may be determined by the additin f the parking requirements fr each use. 2.2 RESIDENTIAL Parking shuld be prvided fr single family dwellings, tw family dwellings, and multiple dwellings. All develpments shuld prvide a sufficient number f ff street parking spaces t accmmdate the number f vehicles that rdinarily are likely t be attracted t the develpment. The parking spaces may be designed in accrdance with this manual subject t the Jurisdictin's apprval. The designer shuld refer t the individual Jurisdictin's Zning Ordinance fr the number f required parking spaces per type f dwelling unit. 2.3 COMMERCIAL/OFFICE Off street parking shuld be prvided fr cmmercial uses which include sale and rental f gds, merchandise and equipment. Parking lt requirements fr thse uses are determined by space per square feet f grss flr area. Off street parking requirements fr ffice, clerical, research and service uses nt primarily related t gds r merchandise, are determined by space per square feet f grss flr area. Off street parking requirements fr educatinal, cultural, religius philanthrpic, scial and fraternal uses, are determined by space per classrm r space per grss flr area plus additinal spaces fr emplyees. In sme cases, spaces fr safe and cnvenient lading and unlading must be cnsidered. 6 10/20/2009

9 URBAN DESIGN STANDARD MANUAL 2.3 COMMERCIAL/OFFICE (Cntinued) CHAPTER 12 SECTION 2 PARKING LOTS SITE PROVISIONS Off street parking requirements fr recreatin, amusement, and entertainment facilities are determined by the number f persns the facility was designed t accmmdate, the number f seats within the facility, r spaces per square feet f grss flr area f the facility. Off street parking requirements fr institutinal residence fr care f cnfinement facilities are determined by the number f beds within the facility r the grss flr area f the facility. The designer shuld refer t the individual Jurisdictin's Zning Ordinance fr the specific number f required parking spaces fr the cmmercial/ffice uses. 2.4 INDUSTRIAL Off street parking requirements fr industrial uses include warehuses and manufacturing prcess in creating, repairing, renvating, painting, cleaning gds and equipment. Parking requirements fr industrial uses are usually brken dwn if walk-intrade is allwed r nt. Parking requirements fr walk-in-trade facilities are typically determined by space per square feet f grss flr area. Parking requirements fr nnwalk-in-trade facilities are typically determined using ne space per emplyee n maximum shift. The designer shuld cntact the Jurisdictin in regards t the specific number f required parking spaces fr the industrial use. 2.5 PUBLIC Off street parking requirements fr public uses include gvernment facilities such as city halls, fire statins, curthuses, public wrks buildings and maintenance facilities. The parking requirements are typically based n number f emplyees per maximum shift plus the number f public vehicles parked at facility. The designer shuld cntact Jurisdictin fr specific rdinances fr required spaces per public uses. 7 10/20/2009

10 URBAN DESIGN STANDARD MANUAL CHAPTER 12 - PARKING LOTS SECTION 2 - SITE PROVISIONS 2.6 LOADING REQUIREMENTS If the Jurisdictin des nt have an rdinance n a specific requirements f a use the fllwing parking requirements can be used as a guide. Parking Lt Stall Requirements Land Use Residential SinQle-Family *Multifamily Tw-family dwelling Rw dwellings Multi(lle dwellings Hspital AuditriumlTheater/Stadium RestaurantlTaverns/Night Clubs Industrial Manufacturing Plants Mini-warehuse Church Retail Stres, Shps, Super Markets 0-4,000 SF (withut gas) 0-4,000 SF (with gas) 4, ,000 SF ver 200,000 SF Office Htels/Mtel Elementary & Intermediate Schl High Schl Business, Trade & Cllege/University Spaces/Unit 2.0/Dwelling 1.0lDwelling Unit 1.0lDwelling Unit 1.5/Dwelling Unit 0.2/Bed plus 0.5/Emplyee plus 0.5/Dctr 0.3/Seat 1.0/150 GFA 0.5/Emplyee n maximum wrk shift plus 1/400 SF ffice space 0.1/Strage spaces plus 1/caretaker plus 5 fr custmers 0.3/Seat 1/400 GFA 1/300 GFA 1/200 GFA plus specified use requirements ther than retail GFA 3.3/1000 GFA 1.0/Rm plus 0.5/Emplyee 0.5/Emplyee plus 10 spaces fr visitrs 0.5/Emplyee plus 0.1/student 0.5/emplyee plus 0.2/student GFA, sq. ft. f grss flr area GLA, sq. ft. f grss leasable area SF, sq.ft. * Designer may desire t add additinal spaces fr visitr/guest parking such as 1 space per fur units. 8 10/20/2009

11 URBAN DESIGN STANDARD MANUAL CHAPTER 12 SECTION 2 PARKING LOTS SITE PROVISIONS 2.7 PARKING LOT SETBACK REQUIREMENTS The designer shall refer t the individual Jurisdictin's Zning Ordinance fr parking lt setback requirements. If n such rdinance exists then refer t the fllwing general setback requirements. Setback Ntes Residential Parking Lt Lcatin (ft) I n all Residential Districts (frm street ROW) 10 2,3,4 Alng alley line acrss frm a Residential District 5 1,2,3 Alng adjacent a Residential District prperty lines 10 2,3 Alng adjining a Residential District parking lts 5 2,3 Alng adj acent Cmmercial r Industrial District 0 2, 3 prperty Jines Ntes: (1) N setback required when use is a single family, a duplex r when the use is acrss frm a parking lt. (2) Setback area shuld cnsist f a permeable material and shuld be landscaped. (3) N vehicle shall encrach int a required setback. (4) Parking n driveways parallel t a public sidewalk fr single family residences shall maintain a minimum setback f 10 feet frm t he Public Street Right f Way. Setback Ntes Cmmercial/Industrial Parking Lt Lcatin (ft) Alng alley lines brdering a Residential District 5 1,2,3 Cmmercial 0 r Industrial Dist rict abuts a Residential 10 2, 3 District Cmmercial r Industrial District abut s a Residential 5 2, 3 District parkinq lt Adjacent t a Cmmercial r Industrial District prperty 0 2, 3 line Office and Cmmercial Districts 15 2,3,4 Light Industrial and General Industrial Districts 10 2,3,4 Business Park and P rfessinal Cmmerce P ark 20 2,3,4 Districts NOTES: (1) N setback required alng that prtin f an alley acrss frm a residential parking lt. (2) Setback a rea sh all cnsist 0 f a permeable material and sh all be landscaped. (3) N vehicle shall encrach int a required setback. (4) Setback frm Public Street Right f Way. 9 10/20/2009

12 URBAN DESIGN STANDARD MANUAL CHAPTER 12 - PARKING LOTS SECTION 3 - LAYOUT DESIGN CRITERIA LAYOUT DESIGN CRITERIA 3.1 ACCESS/ MANEUVERING/CIRCULATION Off street parking lts shuld be designed t accmmdate traffic vlumes and pedestrian circulatin based n the land use served. The use f islands, medians and curbing is encuraged t eliminate parking spaces frm traffic and pedestrian circulatin areas. Handicap stalls shall be prvided as required by the Cde f Iwa. Spaces at parking lt access pints shall be terminated except at ne and tw family dwelling units. All ff street parking areas shall prvide a curb r wheel barrier arund its entire perimeter unless a walkway r brder is prvided. When adjacent t required setback and adjining prperty lines, wheel barriers r curbs shall be lcated tw feet frm the edge f setback areas r prperty lines. 3.2 STANDARD SPACE DIMENSIONS 1. The standard-size parking stall shuld be at least nine (9) feet wide and eighteen (18) feet lng. Refer t figures in Sectin 3.3. STANDARD-SIZE CAR REQUIREMENTS STANDARD AASHTO Degree f Stall Width Curb Length Stall Depth Stall Length Aisle Width Island Width Angle 1-Way/2- A B C D Way F E 0 8.5' 23' '/24' ' 12.7' 19.8' 19' 13'/13' 33.2' 60 9' 10.4' 21' 19' 18'/18' 37.4' 90 9' 9' 18' 18' 24'/24' 36' 2. If parking stalls fr cmpact cars are allwed the stall dimensins shuld be at least seven (7) feet six (6) inches wide and sixteen (16) feet lng. Refer t figures in Sectin 3.3. STANDARD COMPACT CAR REQUIREMENTS Degree f Stall Width Curb Length Stall Depth Stall Length Aisle Width Island Width Angle 1-Way/2- A B C D Way F E 0 7.5' 16' '/24' ' 11.3' 17' 16' 13'/13' 28.3' 60 8' 9.2' 17.8' 16' 18'/18' 31.7' 90 8' 8' 16' 16' 24'/24' 32' /2009

13 URBAN DESIGN STANDARD MANUAL CHAPTER 12 - PARKING LOTS SECTION 3 - LAYOUT DESIGN CRITERIA 3.3 TYPICAL GEOMETRIC DRAWINGS Enclsed are typical drawings that illustrate accepted practices in the gemetric design f the lanes and stalls f a parking lt as presented in this sectin. FIGURE STRAIGHT-IN (90') PARKING '- I!, FIGURE ANGLE (45' AND 60') PARKING ~\~'~,~~~~\\:~\~>"\<:'~\~(\:;'~'~~;;J~';~:7\:~~\\ \/,\.,./~<~/\/'\/A\./,\>../),./ \,~t:,. /'\ /'\/:j ~f;' r,/, ~ <: I -~ ',' ~ ~t~lz)2z5'''p.,, ;t/)i'i~1zt;l) '~~',,'I',i,i -45'MlNV "'I!! I~ Jj i' '; I 'y~"'j,j-.,./'y fj"'-/ ; ", ~ i. FIGURE 3.3 PARALLEL (0') PARKING 1 j 11 10/20/2009

14 URBAN DESIGN STANDARD MANUAL CHAPTER 12 - PARKING LOTS SECTION 4 - SURFACE DESIGN 4.1 GENERAL SURFACE DESIGN Any ff street parking areas included in any parking lts fr mre than fur vehicles shall be surfaced with a flexible r rigid pavement. Fr ff street parking f 4 stalls r less a dust free surface must be prvided. Parking lts shuld be graded and drained as t dispse f all surface water cumulated within the area and shuld be arranged and marked as t prvide fr rderly and safe lading r unlading and parking and strage f self prpelled vehicles. 4.2 SUBGRADE DESIGN 1. Subgrade preparatin shuld be in accrdance with the mst recent versin f the Urban Standard Specificatins fr Public Imprvements. 2. Refer t Getechnical Reprt fr engineering analysis and recmmendatins (Chapter 6 - Sectin 3) fr the design f the subgrade. 3. Grading and cmpactin f the area shuld be cnstructed s as t eliminate yielding r pumping f the sil. The subgrade must be unifrm and cmpacted t 95% Standard Prctr Density with the misture and density cntrl thrughut fill areas and a minimum f ne ft deep in cut areas. If unifrmity is nt pssible a granular subbase must be cnsidered. See Figure 4.1 and All undergrund utilities shuld be prtected r relcated prir t grading. FIGURE SUBGRADE WITH UNIFORM SELECT SOILS COMPACT WITH MOISTURE DENSITY CONTROL TP - THICKNESS OF PAVEMENT SEE SECTION /20/2009

15 URBAN DESIGN STANDARD MANUAL CHAPTER 12 - PARKING LOTS SECTION 4 - SURFACE DESIGN 4.2 SUBGRADE DESIGN (Cntinued) FIGURE SUBGRADE WITHOUT UNIFORM SELECT SOILS ~ 2'~.:, ;..:;.; :':; :f'~~b,1i;:~(:. ::\.:.::...:. 2' I+- TP t t TGS COMPACT WITH MOISTURE DENSITY CONTROL l' ~~~~~~~~~~~~~ TP - THICKNESS OF PAVEMENT SEE SECTION 4.4 TGS - THICKNESS OF GRANULAR SUBBASE SEE SECTION 4,4 SUBDRAIN 4.3 DRAINAGE CONSIDERATION 1, Off street parking areas shuld be graded and drained as t dispse f all surface water accumulatin within the area, All required ff street parking areas shall be s designed that surface water will nt drain ver any sidewalk r adjacent prperty, A Strm Water Drainage and Management Plan sh all be perfrmed fr new ff street par king areas, Thi s plan may i nelude detentin areas within the parking lt. 2, Off street par king ar eas sh uld be des igned and imprved with grades nt t exceed a 6% slpe, Parking a rea surfaces shuld have a minimum s lpe f 0,6% with a pr eferred minimum 0 f 2 %. Driveways are recmmended nt t exceed an 8% slpe, Driveways shall be graded and dr ained t di spse 0 f surface water t the street r publ ic designated strm water drainage facilities. Driveways shall be designed and cnstructed in accrdance with the Urban Standard Specificatins fr Public Imprvements. 3, Subbases cmprised f granular material shuld incrprate a subdrain system, The subdrain shall allw adequate drainage frm the parking area subbase s as t prevent saturatin; thereby, lsing strength and stability, making the verlying pavement st ructure su sceptible t 0 br eakup und er impsed lads. S ubdrains shall meet the Urban Standard Specificatins fr Public Imprvements, 13 10/20/2009

16 URBAN DESIGN STANDARD MANUAL CHAPTER 12 - PARKING LOTS SECTION 4 - SURFACE DESIGN 4.4 RIGID AND FLEXIBLE PAVEMENT DESIGN The pavement thickness fr parking areas ccupied by auts and small trucks fr rigid (Prtland Cement Cncrete Type C) and flexible (Ht Mix Asphalt, Type A aggregate) pavement shuld be in accrdance with the fllwing table. It shuld be nted that the layer f aggregate used as the subbase, is t be drainable. The design life is cnsidered t be based n a 20 year life. If a design life f greater r less than 20 years is desired the Design Engineer shuld refer t Chapter 5, Sectin 4 fr pavement thickness determinatin. A. Areas Subject t Light Lads TABLE 4-1. Thickness Chart: Parking Lts with 200 r Less Auts/Day and/r 2 r Less Trucks/Day r Equivalent Axle Lads. Subgrade CBR In tw lifts. PARKING AREAS ONLY Pavement Thickness in Pavement Thickness in inches n l' Surface inches n l' f Prepared f Prepared Sil Subgrade with 4" Material Unifrm Sil Subgrade Granular Subbase Minimum Desirable Minimum Desirable Rigid Flexible RiQid Flexible Rigid Flexible If sils test are nt available t determine the CBR value and unifrmity f the sil (befre and after cnstructin) a CBR value f 3 and a nnunifrm subgrade shuld be assumed. B. Areas subject t Mderate Lads Table 4-2. Thickness Chart: Parking Areas. Entrances. Perimeter Travel Lanes. and Frntage Rads Subject t 201 t 700 Auts/Day and/r 3 t 50 Trucks/Day (r Equivalent Axle Lads). MODERATE LOADS Pavement Thickness in Pavement Thickness in inches n l' f inches n l' f Prepared Prepared Sil Subgrade with Granular Subgrade Surface Unifrm Subgrade Subbase CBR Material Pavement Minimum Desirable GranUlar Minimum Desirable Subbase 9 Rigid Flexible RiQid Flexible Rigid Flexible In tw lifts

17 URBAN DESIGN STANDARD MANUAL CHAPTER 12 - PARKING LOTS SECTION 4 - SURFACE DESIGN 4.4 RIGID AND FLEXIBLE PAVEMENT DESIGN (Cntinued) C. Areas Subject t Mderately Heavy Lads The pavement fr ent rances, pe rimeter travel lanes, frntage rads, trash dumpster si tes, and del ivery t ruck par king, as well as the appr ach a reas t these spaces, must be increased i n thickness t 0 prevent pavement failure caused by weight and dynamic lading. These areas shuld be cnstructed with prtland ce ment c ncrete ina thickness that will su pprt t his special type 0 f pavement lading. Fai lure t 0 pr vide t his strengthening ca n result i n se vere pavement failure. The pavement thickness in these a reas shuld be in accrdance with the fllwing table: Table 4-3. Thickness Chart: Heavily Laded Areas in Parking Lts with 701/Auts/Day t AutslDay and/r 51 t 100 TruckslDay (r Equivalent Axle Lads). HEAVY LOADS Pavement Thickness in Pavement Thickness in inches n l' f Prepared Subgrade Surface inches n l' f Prepared Sil Subgrade with Granular Subbase CBR Material Unifrm Sil Subgrade Thickness f Pavement Minimum Desirable Granular Subbase Minimum Desirable 9 Rigid Flexible' RiQid Flexible' Rigid Flexible' , In tw lifts. D. Areas Subject t Heavy Lads Industrial parking lts/truck stps, and thse areas designed primarily fr trucks, require a thicker pavement than the ther lcatins described in this chapter. The pavement thickness fr parking lts with heavy truck parking shuld be i n accrdance with the fllwing table: (Nte: Fr thse parking lts greater than 200 trucks/day will require pavement determinatin) Table 4-4. Thickness Chart: Industrial Parking Lts fr Heavy Truck Parking with Greater Than 4,500 Auts/Day and/r 101 t 200 Trucks/Day (r Equivalent Axle Lads). INDUSTRIAL PARKING LOTS Pavement Thickness in Pavement Thickness in inches n l' f Prepared Subgrade Surface inches n l' f Prepared Sil Subgrade with Granular Subbase CBR Material Unifrm Sil Subgrade Thickness f Pavement Minimum Desirable Granular Subbase Minimum Desirable 9 Rigid Flexible' Rigid Flexible' RiQid Flexible' , In tw lifts

18 URBAN DESIGN STANDARD MANUAL CHAPTER 12 - PARKING LOTS SECTION 4 - SURFACE DESIGN 4.5 DUST FREE SURFACE (FOUR STALLS OR LESS) Parking lts having fur r less stalls and having a gravel surface shuld be treated with emulsified asp hall. The treatment, c nsisting f tw appl icatins emulsified asp halt, shall be applied t the gravel surface at a rate f 0.2 galln per square yard. A perid f at least 24 h urs with n rain shall separate the tw applicatins. T he wner f the lt needs t inspect fr a dust free surface and must repeat the appl icatin f emulsified asphalt when needed. 4.6 CURB AND GUTTER OPTIONS 1. Where pssible ff street parking areas and assciated driveways, access radways, and frntage rads, ex cept fr si ngle family attached and detached residences, shuld be c nstructed with permanent, integrally attached, cntinuus cncrete curbing f at least six inches high and six inches wide. 2. All c ncrete cu rbing sh all be at I east three feet frm any wall, fence, pr perty line, walkway, r structure where parking and/r driveways r aisles are lcated theret. 3. All c ncrete cu rbing sh all be desi gned and c nstructed in acc rdance with the Urban Standard Specificatins fr Public Imprvements. 4. Prefabricated cu rbs r wheel bar riers (if per mitted by Ju risdictin) sh all be lcated tw feet frm the edge f the pavement f setback area. 5. Vehicular verhang areas adjacent t setback areas shall cnsist f a permeable material /20/2009

19 URBAN DESIGN STANDARD MANUAL CHAPTER 12 - PARKING LOTS SECTION 4 - SURFACE DESIGN 4.6 CURB AND GUTTER OPTIONS (Cntinued) Figure 4.1: Cncrete curb and gutter shuld be used when strm water flw is desired t flw tward the curb. 2.5' GRADE 7.5" I ~'~ I'R I r- 1/4" : -~ / CONSTRUCTION JOINT IS REOUIRED WI TH ASPHALT PAVEMENT. / pee PAVEMENT SURFACE CAN 8E CONTIGUOUS. Figure 4.2: Cncrete curb and sidewalk cmbinatin shuld be used when strm water flw is desired t flw away frm curb. SIDEWALK 1/4"/FT. S~ tf5 CONT. 1/2" R -'-'8"--'_~!-! ' 1/2" EXPANS:ON JOIN W~~RE A~~ACEN- Te CONeRE TE 0\1 1_ Y 17 10/20/2009

20 URBAN DESIGN STANDARD MANUAL CHAPTER 12 SECTION 5 PARKING LOTS REQUIRED AMENITIES REQUIRED AMENITIES 5.1 LANDSCAPING AND SCREENING GUIDELINES 1. Landscaping: The Designer sh all refer tt he individual Ju risdictin Zni ng Ordinance fr parking lt landscaping requirements. If n such rdinance exists then the requirements set frth in this sectin shall be used. It is desired that all parking areas be aesthetically imprved t reduce btrusive characteristics which ar e inherent t 0 their use. Therefre, wherever practical, such parking areas shuld be effectively screened frm general public view by incrprating the natural landscape and tpgraphy. A II parking areas shuld include landscape ar eas, islands, scr eens, et c., equal t 0 nt I ess than ten percent (10%) f the ttal paved area. Landsc aped islands within the parking area shuld be grund cver f grass (Le. sd), shrubs r ther acceptable living plant life, unless an alternate grund cver is specifically apprved as part f the site plan review by the Jurisdictin. Landscape islands shuld nt be I ess than a minimum f eight feet (8') in width frm back f curb t back f curb, landscape planters a minimum six (6') feet in diameter, and n par king sp ace sh uld be greater than se venty five (75') feet frm a I andscaped pen space. Parking spaces shuld be se parated frm any adjining radway, by a landscaped island r elevated separatin (Le., sidewalk) f am inimum f nine (9') feet in width except alng the radway r parking bay aisle that prvides the direct access. Earthberming shuld be a minimum f three (3) feet abve the tp f curb f the adjining par king lt, i f appl icable, r publ ic thrughfare, and sh uld be designed t nt negatively affect the drainage and sight distance f the surrunding area and t be aesthetically pleasing t the general public. Berms may be required t be higher if the minimum height is identified during the develpment review prcess as being inadequate t prvide effective screening and buffering. 2. Screening: T he Designer shall refer t the individual Jurisdictin's Zning Ordinance fr par king lt scr eening requirements. I f n su ch 0 rdinance ex ists then the requirements set frth in this sectin may be used. Screening may cnsist f ne r any cmbinatin f the fllwing: Wd r masnry walls r fences. Landscaped earthen berms. Plant materials f such size, branching density, spacing and quantity t prvide a minimum f 60% pacity while drmant. Such materials shuld prvide screening functin within three grwing se asns after t he initial planting. Fai lure t accmplish su ch functin, whether d ue t slw grwth, death, r ther reasn, shall be grunds fr requiring the additin f wd r masnry walls r fences. In sme Jurisdictins a published list may be available f apprved materials. Any changes t this list must be made by a certified Landscape Architect

21 URBAN DESIGN STANDARD MANUAL CHAPTER 12 SECTION 5 PARKING LOTS REQUIRED AMENITIES 5.1 LANDSCAPING AND SCREENING GUIDELINES (Cntinued) 5.2 LIGHTING A. Parking Lts in Residential Districts: 1. A six ft high paque screen shuld be installed and maintained when a residential par king a rea abu ts anther residential di strict except in any required frnt yard set back area. N screening is required when said residential parking area abuts anther parking area r a nn-residential district. 2. A three ft high paque screen may be installed and maintained alng each all ey and street I ine when t he pr emises is lcated acrss the street 0 r alley frm any residential district. N screening is required when said residential parking area is lcated acrss the street r alley frm anther parking area r frm a nnresidential district. B. Parking Lts in Cmmercial and Industrial Districts: 1. A six ft high paque screen shuld be installed and maintained when a c mmercial and industrial parking lt ab uts a residential district. Ns creening is required w hen sa id c mmercial and industrial par king a rea abuts anther par king area r a nn - residential use. 2. A three ft high paque screen shuld be installed and maintained alng each alley and st reet line when the premises is lcated acrss the street r alley frm any residential district. N screening is required when said cmmercial and industrial parking area i s lcated acr ss the st reet r alley frm ant her par king area r frm a nn-residential district. 3. A three ft high paque screen shuld be installed and maintained alng adj ining residential di strict. N 0 scr eening is required when adjining use is nn-residential r parking. If required, all lighting used t illuminate ff-street parking areas shall be s shielded r therwise ptically cntrlled s as t prvide glareless illuminatin in such a manner as nt t create a nuisance n adjacent "Residential" District prperty. Design lighting in accrdance with Chapter 11, Sectin 2 - Radway Lighting Design. Refer t Table 2.1 fr the recmmended illuminance values and unifrmity ratis fr parking lts /20/2009

22 URBAN DESIGN STANDARD MANUAL 5.3 MARKINGS CHAPTER 12 SECTION 5 PARKING LOTS REQUIRED AMENITIES The lcatin f each parking space and direct traffic flw shall be identified by surface markings and shall be maintained s as t be readily visible at all times. As specified in the Manual n Unifrm Traffic Cntrl Devices (MUTCD). parking n public streets shall be marked ut by using white traffic paint, except fr dangerus areas, which shuld be marked in yellw. Hwever, yellw lines are cmmnly used in ff-street parking lts. All pavement striping shuld be 4 inches in width. Cld applied marking tape can als be used. 5.4 WALKWAYS Refer t Chapter 8 - Recreatinal Trails & Sidewalks /20/2009

23 URBAN DESIGN STANDARD MANUAL CHAPTER 12 - PARKING LOTS SECTION 6 - DESIGN REFERENCE MATERIAL 6.1 DESIGN REFERENCE MATERIAL DESIGN REFERENCE MATERIAL 1. American Assciatin f State Highway and Transprtatin Officials. 2. Federal highway Administratin. "Manual n Unifrm Traffic Cntrl Devices" and "The Traffic Cntrl Devices Hand Bk". 3. Natinal cmmittee n Unifrm Traffic Laws and Ordinances. "Unifrm Vehicle Cde" (UVC). 4. McGraw-Hili "Time-Saver Standards fr Landscape Architecture". 5. Iwa Department f Human Services Guidelines. 6. Iwa Cncrete Paving Assciatin, "P.C. Paving Manual", and "Cncrete Paving Technlgy". 7. "Asphalt Paving Design Guide", Iwa Asphalt Paving Institute. 8. "Sils Manual fr Design f Asphalt Pavement Structures", The Asphalt Institute /20/2009

24 SCOTT COUNTY ORDINANCE NO. 11- AN ORDINANCE TO AMEND CERTAIN PROVISIONS AND SECTIONS OF CHAPTER 6 SCOTT COUNTY CODE, THE REVISED ZONING ORDINANCE FOR UNINCORPORATED SCOTT COUNTY, IOWA RELATIVE TO THE REQUIREMENTS TO PROVIDE ADEQUATE OFF-STREET PARKING. BE IT ENACTED BY THE BOARD OF SUPERVISORS OF SCOTT COUNTY IOWA: Sectin 1. Amend Sectin 6-5. DEFINITIONS t add the fllwing definitins: VEHICLE PARKING AND CIRCULATION AREAS: The areas n a lt r parcel where mtr vehicles f custmers, emplyees, visitrs r building ccupants park n a day t day basis. This includes all areas where vehicles are permitted t park, lad and unlad and circulate frm the adjacent street r rad t the building r facility n the prperty including, marked parking stalls, access lanes and driveways. All such areas must meet the Iwa Statewide Urban Design and Specificatins (SUDAS) Chapter 12 Parking Lts Sectins 1-6 (Current Editin). VEHICLE STORAGE AREAS: The areas n a lt r parcel t which access is limited and cntrlled by fencing, gates r ther means where vehicles, equipment and ther materials are stred fr extended perids f time. Such areas are nt required t meet the Iwa Statewide Urban Design and Specificatins (SUDAS) Chapter 12 Parking Lts Sectins 1-6. Sectin 2. Delete the existing Sectin VEHICULAR PARKING AND LOADING PROVISIONS and replace with the fllwing: Sectin 6-23 OFF-STREET VEHICULAR PARKING REQUIREMENTS A. Off-street parking required: All new cnstructin, re-develpment r change f use f prperty subject t the requirements f Sectin 6-25 Site Plan Review shall be required t prvide ff-street parking and circulatin areas in accrdance with the requirements set frth as fllws: (1) Off-street parking spaces shall be prvided using the fllwing guidelines: a. Single and tw family dwellings 3 per unit b. Apartments 2 per unit c. Senir Residential facilities 1 per unit c. Churches and assembly facilities 1 per every 3 persns f ccupancy lad d. General Cmmercial uses 1 per every 500 sq ft grss flr area e. Outdr recreatinal facilities 1 per every 3 persns f design capacity f. Retail Sales under 5,000 sq.ft. flr area 1 per every 500 sq ft grss flr area g. Retail Sales ver 5,000 sq.ft flr area 1 per every 750 sq ft grss flr area h. Office Uses 1 per every 500 sq ft grss flr area i. Restaurants and n premise liqur sales 1 per every 250 sq ft grss flr area j. Industrial uses 1 per every 750 sq ft grss flr area k. Warehusing 1 per every 1,000 sq ft grss flr area l. Other uses nt specifically identified 1 per every 3 persns f ccupancy lad

25 (2) Additinal parking and circulatin areas All areas used fr parking and circulatin in excess f the abve minimum required shall be cnstructed in accrdance with the requirements f this Sectin (3) Accessible parking spaces required: Accessible parking spaces shall be prvided in accrdance with the requirements f the current editin f the Americans with Disabilities Act Accessibility Guidelines (ADAAG). (4) Cnstructin and design standards: Parking and circulatin areas shall be designed and cnstructed in accrdance with the Iwa Statewide Urban Design and Specificatins (SUDAS) Chapter 12 Parking Lts Sectins 1-6 (Current Editin).. (5) Cmpletin r surety required Prir t the issuance f certificate f ccupancy all imprvements required in accrdance with this sectin must be cmpleted r a perfrmance bnd be psted in an amunt equal t 125% f the cst estimate f the required imprvements t assure cmpletin f the imprvements within ne (1) year f ccupancy. B. Strmwater management: Strmwater runff frm parking and circulatin areas shall be cntrlled in a manner apprved by the Cunty Engineer and designed and cnstructed in accrdance with the Iwa Statewide Urban Design and Specificatins (SUDAS) Chapter 12 Parking Lts Sectins 1-6. Strmwater detentin facilities sufficient t capture the runff f a ne hundred (100) year strm shall be placed n the prperty. The release rate f strm water ut f the detentin facility shall be restricted s as nt t exceed the vlume prduced by a five (5) year strm when measured at the pre-develped flw rates. The velcity f the water leaving the prperty shall be reduced s as nt t cause ersin. A drainage easement is required where strm water frm a prperty crsses an adjacent prperty t reach a natural stream r public drainage facility. Enclsed strm sewers require Cunty Engineer apprval. If an acceptable pervius paving system is used the requirement t prvide n-site strmwater detentin can be eliminated. C. Exceptins: Any exceptins r mdificatins t the requirements f the parking regulatins shall be reviewed using the criteria established fr the review f a Special Use Permit by making applicatin t the Zning Bard f Adjustment under the prcedures and criteria f Sectin 6-27 C (2) Special Use Permit Review. Sectin 3. The Cunty Auditr is directed t recrd this rdinance in the Cunty Recrder's ffice. Sectin 4. Severability Clause. If any f the prvisins f this Ordinance are fr any reasn illegal r vid, then the lawful prvisins f this Ordinance, which are separate frm said unlawful prvisins shall be and remain in full frce and effect, the same as if the Ordinance cntained n illegal r vid prvisins. Sectin 5. Repealer. All rdinances r parts f rdinances in cnflict with the prvisins f this rdinance are hereby repealed.

26 Sectin 6. Effective Date. This Ordinance shall be in full frce and effect after its final passage and publicatin as by law prvided. Apprved this day f 2011 Tm Sunderbruch, Chairman Sctt Cunty Bard f Supervisrs Rxanna Mritz Cunty Auditr