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Home My WebLink About20013040 428 North 2nd Street ALLES AND LaSalle, Colorado 80645 Telephone: 970-284-9562 Fax: 970-284-9564 ASSOCIATES, INC. March 12, 2001 Project No. KSIG 2001 Mr. Mike Sigg 2427 6th Avenue Greeley, Colorado 80631 Dear Mr. Sigg, Enclosed for your information is the preliminary report being sent to Weld County Public Works Department for their review. The location selected for the retainage pond is the one with the least amount of field construction required. Consideration was given to several smaller sites on each lot but the ditching on each lot to force the surface run-off into these small ponds; the question of maintaining the ponds and restrictions necessary to place on each lot owner led us to the conclusion to use one pond. The Weld County Public Works did throw us a curve not in the proposal. The pond having to hold the 100-year storm water and percolation tests in the site area to prove percolation of said quantity in 24 hours dictated two afternoon trips(4 hrs. each) to perform the two tests. Normally, it would be the 5-year storm level if sizing a culvert or ditch. We will hold to the quoted price until we complete all work that may be requested by the review agencies and evaluate at the completion if the work required exceeded our estimate. Sincerely, George D. Paulsberg Colorado P.E. # 3635,9 Enclosures: Preliminary Drainage Study& Print of Subd. EXHIBIT 2001-3040 1 25 ALLES AND 428 North 2n° Street LaSalle, Colorado 80645 Telephone: 970-284-9562 Fax: 970-284-9564 ASSOCIATES, INC. March 12, 2001 Weld County Public Works Weld County Engineering Department 1111 H Street P.O. Box 758 Greeley, Colorado 80632 Attention: Ms. Diane Houghtaling Reference: Lathem View Estates PLJD Subject: Peliminary Drainage Study of the Subdivision Dear Ms. Houghtaling, Enclosed is a drainage study of the above referenced subdivision with support documents. The guiding reference for this study has been Chapter 2 of the Field Engineering Manual "Estimating Run-off'published by the Soil Conservation Service of the United States Department of Agriculture. Rainfall intensity curves were also from SCS. The soil classifications found on site matched those in the soil survey of the area performed by SCS. The soil types were Olney and Vona both having good permeability ratings. Additionally, two percolation tests were performed by myself in the area of the retainage pond. The slower percolation rate was used in the calculations as a conservative approach to sizing the pond. Please call if any questions or any items 1 can clarify over the phone to save time in reviewing the study. Sincerely, // George D. Paulsberg l�j, Colorado P.E. # 35359 Enclosures: Preliminary Drainage Study & Print of Subd. March 12,2001 Project No. KSIG 2001 DRAINAGE STUDY (Preliminary) Objective Evaluate and calculate the quantity of rainfall run-off that will occur on the project property and provide for the containment of subject run-off that meets or exceeds the requirements of the Weld County Subdivision Ordinance No. 173-E and Planned Unit Development Ordinance No. 197. Location: Property is in the W %s SW 1/4 Section 10, Township 4 N., Range 65 W., 6 Principal Meridian, Weld County,Colorado. Project Name: Latham View Estates PUD-Dave Keiser& Mike Sigg, owners Reference A). Soil Survey of Weld County, Colorado- Southern Part by United States Department of Agriculture, Soil Conservation Service. B). Soil Conservation Service Engineering Field Manual, Chapter 2.- Estimating run-off. Site Conditions: A farm field of 45 acres being converted into a P.U.D. containing four lots for residential homes. The land currently has hay stubble covering the land. All irrigation facilities have been removed from the site. The land has a gentle slope to the NE where current run-off exits the land into the ditch of WCR 46 '/: and proceeds east 1/2 mile to a lake. Future Use& Conditions: The future use of the land will be for one home on each lot with a garage and possibly a small barn. The lawn of grass is estimated not to exceed one acre and the balance of the lots to remain in hay or natural vegetation. Design Parameters; The following items are fixed by others that apply to this project. A. 5 Yr. Storm frequency for general run-off calculations. B. 100 Yr. Storm frequency for quantity of water required to be retained on the property. C. Land use to be residential. D. Rainfall intensity curves furnished by the Soil Conservation Service. E. Constants, coefficients, charts and equations by Soil Conservation Service. Narrative& The procedure has been to perform a series of tasks in sequence to arrive at values for run-off flow and retainage requirements. Task one was to classify the soils found on the site in accordance with the soils conservation soil maps for the area. Page two Project No. KSIG 2001 Task two involved the classifications of future land uses to curve numbers for hydrologic soil groups and proportioning by weighed values for a combined CN for later use. Also, plotted drainage flow direction and length of flow on contour map. Task three was the use of rainfall intensity curves, CN's, watershed slope and length to establish a time of concentration for the site. Task four applies these various items to determine the peak discharge and quantity needed for the retainage pond. Task five was the completion of two percolation tests in the field at the site of the drainage area. Task six was the calculation of the pond size to hold the needed quantity of run-off water. Task seven involved the check calculation to determine that the required quantity of water will drain from the pond in 24 hours. Task eight was the modification of the contour map to reflect the pond location and elevation and location of the drainage swales to feed water into the pond. Task nine is the writing of the report, transmittal letters and copying portions of SCS Chapter 2 as part of the report. Construction Recommendations: Construct a pond in the NE corner of the property that is 200' by 180' top size and 160'by 140'on the bottom and 8.5'deep. This size pond needs to be 8.3'to hold the needed 238,291 Cubic Feet of water. Side slopes of this pond will be 2.35:1 which is within the stable range for this soil. The drainage swale is needed for the first 600' south of the pond on the east side of the subd. and the first 400'west of the pond on the north side of the subd. This assures the subd. drainage to go the pond and not off the property to the side as it does now. The bottom of the pond shall be left in the natural state as the soil is a mix of Olney 47 and Vona 67 both rated a "B" and have good permeability ratings, Sincerely, // i O,/ / George. Paulsberg Colorado P.E. # 35359 Enclosures: Calculations, graphs, tables, contour map and rainfall intensity curves. ruff- I Ii h ?-4) J ' e4 Lc uLY Tw.vf 7A • /lVe-12COGiov42 / PSrit i YI 1 I 1 � I U 1 0,05, ,•,,f4. 14./<94:-'4,v44( 5r,�Ds- • • A /G too( / 3/-o +/ ." ® I ' ' liAz re.r 44,0,/,5-74114(,,,,,. eo ONTr 1 5u Trot., �i,&r. ___,_� t _{ .,',1; 1 �('1'y I e1� Y 1 1' ' La'r,v ,�,�'.':"*�;1'54;:: j.....•.----•��l � �� d . " A4 u'pr, r .4.,e0f �7, . LNe�Y 1 G i t4Z' j eT.r .t a [) 4 1 --" • tt4- f ; . '. 1 i 1 L t 1` -1:.111 ', Y'--.'-I t F G'/lp/ ��1I '' I .�`, I ' -I �,.._ -tom ix.r.''''',/, 1 -.4..: E1 .4 �' I t j �... A t • , I I J. 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X , Worksheet 1: Runoff cure number(CM . 4 ,„,,,t,: Client ''' /�,S/� 20 a/ ey &i, r'? Dabs d i-d/ a. CpL.o, Da% Y x ;Chxrnty: L' • 1LYr. Practice r , kz k CN res ' Sou name Cover dncdpion . Product a.. 111'010;09k;: (cover type taatmant and . hydrologic oondmlon) (sore• CN x area w i.grou0:' Dab%2-3) or%) .?:J .1 Paola 2-1)• 0LNcI , • ,'. '7S 12 . Ca s,++1,go Ilorl� .x B SMAK 4�A� Pow C'Rop •�"i", '�;.; 6 5 3.70 �/�: 50 uwy/YL V Ap C 2 A lit GAtop CA-As< 6 I 8,• O 486, 00 • ,,. n .. +fit 1J"Si rJC ' : Totals a 4 S,m3 .13/9, To x • ,3/9,S 73.72 usCN• -71 r (,'>y�" tm CN(walph%d) - 45;el u } • 1�' + F y. • y , l +t :ct, J.. ' •ii.r: 7¢ ':. f( 2-90 yf W. sheet 2:Tkns of concantratlon and p A discharge ' Client ' We /4. 2 oO7 gi . P Date >'7/�D/ CannY 'r Ec D Mate Coco • Chocked Date Praise EaWtlaing Ilene al concenttaon 1. Dafr • RalnW dlatIbullon type l a -Tr 0.I&N.M) Drainage area A • •¢-5' ac 'y }> Runoff curve number CN • 7+ (worksheet') I .L' J4 T / • .11:,,,g•y(�5i, (" •:-•Wanbsd Mops Y a 44// % • ..1.1.1-tit, re• , •,, Flow 1. 2. 000 ft • 47 1. , /.OS hn 2. ,. Twang/.uMna�.Y.CN and figure 2-27 Ajd 2-5 Er r N _I_�� ( )o1( la „F.:, , T CN . his • c 1140 Yg•4 1101 )°1 f{,, EaYrnaing Pen dleoharpe Storm 11 Storm 12 Slam 19 t'`Y' .' t . : 2- 5 / 0 . r', C.`▪ 1. Fnquoncy n. , s In /. 7 2.1 '2.4 h . , 2. Rainfall P(2e-hour) ce- .i, ' .4 3• Initial abwacton,I1 In O, 7 e 3 (:) , 707 o. 703 .../,,,, .▪ ,,t... ";.'.(Ws CN with table 2-4) ri , , irk". O, 414 0.320 0 , 2-70 t% "° - ,. 5.:, Unit peek dbchtrgs q0 de/ac/In b,34 ,7.4-2. 0 .4-7 „ k (Ube Ta and I /P with exhibit 2.11) .. . In 0, o5 0 , S 0,70 uM, a Runoff,O 4 to , t (Use P and CN with figure 2.24 a Wile 2-2) yl t ;. . ,, ab a. 0.77 8, 5l 1418 r;qar ,x '' th7 Peak dleeharge,qt yir •till. Comma! hlltlq 0/fie. I till • 1H•IIIp1111 2.91 el Worksheet 2: Time of concentration and peak discharge 4,.la -•/r—S/ 200/ By Ea. P Date Z,Z Client -,k . County Wee-p State CO r'Q• Checked Date Practice Estimating time of concentration - 1. Data: Rainfall distribution type • ,z (I,IA,II,III) Drainage area A • 4-5- ac Runoff curve number CN • 7f (Worksheet 1) Watershed slope Y a /• // % Flow length .a • 2 d'/Xi H /.or hrs 2. Tp using�,Y, CN and figure 2-27 . or using equation 2.5 °6 1000 ) _ 910.7 I�(, CN ( )°s( )o7 • hrs Tc s 1140 Y0.5 • 1140( )05 Estimating peak discharge Storm M1 Storm 62 Storm$3 1. Frequency Yr / 00 2. Rainfall, P(24-hour) In 3..s 3. Initial abstraction,l• In O,70.3j j 1 - I (Use CN with table 2-4) o. /s5l I I 4. Compute 11/P ratios cis/ac/In o;'4y I I I 5. Unit peak discharge q„ (Use TO and Ip/P with exhibit 2-11) 0'• 6. Runoff,O In /. 4C I I ,:+k. I (Use P and CN with figure 2.26 or table 2.2) 7. Peak discharge,qp cis 12. 1 1 j t -t I (Where qp= qu AO) i c U.S. c•.•rn.•rn .r1911.; 011192 : 1190 • :u-491110611 2-91 ; I ; ' A/n/44H STdPv i kS /4 Zoa( • Z..-:01_40( '. • 9 . ,. 1yc, l� IZyc, �,�d4. f j _ ; i x� .; I -I I1 ' I i I I ' N • ii�ii. e CPC x . 4 o's c ,./9,,,v t.--• Go •m,,J, >�y c. _ -2 d -ier %� ra / y { •r 1 ' ' ( • I . Iii i �' / /VA, I s � ¢. ' ' i ` I xS � yr. F.:11:11-4, 2294 I 4 ., + : 1,:...t.1- 4444 / AM-, - / oyz. /c,zeiQIII _1 , ° W. {, 1 aro • /Ti B err k et, ree 6O AV i,kr, - ,SZ` Z$oI r /� ^�.� f� ;i'f• i i I i � *Y p 111 ; •• { ' • Go Sac-, k 6e Aii.v, s // `°:, 3 x i--/.3,46 o; r ' ts./{.Mi • I I ' i ' ....,... -1---;--6;04- G or LU oak circlet /r , ...R.v.✓0'FF Q ,... iAtanf ' %.:' I. I I ' ' i s •..mod' :sod)S ^ _ { /, �l �N >< 4SA" x •f3S6o �;1x • /fit _ 238, 9/;� , , e, (� ae /zit 8,, .:7! , 1 �},i I,__i c ' +- �;',0 • ',---1 1 a i • w6 ± I � I y i I 1 ' 1 •, CAT il ;;...4-- Pg,./ v4tc(S ,Dy 1 dCJ/r -ZDO( • ,; 6 C 4 PV f Pon/ p I S/a/mss I I r . , . < - 4. ; I , I I 1 ^ `.1 kb "• — ) 1- i -j i • , 1 I 't I I I 1 • c.rizz`. _ r I I , �L�SL.�.4FItA GN i *, , .1f Hi I -- . C. I l _. / /6ok /¢0 224002.92 { y, t r..-,'EE I I t -i ' -LU6 i n.. : go, A 2oox/8th - 36,000 ! YY I I ., I I.. 1 : I I • 7I �tot � /6th y Zo f I= IA-it/ � XX r. 238 '49( PT, • I I t _ gt ',' . l Iz . t I . _I_ I - t j — ) . :a :j : a 1 ; II I I 11 , 1 4 '2 St7/ fir3 8. Z� I i _._. I , _ w >' t x ;3 / � Z I , ,, 1 1) I A ,tt1!.. , . . i I _I }' � ', a •j's 1 .Me l I n I IIt., �elip 'tbv./ 9 t¢ r .i ._.. '_..I , . .l T. I. '' - I 1 . - t • i '..w '!? I I '! ' Fi t ` I Q I i 'P z . wtAi a: I Z I ( i i P•e, I I I'I is Ri ` Rau t I I 2— I ,. . I. I i h� 1�,ytR I,.IUAF iY+' i'i, q '% — . . . . 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It Z �' • 3 Krs I ' Q — 29 / ;9 20 f r'. ,4 8live I # /,M ZL 3 g/4''w , i,;r pay, / § .. b tit), I I I y , I I I 1 It J Dom, °F AG - S.rL Ctvu r6A of r/e" ire-Ole yr eel ' RAra r ' /N , 6G� u. i_ i4 i .w 2 kav �P i' ��o ( 1 I I }I I }I j I 1 I I --14:r" - '' t« i • C/G,�B y 4 7 5-a X;e'r t..3 -d',e S I ed1e• irji .:i a it 1 2.10 16. d /A+ , •it;Sr .. war; ' ' Vogn 7C rui/,tt , w/ I I k, I ? 6,ii 1.1.i2e j,.qY ` c 't "N��"t�f .r'i , , - 1,in t 4 1 L): /Della ' 6. 09 /� 7_-: of Soul .+ w :.zK,w So/� .tnr`� • ,, b ,A 1_—j i m/v: ; ! ,.4 /r.t, I.':i : _ ; .{ ' i 1. . .. '� .� i { / . i I 1 ' A,oT #Z'=/731 I/lf,nitiTar //Ca' FT. r 5-3 h, ..�,.r'o r mot, i e I rrda✓,rnuv# ' k•`' 2 /[d<i /( re_taw eft — tl re 1r �° y �� , , 6. `1 f t IE r 4eiffr or: Co/JAI.° Avarvi %r er, c ,,,9•7-7-o{,r.r 'f/S Z 2+cbt/=rr* .L C' . . . Aid• A I'1 ' /r, Az @ -tapir I. 1/t ail boo •r a; m�/� I [- I•r • i I i-61 x .11 AveeA4ocfs A�,ad.t ,/LR /N�, - 1 4.-- )Se..itz o f j , t I x ,,,. j ; 21 tots FT 'x 2'F.Nit: x60 1 /._ . . 2421.7-1'2 y 4i I I 31 ;v ; '///,. .'f."a, , �� /1 1238 yh9/Fr :� ≤/abato P�,e.44,v e _ k # ; _i r .M0 I` i PR,'44/466.- 5-7.-6.,pi, I 4 S/d to% 2-7/2-7e7 8 � i1 1/ A/ ' mc. 4ta. /i, , i , /o' t4-• 4-G to i 200 ' 343 , mil et, 461is ' v6,TK RE' t i , I 2.16:1 i � i i r ' • F . , 4 7 I SC/At � J� iyelf 65 12) 1 I l i i L ^1 _I _ I WCL4(.'/L p ; , 0P«' TPtit4 i I.-/-tie i . . sCcT/o .r 8— 2 • Y po iii 0Pra Omcd 428 North 2n° Street , ALLES LaSalle, Colorado 80845:xt. ,gu AND Telephone: 970-284-9582 4 4+ IC Fax: 970-284• I. ASSOCIATES, INC. PERCOLATION TEST DATA & TEST HOLE LOG r , 1 Project Name/No. %T!6- ?-ec, fop Location . VT Go2.vo,! -MO'. c44( vt. 8 Test Hole No. 2 , Depth of T.I1.1 t ', Size of Tin. yam_ TEST HOLE LOG ' 4 • Depth Soil Texture/Features 0$44Nicar d j /1- 28 • Jlr,✓s - mJ oA t 0•AA . r {f l: PERCOLATION TEST ' " cf, 4„, 086E /�[/GSaBR�S �4 Percolation test hy: � � s, ,-.4 4- Date of test 7--7- / 'time- Measure- Drop to Percol- 1 +'a Time Interval ment, water tion rate. Min./inch "'8` - '� Minutes ine•}tessr t/ ,2: 34- / S /. 99 6. o9 /es.7,./.er a /d.9 Adn. /AS v .n 2;4ovine. a,c�wj- / 17 O o7 t, h/ar . /Z9 to. �i.,e,r pot s o /$7, S• /.•r s /cc -0,-- 4.ue.y < a t -ei V If is r4 - DOS So,O •' " c /cc h.../Inythelona f.wa' ZLae k.a s. ✓ 3:39 /X /, ft ' 1736`r .n iN✓7tlfb 4. r)f Percolation rate =14. g- minutes / inch J Au itta 428 North 2n° Street j:;`SNI r 15440, :§ . ��I; LaSalle Colorado 80845�, , , �=�� ALLES AND Telephone: 970-284-9582;�ce1'-F:h��y sF Fax: 970-284- c ' 1- 7.,: ASSOCIATES, INC. 1 r'` s PERCOLATION TEST DATA dt TEST HOLE LOG Project Name/No. `SSG 2 0 / 0 `+ , ` , r� lic Location . tia Cot A__ Test Hole No. / , Depth of T.H. 2.o , Size of T.H. p, $' - '07,01 TEST HOLE LOG Depth Soil Texture/Features 0 - " 6 ��- N, c- 7r/4r - b'i -/L" /nA„,' l� y4 #V Ga�M '' /L - 2 ` L.e 'N t PERCOLATION TEST Percolation test by:S.o�� -/�u�s eRs -- ''- Date of test 2• -6 - Loa ( FY ` Time Interval ment, water Lion rate. • ime- ' easure- prop in erco - Remarks , u ' $ s t,,q Minutes inaheslr�• i-neltzs&`f Min. inch m.a 007 574sr „./ :,.•. ,:.. ._^_.,�:, D ,I LT r i 8 0. 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