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Home My WebLink About5E Jeffers Pass Storm Sewer O� p ��+P � � U tr� 4646 Dakota Street SE '�INx�so� Prior Lake, MN 55372 CITY COUNCIL AGENDA REPORT MEETING DATE: JUNE 10, 2013 AGENDA #: 5E PREPARED BY PETE YOUNG, WATER RESOURCES ENGINEER PRESENTER PETE YOUNG, WATER RESOURCES ENGINEER AGENDA ITEM: CONSIDER APPROVAL OF A RESOLUTION ACCEPTING QUOTES AND AWARDiNG THE CITY'S STANDARDIZED CONSTRUCTION CONTRACT FOR THE JEFFERS PASS STORM SEWER ADDITIONS PROJECT (CITY PROJECT #STM-2012-006). DISCUSSION: Introduction This agenda item considers approval of a resolution accepting quotes and awarding a standardized construction contract for the Jeffers Pass Storm Sewer Additions project (City Project #STM-2012-006). Histo Stormwater management infrastructure in the vicinity of the proposed project was installed in 2005-2006 as part of the Jeffers Pond — South Phase development (City Project #03-31). Approximately 362 acres of land drains to the large wetland to the west of the project location. There is an existing stormwater structure (outlet) for this wetland that maintains the water level and controls the flow from the drainage area. After leaving the wetland, water flows under Wilds Ridge NW in a storm sewer pipe and through an open channel (see stormwater flow routing diagram, Attachment 1) before discharging through another storm sewer pipe under Jeffers Pass NW. The water from this pipe then discharges to the Prior Lake Outlet Channel, operated by the Prior Lake-Spring Lake Watershed District (PLSLWD). After reviewing the stormwater flows in this area, City staff determined that that the existing stormwater management infrastructure at Jeffers Pass NW will not provide the public with adequate protection from flooding during large rainfall events. The current developer (The Ryland Group) provided the City with $17,000 to be applied against the installation of additional stormwater management infrastructure in this area. Current Circumstances The City is currently relying on a single 15-inch concrete pipe to manage all stormwater flows that pass under Jeffers Pass NW. City staff used HydroCAD (a well-accepted computer aided design program for modeling stormwater runoffl to simulate stormwater flows through this pipe. During large storm events, water levels are projected to threaten at least one nearby home and the roadway itself because the roadway will act like a dam (with the 15-inch culvert as the outlet). The following table contains results from the HydroCAD model for the existing conditions: Table 1— Existin Conditions H droCAD model results) Storm Event (rainfall in a Maximum Water Level at 24-hour eriod Jeffers Pass NW ft. 2- r 2.8 inches 897.84 10- r 4.2 inches 901.84 100- r 6.0 inches 909.54 The lowest floor elevation (LFE) of the closest home (14922 Jeffers Pass NW) is 903.5 feet (see Certificate of Survey, Attachment 2). According to City requirements, outlined in the Public Works Design Manual (Part III, Section 4, page 41), the LFE for a home must be at least 2 feet above the HWL (the 100- yr High Water Level) of adjacent water bodies or stormwater features. Because the existing home has a LFE of 903.5 feet, the HWL should be 901.5 feet or lower. Therefore, the home located at 14922 Jeffers Pass NW does not meet City requirements and will be threatened by even a 10-year storm event, as shown in Table 1. The top of the roadway in this location is about 910.4 feet. With a 100-year storm event, water levels will rise to within about 0.86 feet of the top of the roadway. Even a slight restriction in capacity of the 15-inch pipe (which could be caused by debris caught in the trash guard) would cause water to overtop Jeffers Pass NW, threatening public safety and downstream homes along Trail Point Ct NW (the cul-de-sac on the east side of Jeffers Pass NW). To decrease the local flooding risk and protect public safety, City staff proposes to implement a project to install an additional pipe (and associated stormwater infrastructure) under Jeffers Pass NW. This additional pipe will alleviate flooding and public safety concerns by providing additional flow capacity during large storm events. Table 2 outlines the HydroCAD model results for the same location under proposed conditions: Table 2— Pro osed Conditions H droCAD model results) Storm Event (rainfall in a Maximum Water Level at 24-hour eriod Jeffers Pass NW ft. 2- r 2.8 inches 897.84 10- r 4.2 inches 901.20 100- r 6.0 inches 901.46 This table illustrates that the existing pipe will continue to manage stormwater during smaller storm events, such as the 2-year event. The maximum water level does not change between existing and proposed conditions for the 2- year event because the proposed additional pipe would be set at a higher elevation and therefore would not flow during smaller storms. For larger storms (10-year and 100-year), the proposed additional pipe will provide enough capacity so that the maximum water levels will not threaten any nearby public or private structures or infrastructure. City staff, in conjunction with a private consultant (Pioneer Engineering), developed a plan set outlining the installation of the proposed additional storm sewer pipe (see Attachment 3). Quote requests were sent out to 3 potential contractors and City staff received 2 quotes (from MP Nexlevel, LLC and Ellingson Drainage, Inc.): 2 Table 3 — Quotes Received Com an Quote Amount Ellin son Draina e, Inc. $64,369.30 MP Nexlevel, LLC $80,620.71 PLSLWD has approved a permit for this project after reviewing the plan set. A City ROW permit will also be required. Conclusion City staff recommends accepting the quote of the lowest responsible contractor (Ellingson Drainage, Inc.) to construct this project. The contractor is ready to implement this project and may proceed after approval from the City Council and entering into a standard construction contract. ISSUES: Floodinq The installation of this project is necessary to protect public safety and decrease flooding risk to private property. Without the proposed stormwater additions, one private residence and Jeffers Pass NW will be threatened with flooding during all large storm events. Trunk Fund The majority of the funding for this project is to be derived from the City's trunk fund. The trunk fund is used for oversizing of stormwater infrastructure to meet regional stormwater management needs. According to the City's 2030 Comprehensive Land Use Plan (Chapter 7, Surface Water Management, Section 7.5, Hydrologic Modeling, p. 152), trunk stormwater facilities are defined as those facilities that are not lateral or local systems — in other words, facilities of regional significance that provide flood control. Stormwater runoff generated from over 362 acres of land (containing 508 residential lots and one golf course) drains through one existing 15" pipe, making this a very significant flooding concern for the City. Trunk stormwater facilities must be designed to accommodate 100-year storm event discharges; the proposed project meets this requirement. Oversizing costs from the trunk fund for this area should have been proposed in conjunction with the original development, so the proposed allocation from the trunk fund at this time corrects a critical stormwater infrastructure design flaw. In addition, the cost of potential property damage outweighs the cost to install the additional stormwater infrastructure proposed by this project because of the threats to the adjacent home and the roadway. Proiect Management The City is acting as the project lead/general contractor for this project. By providing approximately 26% of the project costs, the developer of Jeffers 6tn Addition (Ryland Group) is acknowledging that the project is needed for flood control based on the potential impacts to homes on the downstream side of the proposed stormwater additions. However, the majority of the benefits of completing this project will be realized by upstream residents and other residents who use Jeffers Pass NW. Because of the regional flooding/stormwater management concerns, and because the original developer is no longer involved with any aspect of development in this area, the City should tead the project. 3 FINANCIAL The total cost to install the project, if the quote from Ellingson Drainage, Inc. IMPACT: is accepted, is $64,369.30. The funding sources have been identified as follows: R land Grou Develo er $17,000.00 Trunk Fund $47,369.30 Total $64, 369.30 ALTERNATIVES: The alternatives are as follows: 1. Approve a resolution accepting quotes and awarding a standardized construction contract for the Jeffers Pass Storm Sewer Additions project (City Project #STM-2013-006). 2. Deny this item for a specific reason and provide staff with direction. 3. Table this item to a certain date in the future. RECOMMENDED Alternative #1 MOTION: 4 O� p ��+P ti � U tr� 4646 Dakota Street SE �INNESD�P Prior Lake, MN 55372 RESOLUTION 13-xxx A RESOLUTION ACCEPTING QUOTES AND AWARDING THE CITY'S STANDARDIZED CONSTRUCTION CONTRACT FOR THE JEFFERS PASS STORM SEWER ADDITIONS PROJECT (CITY PROJECT #STM-2012-006) Motion By: Second By: WHEREAS, Additional storm sewer pipe is needed to protect public safety and alleviate flooding concerns; and WHEREAS, Pursuant to a request for quotes for the Jeffers Pass Storm Sewer Additions Project (City Project #STM-2012-006) which includes excavation, directional storm sewer pipe boring, and stabilization work; and WHEREAS, Two quotes were received in accordance with City requirements; and WHEREAS, The following quotes were received complying with the request: COMPANY QUOTE AMOUNT Ellin son Draina e, Inc. $64,369.30 MP Nexlevel, LLC $80,620.71 ; and WHEREAS, Ellingson Drainage, Inc. is the lowest responsible quote provider; and WHEREAS, City staff has received a required permit from the Prior Lake-Spring Lake Watershed District; and WHEREAS, The project plan set was developed in accordance with City of Prior Lake ordinances. NOW THEREFORE, BE IT HEREBY RESOLVED BY THE CITY COUNCIL OF PRIOR LAKE, MINNESOTA as follows: 1. The recitals set forth above are incorporated herein. 2. The Mayor and City Manager are hereby authorized to enter into the City's standard contract with Ellingson Drainage, Inc. of West Concord, Minnesota in the name of the City of Prior Lake for the Jeffers Pass Storm Sewer Additions Project (City Project #STM-2012-006) in the amount of $64,369.30. 3. The funding sources for the Jeffers Pass Storm Sewer Additions Project (City Project #STM- 2012-006) are as follows: R land Grou Develo er $17,000.00 Trunk Fund $47,369.30 Total $64,369.30 PASSED AND ADOPTED THIS 10th DAY OF JUNE 2013. 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Nlendota lieights, MN 55120 w ea�gine��ivcg' Coon Rapids, MN 55433 (651)631 1914 Fax:6819483 �� (7G3)733 i8S0 F�x:783 1fiS3 CIVII.LNGINEERS LANDPLANNLRS LINDSURVGYORS LANDSCAPEARCI�TGCfS Mendota Heights Office Certificate of Survey for: WENSMANN HOMES ADDRE55: 14922 JEFFERS PASS NW � BUYER: MODEL ELEVATION: ,.�` ' LOT AREA =13,367 SQ FT OR . �Qp. � POR ?378Q � FT e � S �Fiy T q� �� SIDEWALK/LANDING AREA =170 SQ FT ,o D �,; + � DRIVEWAY AREA =926 SQ FT F�4�GTj�� Ly- � COVERAGE =31.29 <q�,Ty \� 908 � (�� (� i � r � ' � l i ' V �� \ �I �� L. �� / \\� ./ �2'� (VACANT) � ��/`� � 90}.2 : �: �� i l�� ' � 911.7 � / g� � l o \ x . eois� a' i � BENCH MARK: / `. � o eoao �� 6 2 s )3 --TOP OF SPIKE y� / i h� � 4 s � ELEV.=909.76 � / , � � \ \� O //VI /� � � 0 �� q�� •^. ` � � ( �\; � � � 902.4 �' � �\ � 909.8 / v . J ` n-j �� t p i o� 6 � 3 3 . � ai � �n , 26 8 /�� (� , , ` , `y o o � o : � 90 5 � / �i oi `' \ 2 911.4 �O � !/�/ l � "�a V � / � � .31� 4 9t3.s . l � �/ / ` � �qop / �v 1 ^ 909.5 911.4 17. ` � , «1' � / v �a , k; � ,H /0` / c�� i / � . o i p .- soi.� a� o o �Q �� Q- � i O �.. eii.i 9ii.i / . soo.a / ��>� i � �� h Q 2- iO J �Q Op eoeJ / ' ` ��- � :� r '� � �°�� i \ � 1 � � / 908.9/ � �•. p / �� 900A h \� H99.6 n� O � I ry�- o�� 911.1 - � / ' 4 ti o 0 3 �-� / ' 9 �.o 4 2 �� ^7 ih /^` �� 9C9.2 Q 0� 8�? � f 1 / � `� m.g Q � � "�'� eoz.o 3533 0 ' �o �`' � \�' � sto.s / ? =��= � �� . �QaO� ry�� ` ,� S n . � � '� , 56` \/ � . � � � ` / � h` J �.7 ��p• l,.i. 907.2 6 ^ � � ?� � � �/ '� � o ��,` ei�.o�� ` ro (rJ > > �F ,r , s � � �°�� o; � ^ � � � � � S4 � w•� �} / -� � � � 7 ; � 'e �,� �� o r � , /� // 4� � �ti /�� >D 905.7' 909.3 . 9 910. � �� ) v v o � z6 8 91 D.6 .. � �� 910.2 � � j � 910.5 � 910. 1 EXISiING WETLAND W2 �� / /�? � , pR VE� OUTLET=896.31 APPROVQD �� / HWL=898.2 ��IMG DEpT�,� �� w�`� . -� C DEPT \ _�_` � 9 �.�� g 7 0 7 °� `, gi�� Date BENCH MARK: Si ne p;�Q �� BENCH MA 3 � TOP OF SPIKE TOP NUT HYDRANT U 61 ELEV.=905.70 ELEV.=913.90 NOTE: ADD BRICK LEDGE AS REOUIRED HOUSE ELEVATIONS :(PROPOSEDI/ASBUILT NOTE: GRADING PLAN BY FIONEER LAST �ATED 7/e/O5 WAS USED �� `� TO DETERMINE THE PROPOSED ELEVATIONS SHOWN ON n�is ceRnFicnre. LOWEST FLOOR ELEVATION �I1?'?� NOTE; PRO?OSED BUILDING DIMENSIONS SHOWN ARE FOR HORIZONTAL TOP OF FOUNDATION ELEV. � !�IL�t�� LOCAi1CN OF STRUCNRES ON THE LOT ONLY. CONTACT BUILDER PRIOR 70 CONSTRUCTION FOR APPROVED CONSTRUCTION PLANS. GARAGE SLAB ELEV. � DOOR: ��+!'�� NOiE: NO S?ECIfIC SOILS INVESTIGATION HAS BEEN PERFORMED�ON iH15 LOT BY THE SURVEYOR, THE SUITABIUTY OF SOILS TO SUPPORT THE SPECIFIC HOUSE PROPOSED iS NOT THE RESPONSIBILITY DF THE SURVEYOR. X 000.00 DENO7ES Ex15TING ELEVATION I�IO7E: THIS CERTIFICATE DOES NOT PURPORT TO SHOY1 EASENENTS OTHER ( D00_00 ) DENOTES PROPOSED ELEVATION THAN THOSE SHOWN ON 'fHE RECOR�ED PLAT. --- �ENOTES ORAINAGE AND UTILITY EASENENT NO �: CON nACTGR MUSi VE�If-Y C�IVc'd:AY DE51GN. � CENO'ES ORAI\ACE �LO`N O!REC'�OM NOTE: BEARINGS SHOWN ARE BASED ON AN ASSUMED DATUM -- a' - DENOTES SPIKE 000.00 DENOTES ELEVATION ON VJE HEREBY CERTIFY TO WENSMANN HOMES THAT THIS IS A TRUE AND CORRECT REPRESENTATION OF A SURVEY OF THE BOU�DARIES OF: LOT 3, BLOCK 12, JEFFERS POND FIRST ADDITION SCOTT COUNTY, MINNESOTA IT DOES NOT PURPORT TO SHOW 1�1PROVEMENTS OR ENCROACHMENTS, EXCEPT AS SHOVJN, AS SURVEYED BY ME OR UNDER MY DIRECT SUPERVISION THIS 25TH DAY OF JULY 2007. � VIS D: NOfc -- SIGNED: �,. PIO EER ENGINEERING, P.A. SCALE : 1 INCH = 30 FEET '� �%� er: �i �;7 _ 3843 705159049 MTW Peter J. Hawkinson License No. 42299 MendotaH�e�i pI �� ComiRapidsO�ce 2422 Ente se D�ive � 201 85th Avenue N.W. Mendota F3eights, MN SS17A � 2 !�`n Coon Rapids, NIN 55433 (651)681 1914 Fax:68J 9488 1 (763)�83 1880 Fax:783 1833 CNII. ENGINEEILS LAND PLANNERS i.AND SURVEYORS LANASCAPE ARC[�TECIS Mendota Heights Office Certificate of Survey for: WENSMANN HOMES ADDRESS: 14922 JEFFERS PASS NW, PRIOR LAKE, MN BUYER: MODE�: ELEVATION: LOT AREA =73,367 SQ FT O,p HOUSE AREA =2,540 SQ FT F q/ POR AS SQ FT � � SIDEWALK/LANDING AREA =110 SQ FT T ,o' 1 'O / DRIVEWAY AREA =926 SQ FT F 'Q� U T/�� p,� COVERAGE =31.2� �9 �- 900 \� �,, � �_`°� � �` �s �h � �` � ', 6 32. � O �' � \ � �u �2 � (VACANT) - .� � �� ,� ' 903-2 �j 911.7 � �` , �� O �. x / .s 902 �, � BENCH MARK: � ..` N 0 gp3_p \ 62 J �-TOP OF SPIKE � / . �, � �� S4 3 S O � ELEV.=909.76 � Q� ' / , � �� // �� o o2.a \� �� /'. ��' ` � ,�+� � {,_ 902.4 ^ q)' � � 909.8 v '� �'� � 0 s � 3 � a/ 26 /� �� / � �� . o � • „� � so . 3 ^� � � � 8 � 911.4 �O�" ti . �. 913.9 � �/ / � � �� 4! � / � ^ 909.5� �� ` /� `�� 7 / { P so . ar sas�o° o e �`� �i �e�- � � •; � �p . 9,�., e,,., 900.0 � I 0\ j'�^ �7• � J Q� O 909. � / 1 \0 �� lO � e % O � ^ 'o ��` .•, / i / \ � � � ��`�§9�.t 9 �� p�� o � ` � ' � . / / � 900.0 h� 099.6 h/ � ` I� j N� �,o�'.�� 917.1 '� 911.0 L, �h \ � �� 909.2 o 9 J�� ,^��'�.'� .� � � : , / ti 1910.6 / , � m � >� g \p 3,g ry o' � � � 2S �n 1 i o � ,,�030 . p. � < ��° � S6 � � °•' eo�s e� i � / ,�� / .C� �... � � � `�, `� 'f�. � � 911.0 '� � �+/ � � B ��F �62 \ �' O/ / � �O � � 4 � r i / 1 O� h z \ �� 9 ;.� i� �� (y � � 905.7 ' : . 910. 909.3 kt •8p , 26 � �C�� 910.6 , ` � /, _ � � 970.2 �/ 1 � 970.5 � ..970. 'l / � EXISTING WETLAND W2 i; �/ /h � OUTLET=896.31 � 4� �`` /� / 30 / r � H WL= 898.2 � m � � / _ � �� v �� BENCH MARK: BENCH MARK: 4i � TOP OF SPIKE TOP NUT HYDRANT Lt Bt 3 ELEV.=905.70 ELEV.=913.90 No7E ADD BRICK IFDGE AS REWIRW HOUSE ELEVATIbNS /(PROPOSED)/ASBUILT N �� TO DE'fERMNE lHE P ELEVATI NS SHOWN n+�is�c�rsnFlCnh. LOWEST FLOOR ELEVATION • f�63�>> NOiE: PROPOSED BUILDING OIMENSIONS SHOWN ARE FOR HORIZONTAL TOP OF FOUNDATION ELEV. ��RIZ� LOCAl10N OF SiRUCNRES ON THE LAT ONLY. CONTACT BUIIDER GARAGE SLAB ELEV. � DOOR : �Z'" PRIOR TO CONSTRUCTION FOR APPROVED CONSTRUC710N PLANS. . NOTE: NO SPEqFlC SOIlS INVES77CAi10N HAS BF�7J PFRFORAIEO ON THIS LOT BY THE SURVEYOR. THE SUITABIIJTY OF SOILS TO SUPPORT THE SPEGFlC HOUSE PROPOSm IS NOT lHE RESPONSIBIUTY OF 7HE SVRVEYOR. X 000.00 DENOTES E%ISiINC ELEVATION NOTE: 7HI5 CERi1FlCAiE DOES N0T PURPORT TO SHOW EASEMENTS OTHER ( 000.00 ) DENOTES PROPOSEO ELEVATION 7HAN THOSE 310WN ON 7HE RECOR�ED PIAT. ___ DENOTES ORAINAGE AND UTILJTY EASEMENT NOTE: CONTRACTOR MUST VERIFY DRIVEWAY OE9GN. �- DENOtES DRAINAGE FLOW DIRECTION NOTE BEAR�NGS SHOWN ARE BASm ON AN ASSUMED DATUM '-'�- DFNOiES SPIKE OOO.DO DENOTES ELEVATfON ON WE HEREBY CERTIFY TO WENSMANN HOMES THAT THIS IS A TRUE AND CORRECT REPRESENTATION OF A SURVEY OF THE BOUNDARIES OF: LOT 3, BLOCK 12, JEFFERS POND FIRST ADDITION SCOTT COUNTY, MINNESOTA IT DOES NOT PURPORT TO SHOW IMPROVEMENTS OR ENCROACHMENTS, EXCEPT AS SHOWN, AS SURVEYED BY ME OR UNDER MY DIRECT SUPERVISION THIS 25TH DAY OF JULY 2007. w E�: N : SIGNED: / P� ER EC NGINEERING, P.A. xx-xx-�n xn� �� , SCALE : 1 INCH = 30 FEET gY . �� 1 ' i 3843 105159049 MTW Peter J. Hawkinson License No. 42299 , CITY OF PRIC�R LAKE . � Impervious Surface Calculations � (To be 5ubmitted•with �uilding Permit Applica6oq) . For All Properties Located in the Shareland District (SD). The Maximum Impervious Surface Coverage Permitted in 30 Percent. Property Address �¢qzz �PF�P�,� l'�s5 ( N.A. — SEE TABL� ' Lot Area ( N.A. — SEE TABLE ) Sq. Feet x 30% _ .............. � �***��*�**��***�**��*�****��*�**$*******�*��****��***��*��*��**��** LENGTH WIDT�i SQ. FEET . HOUSE X • x - � ATTACHED G�GE X � TOTAI. PRTNCIPLE STRUCTURE ...................... �, SQD S'F ' DETACHED BLDGS x (Gara�elShed) X ._.--- TOT.4L DETACHED BUILDINGS ....................... . DRNEWAY/PAVED AREAS X Qi�'v� — 9 f G (Driveway-paved or not) x f;r �,,,q r• — l(Q S• � (Sidewalk/Parking Areas) X TOTA.I� PAVED AREAS ......................................... /�D 3 6 S F • � PATTOS/PORCHES/DECKS x � �� — ZZO S•F• (Open Decks'�� min opening betwecn X — boazds, with a pccvious surface below. j!1 g s.� are not considered to be impervious) ��'�' — X — TOTALDECKS ........................................................ 5�S S.� �� :, OTHER X - X — TOTAL O'I'IIER ...................................................... 'x'OTAL IMPERVIOUS SURFACE � _ � � s,t' UNDER/OVER ( N.A. — SEE TABLE ) — Prepared By !��P✓ �' �liwKi� SOn Date ��Z9�0'1 Company Pioneer Engineering Phone # 651 Lot 3. Block l Z. JEFFERS POND FIR.ST ADI�TTTnN � .....:. .... ... . � .....;. ... ..... N � � � Q g fN W :� .�] f0 '. (O :� � . (O (O . .; ? ��° p � N �. .O :Cn O '. 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