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Home My WebLink AboutRe: drainage y-2&- 24frz Bonestroo,Rosene,Anderlik and Associates,Inc.is an Affirmative Action/Equal Opportunity Employer Bonestroo and Employee Owned Principals:Otto G.Bonestroo,P.E.• Marvin L.Sorvala,P.E.•Glenn R.Cook,P.E.•Robert G.Schunicht,P.E. Rosene Jerry A.Bourdon,PE.• Mark A.Hanson,P.E. Anderlik & Senior Consultants:Robert W.Rosene,PE.• Joseph C.Anderlik,P.E.•Richard E.Turner,P.E.•Susan M.Eberlin,C.P.A. Ac Associate Principals:Keith A.Gordon,PE.• Robert R.Pfefferle,P.E.•Richard W.Foster,PE.• David O.Loskota,PE. ssociates Michael T.Rautmann,P.E.• Ted K.Field,P.E.• Kenneth P.Anderson,P.E.•Mark R.Rolfs,P.E.• David A.Bonestroo,M.B.A. Sidney P.Williamson,P.E.,L.S.• Agnes M.Ring,M.B.A.•Allan Rick Schmidt,P.E.• Thomas W.Peterson,PE. Engineers&Architects James R.Maland,P.E.• Miles B.Jensen,P.E.• L.Phillip Gravel III,P.E.• Daniel J.Edgerton,P.E.• Ismael Martinez,P.E.- Thomas A.Syfko,P.E.• Sheldon J.Johnson• Dale A.Grove,P.E.• Thomas A.Roushar,P.E.• Robert J.Devery,P.E. July 29, 2003 Offices:St.Paul,St.Cloud,Rochester and Willmar,MN• Milwaukee,WI• Chicago,IL Website:www.bones[roo.com Mike Gaffron Planning Director �� J Un City of Orono Post Office Box 66 v�0%, Crystal Bay,MN 55323 NO Re: 680 Tonkawa Road Plat No. 03-2901 File No. 139-03-000 Dear Mike, We have reviewed the revised grading plan dated 6-19-03 for the proposed new home construction at 680 Tonkawa Road. We have the following comments in regards to engineering matters. • The sod swales north and south of the proposed home are shown at grades of 6%to 8%. We recommend that sod swales not exceed 5%because of erosion concerns.The applicant should modify the Swale design to minimize erosion potential. • Retaining walls exceeding 4-feet in height require a separate engineered design submittal for review and approval. Wall elevations were not provided so it is unclear whether any walls heights exceed 4-feet. • The applicant has stated that drainage calculations were submitted for the neighboring property at 684 Tonkawa approximately 1 1/z years ago.That may be true however they are not specific to this application. Separate drainage information should be submitted that is specific to this site. That information should include existing and proposed drainage area maps and drainage calculations for the one, ten and one hundred year storm events.The drainage area maps should show the total drainage areas(on and off site) affecting all areas of the property.Flows through swales on the north and south sides of the proposed home should be quantified. Pre new home rates should not exceed post new home rates. • The erosion and sediment control measures should be in place,inspected and approved by the city prior to any grading or construction activities. Please contact me at(651) 604-4863 if you have any questions regarding this matter. Yours very truly, BONESTROO, ROSENE, ANDERLIK & ASSOCIATES, INC. Tom Kellogg Cc: Greg Gappa, City of Orono 2335 West Highway 36 ■ St. Paul, MN 55113 ■ 651-636-4600 ■ Fax: 651-636-1311 (ED) LL) V) 10 CV 0 LLI Ld C� / \ \ f o \ 00 to CO LLJ zw �-(n V) 57<C)=) o (t) 0 CL W o�: Q:�CK CL 0 �9 O =X O _ m Z Tater pfvF,ttt COAvO1TsOA/f (.o o, FAT.SI .lwoC EJ , i WOOD FENCE S ROCK/PLASTIC vision / 31.8 �30000a00` ROCK/PLASTIC 00 23.4 4.6 U EXIS NG HO N !�m �. a � S 11.5 BRICK N co 19.9 N ` 4' cr -P ' m 4 J ° nyo�E !r ROCK/ ?LAS.TIC - 24.2 + xFLA ST *Cbo VEL / GRAVEL DRIVEWAY / % f r r J Ab )p• t r r r r ........................................................ / ................................... r sion / r r N 61008'00 E 340.71 / SES iy , r 1 \ O ^ 940�- z V) 0 950 960 00x —n Go l co CD OOV LO v O� O / / o x Q: / O / I Q 0 O N i/ 0 co a) ol � / Quick TR-55 Ver.5 .47 SIN: Executed: 16 : 05 :42 08-07-2003 Thomas Deveau Area 2 (North Swale) Before Conditions RUNOFF CURVE NUMBER DATA Composite Area: AREA CN SURFACE DESCRIPTION (acres) -------------------------------- --------- ---- Existing House 0 . 02 98 Landscape/Rock 0 . 02 85 Open space, B soils 0 . 04 61 COMPOSITE AREA ---> 0 . 07 76 .7 ( 77 ) Quick TR-55 Ver.5 .47 SIN: Executed: 16 : 07 : 03 08-07-2003 Thomas Deveau Area 2 ( North Swale) After Conditions RUNOFF CURVE NUMBER DATA Composite Area: AREA CN SURFACE DESCRIPTION (acres) -------------------------------- --------- ---- House 0 . 03 98 Open Space, B soils 0 . 07 61 COMPOSITE AREA ---> 0 . 09 71 .3 ( 71 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Quick TR-55 Ver.5 .47 SIN: Executed: 15 :51 :21 08-07-2003 Thomas Deveau Area 2 (North Swale) Before & After Conditions Tc or Tt DATA Subarea: LENGTH VELOCITY TIME DESCRIPTION (feet) (ft/sec) minutes hours 130 0 .22 10 . 0 = 0 .17 minutes hours TOTAL Tc ---> 10 . 0 = 0 .17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Quick TR-55 Version: 5 .47 SIN: Page 1 Return Frequency: 1 years TR-55 TABULAR HYDROGRAPH METHOD Type II . Distribution (24 hr. Duration Storm) Executed: 08-07-2003 16 :16 :34 Watershed file: --> TD2B MOP Hydrograph file: --> TD2BI .HYD Thomas Deveau Area 2 (North Swale) . Before Conditions >>>> Input Parameters Used to Compute Hydrograph << ------------------------------------------------------------------------------- Subarea AREA CN Tc * Tt Precip. Runoff Ia/p Description (acres) (hrs) (hrs) (in) (in) input/used 0 . 07 77 . 0 0 . 20 0 . 00 2 .35 0 .65 I.25 .25 ------------------------------------------------------------------------------- * Travel time from subarea outfall to composite watershed outfall point . I -- Subarea where user specified interpolation between Ia/p tables . Total area = 0 . 07 acres or 0 . 00011 sq.mi Peak discharge = 0 cfs >>>> Computer Modifications of Input Parameters <<<<< ------------------------------------------------------------------------------- Input Values Rounded Values Ia/p Subarea Tc * Tt Tc * Tt Interpolated Ia/p Description (hr) (hr) (hr) (hr) (Yes/No) Messages --------------------------------------------------------------------------- 0 .17 0 . 00 0 . 20 0 . 00 Yes Computed Ia/p < . 1 ------------------------------------------------------------------------------- * Travel time from subarea outfall to composite watershed outfall point . Quick TR-55 Version: 5 .47 SIN: Page 1 Return Frequency: 10 years TR-55 TABULAR HYDROGRAPH METHOD Type II . Distribution (24 hr. Duration Storm) Executed: 08-07-2003 16 :16 :34 Watershed file: --> TD2B MOP Hydrograph file: --> TD2B10 .HYD Thomas Deveau Area 2 (North Swale)- Before Conditions >>>> Input Parameters Used to Compute Hydrograph <<<< ------------------------------------------------------------------------------- Subarea AREA CN Tc Tt Precip. I Runoff Ia/p Description (acres) (hrs) (hrs) (in) (in) input/used ------------------------------------------------------------------------------- 0 . 07 77 . 0 0 . 20 0 . 00 4 . 15 1 1 . 93 I .14 .14 * Travel time from subarea outfall to composite watershed outfall point . I -- Subarea where user specified interpolation between Ia/p tables. Total area = 0 . 07 acres or 0 . 00011 sq.mi Peak discharge = 0 cfs >>>> Computer Modifications of Input Parameters <<<<< ------------------------------------------------------------------------------- Input Values Rounded values Ia/p Subarea Tc * Tt Tc * Tt Interpolated Ia/p Description (hr) (hr) (hr) (hr) `(Yes/No) Messages ------------------------------------------------------------------------------- 0 .17 0 . 00 0 . 20 0 . 00 Yes -- -------------------------------------------------------------------------------- * Travel time from subarea outfall to composite watershed outfall point . Quick TR-55 Version: 5 .47 SIN: Page 1 Return Frequency: 100 years TR-55 TABULAR HYDROGRAPH METHOD Type II . Distribution (24 hr. Duration Storm) Executed: 08-07-2003 16 :16 :34 Watershed file: --> TD2B MOP Hydrograph file: --> TD2B100 .HYD Thomas Deveau Area 2 (North Swale) Before Conditions >>>> Input Parameters Used to Compute Hydrograph <<<< ------------------------------------------------------------------------------- Subarea AREA CN Tc * Tt Precip. I Runoff Ia/p Description (acres) (hrs) (hrs) (in) (in) input/used ------------------------------------------------------------------------------- 0 . 07 77 . 0 0 . 20 0 . 00 5 . 95 1 3 .44 I.1 .10 ------------------------------------------------------------------------------- * Travel time from subarea outfall to composite watershed outfall point. I -- Subarea where user specified interpolation between Ia/p tables. Total area = 0 . 07 acres or 0 . 00011 sq.mi Peak discharge = 0 cfs >>>> Computer Modifications of Input Parameters ««< ------------------------------------------------------------------------------- Input Values Rounded Values Ia/p Subarea Tc * Tt Tc * Tt In"erpolated Ia/p Description (hr) (hr) (hr) (hr) (Yes/No) Messages ------------------------------------------------------------------------------- 0 .17 0 . 00 0 . 20 0 . 00 No Computed Ia/p <_ .l_ * Travel time from subarea outfall to composite watershed outfall point . Quick TR-55 Version: 5 .47 SIN: Page 1 Return Frequency: 1 years TR-55 TABULAR HYDROGRAPH METHOD Type II . Distribution (24 hr. Duration Storm) Executed: 08-07-2003 16 :24 :20 Watershed file: --> TD2A MOP Hydrograph file: --> TD2AI .HYD Thomas Deveau Area 2 (North Swale) After Conditions >>>> Input Parameters Used to Compute Hydrograph <<<< ------------------------------------------------------------------------------- Subarea AREA CN Tc * Tt Precip. Runoff Ia/p Description (acres) (hrs) (hrs) (in) I (in) input/used ------------------------------------------------------------------------------- 0 . 09 71 . 0 0 . 20 0 . 00 2 .35 ( 0 .42 I.35 .35 ------------------------------------------------------------------------------- * Travel time from subarea outfall to composite watershed outfall point. I -- Subarea where user specified interpolation between Ia/p tables . Total area = 0 . 09 acres or 0 . 00014 sq.mi Peak discharge = 0 cfs >>>> Computer Modifications of Input Parameters <<<<< ------------------------------------------------------------------------------- Input Values Rounded Values Ia/p Subarea Tc * Tt Tc * Tt Interpolated Ia/p Description (hr) (hr) (hr) (hr) (Yes/No) Messages ------------------------------------------------------------------------------- 0 . 17 0 . 00 0 . 20 0 . 00 Yes -- ------------------------------------------------------------------------------- * Travel time from subarea outfall to composite watershed outfall point . II Quick TR-55 Version: 5 .47 SIN: Page 1 Return Frequency: 10 years TR-55 TABULAR HYDROGRAPH METHOD Type II . Distribution (24 hr. Duration Storm) I Executed: 08-07-2003 16 :24 :20 I watershed file: --> TD2A MOP Hydrograph file: --> TD2A10 .HYD Thomas Deveau Area 2 (North Swale) After Conditions I I ------------->>>> Input Parameters Used to Compute Hydrograph <<<< -------------------------------------------------------------� Subarea AREA CN Tc * Tt Precip. I Runoff Ia/p Description (acres) (hrs) (hrs) (in) (in) input/use 0 . 09 71. 0 0 .20 0 . 00 4 . 15 1.50 I.2___ .2 *Travel time from subarea outfall to composite watershed outfall point . I -- Subarea where user specified interpolation between Ia/p tables. I Total area = 0 . 09 acres or 0 . 00014 sq.mi i Peak discharge = 0 cfs I >>>> Computer Modifications of Input Parameters <<<<< II ------------------------------------------------------------------------------- Input Values Rounded Values Ia/p Subarea Tc * Tt Tc * Tt Interpolated Ia/p Description (hr) (hr) (hr) (hr) (Yes/No) Messages ----------------------------------------------------------------------------�-- 0 . 00 0 .20 -----------------0- 17---------------------0Yes ---------- --------------------�--- * Travel time from subarea outfall to composite watershed outfall point . I I Quick TR-55 Version: 5 .47 SIN: Page 1 Return Frequency: 100 years TR-55 TABULAR HYDROGRAPH METHOD Type II . Distribution (24 hr. Duration Storm) Executed: 08-07-2003 16 :24 :20 Watershed file: --> TD2A MOP Hydrograph file: --> TD2A100 .HYD Thomas Deveau ' Area 2 (North Swale) After Conditions >>>> Input Parameters Used to Compute Hydrograph <<<< ------------------------------------------------------------------------------- Subarea AREA CN Tc * Tt Precip. I Runoff Ia/p Description (acres) (hrs) (hrs; (in) (in) input/used ------------------------------------------------------------- --------------- 0 . 09 71 . 0 0 . 20 0 . 00 5 . 95 1 2 .86 I. 14 .14 ------------------------------------------------------------------------------- * Travel time from subarea outfall to composite watershed outfall point . I -- Subarea where user specified interpolation between Ia/p tables. Total area = 0 . 09 acres or 0 . 00014 sq.mi Peak discharge = 0 cfs >>>> Computer Modifications of Input Parameters <<«< -------------------------------------------------------- - -------------- Input Values Rounded values Ia/p Subarea Tc * Tt Tc * Tt Interpolated Ia/p Description (hr) (hr) (hr) (hr) (Yes/No) Messages ------------------------------------------------------------------------------- 0 . 17 0 . 00 0 .20 0 . 00 Yes -- -------------------------------- * Travel time from subarea outfall to composite watershed outfall point . G � 4 -7-DN t4t-jtt GRONBERG&ASSOC AM INC. 445 N WILLOW Det. LONG LAKE,MN 55356 .BEfetf _ Covo.irro.✓1 _.�If_1_'f_�(_..C.o�!!l._T�o�J_ -i -XAF-4 -1.57t Ae. T/.OFOF COC C /Z_Miv. T/kfOF_CO,R.0 XjeAAoFF CCN" 73 12 c ICY ors _ Q � S.t N4 F /!' �/Oc✓ pwEATSD �J 4.ONG TNF T/✓.1.v � 4l Al vi.vG of I-OAIC THE �V E�GtiBo t..�G .��f.f c 6C_ ro 7-ey67 Aral-r✓1.-- ---- A�fA 2 �.va�cTy Sw.o�E� A4EFocE Coal0�7io.yJ .__ 7,tFL��_ CoyOly'io.�,S -_.--_-- .----.__-. AIL 6A = O. 07 t ,4 C. ofAF4 O. O g f AC. 7"1 w6 OF(',A&._ /D Mi•✓. r,/4e®F<.04.c;= /O AOAv. 141A OFF CCN = 7 7 /�G1,c/OFF ('iV•�= 7� (�iaa O C'f f THE Exi!'r�.c�� /✓.rococo✓ER ,yirJ D6rR6asE0 / TNF /�''N6J' QF_.tu�o.�.� Nil--- QF CA6d 1�1I 44/7TN$ Apt E.( /J 10 l/�f.t cC TN'! �t c4vOFF C4Z CN C-4 er 04?r it 7 D . Quick TR-55 Ver.5 .47 SIN: Executed: 15 :55 : 09 08-07-2003 Thomas Deveau Area 1 (South Swale) Before Conditions RUNOFF CURVE NUMBER DATA Composite Area: AREA CN SURFACE DESCRIPTION (acres) Existing Bldgs. 0 .14 98 Existing Road 0 . 08 98 Existing Gravel Drive, B soils 0 . 07 85 Existing Drives 0 .16 98 Existing patios,walks, etc . 0 . 08 98 Open space, B soils 1 . 04 61 COMPOSITE AREA ---> 1 .57 72 . 9 ( 73 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Quick TR-55 Ver.5 .47 SIN: Executed: 16 : 03 :19 08-07-2003 Thomas Deveau Area 1 (South Swale) After Conditions RUNOFF CURVE NUMBER DATA Composite Area: AREA CN SURFACE DESCRIPTION (acres) Buildings 0 . 15 98 Driveways 0 .23 98 Patios, walks, etc. 0 . 07 98 Open space, B soils 1 .10 61 COMPOSITE AREA ---> 1.55 71 .7 ( 72 ) Quick TR-55 Ver.5 .47 SIN: Executed: 15 :48 :47 08-07-2003 Thomas Deveau Area 1 (South Swale) Before & After Conditions Tc or Tt DATA Subarea: LENGTH VELOCITY TIME DESCRIPTION (feet) (ft/sec) minutes hours ---------- -------- --- ----- 450 0 .63 12 . 0 = 0 .20 minutes hours TOTAL Tc -> 12 . 0 = 0 .20 Quick TR-55 Version: 5 .47 SIN: Page 1 Return Frequency: 1 years TR-55 TABULAR HYDROGRAPH METHOD Type II . Distribution (24 hr. Duration Storm) Executed: 08-07-2003 16 :10 :48 Watershed file: --> TD1B MOP Hydrograph file: --> TD1BI .HYD Thomas Deveau Area 1 (South _Swale) Before Condit---'ns >>>> Input Parameters Used to Compute Hydrograph <<<< ' Subarea AREA CN Tc * TtPrecip. I Runoff Ia/p Description (acres) (hrs) (hrs) (in) (in) input/used 1.57 73 . 0 0 .20 0 . 00 2 .35 1 0.49 I.31 .31 ------------------------------------------------------------------------------- * Travel time from subarea outfall to composite watershed outfall point. I -- Subarea where user specified interpolation between Ia/p tables. Total area = 1 . 57 acres or 0 . 00245 sq.mi Peak discharge = 1 cfs >>>> Computer Modifications of Input Parameters <<<<< -------------------------------------------------------------------------------- Input Values Rounded Values Ia/p Subarea Tc * Tt Tc * Tt Interpolated Ia/p Description (hr) (hr) (hr) (hr) (Yes/No) Messages 0 .20 0 . 00 ** ** Yes -- ---------------------------------------------------------------------- * Travel time from subarea outfall to composite watershed outfall point. ** Tc & Tt are available in the hydrograph tables . Quick TR-55 Version: 5 .47 SIN: Page 1 Return Frequency: 10 years TR-55 TABULAR HYDROGRAPH METHOD Type II . Distribution (24 hr. Duration Storm) Executed: 08-07-2003 16 :10 :48 watershed file: --> TD1B MOP Hydrograph file: --> TD1B10 .HYD Thomas Deveau Area 1 (South Swale) Before Conditins >>>> Input Parameters Used to Compute Hydrograph <<<< -------------------------------------------*----------------------------------- Subarea AREA CN Tc Tt Precip. I Runoff Ia/p Description (acres) (hrs) (hrs) (in) (in) input/used ------ ----------- --- ------- -- 1 .57 73 . 0 0 . 20 0 . 00 4 . 15 1 1. 64 I.18 .18 ----------------------------------------------------------------------- * Travel time from subarea outfall to composite watershed outfall point . I -- Subarea where user specified interpolation between Ia/p tables . Total area = 1 .57 acres or 0 . 00245 sq.mi Peak discharge = 3 cfs >>>> Computer Modifications of Input Parameters <<<<< ------------------------------------------------------------------------------- Input Values Rounded Values Ia/p Subarea Tc * Tt Tc * Tt Interpolated Ia/p Description (hr) (hr) (hr) (hr) (Yes/No) Messages 0 . -----------------O-20----OYes ---------**------**-------- ----------------------- * Travel time from subarea outfall to composite watershed outfall point . ** Tc & Tt are available in the hydrograph tables . Quick TR-55 Version: 5 .47 SIN: Page 1 Return Frequency: 100 years TR-55 TABULAR HYDROGRAPH METHOD Type II . Distribution (24 hr. Duration Storm) Executed: 08-07-2003 16 :10 :48 Watershed file: --> TD1B MOP Hydrograph file: --> TD1B100 .HYD Thomas Deveau Area 1 (South Swale) Before Conditins >>>> Input Parameters Used to Compute Hydrograph <<<< ------------------------------------------------------------------------------- Subarea AREA CN Tc * Tt Precip. Runoff Ia/p acres Description p (acres) (hr s) (hrs) (in) I (in) input/used ------------------------------------------------------------------------------- 1 .57 73 . 0 0 . 20 0 . 00 5 . 95 1 3 . 05 I.12 .12 ------------------------------------------------------------------------------- * Travel time from subarea outfall to composite watershed outfall point . I -- Subarea where user specified interpolation between Ia/p tables . Total area = 1 .57 acres or 0 . 00245 sq.mi Peak discharge = 6 cfs >>>> Computer Modifications of Input Parameters <<<<< ------------------------------------------------------------------------------- Input Values Rounded Values Ia/p Subarea Tc * Tt Tc * Tt Interpolated Ia/p Description (hr) (hr) (hr) (hr) (Yes/No) Messages -----------------0_20Yes - 0 . 00 ** **-------- - -- * Travel time from subarea outfall to composite watershed outfall point . ** Tc & Tt are available in the hydrograph tables . Quick TR-55 Version: 5 .47 SIN: Page 1 Return Frequency: 1 years TR-55 TABULAR HYDROGRAPH METHOD Type II . Distribution (24 hr. Duration Storm) Executed: 08-07-2003 16 :13 : 02 watershed file: --> TD1A MOP Hydrograph file: --> TD1AI .HYD Thomas Deveau Area 1 (South Swale) After Conditions >>>> Input Parameters Used to Compute Hydrograph <<<< --------------------------- Subarea AREA CN Tc * Tt Precip. Runoff Ia/p Description (acres) (hrs) (hrs) (in) I (in) input/used ------------------------------------------------------------------------------- 0 . 00 --------------------1-55---- --0----0-20--------------35---I-----45--I------.33 33- * Travel time from subarea outfall to composite watershed outfall point. I -- Subarea where user specified interpolation between Ia/p tables. Total area = 1 . 55 acres or 0 . 00242 sq.mi Peak discharge = 1 cfs >>>> Computer Modifications of Input Parameters <<<<< ---------------------------------------------- --------------------------------- Input Values Rounded Values Ia/p Subarea Tc * Tt Tc * Tt Interpolated Ia/p Description (hr) (hr) (hr) (hr) (Yes/No) Messages ------------------------------------------------------------------------------- 0.20 0. 00 ** ** Yes -- ----------------------------------------------------------------------- * Travel time from subarea outfall to composite watershed outfall point. ** Tc & Tt are available in the hydrograph tables . Quick TR-55 Version: 5 .47 SIN: Page 1 Return Frequency: 10 years TR-55 TABULAR HYDROGRAPH METHOD Type II . Distribution (24 hr. Duration Stoni ) Executed: 08-07-2003 16 : 13 : 02 Watershed file: --> TD1A MOP Hydrograph file: --> TD1A10 .HYD Thomas Deveau Area 1 (South Swale) After Conditions.. >>>> Input Parameters Used to Compute Hydrograph «« Subarea AREA CN Tc * Tt Precip. Runoff Ia/p Description (acres) (hrs) (hrs) (in) I (in) input/used 1.55 72 . 0 0 .20 0 . 00 4 .15 1.57 I.19 .19 * Travel time from subarea outfall to composite watershed outfall point. I -- Subarea where user specified interpolation between Ia/p tables. Total area = 1.55 acres or 0 . 00242 sq.mi Peak discharge = 3 cfs >>>> Computer Modifications of Input Parameters <<<<< ------------------------------------------------------------------------------- Input Values Rounded Values Ia/p Subarea Tc * Tt Tc * Tt Interpolated Ia/p Description (hr) (hr) (hr) (hr) (Yes/No) Messages -------------------------------------------------------------------------------- 0.20 0 . 00 ** ** Yes -- * Travel time from subarea outfall to composite watershed outfall point . ** Tc & Tt are available in the hydrograph tables. Quick TR-55 Version: 5 .47 SIN: Page 1 Return Frequency: 100 years TR-55 TABULAR HYDROGRAPH METHOD Type II . Distribution (24 hr. Duration Storm) Executed: 08-07-2003 16 :13 : 02 Watershed file: --> TD1A MOP Hydrograph file: --> TD1A100 .HYD Thomas Deveau Area 1 (South Swale) After Conditions >>>> Input Parameters Used to Compute Hydrograph <<<< Subarea AREA CN Tc * Tt Precip. Runoff Ia/p Description (acres) (hrs) (hrs) (in) I (in) input/used ------------------------------------------------------------- --------------- 1 .55 72 . 0 0 .20 0 . 00 5 . 95 1 2 . 95 I.13 .13 -------------------------------------------------------------------- * Travel time from subarea outfall to composite watershed outfall point. I -- Subarea where user specified interpolation between Ia/p tables. Total area = 1 .55 acres or 0 . 00242 sq.mi Peak discharge = 6 cfs >> Computer Modifications of Input Parameters <<<<< ------------------------------------------------------------------------------- Input Values Rounded values Ia/p Subarea Tc * Tt Tc * Tt Interpolated Ia/p Description (hr) (hr) (hr) (hr) (Yes/No) Messages ------------------------------------------------------------------------------- 0 .20 0 . 00 ** ** Yes -- ------------------------------------------------------------------------------- * Travel time from subarea outfall to composite watershed outfall point. ** Tc & Tt are available in the hydrograph tables . Thomas J. DeVeau 680 Tonkawa Road Long Lake,MN 55356 952.471.7959 September 29,2003 Mr. Lyle Oman City of Orono 2750 Kelley Parkway P.O. Box 66 Crystal Bay,MN 55323 Re: 680 Tonkawa Road Dear Mr. Oman: Concerning our new home being built at 680 Tonkawa Road,we are distressed that you do not have the time or resources to meet at the site with Denali Custom Homes and myself to discuss the drainage plan. Although the drainage plan was approved by the city engineer and the inspection department,as we got to the point where the walls were poured and we began backfilling, it became clear to us that the drainage plan had some flaws that would be very expensive to correct at a later date. Creating a swale running down the length of the house on the north side will have the following unintended consequences: 1.) Nothing much grows on that side of the house as it is in near constant shade. A swale for runoff is an erosion problem down the road. 2.) The mature trees just on our side of the property line adjacent to the new house would be lost,creating root loss and significantly adding potential erosion problems. The root systems of the Leipold's adjacent trees would be damaged as well. 3.) Removing these trees will remove what little visual screen there is for the neighboring house. 4.) Installing approximately 100 feet of up to four feet tall retaining wall adds needless hardcover. 5.) The approved drainage plan expects us to handle all of the runoff and spring-fed water entering the property from the north, and directing it to the lake without letting it pass through to the next door property to the south as it has for 70+ years. It makes more sense to send this runoff down the north side of the house without even letting it get to the south side to potentially cause problems for 684 Tonkawa. 6.) The approved swale will allow much runoff from the property to the north next to our house to enter the swale. Adding this to the water coming off our roof running very close to our foundation could thereby create future problems for us. I have discussed this with Darel Leipold of 678 Tonkawa Road. He is in agreement with us that the existing plan will create the above problems. For the above reasons, it is imperative that your staff or yourself visit the site and discuss these issues so we can proceed with our construction. Thank you in advance for your attention to this matter. Sin Ir Meli Lee and T mas J. D eau 10/22/2003 14:14 9524762682 DENALI CUSTOM HOMES PAGE 01101 DENALI Custom Homes, Inc. 10-22-03 City Of Orono Inspections Dept. Attu: Lyle 952-249-4600 Dear Lyle; This letter is to inform you of Denali Custom Homes intent to adhere to the approved drainage plan for 680 Tonkawa Rd. After much discussion with the Home Owner, Tom Do Veau, and my Engineer we have concluded that we can work with the approved drainage plan and follow it as prescribed. We will be creating the swale to the west of the house and cumpleting the berm to the south to contain the run off water on the building site. As we have done since day one of our project,we will protect the neighbors property to the south with double silt fence and insure that once the berm is in place that out grading plan will eliminate water from the north intruding on their property. We request that you lift the stop work notice so that we may proceed with activities and imploment our original approved drainage plan. Please contact Denali at your earliest convenience so that we may proceed. Thank you for your patience in this matter and we look forward to your response. Sine , David Bieker-Denali .....,... . .. ,-., _ ., ,._ „ _r._.._L.._...-. *�r►r ccon� _nc1 A'1� r1�'7A.fn.. aS7 A'7rC_7�527 10/09/2003 08:38 9524762682 DENALI CUSTOM HOMES PAGE 02/02 DENALI Custom Homes, Inc. October 9,2003 Lyle Oman City of Orono 2750 Kelley Parkway Orono,MN 55356 RE: 680 Tonkawa Grace Period xoquest Dear Lyle Oman: Thomas DeVeau(property owner)and Denali Custom Homes,Inc(builder)request a lifting of the current oStop Work Order"for a period of two weeks(wtil Novoodicr 1,2003). Dining this period,Denali will obtain an engineering opinion and report regarding the storm water drainage system,for approval by the City of Orono inspections deparanent. Also,during this period,Denali wishes to continue the construction process in order to get as much accomplished as possible before winter arrives. Thank you for your consideration of this request. Si , David A.Bicker President I _. .. .. . . ..,--- -- IL Ar'►r cc,2A1 .nc7 A11r, 7A70 a fav QS7_d7F�_7FR7. FROM A3NBERG 8: ASSOCIATES FAX NO. : 952 473 4435 Nov. 21 2003 02:41PM P2 GRONBERG &ASSOCIATES, JNC. SURVEYING, ENGINEERING AND LAND PLANNING 445 N, WILLOW DRIVE LONG LAKE, MINNESOTA 55356 952-473-4141 FAx: 952-473-4435 r November 21, 2003 Thomas Deveau Proposed Culvert Summary The drainage calculations we did on August 7,2003 show that Area 1,the south swale, has a runoff of 1 CFS for the one year storm, 3 CFS for the ten year storm and 6 CFS for the 100 year storm. To handle the 3 CFS for a ten year design, the culvert should be a smooth walled pipe such as HDPE and have a slope of at least 0.6% for a 12 inch diameter pipe. We have shown a proposed 42 foot long 12 inch HDPE pipe at 2.0%. Riprap should be placed at the downstream end. Sincerely, Gr,onbergg&DAssociates Marr S. Gronberg, P.E. &L.S. 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