Press Alt + R to read the document text or Alt + P to download or print.

No preview available

The URL can be used to link to this page

Home My WebLink AboutGrading Plans - 05/15/2020Grading/Stormwater Plan Accepted (Building Permit Released) Accepted by: Dan Mogen Date: 05/15/2020 � - - -_ _ _ --� -- _ � ---- > ;�, �� - J - � �� av�� May 15, 2020 Dan Mogen, EI, CFM Stormwater Engineering & Development Review Division City of Fort Collins Utilities 700 Wood Street Fort Collins, Colorado 80522 KEEFE CNIL, LLC 825 Union Street Golden, Colorado 80401 (970) 215-6808 meg@keefecivil.com Keefe Civil Project Number: 2019-017 RE: 5206 Fossil Creek Drive Drainage and Erosion Control Memo Parcel # 9602400032 Dear Dan: The purpose of this letter is to describe the proposed site improvements and potential drainage impacts at 5206 Fossil Creek Drive (Exhibit A). The 317-acre project site is a developed urban estate residential lot with established landscaping located just north of Apple Blossom Lane in Fort Collins, Colorado. Prior to recent demolition activities completed under a separate permit, the site had a two-story house, one outbuilding, several established trees, thick ground cover, and a gravel driveway extending south to Fossil Creek Drive. The lot is bound by existing urban estate residential properties on all four sides. The northern half of the site consists of Altvan-Satanta loams, while the southern half of the site consists of Kim loam per the NRCS Soil Survey of Larimer County (Exhibit B). The entire site has been classified as being within hydrologic soil group B. These soils are anticipated to have a moderate rate of water transmission. Historically, site stormwater has drained with gentle to moderate slopes from the northwest to the southeast. Historic basin A drains offsite to the southeast, into an open field, via overland flow. Historical basin B sheet flows southeast into the gravel driveway borrow ditch and travels south to a metal culvert, which drains beneath the driveway and into the residential property to the east. Historic basin C drains offsite, into an open field, to the southeast via overland flow. Per the flood insurance rate map (Exhibit C), the lot is located within Zone X. Zone X is defined as an area of minimal flood hazard and does not have a base flood elevation associated with it. The proposed site improvements include a two-story house, attached garage, a detached garage, two patios areas. and concrete driveway adjacent to the house. The existing detached outbuilding will remain. The proposed drainage patterns will remain consistent with the existing conditions (Exhibit A). Developed basin A will remain unchanged. The only concentrated flows leaving the property will be from the existing drainage design point 1(developed basin B). Developed basin C � k. � _� � � �+ � f� -�s � � � I� � `�+ _p _�• _'. _l� _� _� _� _� _1� _�, Q �r' '� � g � �} T� L� �`J 'C� Q ''�'' � � � G� '4 � � 'g � 4 '� �% � a��a a a c� a a� e�� a a a a a� d a� a�� a a a v v a v� v a v a v v v v a v�� a 4 v a�v � r ��, �.1� fl� �4� fl� fl� �'� �Q� ,�� Q� ,�'� �� ,�'� �� fl� �`e ,�'� p� �� ,�� ,�1� Q� �� tr ' ��#� 5206 Fossil Creek Dr Drainage and Erosion Control Memo Keefe Civil Project No.: 2019-017 Page 2 of 3 May 15, 2020 will drain overland flows, roof drains, and a small concrete area via two grass lined swales into a landscaped area southeast of the proposed detached garage, where the stormwater will either infiltrate into the landscaping and/or continue to sheet flow to the property boundary. The total impervious area will increase from 5.6% to 12.8% with the site improvements, which is within compliance of the Fossil Creek Master Plan's assumed percent impervious of 16.8% allowed within Fossil Creek Basin 53 (E�ibit D). Site Adjusted Site Adjusted Site Historic Site Historic Developed Developed Hardscape or Hard Surface Area (sf) Area (sf) Area (sf) Area (sf) Asphalt, Concrete 220 220 7,228 7,228 Rooftop 4,977 4,977 8,835 8,835 Gravel (40%) 6,454 2,582 3,870 1,548 Total Impervious Area 11,651 7,779 19,933 17,611 Lot size (sf) 138,090 Total Site Imperviousness 5.6% 12.8% The composite runoff coefficient and drainage basin runoff calculations for the historic and developed site are included in the enclosed tables (Exhibit E). Using the Fort Collins Stormwater Criteria Manual, the proposed stormwater runoff will increase slightly at the site. 2-year 10-year 100-year Basin A Historic & Developed Runoff 0.22 cfs 0.37 cfs 0.99 cfs Basin B Histaric Runoff 0.15 cfs 0.25 cfs 5.13 cfs Basin B Developed Runoff 0.15 cfs 0.26 cfs 6.31 cfs Basin C Historic Runoff 0.18 cfs 0.31 cfs 0.92 cfs Basin C Developed Runoff 0.20 cfs 0.34 cfs 1.27 cfs Based on the enclosed design, it is my professional opinion the additional runoff generated by these site improvements will not cause adverse impacts to downstream private properties. I herby attest that this letter for the final drainage design for 5206 Fossil Creek Drive was prepared by me or under my direct supervision, in accordance with the provisions of the Fort Collins Stormwater Criteria Manual. I understand that the City of Fort Collins does not and will not assume liability for drainage facilities designed by others. EYosion ContNol MeasuYes The structural practices for the site will consist of silt fence, rock socks, a vehicle tracking control pad, a stockpile management area, and a concrete washout area. The locations of these structural practices are shown in Exhibit A. The corresponding construction control measures fact sheets are included in Exhibit F. The anticipated disturbed area is estimated at 0.76 acre. The City of Fort Collins erosion and sediment control escrow calculations for the site are included in Exhibit G. After site improvements have been completed, all disturbed areas shall be seeded with approved dryland native seed mix or landscaped by the homeowner. ��v: ,� -G� -� -� -n -P -� -L� -� -� -P �� v v v v v v v v v v a e a e�e e e a a e a a e a e a e e e e e e e e e e a a a a a a a a a a a a a a a a v a a a v v a a a c > �� '� do �d �Q �� Qo ao �d �� Q� Qa d� �d �� d �d Q� �� Q� d� a� �� a� AAAA�A�AA�AAAAA�►AA�AA'AAG�A� 5206 Fossil Creek Dr Drainage and Erosion Control Memo Keefe Civil Project No.: 2019-017 Page 3 of 3 May 15, 2020 Thank you for the opportunity to submit this drainage and erosion control memo. Please do not hesitate to reach out to me if you have any questions or comments regarding the above items. (970) 215-6808 or meg@keefecivil.com �� Best regards, Megan L. Keefe, PE / Manager Keefe Civil, LLC � ��PDO LICF� O�.•��N�� f':SFO . G. cc . F s�`� m't : 39378 : . . �pv�/�.�_ . �, i ��-��y-- a ,�, > > �" � �c,� a, � � � U�FSS�ONA� EN�\� Enclosures Cc: Chandler Souther, Hammersmith Structures � -� -p -p -G� -�. -� -G3 _G'� -G3 -� -p -� -� -p _� -G� -� -� -n _P -� -L� -� -� -P V O� D O r1 O O O O Q O O O O�7 O O� V Q � O � O r� a d d e e e a d d d d e a d d e e d d a d d d d � a a a a a a a a a a a a a a a a v a a a v v a a a c > �� '� do �d �Q �� Qo ao �d �� Q� Qa d� �d �� d �d Q� �� Q� d� a� �� a� AAAA�A�AA�AAAAA�►AA�AA'AAG�A� - -- -- -- -- -__ - _ -� � � � - - � � - m - - - - - , ;- --' �- - _-- - _ - - - � � ��^ -- �--� \ � � ,. -� EXISTING Ol11BUILDING TI REMAIN N �`.�t / /� I . _ � � - � - �� . � _ � � � � ./ � \I, � . � � GRADING LIMITS �� o _ i � � � A�I -, � � , �" _ � � t i � � � - / � �' �� /� . � �. � -h, � � � f � � � � I. - ��. b _ o � � � � ��- � �� - - - ., � r �� , � ,�i�, � I �, � �j'�� _ � i \ � � �oiA� . w i � . . . ' � � I ,r-F,.�t _ F� .. . � . .. son.�� , ' . r � � - � . .... �. . . F� - �-, �� .. � ,. � � _ - �o a' s �o zo � � �� i r `� � --- = -------- -- - ,.'_ L �'� ,� � ./ .�� . -• ..,_� i- _ - - -5019 �� I �-_..�._ __ � % � I / � o � - � � , 5019 � r� � . � - . � -, ' . GRADMG LIMITS � � � � � r.i �.z �� . , - � ' � 3 '�� ' ' , \ � 1" 10' ._' _" .._/i `. �..�.. F� �Ilsoi9.o _ . �� -_.. soie.o '� _ , sozu � �sozo.o ..... � ._- / sozo.ao � ,- ' ' � FG �, . FG1B � 5019 G �� FL \ � - J _I. -� � ° `\ � ' r - � I . � ` , : 5020.34 ` 5020 0 FS � " .0 � '\ ,�5 � Fa= o I ' S020.50 � �•,. ��... rs / aC acREs g � _ � a � �-so�s,ea "' �� zo.a� N -� f,�p //_� ABBREVIATION LEG�ND: Ij � �� TOF-5020.50 / i I � � "' sazoso -"- � ' % _ � I 1 .� Fso2o.o MIN. GFF-5020.00 5� S�' ...'� soi9.00 _- -- ' : g i _ a - _- ' � DS DOWNSPOUT . . _ �- ' ' � �P F '� � . � I � w DWG DRAWING . _' _- ,; , ._ a, � �� _ I�' I_i . �I�� ' F02o.o1 . ' 1 I o Q EG EXISTING GROUND -� . I - ' I EXISiING CONCREfE BASIN �' FG FiNISHED GRADE �-- - � : To eE REMoveo i, I FoiB.fil_.soie.s da / aisriNc sioNe wa�� IIIII�I ��, 4a , �d �'SoiB_69�' PROPOSEDGARAGE � O�`�' F� 4 i � - TOP OF SLAB=50"19.00 , ' � ��--�� Fs f� I--� �, veo � ,,�,��., � "aoi� - e � � �� TOF=5019.50 I � � �� , � PpDO LICF G� GROADEEBREAR�ACE CONCR�E � I I � aa _ J ro BE QEMo II . P o�O.....�....NS� G�F GARAGC FINISHCD FLOOR � � ' � � , a ° 4. sozo.3�, _5o2a �sa2a.00 1 � � � � � s �s � o.•�PN kF�,o - � � J � �, _ c�- / �/° � „ ROW RI�CHiP01NTW.4Y �� ..._. : � � 06 , �-., . 9_° 21� FS . �,.it�i I _.., � I � �'FS� � ��Fs � � Eq�S GB a ��. a � Qa � 67 � I �- �� :� 39378 �e a 5020 00 �' . k / m '-IP HIGH POINT 0.3 5020 I � -- m,al,�� : : � � ^ _ / � � I \ 50 I I , ' S0 .00 � • • / . I/ _ m q '. : � / i-E INTO EXI>TING ABANDONED -�';. T, '9 �� F � / . ' , � ' G.� � F �5 9 I 9OFtC•'••••• •': \�� F� ' soza.00 � � I � ,'� �� e eote.o 2o.s' � SS/pNALEN� a � 2 a \ . 5018.4 4 %/ d� Q�, SO18.50 r` _ 4 . � ` 9 , , Rq\ Fs�ce� � _ � �� a , _ . . , : - Fs � iaeicnrioN cHnNNa � - - � � ' � 1 ' ' - - - I � �� F020.50 EXISTING TREE TO BC � 5018.9 � RF� ¢ 5019 � ry L '... 10 0 . 50 S FS a �, P � � y ' S 0 �\ rC � FL�LP .. 502050 , 4 4 � 5016-6,. (sozo.o) , �p , � ��a' ' ° �`� ° � � �m y � 501 B i � 9 � LEGEND: � � �� PeorEcreo m P�ace•• Fc \y e' a � oe � -��' ` � � � � J _ i89 .e ' a /�E 4 _ , - _ . 501�.1 � , \�,� 4 � AK�. ' Fs/GB , a � � _ _ 5077 � . � --� O �-`��- EXISTING CONTOUR -- � r� � � � � d � � �oEi � , �„ � , � � � � _ �, ' �� i , . � _ . c � � � w v > � 5018.9 �. � '� 4 5016.0 4890 FROPOSED CONIOUR . Fc �� , ! �' � Qa ' . - FL/LP . � � � W _- _ � �� 0� � - � � � �'. � ' �-� � . � �, - � , 601 S � � ' . , , Q�� _ � . .. � / � z � � w X ` . � 4 ioq rc , t , saie.s � - -�� a� `"� � n sos ce � -� LW z w�" @J � PROPOSED SPOT ELEVATION 5018.9 F� e SOt8.23 a _ � ` .. - Fs/ce � �� o a ' ,_ � i,`L� � . � ' . �O� Lk� CXISTING SPOT ELEVATION \ 5016.9 � 5018.�� F� e� � ° 4 . � ,_ - '�-�- �� I Y w O m� X , . ' y �� F� PROPOSED RESIDENCE , ' F� � � � � a : �'=4 i . a I �, FF-5020.50 i�� 2� PFOPOSED SLOPE _ � � TOF=5019.40 d � ' ° � � � ' � �� •' ■ f- � 2 �oie�e �,� � ', _�� .� . �� d � �' � , � �� , 4� � , � �� %� EXISTING SLOPE � �� I ' � 4 a � , � a I 5p� � , � � � � � �. ■ � . � � 5018.1� � \� � ' , � / . 1 . . , a ` O \ G 4 ' � , � � I�. � � .� I p , I I / o � m .' • b018�6 , �� a� + 5520.50 a F ` � a � � �a �. , . � � PROPOSED CONCREIE -� . FG \ a � � - . 5o14.a6 � � i � 4 \ � , 5098.3 Q a � I , FS/GB 5 i FG � r _ a �� , �, � � .. 5018.9 I 4� . ��a. - � - , - ' � 1s9, o�p fS'��a FG `� ' d ' n � � � 1 i - _ - - ' � . � EXISTIN� C�NCRETE _� � \ 5018.3 5 a`a � n9 q�'S016�4 I.. � a -��15 I a �•� , �� I I 1 1 � a �� Fs��g �� i o �, 1 T �o � ` s� �� " � Fc s�° � `� �� ,�� - � �- ,. \ �n ' ''1 `�.' ' '� o F020S0 ,�� \ :• � I G' �� ' ' 1 I , �d - . "� a a a . ' �513.84 � \ I � '- „' ` , c i 20 31 l \ \ � PROPOSED GRAVEL \ �� o .. q ° ' � . ' ' _. �2. /��/�J 1 S /\ . SO15.15 : ' I b -� \�'g ' � . \ \S/ ` � � 9 Fo � � . �^ ' \ � FS GB ti �� , � � ' / � . , 5 _ i o � . , .. �� , . � � - P�ZOPOSED ROWLWE ��0 5oie.s � ., ., . , FS ' u , � ' .o.zc� j � o �r � , � , - . � ' . \ , _ 5020 / , 1 � . ' _ . . . , _� � . r f � ��s/cB � ��\ � � � \ O ,. , \ � � _� �-� � (�' � - PROPOSED DOWNSPOUT AND fLOW DIRECTION , � � s�i se A � � � ��; „ 5� �� 3 88 � � , �� ' � � � o FG �� , � � � , _ N, . �, _ � _ _ FL � I 0 � a • PROPOSED WATER SERVICE soias sota.e ta.9 p� � � � ._ . :. � � �� . � \ W a^ - vc - � ER'ISTING UN�ERGROUND GAS � h � � � � � � � � \ / __, _ _ G� . F� .MI S OF PROPOSE� � � � F .c� �[bV �"2AVEL . O \ � - i �� -• °" PROPOSED 11NDERGROUN� GAS SERVICE �. SQ � Soie.s 1 � - � � _ o i � _ \ Ig Fc .. �p. �' . J � � c 5p13 � ..li _ Darvrwnv soi5s �- �sot8.6 _ ,. ��.- - c, (Y� �- - EXISTING OVERHEAD ELECTRICAL \ . F�/cs - \ � � j � , / _ � �� . , � y, F`pc � � i ' ., � � L .� �`� / �� . �� . � 0 . _. ., Sp' ` 50188 � '�a �/ _ EXISTING UNDERGROUN� ELECiRICAL SERVICE � � �� f � � � '_ I _ � � I , � � . � � . O O � � ,� i� � Fv � � � GRADING LIMIT � � � � � � i � � � - - �-� W � ' °- PROPOSeD UNDERGROUND ELECTRICFlLSERVICE � � � V ' �� I �� r V ' � �' - � �Q J � 5�� _, - � soie9 �% iY1 �-� J �, � - � S 5p12 �i� � L � � � „ exisriNc FieeR oPric seRvic= � , � - , �, � . � i � __ ��' � � ��io �� p O � / // � _ � J J � � � �_ � , �� _ � I - Y o � CXISTING WATER SERVICE � \ � - _ �_ _ � � �� I � � �I i . ` W a _ �. GRADINO LIMITS � ` � i � /J � ' i � � � � � - .. �°c� I � � U � �_ � --� � �� - i C� (A ,. � A , � cRno�nc NOTts� � - - _ �� , � i: i / � �� J Z Z i. TOP r�F FounoniioN Musr aE nT �Easr s" naovE THE HictitsT cRnoE � \ �. ��. - - - _ - -- ...- �, .- (n m � � ', � � � J SURR�uNoiNc A�� euu_oiNcs. � - � � i r .. � \ I .� �, / � (n � J � , . � - � � h° � � 2 THERE MUST BE A MINIMUM GRADE OF 57 AWAY FROM THE BUILDINGS WITHIN THE � I (5015.0) \ � / ,_�-_ �� / � � ` O Q O F!RST 5 TO �0 �ECT ADJAGENT TO THE RESIDENCE. �'=_,�J� � � � � i (^ � � U 3. ALL SLOPES MUST MEEf THE MINIMUM REQUIREMENT OF 19 AN� ARE NOi i0 BE � LF� ' r � �/ r / � ��\ �� I � STEEPER THAN 33% (3 �) _ r � I \ I ' ca •ow�.� `,L � 1 . / � � ' , _ , �. � i ? � ��! p �- na aEsnr� 4 ALL CONIROL SH4LL BE VERIFIED BY THE CONTRACTOR �E�ORE ANY L`�� wroac �i/ �� I II ��,," N � � CONSTFUCTION OR OTI'ER IMPROVEMtNTS r _� I L, r" � �' I � O 5 ALL FXISTING TREES T(� BE PROTECTED IN PLACE UNLESS OT.iERWISE IN�ICATEO 41 \ r� \ I � - � / �o ' I II � HEREIN � � I j fi, TFIC LOCATION OF UNDERGROUND UTILITIES AS SHOWN ARE BASED ON O�SERVED 1�� \ � \ I I I �� L � � / � I � I r� r_r I_ EVI�ENCE AN� UTLIiV MARKINGS AT TIME OF SURVEY. AODITIONAL UTILIiY LINES I �� \ \ I �' � J �,� J / / MAY EXIST. TNE EXACT LOCATION OF ANY UNDERGRUUND UTILITIES SHOWN AND � \ � - ' THE LOCATION OF FlNY ADDITIONAL UNDERGROL'ND UTILITIES SHOULD BE L \ \ \ ' I � 4 � � / �I _ / I ( r _ 1 0 I � �EfERMINED BY CONTACTING 'ONE CALL'" FOR A UTILIiY LOCATE. -'�r � �� -.._I I-'-r I.. / BE�CHMARK' CIIY OF FORT COLLINS #43-94, ELEVATION = 497268 LL. r\ I � 1 I ' I � I '� / - � / I I �� / `��to.$) B ALL CON1'ROL SHOwN SHALL BE VERIFIED BY iHE CONTRACTOR BEFORE ANY {� � � / -"" i CONSTRUCTION OR OTHER IMPROVEMENTS. �'T `�� \ � � ' I L �L 1 � ( 1 \ � � \ � I � � I ��(50'�0.1) I % � � l6% \ . CONTACT INFORMATION: \ � � � � � I \ � I I �' HAMMERSMITH STRUCTURES, LLC ' � , � . � I i 'C , � I I � � 201 COMMERCE DRIVE �2 , FORT COLLMS, COLORADO 80524 , SHEET ATTN: CHANULER SOUTHER (970� 381-7699 Knowwna�s6elow. 1 OF 3 CNAN D LER� HAM M ERSM ITH STR U C?U RES. CO M CBII be(ore you dig. EXISTING RESIDENTIAL C ��M�T� aF �RA��N� r�E � 0.26 INTO EXISTING GROl1ND. J~ � � �ls0�ry,�--��- � � . . _ . --- _ k � �. � T� I I � I_ �y ��_. —: �' I '/I \ . / ' �\�� \ ��a F �.. `Yl«.,� �1=y� w - �� i� ,^'f ��.. � ' -.�r��'� — — T : � I �\ 1 3 - - \ �- o � \ � i.� — �:�� , � J I � _ _ s � � � 1■I � i _ � \ � o Q / . � I ,i��..� \ � . I f � Y � ■� r'l� ��L� I I r ��_� _�. 1_� �J I _ II T• i'�� i � uMirs oF orzaoiNc. ne �� .' ' ' ,.- ' �� _.. ��" - `�� inrro e�isriNc ceouNo � r � � � � ' /� � � iy � � ., Y S - i J� ✓� � � �� ` � r . �� SP� i - � � J � � '��.- , -' ��`- - , � — - � � ,��" � PROPosEo aui�oiNc � I � _ ;' � /' � TOF=5019.40 �'' ' / \ � � � � T (� , B _,��%� i : ��/" ; " i � �, � � - � �� 1. � � cwa � � 2.53 � ��„ ,-� �. , � i ��+ \ \\ � � �� ' � ��i _� �, I � ! �' ; , , �� _ �_� , � �� sF �-�� 'r � � � �_� � , , i -'�- 7 �,.� ., . , c �-��-,-► ' �� ,e,, � � t� � � - A V � � � uMRs oF canoiNc nr� ' � � � � . � �� /�",Nro exisiN RouNo ' \ � r� ` �� 1�� / � EXInTWC. RESIDENT!AL � r _ _" � , �� ■ � �, `� � � � � �t�� z \ �� ' 1 � — � �' � i � � �� I \ � \ � � A �� I '-� � �a � .'�� i � V � � \ '� � � � �. A X� ��, � � �� '� � '� � � ti � �� _ � ��`i� li � , ��. I r- � \ �� ' \ \ � ; ,, 1 � �� :: � � � � �� I � � \ � � � � \ \ � � ' �� . / \ '� ; / ` " 1 � i� � �V � \� �" � �I 038 � �� ,� � , — � � �� ,; �, � � �_�� i � � � i ��` ,i ,' _,�!,1 -�'�T � � I� J,� , � � ; , ,°`� ; o LEGEND: 5020 � �� ✓�r► � , � �� — � �-_ � --� �, . .�;=.�—•� � , �� EXISTING RESIDENTIAL EXISTING CONTOl1R PROPosEo coNrouR PROPOSED CONCRETE PROPOSED FLOWLINE CONCENTRATFD �RAINAGE FLOW DIRECTION OVERLAND �RAINAGE FLOW �IRECTION � � � � � �RAINAGE BASIN 80UN�ARY � oRnwnce ensiN io g oRniNAce ensiN nReA �ACRes) 5.00 � oRnwnce ensw oesicN �owr BMP CONTROLS: �F �F �F SF N`� C S P ,�o l vrc � CWA s��T FEN�E STOCKPILE MANAGEMENT WITH PRGTECTION VEHICLE TRACKING CONTROL CONCRETE WASHOUT AREA � � �� j�I %� '� III . I ,jl l � i ; �' I l� J i ".,�_ �.3'. I � - . _ � I'n' � ] 1 `32 S'�"`N � CI c cl= 3� 6:;' i - ; � � � Y W w ¢w U > J � N 0 � � ABBREVIATION LEGEND: nc ncFF> �WA ��RETE WASH��T AREA DS JOWNSPOUT DWG DRAWING EG �XISTING GROUN� FF FiNisr+Eo F�ooR Fc FiNisHEo cRnoE FL FLOWLINE FS F'INISFiED SURFACE (CONCRETE) GB GRADE BREAK cFF cnRnc� FiNisHEo F�ooa HP HIGri POINT LP IOW POINT Row Ricili or wnr sF s�1 FeNCE SP STOCKPILE VTC VEHICLE TRACTION CONTROL 30 (1' I S 30 60 � s' = 3r�' FOR DRAINAGE REVIEW ONLY NOT FOR CONSTRUCTION EXISTING RESIDENTIAL Adjusted5ite Site Adjusted5ite Ske Histaric Historic Area Developed Developed Harduape or Hard Surface Area (sf) (sf) Area (sf) Area (sf) Asphalt, [nricrete 720 220 7,218 7,128 �rmv ayn a,sn a,sss a,a3s �ravd �d4Td1 GA5�6 2.Sa2 3.n7G 1.-ria TotallmperviousNea 11,651 7,779 19,933 17,G31 iotvxei l 138.OS� TaGI She Impariouv�� 59K 17BlG �� IOww what§ 6eloW. CB�� be(ore you dig. 0 0 39378 J _I � O � >wo > U��W �nO �LL Ll � z '� Y WzW�@J ��oU' YW°�� r j� � �1 1� �1 1 r�� _` � � Z a � o w W a � � /R Q V o Q Q O w Q � O W U � Z c� c�npVJ O � Z O o N � r � � � � O � � aW SHEET 30F3 3 � 0 492830 40° 30' S5" N � _ .- .I 492850 � �� -� �� .�!' 7Pt � � � � �� ,� � ,'�'� �� 492870 � � � ,�. �,.--+�� , , - � ' �+ �3 � � � ,' '� � � '' � _ +� ��!� �I � �� ,_4',�,�, � '� � — --__ . . _ . — _ . . 4 „�. � _ _ _ �va�i�r " ' L'��Y ��. � ' — . _ T',� " . , � ��' � — � - . ' A.. � L _ -5. ' ':� ', So!i:l Map may not be�,valid at this scale. �a� �'" ��; 40° 30' S1" N � • '�`.' - -Y�.._..� G�.r� _ _ _ _ � L � _ � _ ` '. �i j . � � � I r � � � C 492830 492850 492870 49289D 492910 492930 492950 492970 3 v � Map Scale: 1:866 if printed on A landscape (11" x 8.5") sheet. N Meters 0 10 20 40 60 /V � 0 40 80 160 240 Map projection: Web Merotor Comer coordinates: WGS84 Edge ti6: UTM Zone 13N WGS84 USDn Natural Resources Web Soil Survey � Conservation Service National Cooperative Soil Survey Hydric Rating by Map Unit—Larimer County Area, Colorado (Pearson Residence) a�za� aszsio a��o as�9so asz��o asz�o � � � I � � y �� ; _ � -�� I M� � � .r...r.,� . ".,� �` ¢, ;,�, , , �, -r..,�F � � � � v 0 493010 ;� , I ,— �"��j 40° 30' S5" N � ,� - � �. � _ :� � _� _� � � � � ! 4 'r I � 40° 30' S1" N 493010 3 � "v 4/28/2020 Page 1 of 5 492�JD Hydric Rating by Map Unit—Larimer County Area, Colorado (Pearson Residence) MAP LEGEND Area of Interest (AOI) Transportation Area of Interest (AOI) � Rails Soils Soil Rating Polygons � Hydric (100%) a Hydric (66 to 99%) � HydriC (33 to 65°/a) 0 Hydric (1 to 32%) � Nat Hydric (0%) � Not rated or not available Soil Rating Lines N.wr HydriC (100%) r r Hydric (66 to 99%) � e Hydric (33 to 65%) � Interstate Highways US Routes Major Roads Local Roads Background �j Aerial Photography r � Hydric (1 to 32%) r; r Not Hydric (0°/a) .� Not rated or not available Soil Rating Points � Hydric (100%) 0 Hydric (66 to 99%) � Hydric (33 to 65%) 0 Hydric (1 to 32%) p rvat Hyd�� co�ra> 0 Not rated or not available Water Features Streams and Canals MAP INFORMATION The soil surveys that comprise your AOI were mapped at 1:24, 000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Larimer County Area, Colorado Survey Area Data: Version 14, Sep 13, 2019 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Aug 11, 2018—Aug 12, 2018 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. USDA Natural Resources Web Soil Survey 4/28/2020 � Conservation Service National Cooperative Soil Survey Page 2 of 5 Hydric Rating by Map Unit—Larimer County Area, Colorado Hydric Rating by Map Unit Pearson Residence Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 3 Altvan-Satanta loams, 0 0 to 3 percent slopes 54 Kim loam, 3 to 5 percent 1 slopes Totalsfor Area oflnterest 1.6 1.6 3.2 49.7% 50.3% 100.0% USDA Natural Resources Web Soil Survey 4/28/2020 i Conservation Service National Cooperative Soil Survey Page 3 of 5 Hydric Rating by Map Unit—Larimer County Area, Colorado Description This rating indicates the percentage of map units that meets the criteria for hydric soils. Map units are composed of one or more map unit components or soil types, each of which is rated as hydric soil or not hydric. Map units that are made up dominantly of hydric soils may have small areas of minor nonhydric components in the higher positions on the landform, and map units that are made up dominantly of nonhydric soils may have small areas of minor hydric components in the lower positions on the landform. Each map unit is rated based on its respective components and the percentage of each component within the map unit. The thematic map is color coded based on the composition of hydric components. The five color classes are separated as 100 percent hydric components, 66 to 99 percent hydric components, 33 to 65 percent hydric components, 1 to 32 percent hydric components, and less than one percent hydric components. In Web Soil Survey, the Summary by Map Unit table that is displayed below the map pane contains a column named 'Rating'. In this column the percentage of each map unit that is classified as hydric is displayed. Hydric soils are defined by the National Technical Committee for Hydric Soils (NTCHS) as soils that formed under conditions of saturation, flooding, or ponding long enough during the growing season to develop anaerobic conditions in the upper part (Federal Register, 1994). Under natural conditions, these soils are either saturated or inundated long enough during the growing season to support the growth and reproduction of hydrophytic vegetation. The NTCHS definition identifies general soil properties that are associated with wetness. In order to determine whether a specific soil is a hydric soil or nonhydric soil, however, more specific information, such as information about the depth and duration of the water table, is needed. Thus, criteria that identify those estimated soil properties unique to hydric soils have been established (Federal Register, 2002). These criteria are used to identify map unit components that normally are associated with wetlands. The criteria used are selected estimated soil properties that are described in "Soil Taxonomy" (Soil Survey Staff, 1999) and "Keys to Soil Taxonomy" (Soil Survey Staff, 2006) and in the "Soil Survey Manual" (Soil Survey Division Staff, 1993). If soils are wet enough for a long enough period of time to be considered hydric, they should exhibit certain properties that can be easily observed in the field. These visible properties are indicators of hydric soils. The indicators used to make onsite determinations of hydric soils are specified in "Field Indicators of Hydric Soils in the United States" (Hurt and Vasilas, 2006). References: Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Pearson Residence USDA Natural Resources Web Soil Survey 4/28/2020 � Conservation Service National Cooperative Soil Survey Page 4 of 5 Hydric Rating by Map Unit—Larimer County Area, Colorado Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S. Department of Agriculture Handbook 18. Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service. U.S. Department of Agriculture Handbook 436. Soil Survey Staff. 2006. Keys to soil taxonomy. 10th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. Rating Options Aggregation Method: Percent Present Aggregation is the process by which a set of component attribute values is reduced to a single value that represents the map unit as a whole. A map unit is typically composed of one or more "components". A component is either some type of soil or some nonsoil entity, e.g., rock outcrop. For the attribute being aggregated, the first step of the aggregation process is to derive one attribute value for each of a map uniYs components. From this set of component attributes, the next step of the aggregation process derives a single value that represents the map unit as a whole. Once a single value for each map unit is derived, a thematic map for soil map units can be rendered. Aggregation must be done because, on any soil map, map units are delineated but components are not. For each of a map unit's components, a corresponding percent composition is recorded. A percent composition of 60 indicates that the corresponding component typically makes up approximately 60% of the map unit. Percent composition is a critical factor in some, but not all, aggregation methods. The aggregation method "Percent Present" returns the cumulative percent composition of all components of a map unit for which a certain condition is true. For example, attribute "Hydric Rating by Map Unit" returns the cumulative percent composition of all components of a map unit where the corresponding hydric rating is "Yes". Conditions may be simple or complex. At runtime, the user may be able to specify all, some or none of the conditions in question. Component Percent Cutoff.• None Specified Components whose percent composition is below the cutoff value will not be considered. If no cutoff value is specified, all components in the database will be considered. The data for some contrasting soils of minor extent may not be in the database, and therefore are not considered. Tie-break Rule: Lower The tie-break rule indicates which value should be selected from a set of multiple candidate values, or which value should be selected in the event of a percent composition tie. Pearson Residence USDA Natural Resources Web Soil Survey 4/28/2020 � Conservation Service National Cooperative Soil Survey Page 5 of 5 Hydrologic Soil Group and Surface Runoff---Larimer County Area, Colorado Hydrologic Soil Group and Surface Runoff This table gives estimates of various soil water features. The estimates are used in land use planning that involves engineering considerations. Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The four hydrologic soil groups are: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Surface runoff refers to the loss of water from an area by flow over the land surface. Surface runoff classes are based on slope, climate, and vegetative cover. The concept indicates relative runoff for very specific conditions. It is assumed that the surface of the soil is bare and that the retention of surface water resulting from irregularities in the ground surface is minimal. The classes are negligible, very low, low, medium, high, and very high. Report—Hydrologic Soil Group and Surface Runoff Pearson Residence Absence of an entry indicates that the data were not estimated. The dash indicates no documented presence. Hydrologic Soil Group and Surface Runoff—Larimer County Area, Colorado Map symbol and soil name Pct. of map unit Surface Runoff Hydrologic Soil Group 3—Altvan-Satanta loams, 0 to 3 percent slopes Altvan Satanta 45 Low B 30 Low B USDA Natural Resources Web Soil Survey i Conservation Service National Cooperative Soil Survey 4/28/2020 Page 1 of 2 Hydrologic Soil Group and Surface Runoff---Larimer County Area, Colorado Pearson Residence Hydrologic Soil Group and Surface Runoff-Larimer County Area, Colorado Map symbol and soil name Pct. of map unit Surface Runoff Hydrologic Soil Group 54—Kim loam, 3 to 5 percent slopes Ki m 90 Low B Data Source Information Soil Survey Area: Larimer County Area, Colorado Survey Area Data: Version 14, Sep 13, 2019 USDA Natural Resources Web Soil Survey 4/28/2020 i Conservation Service National Cooperative Soil Survey Page 2 of 2 National Flood Hazard Layer FI RMette 40°31'8.62"N � 7 v� r �, � R +�� ' ' ar . _ _ •, �'• � ., +� � j I . �,� �k, � � 1 r -� 1 � f , ` �A t � � �� , � � � li � � . . - - .,� .. � � ; �� 'F "` • I 1' � • = J . � � �' 'T, - � � � �� l� �•�•_ `!� ! . .�•. � � •�.• � . �, " � • • ♦ ` • ' � ' • l � � � - l� t . w r • ,• , � � * _ � r ! - � . ` ♦ t � � ' `�M , ! .�,�,� ,�;F:EH�'�F f:IIPJIP,I�L FL� �� .C'.H.,�� _�T�- r � � • � L r� y - ��'I��i.'� �:. ,� ~• ��I . • � � ��.i.ir�.i��;�. . � ��, i �.,;-�� _ ' '�' ' I' I �� • ♦ •� � � � - •� • �• �s � � + r _ � i -- �� . . . � � �, -, � • • � ! � �d • � . , +" •. �� • '�".� � r�-. - �1� i�� r, � - ► �,�'�: � � . � � �1 � . t� �' �, I � �� r 1 .,� � ' ` , ` � 0 250 500 �J ' , '` . - ,� , ► -- � 1,000 �� !�' �~ ,�.i � � �' �_... _ �►;� 1,500 � / .',�� -• �� , �.�,�.•i� ,•. , i '�- � j � � # �� i ��"� _ - f ��.,� +�.� . :` � �r ► US�S I Ite�Nat,��nail M'� � Feet 1:6,000 2,000 �� FEMA 1 � 1 ( ' � ' . i �' � � l ' :, � � �� - I � � � � r� � "', � �_..t.. �. _ .� . ' 'd �' f L �+■` � � �. �r� � � • �� f I l� '� �E I��'�I� 1�� '�I.[.11�1�� ,,,,,,l,yi �� . � "�� _��♦ ,�� Z ,�I� � � . . ♦ • 4 � • rl � Orthoimagery: Daia�ef'reshed A�ril; 2019. Legend SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT SPECIAL FLOOD HAZARD AREAS OTHER AREAS OF FLOOD HAZARD Without Base Flood Elevation (BFE) Zone A. V. A99 With BFE or Depth zone ae. ao. aH, ve. arr Regulatory Floodway 0.2% Annual Chance Flood Hazard, Areas of 1%annual chance flood with average depth less than one foot or with drainage areas of less than one square mile zo�,� x �� Future Conditions 1% Annual Chance Flood Hazard zo�,e x Area with Reduced Flood Risk due to Levee. See Notes. zo„e x Area with Flood Risk due to Leveezo�,� o NO SCREEN Area of Minimal Flood Hazard zo�,r x 0 Effective LOMRs OTHER AREAS Area of Undetermined Flood Hazard zo„� o GENERAL '--' Channel, Culvert, or Storm Sewer STRUCTURES i i i i i i i Levee, Dike, or Floodwall � Cross Sections with 1% Annual Chance ��•5 Water Surface Elevation �e - - - Coastal Transect ,.... 5,�..,� Base Flood Elevation Line (BFE) Limit of Study Jurisdiction Boundary -- --- Coastal Transect Baseline OTHER _ - profile Baseline FEATURES Hydrographic Feature MAP PANELS W Digital Data Available N No Digital Data Available 1 �� Unmapped �� The pin displayed on the map is an approximate point selected by the user and does not represent an authoritative property location. This map complies with FEMA's standards for the use of digital flood maps if it is not void as described below. The basemap shown complies with FEMA's basemap accuracy standards The flood hazard information is derived directly from the authoritative NFHL web services provided by FEMA. This map was exported on 4/7/2020 at 11:25:27 AM and does not reflect changes or amendments subsequent to this date and time. The NFHL and effective information may change or become superseded by new data over time. � This map image is void if the one or more of the following map o elements do not appear: basemap imagery, flood zone labels, � legend, scale bar, map creation date, community identifiers, FIRM panel number, and FIRM effective date. Map images for unmapped and unmodernized areas cannot be used for regulatory purposes. Megan Keefe From: Dan Mogen <dmogen@fcgov.com> Sent: Tuesday, May 12, 2020 3:31 PM To: Megan Keefe Cc: Chandler Souther (chandler@hammersmithstructures.com) Subject: 5206 Fossil Creek Hi Megan! I hear from Chandler you're working on a plan/memo for this project, and I wanted to pass on a little info as this lot is a bit different than most of those I've talked to you about since it's not in tight neighborhood blocks where runoff just needs to get to the street. I'll want to see where this lot is draining downstream (continuing that historic pattern) and that it is in compliance with the Fossil Creek Master Plan's1 assumed percent impervious for the basin (16.8% for Fossil Creek Basin 53 in this case). I hope that provides some clarity to what I'm looking to see, but please don't hesitate to give me a shout if you'd like to discuss anything on this one. Thanks, Dan Dan Mogen, EI, CFM Development Review Engineer Stormwater Engineering & Development Review Division City of Fort Collins Utilities 700 Wood Street Fort Collins, CO 80522 (970)305-5989 dmo�en@fc�ov.com Fort Collins ��- Uw�� Composite Runoff Coefficient Calculations 5206 Fossil Creek Drive, Fort Collins, CO � ( C,sA; ) C = '-' �� Where: C= Composite Runoff Coefficient C, = Runoff Coefficient for Specific Area (A,�, dimensionless A, = Area of Surface with Runoff Coefficient of C„ acres or square feet n= Number of different surfaces to be considered A,= Total Area over which C is applicable, acres or square feet Equation 5-2 Historic & Developed Drainage Basin A Historic Drainage Basin B Developed Drainage Basin B Historic Drainage Basin C Developed Drainage Basin C Minor (2- and Minor (2- and Minor (2- and Minor (2- and Runoff 10-yr) Major (100-yr) 10-yr) Major (100-yr) 10-yr) Major (100-yr) 10-yr) Major (100-yr) Minor (2- and 10- Major (100-yr) Surface Type Coe�cients� Area (sf) Composite C� Composite C' Area (sf) Composite C� Composite C' Area (sf) Composite C� Composite C' Area (sf) Composite C� Composite C' Area (sf) yr) Composite C� Composite C� Hardscape or Hard Surface Asphalt, Concrete 0.95 0 220 6,523 0 705 Rooftop 0.95 0 4,470 5,760 507 3,075 Gravel 0.50 0 6,144 3,870 310 0 Total Impervious Area 0 10,834 16,153 817 3,780 Landscape or Pervious Surface Lawns, Clayey Soil, Avg Slope 2-7% 0.25 16,414 97,586 94p51 12,439 7,692 Total Drainage Basin A 16,414 OZS 031 108,420 0.29 037 110,204 034 0.42 13,256 0.28 035 11,472 0.48 0.60 Notes: 1. Runoff coefficients per Fort Collins Stormwater Criteria Manual Table 31-2. 2. Composite runoff coefficient per Fort Collins Stormwater Criteria Manual Equation 5-1. 3. Frequency adjustment factor per Fort Collins Stormwater Criteria Manual Ta61e 3.2-3. Table 3.2-3. Frequency Adjustment Factors Storm Return Period Frequency Adjustment (years) Factor(G) 2, 5, 10 1.00 25 1.10 50 1.20 100 1.25 Pearson - drainage.xlsx Drainage Basin Runoff Calculations 5206 Fossil Creek Drive, Fort Collins, CO Area Minor Major Initial/Overland Timel Travel TimeZ Final T� Intensity (in/hr)° Basin Flow (cfs)5 Basin Length Slope Minor to Major to Length Slope Channel Velocity t� Minor Tc Major Tc (acres) Composite C Composite C 2-yr 10-yr 100-yr 2-yr 10-yr 100-yr (ft) (%) (min) (min) (ft) (%) Type (fps) (min) (min) (min) Historic A 0.377 0.25 0.31 100 5 9.3 8.6 NA 9.3 8.6 2.30 3.93 8.38 0.22 0.37 0.99 B 2.489 0.29 0.37 400 4 19.0 17.3 260 1% swale 1.50 2.89 21.9 20.1 1.56 2.67 5.60 0.15 0.25 5.13 C 0.377 0.28 0.35 150 2 14.9 13.6 NA 14.9 13.6 1.92 3.29 6.92 0.18 0.31 0.92 Developed A 0.377 0.25 0.31 100 5 9.3 8.6 NA 9.3 8.6 2.30 3.93 8.38 0.22 0.37 0.99 B 2.530 0.34 0.42 400 4 18.0 16.0 260 1% swale 1.50 2.89 20.9 18.9 1.61 2.74 5.92 0.15 0.26 6.31 C 0.263 0.48 0.60 150 2 11.3 9.1 NA 11.3 9.1 2.13 3.63 8.03 0.20 0.34 1.27 Notes: 1. Per Fort Collins Stormwater Criteria Manual Section 3.3.2. i.s�(i.i-cXcr)� T' 3� Where: C= Runoff Coefficient, dimensionless Cr = Frequency Adjustment Factor, dimensionless L= Length of Overland Flow, feet S = Slope, percent 2. Per Fort Collins Stormwater Criteria Manual Section 3.3.3. V _ �.ae Rz/ssi/2 n Where: V = Velocity, feet/second n = Roughness Coefficient, dimensionless R= Hydraulic Radius, feet (Hydraulic Radius = area / wetted perimeter, feet) S = Longitudinal Slope, feet/feet And: L T� - vx6o 3. Per Fort Collins Stormwater Criteria Manual Section 3.3.4. A minimum T� of 5 minutes is required. T�-ieo+10 4. Per IDF Table for Rational Method, Table 3.4-1 Fort Collins Stormwater Criteria Manual. 5. Per Fort Collins Stormwater Criteria Manual Equation 5-1. Q = CIA Where: Q= Peak Rate of Runoff, cfs C = Runoff Coefficient, dimensionless I = Rainfall Intensity, in/hr A= Area of the Basin or Sub-basin, acres Pearson - drainage.xlsx Concrete Washout Area (CWA) ■ 12" TYP >4 1� MM-1 CWA VEHICLE TRACKING CONTROL (SEE VTC DETAIL) OR OTHER STABLE SURFACE 2% SLOPE --� — — 1� �3� MIN. �� UNDISTl1RBED OR� >3 >3 COMPACTED SOIL VEHICLE TRACKING 8 X 8 MIN. CONTROL (SEE VTC SECTION A DETAIL � CWA-1 . CONCRETE WASHOUT AREA CWA INSTALLSTION NOTES 1. SEE PLAN VIEW FOR: -CWA WSTALLATION LOCATION. 2. DO NOT LOCATE AN UNLINED CWA WITHIN 400' OF ANY NATURAL DRAINAGE PATHWAY OR WATERBODY. DO NOT LOCATE WITHIN i,000' OF ANY WELLS OR DRINKING WATER SOURCES. IF SITE CONSTRAINTS MAKE THIS INFEASIBLE, OR IF HIGHLY PERMEABLE SOILS EXIST ON SITE, THE CWA MUST BE INSTALLED WITH AN IMPERMEABLE LINER (16 MIL MIN. THICKNESS) OR SURFACE STORAGE ALTERNATIVES USING PREFABRICATED CONCRETE WASHOUT DEVICES aR A LINEO A80VE GROUNO STORAGE ARE SHOULD BE USED. 3. THE CWA SHALL BE INSTALLED PRIOR TO CONCRETE PLACEMENT ON SITE. 4. CWA SHALL INCLUOE A FLAT SU6SURFACE PIT THAT IS AT LEAST 8' BY 8' SLOPES LEADING OUT OF THE 5UBSURFACE PIT SHALL BE 3:1 OR FLATTER. THE PIT SHALL BE AT LEAST 3' DEEP. 5. 6ERM SURR�UNOING SIDES AND BACK OF THE CWA SHALL HAVE MINIMUM HEIGHT OF 1'. 6. VEHICLE TRACKING PAD SHALL BE SLaPED 2� TOWARDS THE CWA. 7. SIGNS SHALL BE PLACED AT THE CONSTRUCTION ENTRANCE, AT THE CWA, AND ELSEWHERE AS NECESSARY TO CLEARLY INDICATE THE LOCATION OF THE CWA TO OPERATORS OF CONCRETE TRUCKS AND PUMP RIGS. 8. USE EXCAVATED MATERIAL FaR PERIMETER BERM CONSTRUCTION. November 2010 Urban Drainage and Flood Control District CWA-3 Urban Storm Drainage Criteria Manual Volume 3 CONCRETE WASHOUT AREA PLAN � COMPACTED BERM AROUND � iHE PERIMETER MM-1 Concrete Washout Area (CWA) CWA MAINTENANCE NOTES 1. INSPECT BMPs EACH WORKDAY, AND MAINTAIN THEM IN EFFECTIVE OPERATING CONDITION. MAINTENANCE OF BMPs SHQULD BE PROACTIVE, NOT REACTIVE. INSPECT BMPs AS SOON AS POSSIBLE (AND ALWAYS WITHIN 24 HOURS) FOLLOWING A STORM THAT CAUSES SURFACE ERQSION, AND PERFORM NECESSARY MA�NTENANCE. 2. FREQUENT OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN BMPS IN EFFECTIVE OPERATING CONDITION. INSPECTIONS ANO CORRECTIVE MEASURES SHOULD BE DOCUMENTED THOROUGHLY. 3. WHERE BMPs HAVE FAILED, REPAIR OR REPLACEMENT SHOULO BE INITIATED UPON DISCOVERY OF THE FAILURE. 4. THE CWA SHALL BE REPAIRED, CLEANED, OR ENLARGED AS NECESSARY TO MAINTAIN CAPACITY FOR CONCRETE WASTE. CONCRETE MATERIALS, ACCUMULATED IN PIT, SHALL 8E REMOVED ONCE THE MATERIALS HAVE REACHED A DEPTH OF 2'. 5. CONCRE7E WASHOUT WATER, WASTED PIECES OF CONCRETE AND ALL OTHER DEBRIS IN THE SUBSURFACE PIT SHALL BE TRANSPORTED FROM THE JOB SITE IN A WATER—TIGHT CONTAINER AND DISPOSED OF PROPERLY. 6. THE CWA SHALL REMAIN IN PLACE UNTIL ALL CONCRETE FOR THE PROJECT 15 PLACED. 7. WHEN THE CWA IS REMOVED, COVER THE DISTURBE� AREA WITH 70P SOIL, SEED ANO MULCH OR OTHERWISE STABILIZED IN A MANNER APPROVED 8Y THE LOCAL JURISDICTION. (DETAIL ADAPTEO FROM OOUGLAS COUNN, COLORA00 AND THE CITY af PARKER, COLORA00, NOT AVAlLABLE IN AUTOCAD). NOTE: MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UOFCO STANDARO DETAILS. CONSULT WITH LOCAL JURISDICTIONS AS TO WHICH DETAIL SHOULD BE USED WHEN DIFFERENCES ARE NOTED. CWA-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Silt Fence (SF) SF - SF - SF SILT FE� GEOTEXT COMPACI BACKF F� W -�� EXISTING � � ' GROUND fi�� MI� AT LEAST 10" OF SILT FENCE "TAIL" SHALL BE BURIED lY2"X lY2" (RECaMMENDED) WOODEN �ENCE POST WITH 10' MAX iPACING 36 -48" - TYP� SILT FENCE JOIN FIRST SC-1 SF POSTS SHALL OVERLAP AT JOINTS SO THAT NO GAPS EXIST IN SILT FENCE ROTATE SECOND POSTS SHALL BE JOINEO AS SHOWN, THEN ROTATED 180 DEG. THICKNESS OF GEOTEXTILE HAS IN OIRECTION SHaWN AND DRIVEN BEEN EXAGGERATEO, TYP INTO THE GROUND SECTION A SF-1. SILT FENCE November 2010 Urban Drainage and Flood Control District SF-3 Urban Storm Drainage Criteria Manual Volume 3 SC-1 Silt Fence (SF) SILT FENCE INSTALLATION NaTES 1. SILT FENCE MUST BE PLACED AWAY FROM THE TOE OF THE SLOPE TO ALLOW FOR WATER PONDING. SILT FENCE AT THE TOE OF A SLOPE SHOULD 8E INSTALLED IN A FLAT LOCATION AT LEAST SEVERAL FEET (2-5 FT) FROM THE TOE OF THE SLOPE TO ALLOW ROOM FOR PONDING AND DEPOSITION. 2. A UNIFORM fi" X 4" ANCHOR TRENCH SHALL BE EXCAVATED USING TRENCHER OR SILT FENCE INSTALLATION DEVICE. NO ROAD GRADERS, BACKHOES, OR SIMILAR EQUIPMENT SHALL BE USEO. 3. COMPACT ANCHOR TRENCH BY HAND WITH A"JUMPING JACK" OR BY WHEEL ROLLING. COMPACTIaN SHALL BE SUCH THAT SILT fENCE RESISTS BEING PULLED OUT OF ANCHOR TRENCH 8Y HAND. 4. SILT FENCE SHALL BE PULLED TIGHT AS IT IS ANCHORED TO THE STAKES. THERE SHOULD BE NO NOTICEABLE SAG BETWEEN STAKES AFTER IT HAS BEEN ANCHORED TO THE STAKES. 5. SILT FENCE FABRIC SHALL BE ANCHOREO TO THE STAKES USING 1" HEAVY DUTY STAPLES OR NAILS WITH 1�� HEAOS. STAPLES AND NAILS SHOULO BE PLACEO 3�� ALONG THE FABRIC DOWN THE STAKE. 6. AT THE END OF A RUN OF SILT FENCE ALONG A CONTOUR, THE SILT FENCE SHOULD BE TURNED PERPENDICULAR TO THE CONTOUR TO CREATE A��J—HOOK.'� THE "J—HOOK" ExTENDING PERPENDICULAR TO THE CONTOUR SHOULD BE OF SUFfICIENT LENGTH TO KEEP RUNaFF FROM FLOWING AROUND THE END OF THE SILT FENCE (TYPICALLY 10' — 20'). 7. SILT FENCE SHALL BE INSTALLED PRIOR TO ANY LAND OISTURBING ACTIVITIES. SILT FENCE MAINTENANCE NOTES 1. INSPECT BMPs EACH WORKDAY, AND MAINTAIN THEM IN EFFECTIVE OPERATING CONDITION. MAINTENANCE OF BMPs SHOULD BE PROACTIVE, NOT REACTIVE. WSPECT BMPs AS SOON AS POSSIBLE (AND ALWAYS WITHIN 24 HOURS) FOLLOWING A STORM THAT CAUSES SURFACE EROSION, AND PERFORM NECESSARY MAINTENANCE. 2. FREQUENT OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN BMPs IN EFFECTIVE OPERATING CONDITION. INSPECTIONS AND CORRECTIVE MEASURES SHOULD BE DOCUMENTED THOROUGHLY. 3. WHERE BMPs HAVE FAILED, REPAIR OR REPLACEMENT SHOULD BE INITIATED UPON DISCOVERY OF THE FAILURE. 4. SEDIMENT ACCUMULATED UPSTREAM OF THE SILT FENCE SHALL BE REMOVED AS NEEDED TO MAINTAIN THE FUNCTIONALITY OF THE BMP, TYPICALLY WHEN DEPTH OF ACCUMULATED SEDIMENTS IS APPROXIMATELY 6". 5. REPAIR OR REPLACE SILT FENCE WHEN THERE ARE SIGNS OF WEAR, SUCH AS SAGGING, TEARING, OR COLLAPSE. 6. SILT FENCE IS TO REMAIN IN PLACE UNTIL THE UPSTREAM DISTURBED AREA IS STABILIZED AND APPROVED BY THE LOCAL JURIS�ICTION, OR IS REPLACEO 6Y AN EQUIVALENT PERIMETER SEDIMENT CONTROL 6MP. 7. WHEN SILT FENCE IS REMOVEO, ALL DISTURBED AREAS SHALL BE COVERED WITH TOPSOIL, SEEDED AND MULCHED OR OTHERWISE STABILIZEO AS APPROVED BY LOCAL JURISDICTION. (DETPJL PAAPTED FROM TOWN OF PARKER, COLORADO AND CITf OF AURORA, NOT AVAILABLE IN AUTOCAD) NOTE: MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UDFCD STANDARD DETAILS. CONSULT WITH LOCAL JURISOICTIONS AS TO WHICH DETAIL SHOULD BE USED WHEN OIFfERENCES ARE NOTED. SF-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Stockpile Management (SP) MM-2 �# �� . J . .�•� � / � / \ � \ ` � \ � �— 1 SP / �` � � SILT FENCE (SEE SF DETAIL FOR / INSTALLATION RE4UIREMENTS) � STOCKPILE PROTECTION PLAN MAXIMUM ��/ SILT FENCE (SEE SF DETAIL FOR INSTALLATION REQUIREMENTS) SECTION A SP-1 . STOCKPILE PROTECTION STOCKPILE PROTECTION INSTALLATION NOTES 1. SEE PLAN VIEW FOR: -LOCATION OF STOCKPILES. -TYPE �F STOCKPILE PROTECTION. 2. INSTALL PERIMETER CONTROLS IN ACCOROANCE WITH THEIR RESPECTIVE DESIGN DETAILS. SILT FENCE IS SHOWN IN THE STOCKPILE PROTECTION DETAILS; HOWEVER, OTHER TYPES OF PERIMETER CONTROLS INCLUDING SEDIMENT CONTROL LOGS OR ROCK SOCKS MAY BE SUITABLE IN SOME CIRCUMSTANCES. CONSI�ERATIONS F�R DETERMINING THE APPROPRIATE NPE OF PERIMETER CONTROL FOR A STOCKPILE INCLUDE WHETHER THE STOCKPILE IS LOCATED ON A PERVIOUS OR IMPERVIOUS SURFACE, THE RELATIVE HEIGHTS OF THE PERIMETER CONTROL AND STOCKPILE, THE ABILIN OF THE PERIMETER CaNTROL TO CONTAIN THE STOCKPILE WITHOUT FAILING IN THE EVENT THAT MATERIAL FROM THE STOCKPILE SHIFTS OR SLUMPS AGAINST THE PERIMETER, ANO OTHER FACTaRS. 3. STA8ILIZE THE STOCKPILE SURFACE WITH SURFACE ROUGHENING, TEMPORARY SEEDING AND MULCHING, EROSION CONTROL BLANKEfS, OR SOIL BINOERS. SOILS STOCKPILED FOR AN EXTENOED PERIOD (TYPICALLY FOR MORE THAN 60 aAYS) SHQULD BE 5EEaED ANO MULCHED WITH A TEMPORARY GRASS COVER ONCE THE STOCKPILE IS PLACED (TYPICALLY WITHIN 14 DAYS). USE OF MULCH ONLY OR A SOIL BINDER IS ACCEPTABLE IF THE STOCKPILE WILL BE IN PLACE FOR A MORE LIMITED TIME PERIOD (TYPICALLY 30-6fl DAYS). 4. FOR TEMPORARY STOCKPILES ON THE INTERIOR PORTION OF A CONSTRUCTION SITE, WHERE OTHER OOWNGRADIENT CONTROLS, INCLUOING PERIMETER CONTROL, ARE IN PLACE, STOCKPILE PERIMETER CONTROLS MAY NOT BE REQUIREO. November 2010 Urban Drainage and Flood Control District SP-3 Urban Starm Drainage Criteria Manual Volume 3 MM-2 Stockpile Management (SM) STOCKPILE PROTECTION MAINTENANCE NOTES 1. INSPECT BMPs EACH WORKDAY, AND MAINTAIN THEM IN EFFECTIVE OPERATING CONDITION. MAINTENANCE OF BMPs SHQULD BE PROACTIVE, NOT REACTIVE. INSPECT BMPs AS SOON AS POSSIBLE (AND ALWAYS WITHIN 24 HOURS) FOLLOWING A STORM THAT CAUSES SURFACE ERQSION, AND PERFORM NECESSARY MA�NTENANCE. 2. FREQUENT OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN BMPS IN EFFECTIVE OPERATING CONDITION. INSPECTIONS ANO CORRECTIVE MEASURES SHOULD BE DOCUMENTED THOROUGHLY. 3. WHERE BMPs HAVE FAILED, REPAIR OR REPLACEMENT SHOULD BE INITIATED UPON DISCOVERY OF THE FAILURE. STOCKPILE PROTECTION MAINTENANCE NOTES 4. IF PERIMETER PROTECTION MUST BE MOVED TO ACCESS SOIL STOCKPILE, REPLACE PERIMETER CONTROLS BY THE ENQ aF THE WORKDAY. 5. STOCKPILE PERIMETER CONTROLS CAN BE REMOVED ONCE ALL THE MATERIAL FROM THE STOCKPILE HAS BEEN USED. (DETNLS ADAPfEO FROM PARKER, COLORADO, NOT AVNLABLE IN AUTOCAD) NOTE: MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UDFCD STANDARD DETAILS. CONSULT WITH LOCAL JURISDICTIONS AS TO WHICH OETAIL SHOULO BE USED WHEN DIFFERENCES ARE NOTED. SP-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Vehicle Tracking Control (VTC) SM-4 �� a t S� 't ��f . 7,.�c T�-i`y-i,_I VTC 20 FOOT (WIDTH CAN BE LESS IF CONST. VEHICLES ARE PHYSICALLY CONFINED ON BOTH SIDES) SIDEWALK OR QTHER 50 FOOT lMIN.I 9" (MIN.) UNLESS OTHERWISE SPECIFIED BY LOCAL JURISOICTION, USE COOT SECT. Jj703, AASHTO j{3 COARSE AGGREGATE OR 6" MINUS ROCK INSTALL ROCK FLUSH WITH aR BELaW TOP OF PAVEMENT NON-WOVEN GEQTEXTILE FABRIC BETWEEN SOIL AND ROCK UNLESS OTHERWISE SPECIFIED BY LOCAL JURISOICTION, USE CDOT SECT. #703, AASHTO �f3 COARSE AGGREGATE OR 6�� MINUS ROCK r 9�� (MIN.) � i�ii��ii\� � ��i`��;��`��%�?�T��i�;��i�T��`��,� ��`� I ` ��i � �� y�� y�� NON-WOVEN GEOTEXTILE FABRIC COMPACTED SUBGRAOE J SECTION A VTC-1 . AGGREGATE VEHICLE TRACKING CONTROL November 2010 Urban Drainage and Flood Control District VTC-3 Urban Storm Drainage Criteria Manual Volume 3 SM-4 Vehicle Tracking Control (VTC) SiABILIZED CONSTRUCTION ENiRANCE/EXIT INSTALLATION NOTES 1. SEE PLAN VIEW FOR -LaCATION OF CONSTRUCTIaN ENTRANCE(S)/EXIT(S). -TYPE OF CONSTRUCTION ENTRANCE(S)/EXITS(S) (WITH/WITHOUT WHEE� WASH, CONSTRUCTION MAT OR TRM). 2. CONSTRUCTION MAT OR 7RM STABILIZED CONSTRUCTION ENTRANCES ARE ONLY TO 8E USED ON SHORT DURATION PROJECTS (TYPICALLY RANGING FROM A WEEK TO A MONTH) WHERE THERE WILL BE LIMITED VEHICULAR ACCESS. 3. A STABILIZED CONSTRUCTION ENTRANCE/EXIT SHALL BE LOCATED AT ALL ACCESS POINTS WHERE VEHICLES ACCESS THE CONSTRUCTION SITE FROM PAVED RIGHT-OF-WAYS. 4. STA8ILIZED CONSTRUCTION ENTRANCE/EXIT SHALL BE INSTALLED PRIOR TO ANY LAND DISTURBING ACTIVITIES. 5. A NaN-WOVEN GEOTEXTILE FABRIC SHALL BE PLACED UNDER THE STABILIZED CONSTRUCTION ENTRANCE/EXIT PRIOR TO THE PLACEMENT OF ROCK. 6. UNLESS OTHERWISE SPECIFIED BY LOCAL JURISDICTION, ROCK SHALL CONSIST OF DOT SECT. #703, AASHTO �3 COARSE AGGREGATE �R 6" (MINUS) ROCK. STABIUZED CONSTRUCTION ENTRANCEfEXIT MAINTENANCE NOTES 1. INSPECT BMPs EACH WORKDAY, AND MAINTAIN THEM IN EFFECTIVE OPERATING CONDITION. MAINTENANCE OF BMPs SHQULD BE PROACTIVE, NOT REACTIVE. INSPECT BMPs AS SOON AS POS518LE (AND ALWAYS WITHIN 24 HOURS� FOLLOWING A STORM THAT CAUSES SURFACE ERaS10N, AND PERFQRM NECESSARY MAINTENANCE. 2. FREQUENT OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN BMPs IN EFFECTIVE OPERATING CONDITION. INSPECTIONS AND CORRECTIVE MEASURES SHOULD BE DOCUMENTED THOROUGHLY. 3. WHERE BMPs HAVE FAILED, REPAIR OR REPLACEMENT SHOULD BE INITIATED UPON DISCOVERY OF THE FAILURE. 4. ROCK SHALL BE REAPPLIED OR REGRAOED AS NECESSARY TO THE STABILIZED ENTRANCE/EXIT TO MAINTAIN A CONSISTENT DEPTH. 5. SEDIMENT TRACKED ONTO PAVED ROA�S IS TO BE REMOVED THROUGHOUT THE DAY AND AT THE END OF THE DAY BY SHOVELING OR SWEEPING, SEDIMENT MAY NOT BE WASHED DOWN STORM SEWER ORAINS. NOTE: MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UOFCD STANDARD DETAILS. CONSULT WITH LOCAL JURISDICTIONS AS TO WHICH DETAIL SHOULD BE USED WHEN DIFFERENCES ARE NOTED. (DETNLS ADAPlEO FRQM CI1Y OF BROOMFIELO, COLORADO, NOT AVNLABLE IN AUTOCAD) VTC-6 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Rock Sock (RS) Description A rock sock is constructed of gravel that has been wrapped by wire mesh or a geotextile to form an elongated cylindrical filter. Rock socks are typically used either as a perimeter control or as part of inlet protection. When placed at angles in the curb ]ine, rock socks are typically referred to as curb socks. Rock socks are intended to trap sediment from stormwater runoff that flows onto roadways as a result of construction activities. Appropriate Uses � r__� :{:� �� SC-5 Photograph RS-l. Rock socks placed at regular intervals in a curb Rock Socks can be used at tl]e perimeter line can help reduce sediment loading to storm sewer inlets. Rock of a disturbed area to control localized socks can also be used as perimeter controls. sediment loading. A benefit of rock socks as opposed to other perimeter controls is that they do not have to be trenched or staked into the ground; therefare, they are often used on roadway construction projects where paved surfaces are present. Use rock socks in inlet protection applications when the construction of a roadway is substantially complete and the roadway has been directly connected to a receiving storm system. Design and Installation When rock socks are used as perimeter controls, the maximum recommended tributary drainage area per 1001ineal feet of rock socks is approximately 0.25 acres with disturbed slope length of up to 150 feet and a tributary slope gradient no steeper than 3:1. A rock sock design detail and notes are provided in Detail RS-1. Also see the Inlet Protection Fact Sheet for design and installation guidance when rock socks are used for inlet protection and in the curb line. When placed in the gutter adjacent to a curb, rocic socks should protrude no more than two feet from the curb in order for traffic to pass safely. If located in a high traffic area, place construction markers to alert drivers and street maintenance workers of their presence. Maintenance and Removal Rock socks are susceptible to displacement and breaking due to vehicle traffic. Inspect rock socks for damage and repair or replace as necessary. Remove sediment by sweeping or vacuuming as needed to maintain the functionality of the BMP, rypically when sediment has accumulated behind the rock sock to one-half of the sock's Rock Sock height. F Once upstream stabilization is complete, rock socks and accumulated sediment should be removed and properly disposed. unchons Erosion Control No Sediment Control Yes Site/Material Mana ement No November 2010 Urban Drainage and Flood Control District RS-1 Urban Starm Drainage Criteria Manual Volume 3 SC-5 �� lY�° (MINUS) CRUSHED ROCK :LOSEO IN WIRE MESH WIRE TIE ENOS --� � 0" ON BEOROCK OR � HARO SURFACE, 2" IN SOIL `- GROUND SURFACE ROCK SOCK SECTION Rock Sock (RS) RS 1Y2" {MINUS) CRUSHED ROCK ENCLOSED IN WIRE MESH 4" TO 6" MAX AT CURBS, OTHERWISE 6"-10" DEPENDING ON EXPECTEO SEDIMENT LOADS ROCK SOCK PLAN ANY GAP AT JOINT SHALL BE FILLED WITH AN AOEQUATE AMOUNT OF 1}�" (MINUS) CRUSHED ROCK ANO WRAPPEO WITH ADDITIONAL wIRE MESH SECURED TO ENDS OF ROCK ROCK SOCK, REINFORCED SOCK. AS AN ALTERNATIVE TO FILLING JOINTS n'P BETWEEN ADJOINING ROCK SOCKS wITH CRUSHED ROCK AND 12" 12" ADDITIONAL WIRE WRAPPING, ROCK SOCKS CAN BE OVERLAPPED (TYPICALLY 12-INCH OVERLAP) TQ AV010 GAPS. �.� .'�s'�„� ROCK SOCK JOINTING ROCK SOCK INSTALLATION NOTES 1. SEE PLAN VIEW FOR: -LOCATION(S) OF ROCK SOCKS. GRADATION TABLE SIEVE SIZE MASS PERCENT PASSING SQUARE MESH SIEVES N0. 4 2 100 �1�z�� 90 - 100 1 �� 20 - 55 '/4" 0 - i 5 3,�" 0 - 5 MATCHES SPECIFICATIONS FOR N0. 4 COARSE AGGREGATE FOR CONCRETE PER AASHTO M43. ALL ROCK SHALL BE FRACTUREO FACE, ALL SIDES. 2. CRUSHEO ROCK SHA�L BE lY2" (MINUS) IN SIZE WITH A FRACTURED fACE (ALL 51DE5) AND SHALL COMPLY WITH GRADATION SHOWN ON THIS SHEET {1}�" MINUS). 3. WIRE MESH SHA�L BE FABRICATED OF 10 GAGE POULTRY MESH, aR EQUIVALENT, WITH A MAXIMUM OPENING OF �", RECOMMENDED MINIMUM ROLL WIDTH OF 48" 4. WIRE MESH SHA�L BE SECURED USING "HOG RINGS" OR WIRE TIES AT 6'� CENTERS ALONG ALL JOINTS AND AT 2" CENTERS ON ENDS OF SOCKS. 5. SOME MUNICIPALITIES MAY ALLOW THE USE OF FILTER FABRIC AS AN ALTERNATIVE TO WIRE MESH FOR THE ROCK ENCLOSURE. RS-1 . ROCK SOCK PERIMETER CONTROL RS-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Rock Sock (RS) -. . u: ► .: ►• SC-5 1. INSPECT BMPs EACH WORKDAY, AND MAINTAIN THEM IN EFFECTIVE OPERATING CONDITION. MAINTENANCE OF BMPs SHaULD BE PROACTIVE, NOT REACTIVE. INSPECT BMPs AS SOON AS POSSIBLE (AND ALWAYS WITHIN 24 HOURS) FOLLOWING A STORM THAT CAUSES SURFACE ERaSION, AND PERFORM NECESSARY MAINTENANCE. 2. FREQUENT OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN BMPS IN EFFECTIVE OPERATING CONOITION. INSPECTIONS ANO CORRECTIVE MEASURES SHOULD BE DOCUMENTED THOROUGHLY. 3. WHERE BMPs HAVE FAI�ED, REPAIR OR REPLACEMENT SHOULD BE INITIATED UPON DISCOVERY OF THE FAILURE. 4. ROCK SOCKS SHALL BE REPLACED IF THEY BECOME HEAVILY SOILED, OR �AMAGED BEYOND REPAIR. 5. SEDIMENT ACCUMULATED UPSTREAM OF ROCK SOCKS SHALL BE REMOVED AS NEEDED TO MAINTAIN FUNCTIQNALITY OF THE BMP, TYPICALLY WHEN DEPTH OF ACCUMULATED SEDIMENTS IS APPROXIMATELY 1� OF THE HEIGHT OF THE ROCK SOCK. 6. ROCK SOCKS ARE TO REMAIN IN PLACE UNTIL THE UPSTREAM DISTURBED AREA IS STABILIZED AND APPROVED BY THE LOCAL JURISDICTION. 7. WHEN ROCK SOCKS ARE REMOVED, ALL �ISTURBED AREAS SHALL BE COVERED WITH TOPSOIL. SEEDED AND MULCHED OR OTHERWISE STABILIZED AS APPROVED BY LOCAL JURISDICTION. (DETAIL ADAPTED FRON TOWN OF PARKER, COLORADO AND Cltt OF AURORA, COLORADO, NOT AVAIU+BLE IN AUTaCAO) NOTE: MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UOFCD STANDARO �ETAILS. CONSULT WITH LOCAL JURISDICTIONS AS TO WHICH OETAIL SHOULD BE USED WHEN DIFFERENCES ARE NO7ED. NOTE: THE DETAILS INCLUDEO WITH THIS FACT SHEET SHOW COMMONLY USED, CONVENTIONAL METHODS OF ROCK SOCK INSTALLATION IN THE OENVER METROPOUTAN AREA. THERE ARE MANY OTHER SIMILAR PROPRIETARY PRODUCTS ON THE MARKEf. UDFCD NEITHER NDORSES NOR DISCOURaGES uSE OF PROPRiETARY PROTECTIaN PRODUCtS; HOwEVER, iN THE EVENT PROPRIETARY METHODS ARE USED, THE APPROPRIATE DETAIL FROM THE MANUFACTURER MUST BE INCLUDED IN THE SWMP AND THE BMP MUST BE INSTALLED AND MAINTAINED AS SHOWN IN THE MANUFACTURER'S DETAILS. November 2010 Urban Drainage and Flood Control District RS-3 Urban Starm Drainage Criteria Manual Volume 3 �` I � i' . � ��I �� +,, i�. illdY�i�►�� +,��[«. .� � � � ` ' �11 '? I 1 h i ,�' � '�� I I�. 71 � � . , � �, (..I��. i��r �s �'� rl � ?' ( / �� ,IJ' ��r'� � /� h ��j ♦ � ,V Ci �r / t ��k� �� t �i�l a �k ,� t � �I �� 1�V�jf ,11 � r b'�'=., { .. ` � . � �i „� � ! ,�y� i ,,� »�•� "��k �`��' � ��,�� R ' � \�` �'a �f� �. pE� � v �, � � �� +� ��,r+1� e� �,��" ��'` ,, ��"; _ "�� i ,. . 1 ii � t �.1 �. t �.A �: ,. �'�1 � , . ' - � � �t�, ,� ,,�''�, r �; � I , �_ x y i a� Y6 i L' �' j �I �F f'� rt�� K�� .� � �f ��'� � � i * �. ,�.�"� � 1 ' � �•�=�w �� r�' �•J� ;`: � �'�T. . y _ < ,� . �� ♦ � + �,♦ ► �\ r `�� iJ �'��,� � d.. %� ,i �'..�t ,"'a�"� , � �. ` , �, r�' , .. r��a � '� � • ,�� .�. i �tt! � � � � +�� , �G'`� '�► �► � Y. � r� • ��,, �- � '%',� � >yr �,i� �. J ! �^ f;':'� .!�+r �`"t''. � . ¢ r ��ii' .� .��' Native plants are sustainable, low maintenance, and create a beautiful habitat for insects and pollinators. Grasses such as smooth brome, crested wheatgrass, and intermediate wheat are exotic plants. They are aggressive, form monocultures, and don't provide good habitat to native pollinators and other wildlife. The City of Fort Collins Natural Areas Department has 15 years of experience developing and testing a variety of native seed mixes. Many of these species have been used in successful large-scale restoration projects. These mixes are carefully planned to provide landscapers, contractors, and private citizens grasses and wildflowers that thrive in our climate. The mixes are custom blend- ed for the Fort Collins Growth Management Area at elevations of 4,800-5,660 feet. These native prairie plants are adapted to conditions in this area: • The seeds will germinate and establish in 1-3 growing seasons. If they do not, reseed the area. Get a head start on establishing your native seed. If there are areas that won't be re-disturbed during construction, go ahead and seed it. • Expect some bare soil between plants. • Expect plants to go dormant in hot, dry conditions—they will turn brown but are still alive. • Expect diversity in your plantings. The different native plants will grow commingled, instead of in isolated pockets of the same species grouped together. • Excessive grazing or continual disturbance will not allow plants to establish. �/ Plant during recommended dates. �/ Do not use fertilizer. ✓ Plant at proper depth. ✓ Do not irrigate. � � � � . � � �'.�r 6 �,.� e X "m��^" -,;e&r�� '�'. �` . t "�+' �r�� y�c .,-„� 4 ��,� i1 r `-�. � � �4� � �� "'a4` r _ r �} �1� "� ~�� . � '� .�; + _ � � w� � G =; �,. '� °� �{• � ��.,1 � d �"�1 7��n t +G1=y. _:� CUSTOM NATIVE SEED MIXES Native wildflowers and grasses provide larval food, nesting sites, pollen, and nec- tar for our native pollinators. Many of our native bee populations are declining. Each of these seed mixes was created with native pollinators in mind. UPLAND MIX . All soil types • Area is dry majority of growing season $154-$204/ac. MESIC MIX . All soil types • Area is periodically moist during growing season $220-$360/ac. WETLAND MIX • All soil types . Area is saturated to 6 inches of standing water for the ma- jority of the growing season $345-$685/ac. ALKALINE MIX • Soils with a presence of white mineral deposits on surface or in proximity . Area dry to saturated for the majority of the growing season $200-$270/ac. DETENTION BASIN MIX . All soil types (blend of Up- land and Mesic) • Low height requires less mowing $145-$225/ac. Prices may vary due to availability. ✓ Carefully monitor use of herbicides. ✓ Do not mow during hot, dry conditions. �� iq� ��1�� '� . , -.. �`�.'�. �. i �y� �� i� i �� 'ti,• . 9<� _ . ; � I-' A ir,'•. .\ � �_ � � ;��y r+e'ic � � - � � �'� � �j ; _ � � !i �. d� +� iJ' d +_.. -;—..� 1�°' � ��"i ' , �` _. �`� �= ��w� _ � . �� y , _ , � ��, � -�� , r__�:� � y � � s C,�i � i �� ,1` �, � �t ��f �s � ��t • �� %i� � �� '�.� � �i I SELECT NATIVE SEED MIX Choose a pre-formulated native seed mix (see previous page) based on your site conditions. � MEASURE, CALCULATE, AND ORDER �- Measure the square footage and calculate how much seed you need to purchase. Select a native seed company and let them know which of these native seed mixes you require. They may be able to assist with calculating how much seed you need. PREPARE SEED BED It's important for seeds to have good contact with the soil. Eliminate weeds or other vegetation that might impede soil contact. The soil should be firm. Compacted soil doesn't allow the seed to be placed into the soil; flufly soil may allow the seed to be planted too deep. There is no need to fertilize. Native plants have evolved with our low-nutrient soils. Fertilizer will benefit non-native weeds more than native plants. O SEEDING Plant seed on dry, bare ground from late October through early May. Seeds may be planted using a rangeland seed drill or by hand-broadcasting. If using a seed drill, it is best to plant perpendicular on slopes. This will aid in erosion control. Make sure the top inch of soil is not frozen. Plant seed between'/a -% inch deep. Native plants need sunlight to germinate, so planting deeper may inhibit growth. If using the broadcast method, li�htly rake the area, evenly spread the seed, and tightly rake the seed in. You want to ensure good seed-to-soil contact, so be careful not to bury the seed or cluster it into uneven patterns. MAINTENANCE Depending on your site requirements, you may need mulch, hydromulch, or an erosion control mat. Most sites will benefit when protected by placement of one of these. There is no need to irrigate. NatNe plants have evolved with our precipitation events. Irrigation will benefit non-native weeds more than natNe plants and will set back the estab- lishment period of native seeds. Weed control, especially noxious weeds, is important during establishment. Hand pull or spot spray weeds with an herbicide. This helps to limit the amount of herbicide put into the environment and allows the native wildflowers to establish. Mowing can be beneficial to the establishment of your native seed. Make sure not to mow when conditions are dry and hot. Try not to mow more than once or twice a growing sea- son; any more may stress plants that are trying to establish. It will benefit your project if you allow the plants to flower and seed prior to mowing. �� .r L�� -�' _ T '_T �; �,� Seed Companies Arkansas Valley (Denver} www.ayseeds.com/ 1-877-907-3337 Granite Seed (Denver) www.�raniteseed.com/ 1-888-577-565Q Pawnee Buttes Seed (Greeley} www.pawneebuttesseed.com/ 1-800-782-5947 Western Native Seed (Salida) www.westernnativeseed.com/ (719) 942-3935 Sharp Bros. Seed (Greeley) www.sharpseed.com/ (970) 356-4710 Seed Installation Custom Services of Colorado markbucklev5619C��mail.com (303) 775-0505 Native Seeders kate(a�nativeseederscompanv.com (970) 686-5121, c (970)217-9390 Habitat Management Inc. habitatmanagementinc.com/ (303)770-9788 Larimer County Contractor list larimer.org/weeds/ commapplicators.htm For more information: Native Plant Revegetation Gulde for Colorado: https://cpw.state.co.us/Documents/ CNAP/ReveqetationGuide.pdf � _�: �i�� L;��^ :�* �� ,� � � I, � � � � � :� � � � � -. � � � 5 �� - 4 � 4 � i i. UPLAND MIX Common Name Scientific Name ]bs/PLS/Acre Plains coreopsis Coreo��sis tinc,toria 0.17 �Ptu•ple prairie clover Dc�len pnrp�u�ea 0.81 � '� Indian blanketflower Gnillardia aristata 1.£35 0 � � Rocky. Mtn. pensteinon Penste�7�on strictlis 0.35 � Mexican hat Ratibidn c,oll��nnifern O.Z Indian ricegrass Achnatllerliin hylneiloicles 1.13 Sideoats grama Bouteloua curti�endula 1.15 Buffalograss Bouteloua clactyloides 3.27 Blue grama Bouteloua gracilis 0.25 wBottlebriish squirreltail ElJnnlis elymo�cles 0.95 � � Prairie Junegrass Koe,leria macralltha 0.08 Gre�n needlegrass Nassella viric�ula 1.01 Switchgrass Pnniculn virjntuln 0.71 Western wheat Pasc,opyrum smithii 1.61 Sand dropseed Sporobolus cry��tandrus 0.04 Total for Upland Mix 13.58 lbs/PLS/Acre ACCEPTABLE SUBSTITUTES FOR WILDFLOWERS Fringed sage (Artenlisia frigid�) 0.03 Ibs/PLS/Acre �, Blue flax (Lininn IeinrisiiJ 0.41 Ibs/PI S/Acre � Q' Prairie aster (Mac��aeranthern tanaeeV�ifolicr) 0.25 l�s/PLS/Acre � � � ACCEPTABLE SUBSTITUTES FOR GRASSES � � �' Canada wildrye (Ely�lius canadensis) 1.59 Ibs/PLS/Acre Tnlancl saltgrass (Distichlis stric,ta) 0.35 Ibs/PLS/t�cre Mountain inuhly (Mu111enbei�ia montanaJ 0.11 Ibs/PLS/Ac.re m `Contractor is responsible for locating and purchasing all species listed in mix. If a species can't be located, contractor must replace each missing species '� with the acceptable substitutions (listetl above). Contractor is responsible for providing seed tags to appropriate City stafi, if required for project. This mix �' is based on 70 seetls/ square foot and is only calculatetl for one acre. This mix is based on the contractor using a drill seed application. Mix shoultl be dou- ,� bled if hand broadcastetl. Contractor is responsible for calculating the appropriate seed amounts to purchase. Please note that the pountls per acre are in � PLS (Pure Live Seed) and must be orderetl that way. All materials furnished shall be free of Colorado State noxious weetls as tlef ned in Article III, Section � 21-40 of the Code of the City of Fort Collins. � �} � _�: �i�� L;��^ :�* �� ,� � � I, � � � � � :� � � � � -. � � � 5 �� - 4 � 4 � i i. MESIC MIX Common Name Scientific Name lbs/PLS/ Acre Smooth aster 1�ster laevis 0.19 � While prairie clover Dalea ccrndidcr 0.65 � o Purple prairi� clover Dalecr purpui•ea O.B1 � y Indian blanketflowc;r Gnillnrdia aristatn 1.85 � Black-eyed Siisan Ruclbec,kia hi��ta 0.14 Big blu�s�t�in �lndropogon gerai�dii 1.3 Salt and pepper grass Deschampsia c,aespitosa 0.07 Inland saltgrass Distichlis str�cta 0.35 Streainbank wheatgrass Elymus lanceolntlis ssp. lanceolatus 1.36 wSwitchgrass Panic,lim vil�atlun 0.71 � � Western wheatgrass Pasco�yrtim smithii 1.61 F'owl bluegrass Pon palustris 0.18 Little hluestem Schiznchyriiun scopariuin 0.7 Yellow Indiangrass Sorghastruln rltitans 1.38 Prairie cordgrass Spa�°tina pectinata 1 Total for Mesic Mix 12.31 lbs/PLS/Acre ACCEPTABLE SUBSTITUTIONS FOR WILDFLOWERS Mexicail hai (Ratibic�a colurm�ifera) 0.10 Ihs/PLS/Acre �, Mv�sl� sunflower (Helianthi�s ��uttallii) 0.56 Ibs/F'LS/Acre � �'' Beebalm (Monarda fistulosa var. �nenthifolia) 0.09 ]hs/PI S/Acre � � ACCEPTl�BLE SUBSTITtITIONS FOR GRASSES � �' Anierican sloughgrass (�3eck�nannia syzi;achne) 0.20 1bs/PLS/Acre Alkali sacaton (Sporobollis airoidesJ 0.11 Ibs/PLS/Ac.re Prairie sandreed (Calamovilfn longifolia) 0.67 Ibs/PLS/�icre m *Contractor is responsible for locating and purchasing all species listed in mix. If a species can't be located, contractor must replace each missing species '� with the acceptable substitutions (listetl above). Contractor is responsible for providing seed tags to appropriate City stafl, if required for project. This mix �' is based on 70 seeds/ square foot and is only calculatetl for one acre. This mix is based on the contractor using a drill seed application. Mix shoultl be dou- ,� bled if hand broaticasted. Contractor is responsible for calculating the appropriate seed amounts to purchase. Please note that the pountls per acre are in � PLS (Pure Live Seed) and must be ordered that way. All materials furnished shall be free of Coloratlo State noxious weeds as tlef netl in Article III, Section � 21-40 of the Code of the City of Fort Collins. � �} � _�: �i�� L;��^ :�* �� ,� � � I, � � � � � :� � � � � -. � � � 5 �� - 4 � 4 � i i. WETLAND MIX Common Name Scientific Name lbs/PLS/ Acre � Marsh stinflower Heli�7nihus nutiallii 1.51 � Pennsylvania sma�-tweed Paly,�onum pe.r��sylvanicum (Persicaria pensylvcrnica) 3.13 0 � Goldenglow daisy Rt�dheckia all��la 1.3Fi ti �' Blue verbena Verbena hastata 0.2 American sloughgrass Beckma�u�in syzibachne 0.39 � Inland saltgrass D�stichlis stric,ta 0.67 w � Giant mannagrass Glyceria grm�dis 0.27 �' Fowl bluegrass Poa �alustris 0.35 Prairie cordgrass Spartina �ectinata 1.9 Spikerush Eleochm'�s palustris 0.42 � Arctic rush Jtincus balticus (J. arct�ciis) 0.03 � Harclstem biilrush Schoenoplectus acutus 0.65 � �� Alkali bulrusli Sr,irptls maritimtis (Bolboschoenus lilaritiintls) 1.14 � Common three-square Schoenoplectus pungens 0.65 Total for Wetland Mix 12.68 Ibs/PLS/Acre ACC�PTABLE SUBSTITUT�S FOP WILDFLOWERS Black-eyc;d Susan (Rudbeckia hirta) 0.1J ]l�s/PLS/Ac,re Beebalm (Moncn�da �istulosa var•. menthi folia) 0.23 1bs/PLS/Acre � If one or more species is un��vailablE;, dotible i}ie quaiiti�tyo ui� an avaiLable w�ilclllower (In �nix above). � ACC�PTABL� SUBSTITUTES la OR GRASSES � Salt and pepper grass (Deschampsia caespil�osaJ 0.14 /bs/PLS/Aci•e � � �' Swi1�chgrass (Panic,um vir�afuin) 1.35 Ibs/PLS/Acre Alkali sacaton (S�oroholus airoides) 0.20 Ibs/PLS/Ac.re ACCEPTABLE SUBSTITUTES TOR W�T SP�CIES If one or more species is unavailable, double the quantity of an available wet species (In mix above). � *Contractor is responsible for locating and purchasing all species listed in mix. If a species can't be locatetl, contractor must replace each missing species � with the acceptable substitutions (listed above). Contractor is responsible for providing seetl tags to appropriate City staffi, if required for project. This �' mix is based on 100 seetls/ square foot and is only calculated for one acre. This mix is based on the contractor using a broaticast seed application. Contrac- ,� tor is responsible for calculating the appropriate seetl amounts to purchase. Please note that the pounds per acre are in PLS (Pure Live Seed) and must � be ordered that way. All materials furnishetl shall be free of Colorado State noxious weeds as tlef netl in Article III, Section 21-40 of the Cotle of the City of � Fort Collins. � � �} � _�: �i�� L;��^ :�* �� ,� � � I, � � � � � :� � � � � -. � � � 5 �� - 4 � 4 � i i. ALKALINE MIX Common Name Scientific Name lbs/PLS/ Acre Fringed sage Arte,misia ti�igida 0.05 � Purple prairie clover Dalea purpin•ea 0.81 � ''� Anniial siinflower Helianthiis annul�s 4.13 0 S � Bluc t7ax Li�nur� lewisii 0.83 � Mexican hat Ratibidn c.olumnifera 0.2 Sideoats grama Bouteloiia c.lirt�pencliila 1.15 Buffalograss Bouteloua dac,tyloides 3.27 Blue gran7a Bouteloua gracilis 0.25 Inland saltgrass Distichlis stric,ta 0.35 wBottlebrush squirreltail Elylnus e1y17�oides 0.95 � � � Slender wheatgrass Elylnus tracllycaiilus 1.36 Giant mannagrass Glyceria grandis 0.14 Switchgrass Panicum virgattun 0.71 Western wheatgrass Pc�sco�yrur�l smitli�i 1.61 Alkali sacaton Sporoholus airoides 0.11 Total for Alkaline Mix 15.92 lbs/PLS/Acre ACC�PTABLE SUBSTITUTES FOR WILDFLOW�RS Indian blanketflower (Gaill�rrdia aristata) 1.85 Ibs/PLS/Acre �, Prairie aster (Machaercrn'tl�era tailacetifoli�r) 0.49 Ibs/PLS/Acre r � � Scarlet globemallow (Sphaeralcecr cor,c.ii�ea) 0.61 Ibs/PLS/Ac.re � � ACC�PTABLE SUBSTITUTES FOR GRASS�S � � �' Canada wildrye (Elymus r,anadensis) 1.G0 Lbs/PLS/Acre. Nuttall's alkaligrass (Pl�cc.illellia airoidesJ 0.15 Ibs/PLS/Acre Prairi� cordgrass (Spai•tina pectinataJ 1.00 Ibs/PLS/Acre � *Contractor is responsible for locating and purchasing all species listed in mix. If a species can't be located, contractor must replace each missing species '� with the acceptable substitutions (listetl above). Contractor is responsible for providing seed tags to appropriate City staff, if required for project. This mix �' is based on 70 seeds/ square foot and is only calculated for one acre. This mix is based on the contractor using a drill seed application. Mix shoultl be dou- ,� bled if hand broadcasted. Contractor is responsible for calculating the appropriate seed amounts to purchase. Please note that the pounds per acre are � in PLS (Pure Live Seed) antl must be ordered that way. All materials furnished shall be free of Colorado State noxious weeds as defned in Article III, � Section 21-40 of the Code of the City of Fort Collins. � �} � _�: �i�� L;��^ :�* �� ,� � � I, � � � � � :� � � � � -. � � � 5 �� - 4 � 4 � i i. DETENTION BASIN MIX Common Name Scientific Name lbs/PLS/ Acre Plains coreopsis Coreopsis tinctoria U.17 � Whitc prairie clover Dalea cnndicla 0.65 � o Purpl�; Prairie clover Da1ea �in�plu�ea 0.81 � tiIndian i�lanketflower Gaillardic� aristata 1.85 � Mexican hat Ratil�icln colulnnifera 0.2 In�lian ricegrass Achnntheruin hvine��oides 1.13 Sideoats graina Botiteloi�a c,tu�tipendtlla 1.15 Buffalograss Boutelolia dactyloides 3.27 Blue grama Botiteloua �raci]is 0.25 G Inland saltgrass Distichlis stricta 0.35 � � Bottlebrush squirreltail Elylnus elymoides 0.95 Streambank wheatgrass L'lymus 1mlceolatus ssp. lanceolnttis 1.36 Prairie Junegrass Koeleria lnacrnntha 0.08 Western wheatgrass Pasco�yrilm smithii 1.61 Little bluestem Schizachyrium sco�nrium 0.7 Total ior lletention Sasin Mix 14.54 Ibs/PLS/Acre ACCEPTASLE SUBSTITUTES FOR WILDFLOWERS Blue f7ax (I inum lec�>isiiJ 0.83 Ibs/PLS/Acre �, Black-eyed Susan (I�udbf:�ckio hirtaJ 0.14 1bs/PI.S/Acre � �' Pr�irie aster (Mrrchaeranthera 1an�rc.e;ti foli�rJ 0.4,<� ]bs/PLS/Acre r+ � ACCEPTABLE SUBSTITUTES FOR GRASSES � � �' Salt and pepper grass (DeschamE�sia cnespitosaJ 0.071bs/PLS/Acre Six weeks fescue (Vulpia oc,toflora) 0.1J Ibs/PLS/Acre Slender wheatgrass (Elymus trachycaulus) 1.361bs/PLS/Acz�e � *Contractor is responsible for locating and purchasing all species listetl in mix. If a species can't be located, contractor must replace each missing spe- � cies with the acceptable substitutions (listetl above). Contractor is responsible for provitling seed tags to appropriate City stafF, if required for project. �' This mix is basetl on 70 seeds/ square foot and is only calculated for one acre. This mix is based on the contractor using a drill seetl application. Mix ,� should be doubled if hantl broadcasted. Contractor is responsible for calculating the appropriate seetl amounts to purchase. Please note that the � pountls per acre are in PLS (Pure Live Seed) antl must be orderetl that way. All materials furnished shall be free of Colorado State noxious weeds as �+ defned in Article III, Section 21-40 of the Code of the City of Fort Collins. � � �} Erosion and Sediment Control Escrow/Security Calculation for The City of Fort Collins Project: 5206 Fossil Creek Drive, Fort Collins, CO EROSION CONTROL BMPs Silt Fence (SF) Concrete Washout Area (CWA) Vehicle Tracking Control (VTC) Rock Socks (RS) BMP Amount Estimated Quantity Units 145 LF 1 EA 1 EA 20 LF Reseeding Amount Sub-Total 1.5 x Sub-Total Amount of security: Unit Price of Seeding per acre: $720.00 Disturbed Acres: 0.76 Unit Price $2.00 $500.00 $500.00 $5.00 Total Acres x Price/acre: Sub-Total: 1.5 x Sub-Total: Amount to Re-seed: Miniumum Escrow Amount Minimum escrow amount: Final Escrow Amount Erosion Control Escrow Total Price $290.00 $500.00 $500.00 $100.00 $1,390.00 $2,085.00 $2, 085. 00 $547.20 $547.20 $820.80 $820.80 $1,500.00 $2, 085.00 "The mrio�snt of dhe security �nust be based o�x nne and o�ae-half'times the esznriate of tHe cost to instal/ the approved �neasures, or one and one-h�alf'tin:es the cost to re-vegetate the disturbed /arrd In dry land grasses based upnn unit cosi deter»iined by th�e Czty's A�nual Revegetation and Stabilization� Bfd, ivhichever is greater. L¢ ian instnnce, wi/l the aninuirt of'security be less tlean one thnusand five Ir�un�i•ed dn/lars ($1,500) f'or resideiztinl develnprraent nr three thousan�l dollars (Ji3,000) for commercial denelopment" 5/15/2020 9:41 AM hrips://d.docs.live.netl0e018cb1e76890ea/Documents/Keefe Civil/2019-17-Hammersmith/Fossil CreeklDrainage/Emsion Control/Pearson_Escrow.xls EXISTING RESIDENTIAL � FND �r4 RE�AR - --��5°�'��l ' �LF��- i �- IAT \ I � � � � \ J ;- � � � � � � N � I I ��--► Y � \ I I �I ~ �� LIMITS OF GRADING � _ � � � � �� _ _ D � a � �/ , � � �. � , �� i \ i �� / � ( � g � C � <5�19� — , �i � � � 2.53 / � \ I � \ f\�� EXISTING RESIDENTIAL 0 � : ;1'10°� 410.78` , ,, � , ,� �``� % ��';021) - %�ln� '-�: � LIMITS OF GRADING \ � �� 1 / \ I I � o / \ � �, 1 I � N \ W� ; � 0 o I \ �� \ � o � � \ � � � � g � � � �� z \ 1 � \ \ � �� \ �S � I r� � � 1 `�-� I o � � i � � .\ \ � �s \ o \ \ J � � � � �� \ \ \ \ \ \ � \ � � . � ), �„; � _ l ; � � i �� - / � �� / / cRR°�n' n"�W 404.27' � � � \ \ � � \ � \ � \ -�' , � 1 � � i � \ \ � � � � I / I I \ \ � �� \ 1 "',' � � / ) �� \ � � �� ` � / \ N / � � / \ � � / �-�, ,� � ' � / � � � � �� / � I / � / / � `/ "`�-► � � / i � � � � / � � � � � i � ��' - � � �o� FND #4 REBAR W/RPG LS 17862 LEGEND: 501 5 5020 � o . . : . a . oa � ✓��-► EXISTING CONTOUR PROPOSED CONTOUR PROPOSED CONCRETE PROPOSED FLOWLINE CONCENTRATED DRAINAGE FLOW DIRECTION OVERLAND DRAINAGE FLOW DIRECTION � � � � � DRAINAGE BASIN BOUNDARY A DRAINAGE BASIN ID # DRAINAGE BASIN AREA (ACRES) 5.00 1 DRAINAGE BASIN DESIGN POINT EXISTING RESIDENTIAL BMP CONTROLS: — SF SF SF— ��'� � � �� _� �:� SF SP VTC CWA RS SILT FENCE STOCKPILE MANAGEMENT WITH PROTECTION VEHICLE TRACKING CONTROL CONCRETE WASHOUT AREA OVERLAPPING ROCK SOCK �. I � � � � � �� o I I �I \ � I I I l / �� . — � , � / � 1 �- — i / t / � / � �L � ii \ �� \ \ � i � � \ � � �i t�, � � DIli�lll � � _ � • [ '� \ � � � � � � � � � �J � � Y � W � w � oC w U> J � �o � 0 L,L 50 � g� " � N90°00'00°E 19.52' FND #4 REBAR W/BPC, LS 34174 / / � � � � II �I l 1 1 ` I I T f � �1� � � / FND #i RLBAR \I I NO CAP FND #k4 RE(3AR W/BPC, LS 34174 � �� I � � Deita= 36°52°43" 1 / � R=50.00' L=32.18' , I / � Dir= N71 °32'33"W � Chord= 31.63' ABBREVIATION LEGEND: AC ACRES CWA CONCRETE WASHOUT AREA DS DOWNSPOUT DWG DRAWING EG EXISTING GROUND FF FINISHED FLOOR FG FINISHED GRADE FL FLOWLINE FS FINISHED SURFACE (CONCRETE) GB GRADE BREAK GFF GARAGE FINISHED FLOOR HP HIGH POINT LP LOW POINT ROW RIGHT-OF-WAY SF SILT FENCE SP STOCKPILE VTC VEHICLE TRACTION CONTROL 30 0' 15 30 60 1" = 30' FOR DRAINAGE REVIEW ONLY NOT FOR CONSTRUCTION EXISTING RESIDENTIAL Adjusted Site Site Adjusted Site �ite Hisi�rie Hist��ie A��a D�vEiGp�� Gev�io�er� Hardscape or Hard Surface Area (sf) (sf) Area (sf) Area (sf) HSp1181i, I,OIICfeie LLU 'LLU %,'L'L25 %,'L'L25 Rooftop 4,977 4,977 8,835 8,835 Gravel (40%) 6,454 2,582 3,870 1,548 Total Impervious Area 11,651 7,779 19,933 17,611 Lot size (sf) 138,090 Total Site Imperviousness 5.6% 12.8% • � � Know what's belOW. CaII before you dig. � m � 0 I rn 0 N O Z m O � ,� � � 0 N 0 N o � z � 0 �`' w o ~ ¢ 0 � ��P D 0 L ICFiL O �: •'N � L � k�.�`S'F� •� � . �, �,. � � 39378 m i . . � o��y,a�,�,�9�aa�v . .� Rea;o��,�;e�s�,o, • � ��. ,. �� css •..�::°��NG,�� NA� E� J J � � �� O >wo > �oo�U v �o�� wz��w LL �z"'� N W �� ,Otiw i oo c� °' � � ..o. � �� , � n / %i r �,d � I I\\ � � . � ' �� ' � � ;''I� T \� 0 � Z � a J O >WaQ � � J � o Q�O W Z � O w Q � U U � Z c� J � Q Z � � J O � O � W Z U o�� ap� O � � W a SHEET 30F3