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HomeMy WebLinkAboutWPO201400041 Calculations 2014-05-06 FALZED AND ASSOCIATES INC it NW REFLECTING TOMORROW May 5, 2014 County of Albemarle Attn: Max Greene 401 McIntire Road Charlottesville, VA 22902 RE: Stormwater Management Computations Goodwill — Mill Creek Drive Albemarle County, Virginia Balzer Project# S1300029 This letter is to accompany the attached calculations and site plan `Goodwill — Mill Creek Drive'for the stormwater management engineering review. The 0.73 acre site was incorporated in the stormwater calculations previously performed by Roudabush, Gale & Associates, Inc titled `Southside Shopping Center Site Plan'. These attached calculations show a storm channel adequacy for the entire site with an 80% impervious cover. This is above the 77% impervious area currently proposed on the site plan. Additionally, it is our understanding based on the letters attached that this site is incorporated in the pond calculations on the high school property. Since we are under the assumed 80% impervious area build out, stormwater detention is not necessary at this time. Water quality will be met by the purchasing of credits for 1.21 lbs (See attached calculation). Sincerely, BALZER AND ASSOCIATES, INC. ik;1.--dZ, Kent O'Donohue, LA Project Manager N cv v IV\ Q" cA \t. 1\ d 10".MININI111111 )...f.11 (st lummill ,I ' ` inn 0 1111111 I' .w � w LI Immolipoori „ (.4\°''' 4111. 111111 1j kt C-1 t'i-i imIllE1111 IN 1111 111 a ,3 (11 0 -...., N. 1.. nisei 4.illi lz all 4:n mg 1 N —I nr0 ♦ Q 1IFE1,,_, ...... O 11111 cr- _ Iii ti . •„ ,........• 0 a ©ct 2 ami 1I : 0 c-- .� H W a x O �- B v' " In N �n I 1I1 W�.-- ia a b k, % D—Zo�� � ci as 00 L r = rr r�r�rrr■rrrr rrrmnnum ®Rrr - ., mart■ RU rr z _ r■■■ rrrrrrr r0 t Z !)ult:..3 I .r..,?\1_, .cl... (if . 7: N. ZNI ,..: .. , am.® v 1Ii1 .5) s• 1IL v CI _ill 7 Z , ,, ,1 . , g rz �' ENE cc° . 1111 a ALI i- i Kz & er. I W �- sa a d ko .- cA .pp II c. Q I � 0- 1111111 ... 15 � o + � ' ``1°� f Piss I u. a , C , ' IC'CP IJIN1U C.I.JV WILPLICA, „Ac-411146.0 IN 4.00=141.111 lirrAverF) MEMORANDUM TO: Bill Fritz - Senior Planner FROM: Glenn E. Brooks - Civil Engineer II GEZ DATE: 16 January 1996 RE: Site Review Comments Avon Street Planned Development Application Watershed Boundary - Rivanna River Watershed, Moores Creek Subwatershed, unnamed intermittent stream drainage basin Streams/Watercourses - The site drains to an intermittent stream on the adjacent high school property, which drains directly to the pond (lake) on the high school property adjacent to Lakeside Apartments. Wetlands- There are no jurisdictional wetlands on-site. Water Resources Ordinances - The Water Resources Protection Areas Ordinance does not apply. Albertiarle County Engineering will recommend preliminary approval when the following items have been satisfactorily ad(fressed, fEach item is preceded by the applicable reference, which is to the Zoning 01dinanec urile•cs otherwise speciied] 1. 18..5.J.di Only one elitr(nice will be pe)mitted on either side of the proposed road to the new high school for this cornitlercial development. These entrances must be aligned to reduce traffic conflicts. - 2, /,U Show trict t)roposed improvements, by the County for the Avon Street/Rotite 20 Connector Road, lahe site grading Int-1st plateh.vdth the proposed cc)nceptual plans and grade, for da, IORC,, Please contact jack 1(elsey for information ())) this i(-)ad project. 3, [8,5,„Lii provide d, concm,crituj drai• agn laYotit ft is our understaridinp that this areal is inel fir-meet% fit f r p t„. tt,ing ta '.or detention 41. 6.5, tz 6 1,1 A provisinit!4- 1'01 ft' .,41)(/ ci, ' S 4:14 111'()Itli parkinf, -4- -- - ' = - Department of Engineering& Public Works MEMORANDUM TO: Bill Fritz, Senior Planner FROM: Glenn E. Brooks, Senior Engineer DATE: 29 March 1999 RE: Creek Mill, final plat The final plat for Creek Mill (part of the Southside Shopping Center) received on 18 March 1999 has been reviewed. The Engineering Department will recommend approval of the final plat when the following conditions have been met. 1. Engineering Department approval of BMP computations and plans. (If this site is sharing in the use and maintenance of the lake on Monticello High School and Lakeside Apartment property, provide documentation for this, and verification of BMP capacity.) 2. Engineering Department receipt of a completed stoLaiwater facilities maintenance agreement and recording fee, if applicable. 3. Engineering and VDOT approval of road plans and drainage computations. 4. Fngineering Department receipt of copies of easements for off-site work. 5. Engineering Department approval of an amended erosion control plan. 6. Roads and utilities must be bonded or built in accordance with approved plans. Please contact me if you have questions or require additional information. Copy: SDP-98-053 ile: creekmilli.doe WATER QUALITY CALCULATION WORKSHI" Developed in accordance with Virginrmwoter Management Handbook. Enter data in highlighted cells. Others contain formula. PROJECT NAME: Goodwill-Mill Creek Drive PROJECT#: S1300029 DATE: May 5,2014 BY: DKO PRE-DEVELOPED PHOSPHOROUS LOADING: 0.0733 =Area of Site(acres) 0.0117 =Impervious Area(acres) 16.00 =Impervious Area(%) 0.4423 =Pre-Dev Phos.Load Factor(Ib/ac/yr)from Table 1 0.0324 =Pre-Dev Phos.Loading(Ib/yr) PRE ON-SITE POST-DEVELOPED PHOSPHOROUS LOADING: SubArea Area(ac) %Imperv. Fpost Lpost Site 0.733 77% 1.69 1.24 0.11 0.00 0.11 0.00 0.11 0.00 0.11 0.00 0.11 0.00 TOTAL= 1.24 lb/yr POST PHOSPHOROUS REMOVAL REQUIREMENT(RR): 1.24 =Post-Dev.Load(Ib/yr) 0.0324 =Pre-Dev.Load(Ib/yr) 0.0032 =10%of Pre-developed(Ib/yr) n =Redevelopment?(YIN) 1.21 =Removal Rate(Ib/yr) RR PHOSPHOROUS LOADING FOR ON-SITE BMP AREAS: SubArea Area(ac) %Imperv. Fpost Lpost Site 77% 1.69 0.00 O 0% 0.11 0.00 0 0% 0.11 0.00 0 0% 0.11 0.00 0 0% 0.11 0.00 0 0% 0.11 0.00 TOTAL= 0.00 lb/yr ON-SITE PHOSPHOROUS LOADING FOR OFF-SITE AREAS: SubArea Area(ac) %Imperv. Fpost Lpost Site 0.11 0.00 0 0.11 0.00 O 0.11 0.00 O 0.11 0.00 O 0.11 0.00 O 0.11 0.00 TOTAL= 0.00 lb/yr OFF-SITE SELECT BMP: SubArea Area(ac) Lpost %Imprv. BMP Eff(%) Lrp(lb/yr) Design Site 0.00 0.00 0% 0.00 0 0.00 0.00 0% 0.00 0 0.00 0.00 0% 0.00 0 0.00 0.00 0% 0.00 O 0.00 0.00 0% 0.00 O 0.00 0.00 0% 0.00 TOTAL= 0.00 Evaluation= Fail Page 1 of 1 Project Name: Goodwill - Mill Creek Dr WPO file number: WP0201400041 Erosion and Sediment Control Bond Estimate Item Item Number stal lization (PS, TS) all fence (SF) safety fence(SAF) diversion (DD, FD, RW D) temporary slope drain (TSD) pipe length earthwork for trap /basin 0 ft cut at high side height of dam at toe 0 ft height of fill at face 0 ft length of dam length of cut lap width 0 ft (area above transition) 0 ft (total width of dam) (area below transtion) (height below transition) 0 ft (area below transition) 0 ft (total fill volume) (depth below lransilior length of spillway 0 sf width of spillway structures for basin 0.0 cy (total ell volume) riser height 0 it riser diameter 0 cy barrel length (spillway stone tons) barrel diameter sit fence inlet protection (IP) stone inlet protection (IP) Oft outlet protection (OP) length channel (SCC, matted) length check dam depth in channel construction entrance (CE) 0 wash rack (barrel unit price) paved construction entrance rip-rap, placed depth width survey and layout (price par 0.1 mi.) acres mobilization 0 ft stream crossing (computed independently) 0 ft pipe diameter 0 in 0 ft cut at high side 0 ft 0 ft cut at face 0 ft 0 ft length of cut 0 ft 0 ft width of cut 0 ft 0 sf (area below transtion) 0 sf 0 ft (total width of cut) 0 ft O ft (depth below lransilior O ft 0 sf (area above transition) 0 sf 0.0 cy (total ell volume) 0.0 cy 0 it (TOAL CV estimate) 0 cy 0 it (spillway stone tons) 0 tons 0 Oft 0 in (ris unit price) $0.00 0 it base plate or fda 0 0 in (barrel unit price) 50.00 barrel collars 0 baffle length 0 ft 0 it width 0 ft 0 it width 0 ft 0 it channel width 0 ft 0 it length 0.0 ft 0.0 (tons) 0 tons 0 traps and basins 0 No. Unit Unit Cost Cost (installed) 0.6 acres $5,000.00 $4,000.00 200.0 ft $5.00 $1,000.00 0.0 ft $5.00 $0.00 120 ft $13.00 $1,560.00 $0.00 $0.00 I cost sum prcj mgmt contingency Total $13.00 $0.00 $50.00 $0.00 $0.00 $200.00 $0 $0.00 $200.00 $0 $50.00 $0 $100.00 $0.00 $200.00 $400.00 $0.00 $0.00 $0.00 $0.00 $0.00 $2,000.00 $2,000.00 $2,000.00 $2,000.00 $3,500.00 $0.00 $60.00 $0.00 $0.00 $500.00 $0.00 $11,460.00 $1,719.00 $1,317.90 $14,500 10/14/2014