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9. Preliminary Wqter Supply Investigation Report for Well Siting, Authorize Pump Testing for Wells 2 & 3 I . , (:;i CITY 4F ,___ ..., cHANHAssEs 1 ,,,,., , 690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 55317 (612) 937-1900 74,0 '% C-, "+�""^-sr.,t^.0 ��` Vt MEMORANDUM ;;1 rx,44,4 r TO: Don Ashworth, City Manager .;.M =7_ _ K, Alibi,,,,,I i. , 1"∎'"` .V:'. I FROM: Gary Warren, City Engineer)/ W/) . DATE: June 7 , 1989 G-/2--i9F ISUBJ: Receive Draft of Preliminary Water Supply Investigation Report for Well Siting, Authorize Pump Testing for Wells 2 and 3 IFile No. 89-4 Attached is a draft preliminary water supply investigation report I prepared by Bruce Liesch Associates. The document is in draft form at this time by necessity; awaiting pump testing results for wells #2 and #3. By obtaining this testing information at this I point, the preliminary study can further define our options for developing wells #2 or #3 to assist in well design and defining maximum pump capabilities for these wells. The cost for this test pumping is estimated to be $5 , 000 to $7 ,000 . IThe report presents a very concise review of the City ' s hydro- geology. It basically concludes that the City is relatively rich I in groundwater capabilities , although there is a geological transformation from east to west across the area which needs to be recognized in siting of future wells . The initial interest in the report, aside from the obvious interest in expanding our well I capacity, was to seek alternative aquifers to diversify the City ' s source of groundwater. This I hold as still a goal as we continue to develop future groundwater resources in the City and I the report does show some potential glacial drift areas in figure 3 that will be kept in mind for future siting. I The most expeditious and cost-effective approach to adding addi- tional pumping capacity to our system appears to be upgrading well #3 . In the interest of providing a little bit more direc- tion in this endeavor , it is my recommendation that pump testing I be conducted at wells #2 and #3 to better define our options for maximizing our current facilities at these locations. I am encouraged by the preliminary data review which indicates that I both of these wells appear to have capacities in excess of 66 gallons per minute per foot of drawdown. If this parameter holds true, pumping rates of 1600 to 1800 gallons per minute may be possible at well #3 which would be an increase of 60% over its II current delivery. It is therefore recommended that pump testing of wells #2 and #3 be authorized in the amount not to exceed $7 ,000 . I 3 II Don Ashworth June 7 , 1989 Page 2 Attachments 1. Draft Preliminary Water Supply Investigation. 2 . March 7 , 1989 memo to Don Ashworth. 3. Fund 402 budget. c: James de Lambert, Liesch & Associates Harold Summitt, Liesch & Associates 1 1 1 i I 'I I I I CITY OF CHANHASSEN PRELIMINARY WATER SUPPLY INVESTIGATION eft* 4;1?'4 4NA> t PREPARED FOR: I THE CITY OF CHANHASSEN I M 1 I 1 1 '?- ' irz7- BRUCE A. LIESCH ASSOCIATES, INC , : ., HYDROGEOLOGISTS ENGINEERS ENVIRONMENTAL SCIENTISTS 3020 Harbor Lane•Minneapolis.MN 55447 612-559-1423•FAX No:559-2202 I I A II TABLE OF CONTENTS ' 4 Paqe Introduction 1 Hydrogeology , A 1 Area Ground Water Use 4 TA Existing City Wells 4 Conclusions and Discussion 7 { FIGURES 1 Figure 1 - Study Area Locations Following Text Figure 2 - Stratigraphic Column Following Text Figure 3 - Geologic Map Following Text 1 Figure 4 Well Location Map Map Pocket APPENDICES Appendix A - City Well Logs FollowingFigures Appendix B - Area Well Logs FollowingFigures 1 1 1 _ 1 .1 MI Introduction II J A review of available data was conducted to determneYthe various II; options and feasibility of adding an additional water well to the City of Chanhassen ' s municipal system. The review included an evaluation of current ground water use, glacial drift and bedrock hydrogeology and city expansion plans . The investigation included I i a search of public and private well data within the City of r Chanhassen. Locations and driller' s logs for wells reviewed in ' this report are identified on Figure 4 and in the appendices, respectfully. Sources for existing information, include the Minnesota Geological Society (MGS ) , Minnesota Department of Natural Resources (DNR ) , the City of Chanhassen, and the files of Bruce A. Liesch Associates, Inc. (Liesch) . I Hydrogeology The City of Chanhassen is underlain by a variable sequence of glacial drift. This glacial drift is a result of the Wisconsin glaciation, specifically the Des Moines lobe . The majority of the City is primarily underlain by glacial till while the far eastern border is underlain by deposits of sand and gravel outwash and terrace sands . According to the well logs, the glacial deposits in Chanhassen extend from the surface to depths ranging from 146 to 437 feet. This 291-foot range in depth is a result of both surface topography and bedrock relief. The glacial till deposits consist of an unsonted mixture of sand, silt and clay with some gravel and cobbles. These sediments have been deposited by glacial ice and are typically low permeability formations which function as aquitards restricting the movement of groundwater and confining deeper aquifers. I 1 I • R Deposits of glacial outwash consist of sand and grave, J �ch has I ., been deposited by glacial meltwater. The action of the /glacial meltwater serves to sort these deposits which often occur as narrow II I1 sinuous bands of highly permeable aquifer material . In areas where -I' the glacial deposits are underlain by relatively easily eroded bedrock, the glacial meltwater has often eroded the bedrock surface I forming valleys which have subsequently been filled with a variety -, of materials which can include glacial outwash. This situation II I - often makes these buried bedrock valleys favorable locations for f' drift aquifer development within the Twin Cities area. I tY ..�-, The bedrock formations, underlying the glacial deposits, consist All of a sequence of I q paleozoic sedimentary units composed of sandstone, shale, limestone and dolomite. These formations occur in II relatively horizontal layers which, within the City of Chanhassen, have been eroded with the younger or more recent formations '� occurring in the northeastern II _v portion of the City. The bedrock surface drops stratigraphically towards the southwest such that I progressively older formations are exposed beneath the glacial 1 J drift in this direction. A generalized stratigraphic column illustrating the relative position of each formation has been II included as Figure 2 . 1 The St. Peter Sandstone , the most recent bedrock formation reported I u ported in Chanhassen, is present only in the northeastern corner of the City. This formation is a light-gray, massively bedded sandstone. II It is a well sorted, medium grained, poorly cemented quartzose II1 sandstone . The St. Peter Formation reportedly reaches up to 173 ' thick in the northeastern portion of Chanhassen. I II r II 2 II • JI .. The next unit in descending order is the Prairie .DU '-Qhien group. ' The Prairie Du Chien is present in most of Chanhassen/ in varying ' thickness. The Prairie Du Chien is reported up to 92 feet thick in the northeast section of the City and has been eroded away completely in the western and southern portions . This area has ' been shown on Figure 3 . The Prairie Du Chien group consists of the Shakopee Formation and the Oneonta Dolomite. The Shakopee Formation is a thin to thick bedded, buff colored sandstone which is silt and sand rich. Thin sandstone beds occur near the base . The Oneonta Dolomite is a thin to thick bedded, medium grained, buff colored dolostone . The Jordan Sandstone lies below the Prairie Du Chien. The Jordan ' Sandstone is present without the Prairie Du Chien only in a small band along the northwestern boundary and the southwestern diagonal ' of the City. The Prairie Du Chien Dolomite acts as a protective cap to the easily eroded Jordan Sandstone . The Jordan Sandstone ' is a light gray, massively bedded, medium to coarse grain quartzose sandstone which is well sorted and poorly cemented. The Jordan is reported in thicknesses ranging from 90 ' to 132 ' within the City of Chanhassen. The combined Prairie Du Chien - Jordan aquifer is the most widely utilized source of groundwater supply in the area. Of the two units, the Jordan Sandstone has the greater porosity, while the Prairie Du Chien group can also provide high yields . These ' formations are generally considered to function as a single hydraulic unit due to the lack of an effective confining layer. ' The permeability of the Prairie Du Chien is primarily a result of fractures, fissures and solution cavities occurring within the dolomite. 3 1 , me II -j 1 The St. Lawrence Formation, the next descending unit,°. exists as the I top bedrock unit along the middle eastern border and across the „ southern portion of the City. In these areas the overlying Jordan, II APrairie Du Chien, and St. Peter Formations have been eroded away. The St. Lawrence Formation is a gray to tan, silty or sandy dolostone . This formation serves as a semi-confining layer that II separates the Prairie Du Chien - Jordan from underlying formations. The St. Lawrence Formation ranges in thickness from 30 to 40 feet I a within the City. II i The -next significant hydrogeologic unit is a somewhat variable sequence of shaley sandstones including the Franconia, Ironton and I -i Galesville sandstones. In combination, these formations are capable of supplying relatively small to moderate quantities of i II water. The only locations for which information is available is at Chanhassen City Well #4 and Chaska City Well #6 (Section 5 ) . IIAt Chanhassen City Well #4 the Franconia, Ironton and Galesville sandstones group is 230 ' thick. At Chaska City Well #6 , in combination, these three units are 234 ' thick. I 1 The next unit in descending order is the Eau Claire Formation. I This unit generally consists of fine to medium grain silty sandstone and shale. The formation is reportedly 103 feet thick IIat Chaska City Well #6 . The Eau Claire formation serves as an effective confining layer between the Franconia-Ironton-Galesville and underlying Mount Simon-Hinckley Aquifers . 1 The Mt. Simon and Hinckley Sandstone combine to form the deepest I t major aquifer in the area. The Mt. Simon-Hinckley is not as l heavily utilized in the Twin Cities and surrounding area as the I Prairie Du Chien-Jordan because of lower transmission characteristics, greater pumping lifts, and increased construction II costs . Generally, moderate yields are available from the Mt. Simon-Hinckley. This aquifer is being considered and utilized more II 4 II JI . . .ii. _ I li /frequently in areas where contamination of shallower sou2•cas has occurred and where competition for groundwater near heavy pumping IIcenters has created excessive interference between wells . Below the Hinckley Formation lies a thick sequence of PreCambrian IIclassics known as the Fond du Lac Formation. The Fond du Lac and deeper formations are not generally utilized for groundwater Isupply. Area Ground Water Use IIGround water use within the City of Chanhassen includes domestic supply, public supply for parks, irrigation and municipal water 11 1 supply. The Department of Natural Resources reports that 12 wells I lk, ra ermitted for high capacity use within the City of Chanhassen. I Five f these wells are operated by the City. Within the City, the Iii ■PPrai ie Du Chien-Jordan aquifer is the major source of groundwater supply for all wells. In areas where these formations have been 1�T substantially eroded either deeper bedrock formations or shallower il . • drift formations may be utilized. II At this time groundwater withdrawals within the City appear relatively light and from a yield standpoint should not restrict the placement of additional wells within the Prairie Du Chien- . ilJordan Aquifer. Information regarding potential yields from additional bedrock aquifers and the glacial drift sources is limited owing to minimal usage. I I 5 II I ■ , Existing City Wells `, II The majority of the wells drilled within the City of Chanhassen are for domestic and small business use; thus, low capacity wells. Of II the 69 well logs obtained from the Minnesota Geological Society, I only 12 wells are permitted high capacity well . Fiv of those wells are owned and operated by the City o nhassen for municipal water supply. u3 of the city wells are used in the I municipal system while we 1 number/ is a "standby" well located near the Minnetonka Middle School . I The following information is available regarding the City's wells: I ,. S-r Co L ,4u ! u ,p�.3Gy �40y5 City Well #1 / Got 44) Unique Num er:/ 22099S ^. '! Aquifer: P irie Du Chien-Jordan �� Well Depth: 18 Feet S 0 II Casings: 10-inch to 109 feet 11 ' '4-_ 6-inch to 335 Feet S II tatic WatertLevel . 1962 - 170 Feet City Well #2 I Unique Number: 220976 IIAquifer: Prairie Du Chien-Jordan Well Depth: 471 Feet Casings: -inch to 153 feet I -inch to 246 Feet Static Water Level: 1969 - 108 Feet I August 13, 1988 - 145 Feet March 4 , 1989 - 133. 5 Feet I II 1 6 I • I a City Well #3 ' Unique Number: 200195 Aquifer: Prairie Du Chien-Jordan Well Depth: Casings: 30-inch to 130 feet IL 16-inch to 317 Feet Static Water Level : June 14 , 1988 - 161 . 5 Feet March 5 , 1989 - 148 . 5 Feet City Well #4 ' Unique Number: 180913 Aquifer: Prairie Du Chien-Jordan and Franconia-Ironton-Galesville? Well Depth: Original well depth 665 feet, backfilled to? Casings: 24-inch to 273 feet 18-inch to 289 Feet ' Static Water Level : July 20 , 1988 - 95 Feet December 10 , 1988 - 80 feet City Well #5 Unique Number: Aquifer: Prairie Du Chien-Jordan r ' Well Depth: 520 Feet f��4� , Y+�►o(aL� S tiou Casings : 12-inch to 235 feet 10-inch to 419 Feet Static Water Level : 1963 - 1709 feet ' Water level records, provided by the City of Chanhassen, were also reviewed as part of this investigation. The records for wells 2 , ' 3 and 4 suggests that all three wells are finished in highly productive segments of the Prairie Du Chien-Jordan Aquifer. Wells ' 2 and 3 demonstrate 12 to 15 feet of drawdown at pumping rates of approximately 1 , 000 gallons per minute ( gpm) . The specific ' capacity of a well may be expressed in terms of gallons per minute per foot of drawdown ( gpm/ft. ) . The specific capacity for wells 2 and 3 is in excess of 66 gpm/ft. Well 4 demonstrates more ' 7 1 r , 1 drawdown at 950 gpm resulting in a specific capacity of II "" approximately 30 gpm/ft. after pumping for two hours. The records for Well 4 also suggest II ggest that water levels continue to decline as 4 pumping continues. Well construction records for Well 4 suggest that the observed decrease in specific capacity may be related to a limited thickness of Prairie Du Chien formation at the well site II. z The pumping records suggest that Well 3 could be �" I - 4 operated at a higher pumping rate . A static water level of 170 feet and an inner y casing depth of 319 feet results in maximum available drawdown in II excess of 100 feet with the pump set near the bottom of the 16-inch inner casing. Currently only a fraction of the available drawdown Af I - ; is utilized. The actual additional drawdown is utilized. The _ § actual additional quantity of water which may be available from II _z Well 3 will largely depend on the size and type of pumping equipment which may safely be operated in the well based on casing I diameter and well alignment. Pumping rates of 1600 to 1800 gpm may be possible at Well 3. 1 x f The productive section of the Prairie Du Chien-Jordan aquifer near Wells 2 and 3 also suggest the possibility that additional wells II could be installed in the vicinity of existing wells . Mote detailed pumping test data would be necessary to accuratel y predict II - the magnitude of interference between existing and proposed wells at given distances. I Conclusions and Discussion II Several sources of groundwater supply have potential for further II development within the City of Chanhassen. Factors which will determine which of these options are more favorable include the I desired area for expansion of the supply (based on development trends ) , time frame for development additional sources, required I 1 1 8 II 1 i ti L I. T. amount of water and desire to diversity sources as well as additional factors related to the hydrogeology of the area. These include actual available water quality and quantity from each potential source and the related well construction and operating costs . , The following options have been identified under this investigation: A) Increase the capacity of existing Well 3 . B ) Construction of Additional Prairie Du Chien-Jordan Well ( s ) . C ) Investigation and development of glacial drift sources . D ) Investigation and development of deeper bedrock sources. Discussion A) Increasing the capacity of the existing Well 3 may be the JIquickest way of increasing the quantity of water available to i the city. The feasibility of this option depends on the 11 ability of the well to accommodate higher capacity pumping equipment in addition to the well hydraulics. The water level readings provided by the city in combination with the geologic log suggests that additional capacity may be available . To more, fully define the feasibility of this option a short term `, pumping test should be conducted a* W - = - If the �_ pumping test results are favorable , the existing pumping equipment should be removed, well and casing depths measured and a plumA9ness and alignment test conducted to determine maximum II pump intake depths and the maximum size of pump bowls and column which may be installed in the well . I I 9 I IN 1 II.; I B ) Review of the hydrogeologic information for the area as weiii. II 4 as the water level data for Well 2 and 3 suggests tha ' ,\ �� additional Prairie Du Chien-Jordan wells could be constructed ' 1 within the northeastern portion of the city. Figure 3 illustrates the general area, based on available data, where II i a Prairie Du Chien-Jordan well may be considered as the areas labelled OSTP and OPDC . The Prairie Du Chien formation has IIapparently been eroded along the western and southern boundaries of the city and as such these areas would not be - suitable. Even within the area where the Prairie Du Chien II occurs as the first bedrock formation irregularities in this • surface could adversely affect waled-e-v-e-1-apn�. Owing to the I favorable characteristics o - Wells 2 and 3, i appears as though an additional well or wells could be develloped within A2 II the vicinity of these well - . Pumping tests coulee//be conducted -fits at these wells to assist in determining ell design and acceptable well spacing. II While developing additional Prairie Du Chien-Jordan well s /' will not diversify the city' s source of groundwater, this • option has the advantage of known yields and water quality as I observed at the existing city wells. DevelopmentPn additional well near an existing well would require a minimal I amount of exploration and investigative costs. iv fo II C ) Figure 3 shows four general areas where the availablejsuggests that glacial drift wells could potentially be developed as a source of groundwater supply. Glacial drift formations can I be highly variable and potential well sites should be thoroughly investigated through the use of appropriate I geophysical techniques and test drilling and aquifer testing to determine available water quality and quantity prior to I constructing permanent production wells. II 10 I Al• • Irt , IVDevelopment of drift wells would have the benefit --of diversifying the city' s source of groundwater. Beyond thees) lik exploration and testing phase of drift aquifer development;'' this potential source has the additional benefit of generally ih lower construction costs and construction time as well as the potential for lower operational costs based on reduced pump lifts . Ili D ) Deeper bedrock sources (below the Prairie Du Chien-Jordan) may also be available for development. These include the Ili Franconia-Ironton-Galesville and Mount Simon-Hinckley ItI . aquifers. There is a4lquaatity of information regarding these aquifers in the Chanhassen area owing to the availability of Ishallower sources which may be utilized. However, the Mount Simon-Hinckley aquifer is receiving increasing consideration for potential development particularly where shallower I aquifers have been impacted by contamination or heavy usage . The City of Chaska r- . : ed Corr-s-truuted a M cult Simon- Hinckley well i he northwestern corner of Chanhass n. The IIlog for this wall provides the only information a able for the aquifer in the e ea. Pit this location, the (,,,,e,4715. aquifer was encountered between the depths of 672 and 817 feet and was test pumped at 1800 gpm Q IIDevelopment of this potential source would involve increased construction and operational costs owing to substantially 1 increased well depths and pumping levels. If this aquifer is considered for potential development, additional information IIshould be collected and reviewed from outside the area of this I 11 II 11 I a 1. ' investigation if necessary. Yields from the Mount Simon- ' Hinckley can vary from location to location and in some areas unfavorable water quality has been observed. Information regarding these aspects of the aquifer may be available from the City of Chaska or other nearby high capacity users . 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'r---..-----'.--- --- - ....---'-L---21-•L''.'"..r" -• • '''-• - ...- .,.., -...- ,r i .-. . - .......... s . . -- .."-- -.4 -• :-=i....-‘'.. ..,...6V,,.., •• ----..'".."-:-......: .1.."="7----- -...... ----•--"--7.7. - -'''''''''. 1 MILE 1/2 0 1 MILE SOURCE: USGS TOPOGRAPHIC MAP ii I , i I SCALE 7..---.11.1,11.111/111111r BRUCE A.LIESCH ASSOCIATES,INC. - ../..,-• -- CITY OF CHANHASSEN APR 89 4.•,..,:nntii,i,„,rx„,,:. Hvork-xoGisTs•GEoLoGisis•E IWEPONEAEN IAL SC1E NT1STS -, STUDY AREA LOCATION FIG. 1 . .. . • .1C21 Hmt.or l 0,P•M.rwmooms MN S.5.24••,..2 Sf.4..423 t 7819 - , E 1 Graphic ' Approx. Water—Bearing Characteristics General Description Column System Rock Unit thickness eett) Drstributwn of modem and confining beds is poorly known I t7 Glacisl rilh out.asti,and aaikr tram tend and panel.lake eland ho and sand and paaN squJm gnat rick malvae to argr anwtu e Undifferentiated 0-500 allusions of several ages and neral prosena ices:•cn cal and bunzontal ° ow —'w*MN air cannel in boned bedrock aautys s� glacial deposits dnlnbution a imam is consoles u 7 e I -..-9----0 y Shale.greennn•gray fissile to blocky:includes thin discontinuous lenses Decorah Shale of lrssuhlerous limestone that inmate in abundance upoard Aquifer Lo.yields from fractures in shale and solution camber in dolosloir Platteville Formation to 35 Dolostone.hght•gray to buff.thin-so med.-bedded.thaly t I • Confuting bed Glenwood Formation to 5 Shale.greenish-fray.fissile.sandy Aquifer:moderate Yields I _ 1SO Sandstone.Ioanaue.;muu`N well sorted.y� bate St.Peter Sandstone «mrnled,giiassatut:appeal.- COG° . Confining bed I� e SO Dolostone.buff.thin-to thick•bedded.salt-and sand•neh.med.-Fr.thus'- Shakopee Formation MINI I L sandstone beds near base :J o n o t Aquifer high yields from'mol rrs m dolostone and from 7 ult•saze rafa�fa poorly cemented sandstone:principal aqudes of the 100 Dolostote-buff•thin-to dtick•bedded.way.med••p•• —M T,.m Ca)Daum ti Oneota Dolomite loom te mama Sandstone.fight-Fray.massively bedded.med-to coarse-Fr melt 'iii . . Jordan Sandstone poorly cemented.quartzes,' l--- --- Contemn{bed 50 Daotone•pay to tan.salty or sandy.araillaecous:glaucomuc in upper ag>♦NN• I St.Lawrence Formation p,rt isr.�rl�Mtt� Aquifer. Ind yields 155 Sandstone.greenish-Fray.thin-bedded.fine-to coarse•gr silty to dolomitic ::.:.:.-:•: .:.-• Confimng bed commonly glaucooilic;an upper aquifer I Reno,n a nne•fr.sandstone .... Franconia Formation -:ss:r:r.•:a:: C Ironton Sandstone 30 Sandstone.light-gray,poorly to well sorted-sled•pt.salt-nat.quartzose aqu in nioJerato to hills.olds A O Galesville Sandstone 35 Sandstone.tight-gray-well sorted.tine-to mod•er.yuartzose I v Sandstone.red.fine•to hied-er silts.glauconine:mteroedded win Confining bed Eau Claire Formation to 130 grayish-green to red.fissile shale 160 Sandstone.bght•guy,fine•io coarse-gr yuertzox.thin shale beds in ...loiter moderate to filch yetis,second most imp.:ru.^.• Mt.Simon Sandstone upper pan aywter of Twin City basin Hinckley Sandstone 75 Panamint.tan.fed•to coarse•gr.arsmic O a. a 'ni O Fond Ju LJC Form.uon t0 3.000 Sandstone and.dWone,fine•gr well ccmcmcd,art.xic..nterRJdcJ with red to green nlicaceOea shale , [ and older sedimentary rocks = Confining bed d OM MOW Metamorphic to 20.000 North mane.la•a tlowa win inn mterlior•cJimenis • = in ' yn.e.yww and Igneous Rocks SOURCE: GEOLOGY OF MINNESOTA: A CENTENNIAL VOLUME I BY P. K. SIMS AND G. B. MOREY, EDITORS _ I BRUCE LIESCHASSOCIATES,INC. CITY OF CHANHASSEN y/ ,- / HYDt?CIOGIStS•GEOtOGiSrS•ErMPONMENIAt.SCSNSISIS FIG. ' _.-,74: =f1/29:::. STRATIGRAPHIC COLUMN 2 3020 motto,Lone•Minrteaodis MN SSW•c'2;,54 id23 s ' 517818 ;-- ..„„-7.-_.-1. -, , ,..,---..•,....,._ ....,, / • -,_-..-i' i_7?-...,4 ..--,,,,"/- •1‘. 4..■, ‘„,-7:,,,,,. ,. ...:-. .` .•'-, ",. '.4.--.4 ..., .„,,,,,,,:-„,,, r 4,4:t,- 2 --./ "' / --.47 , ,':- .., •,...0.,.. I, _ .. i . , ,.. , s ... . .... ii. . ,....... ...‘„,... __. ..... ...••••„. .•_•t. ..,..., ...„, .., ...,4 . ...."PI:-.7.,Z1:= .7.--..--"7-...-", A • ■ i t-'-"*"‘tir• ‘ ,..., -L. •....■....... ....,.. A • 11.0 •• 4: ‹s:•.7 •. ,,,,,•nr--,-7 ?ma.4.4,. ? ...... ...-„. • 3HOR C14000 •••• . , '''......•,•6'7';•7:t•-.••.;:7::• ____ •______.• E.,......?4, •! 7.. -14. .......•..:ca..H..,._-_.:...7‘.)-:-... „, ,,---'9.-A....0:.;.:. ...4..-1' c.....,, % . .C.' -- • . 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BOX 147 • CHANHASSEN, MINNESOTA 55317 (612) 937-1900 ' MEMORANDUM TO: Don Ashworth , City Manager FROM: Gary Warren, City Engineer , DATE: March 7 , 1989 SUBJ: .__ Municipal Well No. 5 Preliminary Water Supply Investigations File No. 89-4 1 As a part of the discussion which surrounded the necessity for the construction of the Lake Lucy Road trunk watermain , the need for a new municipal well in the city ' s system has been questioned. At the time we embarked on the preparation of the feasibility study for the Lake Lucy Road trunk watermain , staff prepared an updated forecast to evaluate when system demand would dictate the need for Well No. 5 . The dater System Analysis study prepared for the City in 1985 concluded that construction for Well No. 5 should commence in 1991 in order to be on line in 1992 . he usage demand forecasts included in that report I believe were :accurate for that time; however, with the growth and industrial ,1evelopment that the City has experienced the past few years , I oelieve that the siting process should be accelerated to investi.;ate the best location for this well and the preferred aquifer arrangement. If it is indeed true that we are in the third year of a five-year drought, I believe the preliminary investigation for siting the well could be very useful for us to expedite the installation of Well No. 5. With this in mind I have obtained the attached proposal for pre- liminary water supply investigations from Bruce A. Liesch Associates , Inc. B. A. Liesch is a firm that has a strong background in conducting geologic and hydrologic investigations of this nature. They are very Knowledgeable in Minnesota aquifers and well drilling and their $2 , 883 fee appears quite reasonable. Depending on the type of well that would be built, i .e. glacial drift well versus a deep bedrock well , the timeline for the actual design , construction and placing the well in ser- vice could be up to one year ' s time . eI ' Don Ashworth March 7 , 1989 Page 2 You will recall that in the Water Expansion Fund budget we had ' anticipated a 1990 expenditure for construction of Well No. 5 . As a result, I believe that initiation of services at this time would start us on the road for keeping with this schedule and meeting the system demands. I have therefore authorized Bruce A. ' Liesch and Associates to commence with the preliminary water supply investigations for Well No. 5 in accordance with their March 6 , 1989 proposal . Attachments ' 1'. Preliminary Water Supply Investigation Proposal . 2 . Fund 402 Water Expansion excerpt. 1 1 1 1 ' 1 FUND: 402 WATER EXPANSION FUNCTION: CAPITAL PROJECT FUND 1989 BUDGET Com entary This fund derives its money from water hook-up charges and is dedicated to pay oversizing and other general benefit costs associated with the water utility system. Revenue into this fund fluctuates greatly in that collections are based on development in areas where trunk costs were not assessed as part of the construction project. FIVE YEAR CAPITAL IMPROVEMENT PROGRAM FOR THE CHANHASSEN WATER SYSTEM YEAR DESCRIPTION ESTIMATED COST 1933 Install chart recorders on wells and elevated tanks. 15,000 Watermain replacements 1. Bowling alley 12,000 2. Creek Run 8,000 20,000 General repairs 1 • 10,000 45,000 1989 Painting and general repair of West 76th Street water tower 75,000 Remove pumps and liner at well 44 and overhaul/repair as necessary 25,000 1 Construct Lake Lucy Road Trunk Watermain 150,000* General Repairs 10,000 260,000 1990 --�� Construct Well 45 1 80,000 -"rw-- Painting and general repair of Murray Hill Water tower 120,000 1 General Repairs 15,000 215,000 1 1991 Remove pumps and liner at well 42 and overhaul/repair as necessary 30,000 General Repairs 15.000 1992 General Repairs 45,000 15.000 15,000 Note: Lake Lucy trunk watermain feasibility has been authorized. The feasibility study will pose several funding scenarios. $200,000 Bonds of 1986, $150,000 - 402. -67- ,1