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Home My WebLink AboutSDP200900060 CalculationsADDITIONAL STORMWATER CALCULATIONS V1 t as 6 N J T. 0 C r , , ..._. a)0 17 r • _t F-) cz"CC T. WZmCCD C.) Q) a) r,m a)a) C_W'CC- 1,', , [1,.;,,cud , Itkinf , ' rr a) u1.--•O so a;mo,d 3U l IPAior,..i t E St 7) D)rz m E) ua. 1,c C 8- .5a)rt -,,,-. z.• cc Li:c) c00ci:i ca CD c--. ;-• o 5IA t.1JE 0_ td,0 pibc ci. ,E 1 o c, c.) ra 0 0 • w c5;.,Jult)oi CD 0u: 6 _ a )n - 7 -4 § . ' 2 -g a) a) cn Ap .):4J4E UOIIEJ S1101fJOCittli c 1) ( 1) r1.)JD 0 CO C C E -0 4--•0 0 6 In 0 c r.0t, .0 1,0i (0i . S'1,1',J, IL. 1 i s. a. CZ —0 fa 0 E T1-cp_ -o E 715 CO a)I Sag:A: Li UWE Of5U:11U.Jj 0110 a)c c) -c:_- eL 2 Ica 00u s::, • 0 a) al - (7) a)f) 2 0 c0 D 0 o E ca a.) Lu 2 :-th a;E5 1- ca c..) cc 0 a) 1—Y) 1), 1.01 1 ? ". ! i,r Ei LOT M - TIA EXPALNTION LETTER Martha Jefferson Hospital Lot M Traffic Evaluation Lot M is a surface parking lot with 56 parking spaces located off of State Farm Boulevard between Peter Jefferson Parkway and Willis Road. Access to Lot M is right -in and right -out only with no median break on State Farm Boulevard. There are no internal vehicular connections between Lot M and other adjacent parking lots. The total number of parking spaces provided for the entire site is 1,357 spaces so Lot M is approximately 4% (56/1357) of the total. The total estimated daily traffic for Lot M is 387 vehicles per day (VPD). This represents a small 3.8% 387 /10,183) of the total vehicle trips generated by the Martha Jefferson complex (including the hospital and medical office building) for Phase 1, While a peak hour volume of Lot M is not specifically given, in the field of traffic engineering, 10% of daily traffic volume is generally a reasonable indicator. Therefore, Lot M would have an approximate peak hour activity of 39 vehicles per hour (VPH) using this calculation method. In addition from the ITE Traffic Engineering Handbook (5 Edition), Table 14 -1 lists typical peak hour volumes as a percentage of total parking spaces for various types of and uses. For medical office, morning peak hour is 40 -60% inbound and 10 -20% outbound and the afternoon peak hour is 10 -30% inbound and 60 -80% outbound Using the middle range of these percentages yields the following volumes for Lot M: Morning (A.M.) peak hour: 28 VPH inbound, 8 VPH outbound, 36 VPH total Afternoon (P.M.) peak hour: 11 VPH inbound, 39 VPH outbound, 50 VPH total The morning and afternoon calculations of 36 and 50 VPH above are in a similar range to the 10% calculation of 39 VPH. The VDOT Chapter 527 Traffic Impact Study regulations state that a study is required at the site plan level for non - residential sites generating over 250 VPH or 2,500 VPD. The whole Martha Jefferson complex well exceeds these limits while Lot M individually does not. A traffic impact study for the Martha Jefferson complex and surrounding outparcels was completed in 2003 by Wilbur Smith Associates. That study included multiple analysis scenarios including a larger build out of the hospital and medical office building equaling 950,000 square feet and 220,000 square feet, respectively. RK &K performed an evaluation of the Lot M entrance at State Farm Boulevard to calculate the traffic level of service and delay experienced during the highest peak hour which corresponds to the afternoon P.M.) peak Traffic volume for northbound State Farm Boulevard is based on a March 12, 2009 traffic count at the nearby State Farm Boulevard and South Pantops Drive intersection and then included generated traffic for the year 2011 full build out condition of the Martha Jefferson Hospital complex including all sub - parcel developments. The trip generation information was obtained from the March 2003 traffic impact study prepared by Wilbur Smith Associates. The following is a summary of the afternoon peak hour traffic analysis of the Lot M entrance at State Farm Boulevard. The analysis was conducted using the Highway Capacity Software (HCS) program for unsignalized intersections. State Farm Boulevard at Lot M (PM Peak) Northbound Through State Farm Boulevard: 625 VPH Northbound Right Into Lot M: 11 VPH Westbound Right Out of Lot M: 39 VPH LOS B+ (delay of 10.2 seconds per vehicle) for Lot M exiting traffic. Based on the small percentage of traffic generation and small percentage of parking spaces that Lot M comprises of the total, the inclusion of parking Lot M will not cause a significant impact to the total traffic flow surrounding the Martha Jefferson Hospital complex nor significantly impact traffic flow along State Farm Boulevard. In addition, based on the traffic analysis results above, traffic flow along State Farm Boulevard and traffic entering Lot M will have no delay while traffic exiting Lot M will have a delay of 10.2 seconds per vehicle corresponding to a LOS of B +. The threshold between LOS A and B is 10.0 seconds per vehicle. JO -WAY STOP CONTROL SUMMi-, General Information Site Information nalyst B. Revels Intersection Unsignalized gency /Co.RKK Engineers Jurisdiction Albemarle Co.. VA Date Performed 8/27/2009 Analysis Year 2011 nalysis Time Period PM Peak Project Description Martha Jefferson Hospital complex East/West Street: LOT M Entrance North /South Street: State Farm Boulevard Intersection Orientation: North -South Study Period (hrs): 0.25 ehicle Volumes and Adjustments Major Street Northbound Southbound Movement 1 2 3 4 5 6 L T R L T R olume 0 625 11 0 0 0 Peak -Hour Factor, PHF 1.00 1.00 1 00 1.00 1 00 1.00 Hourly Flow Rate, HFR 0 625 11 0 0 0 Percent Heavy Vehicles 0 0 Median Type Undivided RT Channelized 0 0 Lanes 0 2 0 0 0 0 Configuration T TR Upstream Signal 0 0 Minor Street Westbound Eastbound Movement 7 8 9 10 11 12 L T R L T R olume 0 0 39 0 0 0 Peak -Hour Factor. PHF 1.00 1.00 1.00 1.00 1.00 1 00 Hourly Flow Rate, HFR 0 0 39 0 0 0 Percent Heavy Vehicles 0 0 0 0 0 0 Percent Grade (5)0 0 Flared Approach N N Storage 0 0 RT Channelized 0 0 Lanes 0 0 1 0 0 0 onfiguration R Delay, Queue Length, and Level of Service Approach NB SB Westbound Eastbound Movement 1 4 7 8 9 10 11 12 Lane Configuration R v (vph)39 C(m)(vph)727 v/c 0.05 95% queue length 0.17 Control Delay 10.2 LOS B Approach Delay 10.2 Approach LOS B Rights Reserved 1l1•\'Nlh' \I 1 - 1 ".n0 , .'I,n; 1 m,rt,i,, ”1 ri tuI \II IL,tht, kc.rncd t.Nnl Id 41,1 e -' a f 'i"' t `7. r , . , i.wer , .t?f ' N .,^aaire"' A-1‘s 3:2,-!,.''',.::.;=,;,/T-e.' .-,--, ,- ,, r r 2 ' ,1, ''' ''; '' I"' .- t-4,k„,,,,:.$4,-14 ., ii,r 4 w3 x 7::' ::::r..;.! : j .:. ' ' ejeTej!sonHospita1 .r•::.„,i:,---_.,••..-:„.1.....-- ,, r . 4 ,.„,,„,„,,,,,,,,,,„,„,,,.,, ,, , .., . 0- xI,"41,44.. i S. s t'''', ,. M" 446.4,."4 x ,,,,,,n.'!1 . "an', `r r 414 It vM 144 .t4 04. x * „w * tY1 Parking Demand Study g...„„,,,,, rf....... • .,..:.,,,,,,, 4,.,.. , f 7!;= -E - E jai + yK b C mo r C'iw+9 h 6 s '3? d Martha Jefferson 4 Hospital f 3 i 44. Charlottesville, Virginia w r,. July zs, 2009 j'''' w r max, " GRaEF KahlerSlater Parking Demand Study for Martha Jefferson Hospital Charlottesville, Virginia Submitted: December 29, 2006 Updated: July 21, 2009 Prepared for: Kahler Slater Architects 111 W. Wisconsin Avenue Milwaukee, WI 53203 -2501 Phone: 414.290.3787 Contact: Allan Krueger Prepared by: GR EF One Honey Creek Corporate Center 125 South 84th Street, Suite 401 Milwaukee, WI 53214 -1470 Phone: 414.266.9141 Contact: Shana Mogensen, P.E. Introduction Martha Jefferson Hospital plans to replace its existing facility and develop a comprehensive health care campus on a 72.6 acre site located in the Peter Jefferson Place development. GRAEF was retained by Martha Jefferson Hospital to conduct a parking demand study for the future hospital campus. This report summarizes the parking occupancy of the existing hospital, hospital statistics, parking demand ratios and the future parking demand. This report also documents the assumptions, procedures and findings of the parking demand study. Existing Parking Occupancy The parking occupancy of the existing hospital campus is beneficial in establishing the existing parking demand. Parking occupancy counts were conducted at the existing hospital facility on February 15, 2006 between 8am and 4pm. The peak parking occupancy occurred between 10am and 2pm and therefore represents the typical design day conditions. Table 1 Summary of Parking Occupancy Campus Summary Parking Supply Occupied Spaces Occupied Visitor Spaces 237 209 88.2% Physician Spaces 65 67 103.1% Staff Spaces 407 410 100.7% Reserved Spaces 4 4 100.0% Handicap Accessible Spaces — Visitor 19 16 84.2% Handicap Accessible Spaces — Staff 3 1 33.3% Tenant Spaces 47 30 63.8% Total (Including Tenants)782 737 94.2% Total (Not Including Tenants)735 707 96.2% Note: Designated parking spaces for ambulances and hospital fleet vehicles are excluded. Occupancy greater than 100% can occur when vehicles are parked in unmarked spaces. The campus parking is over 96% occupied during the peak period. This occupancy level is assumed to accurately represent existing conditions and will be used to determine the existing parking demand. A parking system operates at optimum efficiency when occupancy is 85% to 90 %. Based on the occupancy counts, the existing facility is experiencing a shortage of physician and staff parking. Staff were observed parking on adjacent streets once their designated parking lots were filled. Approximately 50 vehicles with staff stickers were parked on adjacent streets. Students are not allowed to park in the staff or visitor parking lots. Therefore, the students tend to park on adjacent streets. The existing parking demand was adjusted to include the additional staff and student vehicles that could not be accommodated on the existing site. MIN GR EF 1 July 21, 2009L1Jobs20061200600011Projecl _Information \Reports \Parking Study\Parking Report 090721 doc Hospital Statistics Martha Jefferson Hospital staff completed a parking information survey, which included population and service statistics for the existing and future hospital facilities. A summary of the hospital statistics is shown in Table 2. Table 2 Existing & Future Hospital Statistics Existing (2006)Future (Year 2015) Total Beds 176 176 Physicians — Full time 35 37 Physicians — Part time 8 10 Other Regular Admitting Physicians 270 290 Employees — Full Time Equivalent (FTE)1,260 1,554 Contract Employees 41 45 Students 150 150 Residents 0 0 Volunteers - Daily 35 45 E/R Registrations — Daily 88 103 Outpatient Registrations — Daily 459 677 Inpatient Registrations — Daily 116 136 Education Programs /Conferences 30 50 Other Visitors 40 250 The statistics shown in Table 2 will be used to model existing parking demand and estimate the demand for the future hospital. The inpatient and emergency room registrations are estimated to increase by approximately 17% over the next nine years based on projected hospital patient statistics. Parking Demand for Future Hospital The parking demand ratios that model existing peak period demand for a typical design day are shown in Table 3. These demand ratios are based upon the statistics provided and the conditions observed at the existing hospital. The ratios may not portray the busiest parking day of the year at the hospital. GR EF 2 July 21, 2009L1Jobs20061200600011Protect _Information \Reports \Parking Study\Parking Report 090721 doc Table 3 Parking Demand Ratios Physicians 0.40 spaces per bed Employees (FTE)0.40 spaces per FTE Contract Employees 0.40 spaces per contract employee Students 0.40 spaces per student Volunteers 0.50 spaces per volunteer Visitors: EIR Patients 0.20 spaces per registration Outpatients 0.40 spaces per registration Inpatients 0.20 spaces per bed Education /Conferences 0.50 spaces per attendee Other Visitors 0.25 spaces per visitor As a comparison, published parking demand ratios can range from 0.75 spaces per bed to 7.63 spaces per bed resulting in parking demands of 132 spaces to 1,343 spaces, respectively for the future hospital. Whereas the parking demand ratios shown in Table 3 were developed for specific users at this site. Applying these demand ratios to the hospital statistics will determine the parking demand for the future hospital. It is important that the supply of parking spaces includes a cushion in excess of the actual demand. This cushion allows for vacancies created by restricting lots to designated users, misparked vehicles, minor construction, the dynamics of parking and unparking vehicles, and to reduce the time needed to search for the last few available spaces. If this cushion is not provided, there will likely be a perception of a parking shortage even though vacant spaces exist in the system. If an adequate cushion is provided, it will be easier to locate open spaces. if the cushion is too large, the most inconvenient spaces will be rarely filled. For these reasons, it is an accepted practice to factor the parking demand to plan for an optimum occupancy level of 85% to 90 %. The parking demand for each user is summarized in Table 4. An occupancy factor of 90% was applied to the parking demand of all users, with the exception of physicians in which an 85% occupancy factor was used. GR EF 3 July 21, 2009 L \ Jobs2006120060001 \Project_Informabon \ Reports \Parking Study Parking Report 090721 doc Table 4 Future Parking Demand Future (Year 2015) Occupancy % Number of Spaces Parking Demand Factor)Recommended Physicians 71 85% (1.177)84 Employees 640 90% (1.111)712 Students & Volunteers 83 90% (1.111)93 PatientsNisitors: ER 21 90% (1.111)24 Outpatients 271 90% (1.111)302 Inpatients 36 90% (1.111)40 Education /Conferences 25 90% (1.111)28 Other 63 90% (1.111)70 Total Parking Spaces 1,210 1,353 As shown in Table 4, a total of 1,353 parking spaces are recommended for the replacement hospital. Handicap Accessible Spaces The Virginia Construction Code references the International Building Code (IBC) for accessible parking requirements. The following requirements are based on Chapter 11 of the IBC. Ten percent of patient and visitor spaces provided to serve hospital outpatient facilities shall be accessible (IBC Section 1106.3). The number of parking spaces for all other uses was based on Table 1106.1 in the IBC. The minimum number of accessible spaces required by the IBC is shown in Table 5. Table 5 Accessible Spaces Per User Number of Minimum Number of Use Total Spaces Accessible Spaces PatientNisitor Spaces for 326 33OutpatientFacilities Other Uses 1,027 20 Total Parking Spaces 1,353 53 As shown in Table 5, a minimum of 53 spaces will be required to be accessible. The 53 accessible spaces account for approximately 4 percent of the total parking supply. In comparison, the existing hospital campus currently has 22 accessible spaces, which accounts for 3 percent of the total parking spaces. For every six accessible spaces, at least one shall be a van accessible space (IBC Section 1106.5). Therefore a minimum of 9 van accessible spaces will be required. GR EF 4 July 21, 2009 L. \Jobs2006120060001 \Project _Information \Reports \Parking Study Parking Report 090721 doc Conclusions The existing hospital campus has 735 parking spaces with an overall occupancy over 96 percent. Parking demand ratios were developed based on hospital statistics and the conditions observed at the existing hospital. Based on the parking demand study, the replacement hospital is recommended to provide 1,353 parking spaces, which includes 53 accessible parking spaces. It should be noted that the number of parking spaces is expected to only accommodate the parking needs of the replacement hospital. Future physician office buildings (POBs) and tenant space should be evaluated as they may increase the number of parking spaces required for the campus. GR EF 5 July 21, 2009 L 1Jobs20061200600011Project _Information \Reports \Parking Study\Parkmg Report 090721 doc