HomeMy WebLinkAboutSDP200800073 Calculations 2007-06-01June 1. 2OH
N'Is. JO I lQuIs
Pr(iccl Do'clopmelt (,td. l.C,
104 Alm N1,n Blvd.,
V'incshoro, VA 22
Rc: 'I lirce Notch'd tinter •1`ramporlathn ,Analysis flan
car POs. i lianty ins
Attachcd plcasc find traffic irif`tn cttathm rcclucsteci rci,arcCitti; the proposcd 'Hirce
otch'd Center dewliImovi. The infi}rmatiun in(cIudcd resymuis U, the specific Alhermarle
llnntV (We: 25.6 A(khtiunal Regt ircmcnis.
SlIrcific ird"OFInaticin 1)1 inCudes:
i. Projected AUt01110hiIC "I r,IClir - ilIWCIIed C;ihleI inCudcs full site \ehiCe tril)
gcrneration, has-•d on IT F Trip (InetWon ( 'odes. We cstimatc that truck traflic
ShOUld he no more than 5"r, of this toml.
I:stil)Iated 11 dP trihutiOtrt See Figure 1.
3. Access 11061t turnip" m0Vcrncrtts sec Fig= 1.
1. Proposed mo\ cmusn , An additional \vesthomid Rotrtc 40 Line the site
parcel \t ill he developed. A sin le e IIWICC "ill be l)riiV idCd, allhuu ;h it (inure
shared usnmcc ai the eamum parcel edge (see Figure I ) could he
accomnimWed.
lease feel free to call us should YOU hay e arr fill thcr quest ions.
Sincerely,
DRAPER ADEN .ASS(.)C "1:1,'I•l ?S
r
I hlr7t<rs l:. 1'Ivnn, I',i.., P
I ran >;lu,rtatic,t Pri>rr,.>rn 1atiti`cr
Attachn
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Table 1
TRIP GENERATION
Estimated rates. Actual data unavailable.
I
AM PEAK AM PEAK AM PEAK PM PEAK PM PEAK PM PEAK
DAILY
ITE TRIP DAILY TRIP TRIP ENTE
LANDUSE CODE SgFt.RATE TRIPS RATE TRIPS ENTER EXIT ENTER EXIT RATE TRIPS R EXIT ENTER EXIT
Commercial retail
Gift Shop / Clothing 870 2025 66.
4 134 4.
8 10 54 46 5 4 4.
2 9 50 50 4 4
Sit Down restaurant 932 3600 127.
15 458 11.
52 41 52 48 22 20 10.
92 39 91 39 36 15
Pizza / Ice cream take out 933 2400 716 1718 43.
87 105 60 40 63 42 26.
15 63 51 49 32 31
Dry Cleaners (drop off only)820 1000 42.
94 43 1.
03 1 61 39 1 0 4 4 48 52 2 2
Video rental 896 1200 60'72 10`12 50'50'6 6 13.
6 16 46 54 8 9
General retail 814 1700 44.
32 75 2.
71 5 44 56 2 3 7 12 48 52 6 6
SUBTOTAL 2501 174 99 75 142 87 67
Commercial Office
General Office 710 5962 11.
01 66 1.
55 9 88 12 8 1 1.
49 9 17 83 2 7
Medical Office 720 5962 36.
13 215 2.
48 15 79 21 12 3 3.
72 22 27 73 6 16
SUBTOTAL 281 24 20 4 31 7 24
General Commercial Office 710 6525 11.
01 72 1.
55 10 88 12 9 1 1.
49 10 17 83 2 8
TOTALS 2854 208 127 81 183 96 99
Estimated rates. Actual data unavailable.
I
PROPOSED ROADWAY GE01v1ETRICS N
SITE
Future
Shared
Driveway
a State Rte 240
LEGEND
Existing Lane Usage
Proposed Lane Usage
SITE TRAFFIC DISTRIBUTION (% Total Traffic)
Site
70 % 30%
Rte 240 (West) Rte 240 (East)
SITE TRAFFIC AT FULL DEVELOPMENT
m v
oa o
Ln ry
38 (29) 428
89(67)F9 —
LEGEND
XX ()M AM peak (PM peak) Daily Trips
THREE NOTCH'D CENTER FIGU
Traffic Data
Short Version BMP Computations For Worksheets 2 - 6
Albemarle County Water Protection Ordinance: Modified Simple Method
Plan: Three Notch'd Center Water Resources Area: Rural Area
Preparers NP Date: 17- Mar -08
Project Drainage Area Designation DA1
L storm pollutant export in pounds, L = [P(Pj)Rv/ 12 ] [ C(A)2.72 ]
Rv mean runoff coefficient, Rv = 0.05 + 0.009(1)
Pj small storm correction factor, 0.9
1 percent imperviousness
P annual precipitation, 43" in Albemarle
A project area in acres in subject drainage area, A = 2.32
C pollutant concentration, mg /I or ppm target phosphorus
f factor applied to RR
V required treatment volume in cy, 0.5" over imperv. area = A(1)43560(0.5/12)/27
RR required removal . L(post) - f x L(pre)
RR removal efficiency, RR100 /L(post)
Impervious Cover Computation (values in feet & square feet)
Item
pre - development Area post - development Area
Roads Length Width subtotal Length Width subtotal
0 0 0 0 0 0
0 0 0 0 0 0
0 0 0 0
0 0 0 0
Driveways Length Width no. subtotal Length Width no. subtotal
and walks 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0
Parking Lots 1 2 3 4 1 2 3 4
27815.5 27815.5 58785.84 0 58785.84
Gravel areas Area Area
0 x0.70= 0 x0.70=0
Structures Area no. subtotal Area no subtotal
0 0 0 0 0 0
0 0 0 0 0 0
0 0 0 4818.63 0 15900
Actively - grazed pasture & Area Area
yards and cultivated turf 66707.3 x 0.08 = 5336.58 24401 4 x 0.08 =1952.112
Active crop land Area Area
x0.25= 0 x0.25=0
Other Impervious Areas
0 0
Impervious Cover 38%76%
l(pre)post)
Rv(post) V
0.73 118.3
New Development (For Development Areas, existing impervious cover <= 20 %)
C f I (pre) * Rv(pre) L(pre) L(post) RR % RR Area Type
0.70 1.00 20% 0.39 553 10.43 4.90 47%Development Area
0.35 1.00 0% 0.39 2.76 5.22 2.45 47%Drinking Water Watersheds
0.40 1.00 1% 0.39 3.16 5.96 2.80 47%Other Rural Land
min. values
Redevelopment (For Development Areas, existing impervious cover > 20 %)
C f I (pre) * Rv(pre) L(pre) L(post) RR % RR Area Type
0.70 0.90 20% 039 5.53 10.43 5.46 52%Development Area- -
0.35 0.85 0% 0.39 2.76 5.22 2.87 55%Drinking Water Watersheds
0.40 0.85 1% 0.39 316 5.96 3.28 55%Other Rural Land
Interim Manual, Page 70 rev. 16 Feb 1998 GEB
Short Version BMP Computations For Worksheets 2 - 6
Albemarle County Neater Protection Ordinance: Modified Simple Method
Plan: Three Notch'd Center Water Resources .Area: Rural Area
Preparer NP Date: 17- Mar -08
Project Drainage Area Designation DA1
L storm pollutant export in pounds. L = [P(P1)Rv /12 J [ C(A)2 72 1
Rv mean runoff coefficient, Rv = 0.05 + 0 009(1)
Pj small storm correction factor, 0 9
1 percent imperviousness
P annual precipitation 43" in Albemarle
A project area in acres in subject drainage area, A = 232
C pollutant concentration, mg /l or ppm target phosphorus
If factor applied to RR
V required treatment volume in cy, 0 5" over unpery area = A(1)43560(0 5/12)127
RR required removal , L(post) - IF x L(pre)
RR removal efficiency, RR100 /L(post)
Impervious Cover Computation (values in feet & square feet)
Item
pre - development Area post - development Area
Roads Length Width subtotal Length Width subtotal
0 0 0 0 0 0
0 0 0 0 0 0
0 0 0 0
U 0 0 0
Driveways Length Width no. subtotal Length Width no subtotal
and walks 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0
Parking Lots 1 2 3 4 1 2 3 4
27815.5 278155 5878584 00 X8785 84
Gravel areas Area Area
0 x0 70= 0 x0.70=0
Structures Area no subtotal Area no subtotal
0 0 0 0 0 0
0 0 0 0 0 0
0 0 0 481863 0 15900
Actively- grazed pasture & Area Area
yards and cultivated turf 667073 x 0 08 = 5336 58 24401 4 x 0 08 =1952 112
Active crop land Area Area
x025 = 0 x025-0
Other lrnpervious Areas
n 0
Impervious Cover 38 , U 76';4,
pre)post)Rv(post) V
073 1183
New Development (For Development Areas, existing impervious cover <- 20 %)
C f I (pre) * Rv(pre) L(pre) L(post) RR % RR Area 1
0.70 1 00 20% 039 553 I 0 43 4 90 47% Development Area
0.35 1 00 0% 039 2 76 5.22 245 47% Drinking Water Watersheds
040 1 00 1 °,'0 039 3 16 5 96 280 47% Other Rural Land
min values
Redevelopment (For Development Areas, existing impervious cover > 20 %)
C If I (pre) * Rv(pre) L(pre) L(post) RR % RR area Type
0.70 0.90 20% 039 553 1043 546 52% Development Area
0.35 025 013/0 039 2 76 5.22 281 S5° Drinking Water Watersheds
0.40 0.85 1 110 039 16 96 3x_3 55 "5 {,tt'•.r Rt rai La?1.1