The URL can be used to link to this page

Home My WebLink About10A - Prior Lake Water Supply Plan MEETING DATE: AGENDA #: PREPARED BY: AGENDA ITEM: DISCUSSION: 16200 Eagle Creek Avenue S.E. Prior Lake, MN 55372-1714 CITY COUNCIL AGENDA REPORT NOVEMBER 20, 2006 10A STEVE ALBRECHT, DIRECTOR OF PUBLIC WORKS REPORT ON THE CITY OF PRIOR LAKE WATER SUPPLY PLAN Introduction The purpose of this report is to update the City Council on the status of the City's water system and discuss issues related to the Water Supply Plan. Historv, In January 2005, the City Council adopted the City's Comprehensive Water System Plan. This plan detailed the future water system and the required water rates and development fees. In July 2006, the City Council approved the de- tailed 1 O-year Water Supply Plan for the City as part of the Comprehensive Plan. This plan updated the previous system plan and is based on the City's Capital Improvements Program (CIP). Current Circumstances City Staff has worked with consultants and the Department of Natural Re- sources to develop a long-term plan to meet the City's water system needs. This is very much a working plan and is updated frequently as new water supply and development issues and information become available. The City's Water Supply Plan is founded on the principles of the City's 2030 Vi- sion and strategic plan that emphasize production, conservation, education and communication. The plan has the primary goal of providing a reliable, sustain- able, quality and environmentally responsible water system for current and fu- ture residents. All of the recommendations staff make to the City Council regarding the plan are built on the primary design standard of providing "Firm Capacity" in our wa- ter system. Firm capacity is the industry standard and requires that a City be able to fight a large fire on a peak use day with the largest well out of service. Not only must a City have adequate pumping capacity but must have adequate storage to operate the system during this critical event. Attached to the report are Figures 1 and 2 which show the City's needed and proposed firm pumping capacity and water storage. Based on the above principles the City Staff has created a 2030 Water Supply Plan that includes the following needed improvements: 2007 . Wells NO.8 and 9: Complete permanent connections of Wells NO.8 and 9 prior to pumping season. Well No.8 currently is connected via an emer- gency manual system to the City's water supply. Well NO.9 will be consid- ered for completion under agenda item 10B by the City Council. __, : ' ,': : '. ' "') .': 0'~ -, ,.... ;.WWw.cityolpriorlake.com Phone 952.447.4230 / Fax 952.447.4245 . Well No. 10: Begin construction of Well No. 10. Well No. 10 will be needed to provide a sustainable water supply to the Water Treatment Facility (WTF). Well NO.1 0 will be a new Jordan Well located south of Fire Station No. 1 in Wilderness Ponds Park along Fish Point Road. This well will be connected to the water treatment facility via the CR 21 project. Approval of this well by the DNR is discussed in the issues section of this report. . Water Treatment Facilitv: Begin construction of the Water Treatment Facility and Water Storage. On December 20, 2006, the City Council will be receiv- ing a report on construction of a 6.5 MGD Water Treatment Facility and 1.5 MG ground storage facility. 2009 . Well No. 11: Construct Well No. 11 in the Annexation Area to complete the Jordan Aquifer Pumping Test. . 1.0 MG Ground Storaae: Construct a 1.0 MG ground storage facility in the Wilds Ridge area to address current and prevent future operational issues with the pressure zones in the Wilds and new development along CR 42. 2012 . Well No. 12: Construct Well No. 12 in the Annexation Area to meet system firm capacity and water quality issues in the western system. 2014-2015 . Well No. 13: Construct Well No. 13 in the Annexation Area to meet system treated water requirements upon completion of the Annexation Water Treatment Facility. Well NO.6 which is untreated will only be used in emer- gency situations after completion of Well No. 13. . Water Treatment Facilitv NO.2: Construct a second 3.0 MGD Water Treat- ment Facility and 1.5 MG ground storage facility to provide treated water for the annexation area. 2020 . Water Tower NO.3: Construct a 1.0 MG water tower in the annexation area to provide appropriate pressure and storage for the annexation area. 2028 . Well No. 14: Construct Well No. 14 in the annexation area to meet water system firm capacity needs. . Water Treatment Facilitv NO.2 EXDansion: Add 2.0 MGD of filter capacity to Water Treatment Facility NO.2 to meet build-out water quality needs. The above water system improvements in the annexation area are predicated on a certain rate of growth. Those improvements will be solely developed utiliz- ing development fees and therefore will not be constructed unless development warrants the improvements. ISSUES: There are several issues related to the above-referenced Water Supply Plan improvements: 1) Well NO.9 Well NO.9 is an integral piece of the City's eastern water system. The DNR is requiring construction of this well as part of the approval for Well NO.8. Additionally, because the City's ability to drill new wells on the east side of the lake is limited by impacts to the Savage Fen, the water from this well is vital for the City to meet firm capacity needs. For this reason staff recommends completion of Well NO.9 which will be dis- cussed as Agenda Item No. 10B on November 20, 2006. 2) Kraemer Quarrv Plant City Staff has had several informal discussions with the Cities of Savage and Burnsville about the 4.0 MGD Kraemer Quarry Surface Water Treatment Plant (SWTP). Those Cities have secured a substantial amount of funding from the State for construction of a surface water treatment plant to be located in the Burnsville Kraemer Quarry. How- ever, at this time, no formal agreement between Burnsville and Kraemer has been executed. Due to Burnsville's and Savage's concerns regard- ing need, cost apportionment and operational issues there is a chance this project will not move forward. Regardless, City Staff has explored Prior Lake's options related to par- ticipating in a partnership with Savage and Burnsville to purchase water from the SWTP. Savage has proposed that Prior Lake would need to commit to between 1.0 and 1.4 MGD from the plant year round. This is essentially equal to one well in the City's system. The cost to purchase water is yet to be determined but most likely is in the $1.40 to $1.85 range per thousand gallons based on preliminary information. Those costs are due to capital expenses incurred by Kraemer, Burnsville and Savage. While this would offer a unique partnership opportunity, it pre- sents a substantial financial issue for Prior Lake. By purchasing the water from the SWTP, the City would lose a minimum of $500,000 per year in water revenues. Those revenues are already anticipated, programmed and allocated in the City's CIP and would re- quire an estimated $0.70 rate increase to offset lost revenue to the City. City wells which are funded by new development fees take 2-3 years to recoup the initial investment and are the most cost effective way for the City to generate revenues to operate, maintain and reconstruct our water system. Due to the above listed financial reasons, City Staff does not recommend participation in the Kraemer Quarry Plant at this time. 3) Jordan Acuifer Pumoinc Test On August 21, 2006, the City Council approved the Jordan Aquifer Pumping Test on the west side of the lake. As previously discussed, the goal of this test was to determine the impacts of Jordan wells located on the west side of Prior Lake on the Savage Fen. As part of that test, the City drilled test holes in the 40-acre City Spring Lake Park site and How- ard Lake Park (Spring Lake Estates) as shown on attached Figure 3. The City's contractor did not locate the Jordan Aquifer at either of those locations. This was contrary to all previous information mapped by the Minnesota Geological Survey and local well logs. Last week the City completed a test hole on the 40-acre property known as Honey's Back 40 immediately west of CR 17 and Spring Lake Estates. That test hole indicated a very good thickness of Jordan Aquifer for future City Wells. Over the next several weeks the City will complete more test holes in the annexation area to define how many wells we can anticipate in the an- nexation area. The results of these test holes will determine whether the Annexation Area can provide an adequate well field. The City's Water Supply Plan is predicated on a minimum of four future wells in the annexation area. If the City is unable to construct four wells in the annexation area it may be necessary to investigate installation of a small water treatment plant at the booster station facility for Well NO.6 in the Wilds. An additional well would also be needed at that site. This alternative will be further evalu- ated in the future if needed. For the above listed reasons the City will not be able to construct Well No. 10 as originally planned for the pumping test on the west side of the lake. It will most likely be 2008 or 2009 before a well can be constructed in the annexation area so the pumping test originally scheduled for next year can be completed due to the aquifer location. For that reason Staff is recommending switching the locations of Wells 10 and 11 in the CIP. 4) Well No. 10 As discussed under item 3 and the Water Supply Plan improvements listed above, Well No. 10 will be located south of the fire station on Fish Point Road at Wilderness Pond Park. This well is in the CIP and is nec- essary to provide a sustainable water source for the water treatment plant. Currently the City has three Jordan wells (3, 4, and 5) located very close to each other. During peak summer use, these wells interfere with each other and production of all three wells is substantially impacted causing operational issues and low production rates (up to a 500 gpm system drop). City Staff has proposed to the DNR that Well NO.5 be used only as an emergency well and the capacity currently allocated to the City be moved to the south and future Well No. 10. This proposal meets the DNR's goal of moving pumping in the Jordan Aquifer away from the Savage Fen. It will also provide the City with additional capacity as Well 3, 4 and 10 will not influence each other. Currently when the City turns off Well No. 5 the production of Wells 3 and 4 stabilizes. 5) Water Treatment Facilitv On December 4, 2006, the City Council will review the Preliminary Engi- neering Report for the WTF. Due to the limited number of wells that will be available to the City in the annexation area, Staff is recommending that the Water Treatment Facility be oversized to treat up to 7.5 MGD in- stead of 6.5 MGD. This is the most water the City can provide on the east side of the lake to the WTF. The oversizing of the WTF will result in a negligible size increase to the building. This additional capacity would serve future development and would be funded by the Trunk Reserve Fund and would not be derived from existing users. 6) Water Rates No rate changes are proposed for the water system at this time. Of the improvements in the Water Supply Plan ,only the WTF No. 1 is proposed to be funded using utility funds as it serves the existing residents in Prior Lake. The balance of the improvements are to be constructed using trunk reserve fees generated from new development as the improve- ments are required due to growth. The fees we are collecting have been adjusted in anticipation of these expenses. FINANCIAL IMPACT: City Staff has reviewed existing water rates and does not feel that a rate adjustment will be required until 2009. At that time maintenance ex- penses due to replacement of the existing water system through the street reconstruction program and maintenance costs for the existing system will most likely warrant consideration of a rate increase. The City's Water Utility budget increases annually due to maintenance and personnel costs and ultimately rates will need to be adjusted to continue operation of the utility. All of the above improvements have been identified in the CIP and are funded by existing utility rates or the trunk reserve fund. No changes in utility rates or the trunk acreage charges are proposed at this time to complete the proposed projects. ALTERNATIVES: 1. Accept the report as presented. 2. Direct staff to make specific changes to the 2030 Water Supply Plan. Reviewed by: oyles, City Manager RECOMMENDED MOTION: Q CJ ::E Figure 1: 2030 Water Supply Plan - Firm Pumping Capacity 14 ; I 12 10 8 - 6 4 . I 2 - I o + 2007 2009 2010 2012 2014 2020 2028 2030 Year . Propo~ed_Capacity. R_~g~ired Capa~ity j CJ ::E 7 6 5- - 4 3. 21 1~- o -f----- 2007 Figure 2: 2030 Water Supply Plan - Firm Water Storage ---r-- 2009 2010 2012 Year -T 2014 2020 i D Proposed Storage . Required Storage L___ ___ __._ ___.________._________ r- 2028 2030 City of Prior Lake N Minnesota "~E 2006 wT s WATER SUPPLY SYSTEM PLAN . PROPOSED WATER SUPPLY . EXISTING WATER SUPPLY CITY BOUNDARY PROPOSED FUTURE ANNEXATION AREA SHAKOPEE MDEWAKANTON SIOUX COMMUNITY - TRUST PROPERTY Last u. ..,..,.. November 2006 CIty d Prior Lake Public WoriaI Depertment x:\publlc_worIaI\water _8upply\WIIl8r _suppIyJlla"_2006.apr 2000 ~ ThIs dr8wIng Is IlIIIIher . IegeIIy I1ICllIded map nor . lIUIV8Y end Is nollnlended to be used _ one. ThIs drawing Is . completion d __, InfonnetIon end dlIte from vertous city, county end alate oIIIcea end olher 8CUC8lI. ThIs document ahoukI be used for Illflnnce aMy. No l...,.auon Is mede lhet ~ pr-*d ecc&nIleIy twIled true . . ., ,... I. The CIty d Prior L.eke, or eny olher enllIy from whId1 dIIla _ obteIned, __ no IiebIIly for any emn or omIssIana henlln. If dIacnpencIea _ found, pleeae contact the CIty d Prior Lake. @ --~~~"4, ~.~'..._~~~ "6 ' " 0 2000 Feet HOWARD LAKE WTF ,~ JI WEuI 1W #14 wJ #12 ~ ,~ W~ #11 ~~ 6Eiyg';JT~V. < o ~\ .~ @ CAMPBELl. LAKE @ @ @ - ---.1 ~_I_~ju.~ ---.-'-~-~---- ~ . . D ~ .., I...i.. '''...........T <c,.. \ '., \; ~_l-O\'- . / /~/ G"'''_~_~ 4'~"r,~~o~~,- __ t <='-'---, -- & ~.:<'. k I~ E w~u..... "" ,- 1/ ?~~'! r ' ~'" )I fl ,/ "';;"r,o~ ,r;. "",,;;,r.DRt{;; -A W L v; :; b:: ~J ~ Z. '"0"""'1 IIIi !~I l ~ i ",.. ~~ ' ~ . """'. - -<1-,., ~~: 'Ti!i '!' ~3 "rS' "€\.",,:1;~ '-, 'WB'- ~c,G '0",,'0' .'~ \ wEit~., #4 T""'" " \. #3 ,#', \~~ ~5';'i; . .''\~c!!> .,' ~ ~~ -, .o'~'" ~. ,,,("> :.~! ! DVC'. o~$ wfIS~; ~.. I" BUN ,]" - 8'.1 ~'--:":,"i c,ot\i:" ~ LAKE ". <, ~j..^^, '-. Wl;}t {l~-. .f:.',. ~i;;;""'f( f.':'.1 it ~ ~ \:;~ ~cW!A~ O~fv ""~. ,.. ~ 'Ii- .-_"';((.4,. ~ - q,-t. S <. . ~; \~, '~f}~ (.~ ~h ~ ~ ~. 0""'.{"\~/ g""' aU ~ ~_.__I~._.J~ C(>;J;)A'l.<>Alt-' ~~.i;~,~ $G ,''i< :o-1~q'(-. '. HAAS LAKE <, c S 6 ; (LS c~ ~?,-~ (OS r_\L-LS-~~. "';L-DV,,~-"-RL ,,'; JEFFERS POND ~..~.~;:-~ MYSTIC lAKE .. ~.~..- P'''!;:I"''i, p:; y~~.~~,H "\ " :-1 S.,,1!"'. Of; \ .r/ /~ ,';, WELL #14 ,w.'~ r "<i (AlT.) ~" "':':- - ( ~"'. eoosfER E::' C f ['n'0-"~ ,~. ~(>,,~ ALT" ; ~--~$ '} e~ C1 . - t: ;c.'-><:~ tI_b...t.l IRl) -' F - ~~ \. ~iL^f " 1:"1 ~ . ~. ~ w:'RSE ~; < ARCTIC LAKE ~ ..,,,~ .c'" .; ,",ORTH1'1-00D"t. ""Lit.o UPPER PRIOR LAKE \ \ \,' LOIlE 1REE IStAN) 011 lWlllSI.E "\ \ ) 1V'~lA';[,ClI-> '" ': ." .;/}" /1 ,,' ,r-rr;j:::"', ;' I; ~ ; ,,~/ .,l'" &<' o. " 0:,i ~ ~ 1, t !. 4~ .1' ~/ ,.~"t c _,_ <J' v', __~--f. 0' . . \~'LlDWrw- "'~'.'-~-'^~ :;,\ ;.1.:4 if-----1 "00 ;;..r ,\ 5\ / WA Sl"ol<",,,SClR ___ ",".f" ~~ ._-.,-./'" \"" ~\., T.OWTERE s'""""- // )< '00 ''r """ .....--/::>__ 'i;<, _ Jr.... ' ' ~', ~y-:/ - ,cC'.' , .. ? ,,' ,-- ' g .<""_00,0' //-; .., 233 ' .~ CRVSTAlLAKE" \ ~ \- ;, 1:V-'" Cli;_ " ~~ ~' ~\. ;~~ ~ ~i . 3/ o~"'--\ 0., 1., c,,_~ ~~ SH~~ ;/ ( , " ./--""c~ \1, 'j:_ ~'''' "~~Jl' ~~<-tt ""'(G~ "\~ ~,'f.<;' '''",'~~ <>\ '" " " ~ I!_~V '? ,rP;::~'9 SPRING LAKE . // .....-:;,4 """"" ,0 ~ /,."",0'0 ,.c<'''' "'v~ /,/ s~-' f' /-<:;",- ~/,/ ctoJ? 0 ~,/;/ ;~~,-- "- 1: /'-__1.r"~ OlE'" S"- ./ _'!..~"r TH~~~,.?~~:' ~ L__T~-lf~~ ~t j; ~,:E~~ g~^'.A:',,_;rtR~~\-'I @ i' <>';:~~ 'i>'f1/.,~~~, RICE LAKE ~ ~ @] :t-~ J!I,y .g rf'- J::J-<' s<< ~'" ",-0 ~ HIlTHSTE ~ ~ " I ~ ~. C''''''''Q.~. "___... ; - . ',o:~T",,,,{ir,; ..,,,,.. A~"/' i. .'T W6W!R,,/ ,,-<'.' ' ~~. <. If! LOWER PRIOR LAKE REEIl'8 IStAN) . " ~ o . w t:;~ ,/:J! .// V ~r'=;lf"i'C ..,o~."'-I) o. O. '410,. ----B'Jii:l~I.~.:L' ,,,,.,;\.$\01<-' "'\ 6 "/~ \} MARKlE' "~ ~ :~ '" ~ ,~ l~ ~! i)~q}':f"Y ~"oG~'ss': ~ -;, 0 : " ';-"0<' .\.,.0~ ~ \t..~:' ,re'" t % \ ~ " 0<1- ~/ f~ <13:- IN .:;Z', t@~WEA.E_ t ~t l&'iTH~rE " . ~i ~~~IE ~