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HomeMy WebLinkAbout01/05/1993, 3 - WATER TREATMENT PLANT MODIFICATIONS, CITY PLAN NO. S-39M"1 f ► „ MEETING DATE V` C� �1" S� _..,l�S �B�Si.J� January 5 1993 COUNCIL AGENDA REPORT ITEM NUMBER: FROM: John MoVIties %� Prepared By: Gary W. Henderson .:a w Acting U Director Water Division Manager SUBJECT: Water Treatment Plant Modifications, City Plan No. S -39M CAO RECOMMENDATION By Motion: 1. Accept Withdrawal of the Low Bid from Mingus Constructors 2. Approve the Award to, and Authorize the Mayor to Execute a Contract with the Second Low Bidder, R. P. Richards in the Amount of $8,510,000 for the Construction of Water Treatment Plant Modifications, City Plan No. S -39M. 3. Approve Project Construction Budget Totalling $9,855,700 including Construction Management and Contingencies DISCUSSION The City's water treatment plant is over 30 years old and needs major renovation. The proposed improvements will increase operational efficiency and allow the plant to meet new water quality regulations. The 1986 amendments to the Safe Drinking Water Act (SDWA) necessitate the upgrade of the plant. The most significant issue for the City of San Luis Obispo are the new regulations aimed at reducing the formation of disinfection -by- products, specifically trihalomethanes (THMs), which are a group of compounds formed during disinfection by the reaction of chlorine with naturally occurring organics. The upgrade of the water treatment plant will enable the City to provide a high quality water supply to City residents which will meet all mandated health requirements. As a result of the upgrade of the existing equipment and processes, the nominal plant capacity will also be increased from the current capacity of 11.5 mgd to 16 mgd. It should be emphasized , however, that the increase in overall plant capacity is merely a result of the improved efficiency of existing processes due to the upgrade and not a goal of the project. There would be no significant cost savings associated with upgrading the facility in such a manner as to avoid the increase in nominal capacity. For a more detailed explanation of the project, see the attached staff report from the September 22, 1992 meeting of the City Council. On September 22, 1992, the City Council approved the plans and specifications for the Water Treatment Modifications and authorized staff to advertise for bids. Bids were received and opened_ on November 18, 1992. Eight bids were received for the project ranging from $7,675,000 to $9,526,000. The apparent low bid was received from Mingus Constructors, Inc. of Cottonwood, Arizona. On November 19, 1992, Mingus Constructors notified the City that a mistake was made in the preparation of their bid and requested that the bid be withdrawn. Review of additional documentation submitted by Mingus Constructors substantiates the claim of an error and therefore staff would recommend relieving them of their bid. �����►n►�►i�i►►IIIIIIP;1II I city of San. Js OBISp0 figNihimm COUNCIL AGENDA REPORT. Water Treatment Plant Modifications Page 2 The second low bidder was R.P. Richards Construction Company with a bid of $8,510,000. Black and Veatch and City staff have evaluated the bid documents and the qualifications and recommend that the contract be awarded to R.P. Richards of Goleta, California. FISCAL IMPACT The Engineer's estimate for the project was $9,107,000 excluding contingencies. The actual bid cost for this project are summarized as follows: As reflected above, the costs for this project are almost $1 million less than estimated. Project Financing As outlined in the 1991 -93 Financial Plan and our recent water rate review, it is anticipated that this project will be debt financed consistent with the City's Capital Financing and Debt Management policy (page B -8 through B -10 of the 1991 -93 Financial Plan). Under our existing agreements with these firms, we anticipate using Evensen Dodge as our Financial Advisor and Jones, Hall, Hill, and White as our Bond Counsel for this project. With this construction bid award, we anticipate returning to the Council in March with final financing documents for approval. As noted above, the proposed financing is consistent with the City's adopted debt management policies. Most notably, interest rates for traditional long term governmental financing are especially favorable at this time. Impact on Water Rates There will be no immediate impact on rates as a result of this project since debt service payments will not begin until at least 1994 -95 based on the following project schedule: Approve Plans and Specifications September 22, 1992 Award Bid January 1993 Secure Financing and Begin Construction March 1993 Complete Construction and Begin Debt Service November 1994 Engineer's Proposed Variance Estimate BudZet (Favorable) Contract Amount $9,107,000 $8,510,000 597,000 Construction Management 750,000 750,000 -- Contingencies 985.700 595.700 390.000 TOTAL $10,842,700 $9,855,700 987,000 As reflected above, the costs for this project are almost $1 million less than estimated. Project Financing As outlined in the 1991 -93 Financial Plan and our recent water rate review, it is anticipated that this project will be debt financed consistent with the City's Capital Financing and Debt Management policy (page B -8 through B -10 of the 1991 -93 Financial Plan). Under our existing agreements with these firms, we anticipate using Evensen Dodge as our Financial Advisor and Jones, Hall, Hill, and White as our Bond Counsel for this project. With this construction bid award, we anticipate returning to the Council in March with final financing documents for approval. As noted above, the proposed financing is consistent with the City's adopted debt management policies. Most notably, interest rates for traditional long term governmental financing are especially favorable at this time. Impact on Water Rates There will be no immediate impact on rates as a result of this project since debt service payments will not begin until at least 1994 -95 based on the following project schedule: Approve Plans and Specifications September 22, 1992 Award Bid January 1993 Secure Financing and Begin Construction March 1993 Complete Construction and Begin Debt Service November 1994 ����►►�►i�IUIIIIi�Ilh��Nl`► city of san ..ins oi3ispo COUNCIL AGENDA REPORT Water Treatment Plant Modifications Page 3 Debt service on this project was included in the five year water rate review presented to Council on June 2, 1992; however, it was based on a project cost of $7.6 million rather than the $9.85 million .currently anticipated. This will result in annual debt service requirements that are approximately $200,000 more than projected at that time. If all other assumptions remain valid, this will result in a rate increase of 3 % more than originally projected for 1994 -95, an average monthly increase of approximately $0.85 for a typical single family customer. However, there are many other factors besides this project that will affect future rates, including operating costs, other improvement costs, and water conservation levels. In accordance with City policy to conduct annual water rate reviews, full analysis of water rates will be brought to Council later this year. Conclusion City staff and Black and Veatch have reviewed the bids and related documentation and recommend that the Council award the contract for construction of the water treatment plant improvements to R. P. Richards of Goleta, California. The project will be debt financed and the final financing documents will be brought to the Council for approval in March of this year. Attachments: 1. Bid Summary 2. Capital Financing and Debt Management Policy 3. September 22, 1992 Staff Report U4 O ar tti a O� I d Z J CL } 'i T� n I J co F-- O d • N J Q N i1 -t-i LE N E O o+ 0 O 0 O ao •r O 0 0 o 7 p W F CC 4QY. O L+'1 O � u'1 r�1 %D O Z LL 0 O 0p aaS W LA � Q p O E-4 C W I .S'7 O 0 O 0 O 0 0 H 7 F CC 4QY. O L+'1 O � u'1 r�1 %D O co p� 0p aaS O E-4 C O' f- U S v z I 1 I I c� a w O r o W N Z C^i O H U O I .mod M C� u 1 C� O H W co 1= v p U �] U C I I I I I c � � a V] Z O O O O O CD � O i o IT cn `O v N Q of v1 CC co W r PG H j Q a I 1 I 1 r O O O p 00 a z o 0 0 0 0 U N o N n y 04 z z r� U =a I I I I z 0 0 °o 0 °o 0 °0 0 0 o° 0 _vf Q W W r o N ^d O O O u'f V1 .7 r` O+ O Z .r 0 W W ?a 1 I 1 I z Cl r = a a a .`aa >r 1 y � 0. ta0i aJ y d C r. Q f Ld c co r C ti u 7 y O 0 y N 0 m w 3 s+ I d m eo w L d M C 01 04 L E 07 91. m u `ri V. 01 W 07 FL L y d 2 -+ N C4 S .S'7 a s Mtvf w E- 0 w N Gd0 Off+ W A eh a P• I E O a W G Z 3 a LLI CL I-- } m U Oo IL V) m- O N J Z � a U) A o H A U M z H H U M w H D O o+ O m o O o O L p o a F U O > o Z ow LLI W 0: Q O Q O � N s N m W '.5 -,D O o O o O L p o 0 F U O > O N O Ln Om O\ cn s N m p N Ln N4 x eT P4 ~V OOZ— "7UU>a I 1 1 1 F 0 u1 o O Ln c•1 o V1 Ln ,cn _ %O Os N 1 Qm O\ Q O N c"1 r za o+ U 0 U jjil I I I I CL F. °o o° °0 00 cn c o 0 0 0 H O -7 O '-+ cn d N O m e1 U Q M ^' m H a% 3 z W ~U qV Vja I I I I J 0 ON 0 0 O 0 0 z Z O O � N O e1 O N O .r W U f Q ul s °° a a0 ate' y fza - V I UUU I 1 I I II.. -F O O O 0 Z o 0 0 0 0 W W F- 0 O N .r p O� O u1 .T O Z Q D` F-V WW ?7z 1 1 1 I a .. .4 r La J ,,► L cc m m Q O L w cc oo F" O I.- 4 4J `+ W O C M I" c a L cc m H M r-I L fA O x Q p 41 t+ u 3 W I (k) a� y m -H u G i+ 71 C 7 L L L L V J7 t N > 'cc ~ a�i .G C ° • �' W a'ri c0 P. m Ix Ey Ad d Z --: N ri '.5 -,D POLICIES AND OBJL .IVES ` GENERAL BUDGET POLICIES (continued) INVESTMENTS (continued) E. The City will invest only in those instruments authorized by the California Government Code Section 53601. The City will not invest in stock, will not speculate, and will not deal in futures or options. The investment market is highly volatile and continually offers new and creative opportunities for enhancing interest earnings. Accordingly, the City will thoroughly investigate any new investment vehicles prior to committing City funds to them. F. Current financial statements will be maintained for each institution in which cash is invested. Investments will be limited to 20 percent of the total net worth of any institution and may be reduced further or refused altogether if an institution's financial situation becomes unhealthy. r G. In order to maximize yields from its overall portfolio, the City will consolidate cash balances from all funds for investment purposes, and will allocate investment earnings to each fund in accordance with generally accepted accounting principles. r H. Ownership of the City's investment securities will be protected through third -party custodial safekeeping. L The City Treasurer will develop and maintain a comprehensive, well documented investment reporting system which will comply with Government Code Section 53607. This system will provide the Management Team and City Council with appropriate investment performance information. J. The City Treasurer will develop and maintain an Investment Management Plan which addresses the City's administration of its portfolio, including investment strategies, practices, and procedures. CAPITAL FINANCING AND DEBT MANAGEMENT Capital Financing A. The City will consider the use of debt financing only for one -time capital improvement projects and only under the following circumstances: 1. When the project's useful life will exceed the term of the financing. 2. When project revenues or specific resources will be sufficient to service the long -term debt. B. Debt financing -will not be considered appropriate for any recurring purpose such as current .. operating and maintenance expenditures. The issuance of short-term instruments such as revenue, tax, or bond anticipation notes is excluded from this limitation. C. Capital improvements will be financed primarily through user fees, service charges, assessments, special taxes, or developer agreements when benefits can be specifically attributed to. users of the facility. Accordingly, development impact fees should be created and implemented at levels sufficient to ensure that new development pays its fair share of the cost of constructing necessary communities facilities. B -8 J -6 POLICIES AND OBJEC' ES GENERAL BUDGET POLICIES (continued) CAPITAL FINANCING AND DEBT MANAGEMENT (continued) D. The City will use the following criteria to evaluate pay -as- you -go versus long -term financing in funding capital improvements: Factors Which Favor Pay As- You -Go 1. Current revenues and adequate fund balances are available or project phasing can be accomplished. 2. Existing debt levels adversely affect the City's credit rating. 3. Market conditions are unstable or present difficulties in marketing. Factors Which Favor Long-Term Fnrmuing 4. Revenues available for debt service are deemed to be sufficient and reliable so that long- term financings can be marketed with investment grade credit ratings. 5. The project securing the financing is of the type which will support an investment grade credit rating. 6. Market conditions present favorable interest rates and demand for City financings. 7. A project is mandated by state or federal requirements and current revenues and available fund balances are insufficient. 8. The project is immediately required to meet or relieve capacity needs, current resources are unavailable, but a long -term revenue source has been identified. 9. The life of the project or asset to be financed is 10 years or longer. Debt Management E. The City will not obligate the General Fund to secure long -term financings except when marketability can be significantly enhanced. F. No more than 60% of capital improvement outlays will be funded from long term financings; and direct debt will not exceed 2% of assessed valuation. G. An internal feasibility analysis will be prepared for each long -term financing which analyzes the impact on current and future budgets for debt service and operations. This analysis will also address the reliability of revenues to support debt service. H. The City will generally conduct financings on a competitive basis. However, negotiated financings may be used due to market volatility or the use of an unusual or complex financing or security structure. I. The City will seek an investment grade rating (Baa /BBB or greater) on any direct debt and will seek credit enhancements such as letters of credit or insurance when necessary for marketing purposes, availability, and cost - effectiveness. J. The City will monitor all fortes of debt annually coincident with the City's Financial Plan preparation and review process and report concerns and remedies, if needed, to the Council. B -9 J-1 P POLICIES AND OBJE( IES GENERAL BUDGET POLICIES (continued) CAPITAL FINANCING AND DEBT MANAGEMENT (continued) K The City will diligently monitor its compliance with bond covenants and ensure its adherence to federal arbitrage regulations. L The City will maintain good communications with bond rating agencies about its financial condition. The City will follow a policy of full disclosure on every financial report and bond prospectus (Official Statement). The benefits of this policy were recently realized with the upgrade in the City's general obligation credit rating from A to A -1 by Moody's Investor Services. APPROPRIATIONS LIMITATION A. The Council will annually adopt a resolution establishing its appropriations limit calculated according to Article XIIIB of the Constitution of the State of California, Section 7900 of the State of California Government Code, and any other voter approved amendments or state legislation that affect the City's appropriations limit.. . B. Although there is no legal requirement for a public hearing, at least 15 days notice will be required before the Council considers a resolution to establish an appropriations limit. The City will generally consider this resolution in connection with final approval of the budget. C. The City will strive to develop revenue sources, both new and existing, which are considered non -tax proceeds in calculating its appropriations subject to limitation. D. The City will annually review user fees and charges and report to the Council the amount of program subsidy, if any, that is being provided by the General or Enterprise Funds. E. The City will actively support legislation or initiatives sponsored or approved by League of California Cities which would modify Article XIIIB of the Constitution in a manner which would allow the City to retain projected . tax revenues resulting from growth in the local economy for use as determined by the Council. F. The City shall seek a vote of the public to amend its appropriation limit at such time that tax proceeds are in excess of allowable limits. FUND'BALANCE DESIGNATIONS AND RESERVES A. The City will maintain fund balances of at least 20010 of operating expenditures in the General Fund as well as the Water, Sewer, and Parking Enterprise Funds. This is considered the minimum level necessary to maintain the City's credit worthiness and to adequately provide for. 1. Economic uncertainties, local disasters, and other financial hardships or downturns in the local or national economy. ` 2. Contingencies for unseen operating or capital needs. _ 3. Cash flow requirements. B -to f MEETING DATE: �ili�I��IIIII��II� city of San Luis OBISpo September 22 1 'Mono COUNCIL. AGENDA REPORT ITEM NUMBER: ' FROM: William T. HetlandAI-7�— Prepared By: Gary W. Henderson G,v41 Utilities Director Water Division Manager SUBJECT: Submittal of Plans and Specifications for "Water Treatment Plant . Modifications, City Plan No. S -39M." RECOMMENDATION: 1. Approve plans and specifications for the Water Treatment Plant Modification Project, and authorize staff to advertise for bids. 2. Approve and authorize the Mayor to execute the attached contract with Black and Veatch for an amount not to exceed $750,000 for construction support services for the project. DISCUSSION: Summary The City's water treatment plant is over 30 years old and needs major renovation. The proposed improvements will increase operational efficiency and allow the plant to meet new water quality regulations. Staff and the City's consultant conducted a pilot plant study which determined that ozone, dual media filtration, and other plant upgrades would most effectively meet requirements. The improvements are estimated to cost $10.8 million and will be funded through bond sales. This will result in a rate increase in 1994/95 of approximately 3_9o' more than originally estimated. Staff will determine the final increase after construction bids are received and bond interest rates are set. All environmental and architectural reviews have been completed. Staff is requesting authorization to bid and the approval of the construction services contract. Existing Facilities The existing water treatment plant is located on Stenner Creek Road, northwest of Cal Poly campus. The facility was constructed in 1964 to provide treatment of surface water from Salinas and Whale Rock Reservoirs. The plant was originally designed to treat up to eight million gallons per day (mgd). In 1977, the plant was upgraded to provide 11.5 mgd of treatment capacity but has actually treated up to 12 mgd for limited periods during peak water demands. The upgraded plant will be capable of treating 16.0 mgd which is consistent with the City's Water and Wastewater Element of the General Plan. The water treatment plant is a conventional plant that includes coagulation, flocculation, sedimentation, filtration, and disinfection. Currently, the plant uses chlorine as the primary disinfectant. The plant has operated successfully for nearly 30 years with only minor modifications. Much of the plant equipment, however, has outlived its useful service life. Replacement parts are expensive and are difficult, if not impossible, to obtain. The water delivered from Whale Rock Reservoir is of consistently excellent quality and requires minimal treatment. Salinas Reservoir's water quality is much more variable. This 39 1°"EMdIIIII111111 city of San LUIS OBISpo COUNCIL AGENDA REPORT Water Treatment Plant Modifications Page 2 water is generally easily treated to high quality levels except during summer months when algae blooms occur. At those times, the existing plant is unable to produce a water free of objectional tastes and odors. In addition, due to the high dissolved organic content of the algae -laden waters, the treated water will contain excessive amounts of trihalomethanes (THMs) due to the use of chlorine as the .primary disinfectant. Treatment Regulations tions Since the plant was originally built, the Safe Drinking Water Act (SDWA) was adopted in 1974 and was significantly amended in 1986. The 1986 amendments are extremely broad in scope and require implementation of new regulations by Environmental Protection Agency (EPA). For the City of San Luis Obispo, the most significant issue are the regulations aimed at reducing the formation of disinfection -by- products, specifically THMs, which are a group of compounds formed during disinfection by the reaction of chlorine with naturally occurring organics. While the City has consistently met the current 100 micrograms per liter limit, there have been occasional excursions above the 100 level. The new regulations may reduce the allowable level for THMs and will also require increased chlorine contact times which will cause THM levels to exceed the regulations. L19M T,"I A In September of 1989, the City retained Black & Veatch, Engineers - Architects, to conduct an evaluation of the City's existing water treatment plant to determine what improvements were necessary to meet the latest applicable drinking water regulations and modernize the nearly 30 year old facilities. This evaluation included inspection and review of the existing facilities and a 90 -day pilot study to investigate the use of alternate disinfectants. The purpose of the pilot plant was to investigate (1) the use of ozone and other oxidants in lieu of chlorine; (2) the possibility of bypassing the sedimentation step for water from the Whale Rock source and treating it by direct filtration; and (3) the use of alternative filter media. Water treatment processes were simulated for each source independently and for a blend of the two waters. Several different combinations of ozone and other treatment chemicals were applied and the treated water was tested for various water quality parameters including turbidity, color, and trihalomethanes. The pilot study indicated that (1) ozonation most reliably produced water free of objectionable taste and odor and met all current as well as anticipated regulations; (2) water from Whale Rock can be reliably treated by direct filtration; and (3) dual media is the most appropriate filter media choice for this plant. The use of ozone provides enhanced disinfection capability to meet federal and state requirements but will not form chlorinated by- products (THMs). Ozone will also destroy the trace quantities of algae - related compounds that have caused taste and odor problems in the past with water from the Salinas Reservoir. Lastly, ozone may aid the coagulation process under certain V4� 3'/D �����hu�IIIIIIiIIpn��Ip city of San Luis OBISPO - fflii% COUNCIL AGENDA REPORT Water Treatment Plant Modifications Page 3 operating conditions, reducing chemical utilization and extending the length of time between filter cleaning. Project Desien On July 31, 1990, the City Council was presented the results of the Pilot Plant Study and directed staff to proceed with the design based on the recommendations. A contract was executed with Black & Veatch to provide the necessary design services. The plans and specifications are now complete for the project. The project involves numerous improvements including the addition of ozone facilities. The improvements are based on the results of the predesign and pilot studies and are described below: 1. Ozone Facilities - Ozone facilities will be provided for preozonation of the incoming raw water as the primary disinfectant. Ozone facilities will be based on a total installed capacity of 750 lb /day and include air preparation equipment, ozone generators, fine bubble type ozone dissolution system and off -gas destruct system. Two ozone contact basins will be provided and include flexibility to maintain Whale Rock and Salinas waters separate or treat water from either source in both contactors. 2. Plant Influent - New plant influent piping and metering facilities will be provided to maintain the two source waters separate such that Whale Rock water can be direct filtered, and Salinas water will receive full conventional treatment. Normal operation will bypass the existing forebay. 3. Flash /Rapid Mix - New two -stage flash /rapid mix facilities will be provided on each of the influent lines for chemical addition, the first stage will be designed for alum addition, while the second stage will be designed for polymer addition. 4. Flocculation - The existing flocculation equipment will be removed and replaced with vertical turbine flocculators incorporating low speed axial flow hydrofoil impellers and adjustable frequency drives. The basins will also be retrofitted with interstage baffles to reduce short- circuiting. 5. Sedimentation Basin - The effluent launders will be fitted with horizontal baffles, and the sludge blow -down line will be retrofitted with a timer- initiated automatic blowdown valve. A bypass line will be added to allow ozonated and flocculated Whale Rock water to pass directly to filtration. 6. Filtration - The existing filters will be rehabilitated to provide for constant rate, effluent rate of flow control operation. The existing filter underdrains and media J "ll ���F��►►1111i�P�IU city of San tins 081sp0 - COUNCIL AGENDA REPORT Water Treatment Plant Modifications Page 4 will be removed and replaced with dual lateral type underdrains and dual media. The wash water troughs will be removed and replaced with new troughs mounted higher in the box. The existing surface wash system will be removed and replaced. The filter effluent piping will be removed and replaced with new larger piping and rate of flow controllers. A second wash water supply tank and pump will be provided to reduce cycle time between successive backwashes. 7. Wash Water Recovery - Ramps for equipment access will be provided into the existing reclamation basins. The existing 8 -inch gate valves will be replaced with eccentric plug valves. A package treatment plant will be provided to treat decant from the reclamation basins before it is returned to the head of the plant, thereby recycling water used for filter backwashing. 8. New Chemical Feed Systems - The existing gaseous chlorine system will be abandoned and replaced with a liquid sodium hypochlorite system. This modification will eliminate the inherent dangers associated with using chlorine gas. 9. Existing Chemical Feed System - Additional metering pumps will be provided for the alum, cationic polymer and anionic polymer systems to allow for the parallel influent operation and to serve as standbys. The existing fluoride system will also be replaced and relocated to the Chemical Building. 10. Electrical - The existing 208 volt, single phase plant power system will be upgraded to 480 volt, three phase service to all existing and new facilities. 11. Control - The filters will be provided with new programmable logic controller (PLC) based control consoles with manually- initiated automatic backwash sequencing. Control consoles will also be configured for manual operation in the event of PLC failure. One console will be provided for each of two filters. The ozone system will be provided with a PLC for automatic flow pacing of the system based on operator dosage setpoint, and for data collection. 12. Buildings - A new two -story building of approximately 7,000 square feet will be provided adjacent to the existing Administration Building. The lower floor will house the ozone air preparation equipment, the sodium hydroxide system, and storage. The second floor will house the ozone generators, a conference room, a new control room, two offices, and lunch room. Construction Management and Inspection The management of a project of this scope requires specialized experience in numerous areas of construction and water treatment plant operation. This specialized experience necessitates contracting with a qualified consultant with proven experience in these areas. The consulting firm of Black and Veatch performed the pilot plant study and prepared the city 4 san Luis oBispo l COUNCIL AGENDA REPORT Water Treatment Plant Modifications Page 5 plans and specifications for the project. They have also recently completed a project at the existing Martinez water treatment plant which upgraded the facilities to ozone treatment. The Martinez project was very similar to the improvements recommended at our facilities. The project will require extensive management and scheduling to maintain the water treatment capabilities during construction. Black and Veatch will provide full time onsite inspection services as well as office support to insure full compliance with the plans and specifications. City staff does not have experience with ozone generation equipment and other relate facilities which are included in the project. The consultant will provide startup training for the new plant and schedule training with the system manufacturers following project completion. CONCURRENCES: The City Council adopted the resolution certifying the'environmental impact report which was prepared for the project on November 5, 1991. This project was reviewed by the Architectural Review Committee and received their final approval on July 6,1991. FISCAL IMPACT: The total projected cost for this project is $10,842,700 summarized as follows: Construction $9,107,000 Project Management and Inspection 7507000 Contingencies @ 1017o 985.700 $10,842,700 The "Water Treatment Plant Modifications and Ozone Pilot Study" completed in June 1990, estimated the construction cost to be $7,635,000. The revised estimate for the project is $9,107,000. There are a number of reasons for the increased estimated costs as listed below: 1. The original construction schedule assumed that construction would begin by April 1991. Due to numerous delays, various component costs have increased. 2. The preliminary estimates were not based on detailed plans and information concerning specific onsite conditions. For example, site work was more extensive than originally anticipated. 3. After discussions with PG &E, it was determined that the City could save approximately $16,000 per year for energy by purchasing a transformer as part of the project and receiving higher voltage from PG &E (ie. primary service). J'/S 1 , . ����►�a�i�illllf�pn�u►��III city Of San WIS OBiSpo i COUNCIL AGENDA REPORT Water Treatment Plant Modifications Page 6 4. In 1990, there were four major manufacturers of the ozone equipment necessary for this project. Since that time, these four companies have merged into just two companies. Due to the lack of competition, equipment costs are anticipated to increase. Project Financing: As outlined in the 1991 -93 Financial Plan and our recent water rate review, it is anticipated that this project will be debt financed consistent with the City's Capital Financing and Debt Management policy (page B -8 through B -10 of the 1991 -93 Financial Plan). There will be no immediate impact on rates as a result of this project since debt service payments will not begin until at least 1994 -95 based on the following project schedule: Approve Plans and Specifications September 22, 1992 Award Bid January 1993 Secure Financing and Begin Construction March 1993 Complete Construction and Begin Debt Service November 1994 Debt service on this project was included in the five year water rate review presented to Council on June 2, 1992; however, it was based on a project cost of $7.6 million rather than the $10.8 million currently anticipated. This will result in annual debt service requirements that are approximately $200,000 more than projected at that time. If all other assumptions remain valid, this will result in a rate increase of 3% more than originally projected for 1994 -95. It will not be possible to determine the actual impact on rates until the construction cost and interest rates have been determined. Project Timing: Although this project may cost more than originally projected, the timing is excellent for a project of this type for the following reasons: ■ Construction bids should. be very competitive based on recent bids received on a similar project. ■ Interest rates are at a twenty five year low. Combined with the need to make these improvements, these two cost factors support going forward with this project at this time. Attachments: 1. Consultant Contract r Plans and Specifications are available for review in the Council office