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275495 M�NITE -.CITV CLERK CQUI1C11 �54�5 P`KIK . +�FINANCE GITY OF S.�INT PAUL CANARV - DEPARTMENT - BLUE - MAVOR File NO. o�u cil solution Presented By Referred To Committee: Date Out of Committee By Date WHEREAS, the Metropolitan Waste Control Commission (MWCC) has initiated preparation of the Metropolitan regional "201 Facilities Plan" under the provisions of U. S. Public Law 92-500 amendments of 1972 to the Pollution Control Act and the Clean Water Act of 1977, and . WHEREAS, the MWCC is conducting public hearing on the proposed Metropolitan regional "201 Facilities Plan" with a closing date of August 25, 1980 for submitting written comments and views, and WHEREAS, the Department of Public Works of the City of St. Paul has reviewed and developed a comprehensive report on the analysis of said "201 Facilities Plan" as it affects the City of St. Paul, a copy of which is attached hereto and made a part hereof, and WI�REAS, the City of St. Paul's report developes a Combined Sewer Overflow (CSO) Control Plan that addresses both the CSO control and local needs and concerns at a lesser cost, and WI-IEREAS, said city report expresses main points of concern to the City of St. Paul which are as follows: l. It is very questionable that the proposed "201 Facilities Plan" can be implemented without substantial Federal and State Aid funding. 2. The Metropolitan Council and the MWCC should continue to pursue Federal and State Aid funding at a level of 90°s for all projects, including the least cost CSO control. 3. The Metropolitan Council, the Minnesota Pollution Control Agency and the United States Environmental Protection Agency should support �and provide at least 25� of all Federal and State Aid funding allocated to the Metro area each fiscal year to major sewer system rehabili- tation, new collector sewers and appurtenances, new interceptors and appurtenances, and correction of combined sewer overflows pursuant to the Clean Water Act of 1977. 4. The Metropolitan Council, the Minnesota Pollution Control Agency and the United States Environmental Protection Agency should designate 24� of all Metro area "201 Facilities Plan" funding for projects associated directly with the correction of combined sewer overflows. COUNCILMEN Yeas Nays Requested by Department of: Butler Hurtt Publi ks REB zz Levine In Favo[ �` H Maddox � e McManon __ A gainst BY d x ghowalter howa r 7edesco Tedesco Form Approved by i y ne Adopted by Council:W��son Date Certified Passed by Council Secretary BY g�, /�pproved by 1�lavor: Date _ Approved by May fo Submission to Council BY - - BY MdiITE +� CITV CLERK PR1K � —+FINANCE G I TY OF SA I NT PAU L r��- Council CANARV — DEPARTMENT File NO. * • BLUE — MAVOR Council Resolution Presented By Referred To Committee: Date Out of Committee By Date Page 2 5. The MWCC should immediately review their cost allocation policies and amend them, or should create new policies, which will eliminate all existing inequities and prevent new inequities resulting from the implementation of the "201 Facilities Plan". These inequities include, but are not limited to the current policies of: a. Charging full treatment rate for stormwater conveyed to the Metro Treatment Plant, whether or not it receives full treatment. b. Charging the City of St. Paul at full treatment rate for lake overflow waters originating outside of the City of St. Paul. c. Charging St. Paul residents Sewer Availability Charges which to a large extent finance additional sewer service to developing communities. d. Charging all sewer service areas average treatment plant costs instead of actual treatment plant costs. e. Charging the City of St. Paul for infiltration into the large MWCC interceptors. 6. The analysis by the city staff has indicated discrepancies in the "201 Facilities Plan" which should be resolved. 7. The solutions selected to control CSO must incorporate the best expenditure of monies and must consider totally all of the problems associated with combined sewer systems. 8. The Statewide Priority System be modified to reflect the needs in the Metropolitan area and meet the requirements of the Clean Water Act of 1977, � NOW THEREFORE BE IT Rr^.SOLVED, that the Council of the City of St. Paul hereby accept the Department of Public Work's Report and authorizes the Department to submit said report as part of the hearing record on the MWCC Metro "201 Facilities Plan", and COUNCILMEN Requested by Department oE: Yeas HN�a�ys Butler Public Works (�B) zz Levine In Favo[ H Maddox ��A�/� 5 � e McM�non __ Against BY '� ! C�' ' add Showalter Showa r Tedesco Tedesco yyilson Form Approve by At ey Adopted by Council: Date Certified Yassed by Council Secretary BY B� flpproved by 1�lavor: Date Approved by ayor r Submission to Council BY - – — By —. WYAITE —�CITV CLERK COIl11C11 � /��y� P�,K � -�FINANCE GITY OF SAINT PAUL CANARV - DEPARTMENT t � a.�V BLUE - MAVOR File NO. Co�ncil Resolution Presented By Referred To Committee: Date Out of Committee By Date Page 3 BE IT FURTHER RESOLVED, that the Council of the City of St. Paul supports the statements of concern cited above. COUNCILMEN Requested by Department of: ��,p�� Yeas Nays Butler Hunt Public W s ( 'B)C� ozza �,Fi� � [n Favor ; n Maddox V • McMahon -- Ag8itlSt BY d x �� r �� Form Approved y ity Attor Adopt�-�iy Counc� : �`'OR Date AUG 2 � 198�� C tified P• .ed by Cou .� S retar BY blppro by 11�lavor: AvG �+ � 198� Approved by or a Submi io �o Council B "�' By Pu�p.►S�tED AUG 3 � 1980 � ' ' REVIEW OF THE MWCC METRO 201 FACILITIES PLAN , BY , CITY OF ST. PAUL DEPARTMENT OF PUBLIC WORKS August 20, 1980 ' DIRECTOR OF PUBLIC h'ORKS , Donald E. Nygaard SEWER & UTILITIES DIVISION MANAGER Daniel. J. Dunford ' SEWER ENGINEER Roy E. Bredahl, Jr. ' STUDY DIRECTORS Roger Puchreiter , Michael Knutson ' TECHNICAL STAFF Patrick Byrne . Ronald. Grant � Randal Grote Richard Hedman Harold Kastens ' Robert Lissick George Nickerson Darrell Schmidt � - CLERICAL � Catherine Kipka , 1 , 1 1 ' , � TABLE OF CONTENTS , SECTION TOPIC • PAGE I INTRODUCTION 1 ' II BACKGROUND : 1 III DEVELOPMENT OF THE METRO 201 FACILITIES PLAN 2 ' IV METRO PREFERRED PLAN FOR CSO CONTROL 3 ' V CITY OF ST. PAUL RECOMMENDED PLAN FOR CSO CONTROL 5 � SEWER OUTFALL LOCATIONS EUSTIS 7 ' MARSHALL 7 OTIS AND PORTLAND 7 , PRINCETON 8 JEFF�RSON 8 SCHEFFER 9 ' SHERIDAN 9 DAVERN 9 � " OTTO 10 RIVERVIEW ' 11 , SMITH AND CHESTNUT 11 ST. ANTHONY 12 I � ST. PETER � 12 DOWNTOWN 13 BROADWAY 14 , . TROUT BROOK AND PHALEN CREEK 14 URBAN 15 � BELT LINE 16 SITE 36 • 17 , VI FINANCIAL IMPACTS TO THE CITY OF ST. PAUL 18 VII RECOMMENDATIONS 18 � ' . ' ' . , TABLE OF CONTENTS 1 (Cont.) SECTION TOPIC R PAGE 1 TABLE 1 SUMMARY OF RECOMMENDED PLAN-REGIONAL ALTERNATIVES 22 TABLE 2 CAPITAL IMPROVEMENT PROGRAM-RECOMMENDED PLAN fiOTAL COSTS 24 ' TABLE 3 SUMMARY OF SITE SPECIFIC SELECTION PROCESS 25 TABLE 4 MAJOR COMPONENTS OF CSO PLANS AN� TOTAL COSTS 28 � TABLE 5 ANNUAI, COST PER HOUSEHOLD - CITY OF ST. PAUL 29 AP�ENDIX A MODIFIED SOIL CONSERVATION� HYDROGRAPH METHOD � FIGURE 1 MWCC PREFERRED PLAN FIGURE 2 CITY OF ST. PAUL RECOMBSENDED PLAN , , � , � • � 1 � ' � � , 1 1 ' � ' � , � 1 1 1 1 1 1 � l � t 1 1 1 ' I. INTRODUCTION � The City of St. Paul has been conducting an extensive review of the Combined Sewer Overflow (CSO) "Recommended Plan" presented as part of the Metro 201 , � Facilities Study� This report is intended as a summary of this review and as written input for the record of the August 14, 1980 public hearing c�nducted by the Metropolitan Waste Control Commission (MWCC) . It was not our intention , to prepare a separate 201 or CSO study. Assumptions and base data developed by the study consultant, Ganoram, for the Metro 201 Facilities Study were incor- ' porated in our review procedures so that the information generated could be � compared to the results and conclusions preserited in the MWCC study. Specific � information relating to the individual .portions of the study is available in a series of reports by the MWCC. � II. BACKGROUND The preparation of the Metro 201 Facilities Plan was initiated to abide with the requirements of the Federal Environmental Protection Agency and the Minnesota ' Pollution Control Agency. These requirements are outlined in the Federal Water Pollution Control Act of 1972 and the Clean Water Act of 1977, enacted by the ' U. S. Congress to maintain and enhance the quality of this country's water resources. The metro area discharges to the Mississippi River are currently , allowed under a Federal NPDES permit which requires monitoring and future control of these discharges. St. Paul has a total of 45 combined sewer outfalls , presently allowed under the NPDES permit. The main objective of the Metro 201 Facilities Plan is to plan what facilities will be necessary to achieve expected water quality requirements in the metro- � politan area. The plan also addresses the issue of what further wastewater services will be required to meet future development needs. This planning is � based on a twenty year study period in five-year increments and will serve as a guide for capital improvement programs and as a guide in determining grant � eligibility of various local and areawide projects. The projects must be con- sistent with the 201 Plan to be eligible for Federal construction grants. � Federal construction grants presently offer 75� funding for projects designed to eliminate pollution of the nation's water resources. The State of Minnesota generally matches the federal grant with an additional grant equal to 15� of , . the total project cost. Of the total federal funds available under this program, at least 250 of the funds allocated to a State are to be set aside for use in , non-treatment plant projects. Combined sewer overflow abatement projects fall into this 25$ set-aside category. Changes in the funding allocation process may � , . , � ' , � , , ' ' ' � � � � i 1 1 I i � substantially change the amount of grant monies available. It is therefore , necessary to consider what the implications of reduced or increased funding are as far as the ability of the cities to meet the goals established in the ' � Metro 201 Facilities Plan. . III. DEVEI�OPMENT OF THE METRO 201 FACILITIES PT�AN The Metro 201 Facilities Plan .for the Twin City Metro Area, which was begun tin 1977, includes numerous studies;� however, these can be generally grouped into three areas. , 1. Metropolitan Waste.Water Treatment Plants • 2. Metropolitan Interceptor Sewers � 3. Combined Sewer Overflows This section will not attempt to outline all the study areas, but will describe the general method utilized in determining the 201 Facilities Plan , for the Twin City Metro Area. In addition, we will concentrate on the area of the plan that will affect the City of St. Paul the greatest - the Combined Sewer , Overflow Study. To initiate the selection process, the consultant developed numerous alter- ' natives in each of the study areas which would meet the objectives of the 201 planning process. Financial as we11 as non-monitary impacts were developed ' and considered in each study area. A systemwide analysis and alternative assessment study was completed. The purpose of that study was to develop, from , a regional perspective, the best possible region wide facilities program from among the many options available. In adc3ition to developing a regional facilites � plan, the purpose of the study: was to prepare both a region wide impact assess- ment of the plan and a realistic implementation program. To develop the best regional alternative, four alternatives incorporating , seven themes were considered: 1. Subregional Consultant Recommendations � Minimum Total Annual Equivalent Cost 2. ,Minimum O & M Cost . 1 Minimum Energy Consumption 3. Mi.nimum Environmental Impacts Minimum Land Required ' . 4. Maximum Reliability Following evaluation and presentation of the four basic regional alternatives, , a regional alternative was developed which incorporates the "best" features from the first four alternatives. This is the Preferred 201 Facilities Plan ' which is outlined in Tables 1 and 2. The total capital cost of the plan is estimated at $664 Million, with annual equivalent costs totalling $73,358,000. 1 . -2- � , ' , ' � , � , ' � i 1 t 1 1 ! 1 1 � The greatest concern to the City of St. Paul in the recommended Metro 201 � Facilities Plan is that area that deals with the control of combined sewer overflows. Therefore, the remainder of this report will describe the Metro- � � politan Agencies Preferred CSO Plan, the city's analysis of this plan, the i.mpacts of this plan on the City of St. Paul, and our recommenda�ions for the modification of the Metro plan. ' � IV. METRO PREFERRED PLAN FOR CSO CONTROL The Metro CSO Study pursued three major goals: , 1. To develop a cost effective plan which, when implemented, will minimize • detrimental impact of combined sewer overflows on the river environment. , 2. To recommend a plan for modifying existing interceptors or regulators and constructing new interceptors to ensure that future waste flows will � not exceed interceptor capacity. 3. To identify those portions of the sanitary collection system that are subject to excessive infiltration and inflow and to develop a plan for , reducing it to maximize available interceptor capacity. Two additional goals were identified during the initial stages of the study: 1 4. To incorporate in the plan interceptor modifications directed towards improving system reliability. � 5. To coordinate the recommended plan with local community projects and planning. � The primary goal of the CSO Study was to identify a cost-effective means of controlling CSO discharges in the Twin Cities area to meet acceptable water quality standards. To assist in this determination, four water quality control � levels were selected as criteria for evaluating the effectiveness of control. These were: � Removals Level Use Criteria Fecal Coliform Suspended Solids 1 Aesthetics N.A. 30$ � 2 Aesthetics & Secondary Contact 75$ 30g 3 Aesthetics & Primary 1 Contact 95� 30� 4 Aesthetics & Primary Contact � Secondary Treatment 95� 70� Water quality control level three was selected as that desired level of con- Itrol. It was felt that any less degree of control would not satisfy river quality requirements for the recommended river usage. Any higher level could � not be justified on a river use, river quality or marginal additional cost basis. , -3- - � The alternatives studied for combined sewer overflow control were: , 1. Sewer Separation 2. Storage at 40 sites with conveyance by existing interceptors to Metro WWTP � 3. Storage at 17 sites, treatment or separation at individual outfalls 4. Regionalized storage and treatment 5. Interception with conveyance of flows to Metro WWTP ' 6. Express interceptor to intercept sanitary flow from municipalities north of St. Paul and Minneapolis before entering the combined sysi:em. , Following the alternatives development, and water quality control level ' selection, a screening of all the alternatives was accomplished to select the � recommended plan. � � Separation was identified as the most cost-effective control facility scheme � based on both capital construction costs and on equivalent annual costs. However, due to the large emphasis placed on improving reliability in the MWCC ' interceptor system, a hybrid plan was developed. This plan corresponds to the CSO alternative incorporated in the overall regional preferred plan discussed in the previous section. � One of the major components of the Hybrid CSO plan is the replacement of the Minneapolis East Interceptor, 1-MN-300. The interceptor would parallel the ' existing facility and will provide dry weather capacity, CSO control and reliability. The component cost is estimated as $33.3 Million. � Another major component is the replacement of the lower Belt Line regulator and diversion. This facility provides dry weather capacity,CSO control and reliability with a component cbst estimate of $3.6 Million. � Many of the interceptors within the MWCC system have exceeded, or will exceed their life expectancy during the planning period. It is anticipated ' these interceptors will, therefore, require rehabilitation within the planning period. There are two categories - one where the existing facility will be � paralleled by a new facility providing CSO conveyance and the other where no new parallel facility is planned. The cost of the first category is estimated � as $54.8 Million and of the second category is estimated as $23.9 Million. Another major component is sewer separation. The separation facilities , provide CSO control and often benefit local planning. Separation costs are estimated as $56.0 Million. Other facilities recommended primarily for CSO control consist of storage � and pumping facilities and are esti.mated to cost $37.0 Million. , ' -4- � � The Joint Interceptor, 1-MS-100, was identified as requiring a backup ' facility. , This facility would provide an alternate flow path extending the entire length of the existing facility. It would provide system reliability ' and some CSO flow conveyance. The estimated cost of the facility is $109 Million. Several interceptor facilities were identified by the study which were � shown to be under capacity or to have structural deficiencies, but were not directly related to CSO flows. The total estimated cost of these required ' facilities is $16.3 Million. This cost is included in the Preferred 201 Plan, � but not in the CSO control plan. � The total capital costs of the Metro Preferred CSO Plan is estimated to be $317,303,000, with annual equivalent costs of $26,917,000. This plan, as it � relates to areas in St. Paul, is presented in Figure 1. V. CITY OF ST. PAUL RECOMMENDED PLAN FOR CSO CONTROL � For the past two months, the Sewers & Utilities Division of the Department of Public Works has been conducting an analysis and evaluation of the Metro Preferred 201 Plan. Our basic goals in this analysis were to determine the ' impacts of the plan on the City of St. Paul and to detemnine to what extent this plan incorporates immediate needs in the city. As previously stated, rour pri.mary emphasis has been on the Combined Sewer Overflow portion of the 201 Facility Plan. � � To initiate this study, we discovered that it was necessary to develop some base data which has been omitted from the reports prepared by the Metro Con- � sultants, Ganoram, or was unavailable� for our use. This information was developed on a site-by-site basis for each sewer outfall' throughout the city. � The first step in the evaluation was to develop flow rates and runoff volumes at each sewer outfall. The Soil Conservation Service Curve Number Method was utilized to develop this data. A few modifications were made in � this method so that the output corresponded well with available test data from the Metropolitan Waste Control Commission (see Appendix Ap. This hydrograph ' method generates peak flows and runoff volumes based on rainfall, time of concentration, impervious fraction and soil conditions for each study area. � The 6 to 9 month storm developed by the study consultant was used as the rain- fall event in all combined sewage flow calculations. The 2,5,10 and 1fJ0 year storm distributions corresponding to the Soil Conservation Service Type II � Distribution were also run to check existing system capacities and to size required ponding facilities. , ' ' -5- . / � From the base flow data, we were able to size and develop rough cost estimates ' for several alternatives at each sewer outfall. These alternatives were based on various methods which might be employed to eliminate combined sewer overflows 1 at a particular sewer outfall. These methods include separation, local storage, local treatment and interception with new combined interceptors. We were also able to approximate present combined sewage capture, plus the � projected capture of each alternative from the base data developed. Based on the estimated cost of the alternatives and the projected treatment , costs, our alternatives were compared with the MWCC's to check for any gross 'inconsistancies. The actual present MWCC wastewater treatment cost of $474 , per million galloris was used in this report instead of the hypothetical cost for primary treatment utilized in the MWCC report. We feel that this cost � reflects the real cost to the city under the current cost allocation system and should be used as a basis for any cost comparison. In our review, we selected a recommended alternative for each site based on � cost, local needs and flexibility of each alternative. If a selection other than the least cost alternative was made; and if the difference in cost between ' the chosen alternative and the least cost alternative was substantial, only the cost for the least cost alternative was included in the CSO cost comparison. , It is believed that only the cost of the least cost alternative will be grant eligible in these cases and that the city would assume responsibility for the ' additional costs. Several major differences began to emerge during our review of the plan � presented by the MWCC for CSO controZ. Many of these seem to be the result of variation in the drainage area boundaries. Also, the more current information utilized by our staff resulted in some changes in the actual CSO control , measures which would be required. , The Eustis Drainage District is an example of these types of discrepancies. , The MWCC has indicated separation for only a portion of the area which will actually need to be separated for CSO control. By taking .the additional areas � into account, our costs for separation has risen dramatically from $372,000 to $2,864,000. However, separation is still the least cost control for combined ' sewer overflows in the Eustis area. A similar situation exists in the analysis of the Jefferson outfall. This area has been almost completely separated, yet the MWCC has allocated $1,642,000. , to provide combined sewage storage facilities. Our analysis has indicated it will cost only about $207,000 to complete separation in this•area. � The next sections will present a site by site discussion of each combined sewer outfall in the City of St. Paul. See Tables 3 and 4 for summaries. ' - -6- � • Eustis Street - NPDES SP1 , The majority of the area formerly outletting through the Eustis sewer outfall has been separated into the City's St. Anthony Park Storm Sewer System. It is � assumed that the remainder of the area will also be separ�ted into that system. The MWCC has indicated that separation is the least. cost solution to combined , sewer overflows in this area, with an estimated cost of $372,000. They have indicated that storage or local treatment at this site is not feasible. ' Our review has shown that several areas which drain to the Eustis Street combined sewer have not been indicated for separation in the MWCC plan. We �have developed a cost estimate of $2,864,000 for the separation required to , eliminate CSO's at this outfall. Our investigation concurs that treatment of this combined sewage is impractical. � Storage and conveyance with an initial construction cost estimate of $1,920,000, and with an annual treatment cost of $82,000, might be feasible. However, this � high annual cost virtually eliminates any benefit which might have been achieved with the lower initial capital cost. Also, storage site availability is very ' limited. We recommend that separation should be completed in this area and a corrected project cost should be included in the MWCC CSO Study. � Marshall - NPDES SP2, 3, 4 � The Marshall area is part of the West Kittsondale Drainage District in St. � � Paul. The NiWCC has recommended separation for this area at an estimated cost of $3,183,000. Local treatment was found to be the least cost alternative at , $2,292,000, while storage was found to be .the most costly alternative at $5,596,000. Separation was chosen over treatment for environmental considerations � along the river bluffs. Our review has indicated a separation cost of $2,984,000, which agrees well with the MWCC estimate. Our cost estimate for local treatment is $3,787,000 , and our cost estimate for storage is $5,261,000. We recommend separation for the Marshall area and believe this to be the , least cost alternative. Otis & Portland - NPDES SPS, 6 ' The MWCC has recommended separation for the Otis and Portland areas at an estimated cost of $2,419,000. Storage was determined to be feasible with an ' estimated cost of $3,720,000. ' � -7- � Our review of this area did not closely agree with the MWCC costs. We � determined the cost of separation to be approximately $3,725,000. This compares with our estimated cost for treatment at $2,916,000 and with storage , at $2,394,000. Both treatment and storage have high annual costs - $77,000 and $49,000 respectively. Local flooding and backup problems are present in portions of this area. , Until the discrepancy between our costs can be resolved, we will continue to recommend separation for this area as the least cost CSO control and as the ' best solution to local sewer capacity problems. �Princeton - NPDES SP7, 8 ' The majority of the area which fonnerly drained to the Princeton outfalls has been separated and now outlets through new stormwater pipes to the river. � The area draining to the Lincoln diversion, SP8, has been separated with the exception of rainleader connections and possibly a few isolated catch basins. ' The .MWCC has indicated separation as the least cost alternative at $1,089,000. This compares with an estimated storage cost of $1,383,000. Our estimate for the necessary separation in this area is $1,325,000. The ' cost of storage or treatment is fairly competitive at $936,000 and $1,379,000 respectively. The storage or treatment facilities would result in additional � treatment charges of from $10,000 to $20,000, however. Because of the relative closeness of costs and the additional benefits separation offers, we are � recommending separation as the preferred alternative. � Jefferson - NPDES SP10, 11 � Only a small portion of the' Jefferson area is still served by combined sewers. The existing combined sewered area totals about 42 acres. Storage is the MWCC preferred alternative for this area at an estimated cost � of $1,642,000. This compares with local treatment at $1,284,000 and separation at $2,229,000. Storage was selected over treatment because of local environ- , mental concerns. Our�review of this area has indicated that these costs •are excessively high � with respect to the actual CSO control costs for this site. We have estimated separation at $207,000, local treatment at $603,000 and storage at $383,000. � Treatment would have an additional annual cost of $9,000 and storage would have an additional annual cost of $3,500. It is our opinion that the large differences in cost are the result of � inappropriately defined drainage areas. We encourage the MWCC to review the current sewer records in that area. . , pur recommendation for the least cost CSO control in the Jefferson area is separation. _ S . -8- � Scheffer - NPDES SP12, 13 , Much of the Scheffer area is already served by separate storn� and sanitary sewers. Additional capacity has been provided in the existing interceptors for stormwater flows from a large portion of the remaining area. � The MWCC has recommended storage as the preferred CSO control measure for this area. Storage has an estimated cost of $1,197,000, which compares with , treatment at $1,122,000 and separation at $2,268,000. Storage was selected over treatment because of the greater reliability and lower operating costs ' it offers. . Our review of this area has indicated that separation may cost as much as ' $3,780,000. This� compares with storage at $1,315,000 and treatment at $1,883,000. Even though storage will cause operation and treatment costs to rise to $29,000 � annually, the cost savings is still substantial over separation for this area. We recommend storage as the least cost CSO control for this area. Sheridan - NPDES SP14 � A small area in the Davern Drainage District overflows through the Sheridan sewer outfall during periods of moderate rainfall. Some separate storm sewers Ihave been constructed, but these tie back into the combined sewer system. Because of environmental concerns, the MWCC has indicated that separation , is the best CSO control measure for this area with an initial capital cost of $1,198,000. The separation cost is higher than the initial capital cost of � either treatment at $566,000 or storage at $780,000 initial cost. Our review has indicated separation costs at $846,000. This cost compar�s with storage at $608,000 and t�eatment at $693,000. The annual operating and , maintenance costs would be approximately $8,000 for storage and $16,000 for treatment. � Because of the increased reliability, environmental concerns and minimal additional cost, we recommend separation for this area. 1 Davern - NPDES SP15 The :Davern Drainage District is a rather peculiar district with special � concerns. Sewer service is provided through separate storm and sanitary inter- ceptors to much of this area. However, the majority of the lateral sewers are still combined. The Davern Tunnel, one of the main storm interceptors, is in � . need of extensive rehabilitation if it is to continue in service. The MWCC has indicated that separation is the least cost and preferred � solution for CSO control at this sewer outfall. Thay have estimated the cost of separation to be $10,244,000. Storage has an estimated cost of $18,605,000. � . , -9- - � f our review differ si nificantly from those presented in the ' The results o 5 � MWCC report. We have estimated the cost of separation at $11,193,000, in- cluding the Davern Tunnel rehabilitation. The cost of storage has been estimated at $6,447,000. The cost of a local treatment facility would be about $3,203,000. � Annual operating, maintenance and treatment costs would run about $84,000 for storage and $65,000 for treatment. iThe cost differences for storage between the MWCC report and our review have resulted from several factors. The major increase in cost for the storage 1 alternative has resulted from the inclusion in the MWCC report of 15,000 lineal 'feet of interceptor sewer from the storage facility to the St. Paul Downtown area. We feel that the existing W. Seventh Street interceptor can be utilized � to convey the discharge from this storage facility. Furthermore, large caverns exist in the sandrock adjacent to the Davern Tunnel. It is our feeling that � storage could be developed in these caverns. It is also our opiniori that it may be feasible to construct a treatment , facility near the outlet of the Davern Tunnel. The study consultant has in- dicated that they consider this unfeasible because no site could be identified. � However, there is vacant land adjacent to the Watergate Marina, and it is our opinion that this could be utilized as a site for a local treatment facility. � Although, we recognize that some maintenance and reliability problems exist with these facilities, it is our feeling that the cost savings which could � result oblige us to consider local treatment as a definite viable alternative for this site. We recommend local treatment as the least cost CSO control measure for the , Davern Drainage District. Otto - NPDES SP16,17,18,19,20 iThis site was referred to as the Otis Avenue Site No. 34 in the MWCC report. This name is in error and Otto Avenue is the appropriate name. The existing � sewer system serves portions of the W. Seventh and the East Kittsondale Drainage Districts. - ' The MWCC has recommended separation as the least cost alternative at $9,607,000. Storage was also considered and the cost was estimated at $13,092,000. Our review has indicated that separation is the preferred alternative. For � several of the outfalls, the costs for separation, storage and treatment are comparable, hence separation was chosen because of its low mainenance and ' operating costs. � i _�o_ � The MWCC has indicated that storage for the Smith & Chestnut areas would � , total $5,239,000 as compared with separation at $12,066,000. These costs compare with our figures for storage at $5,550,000, separation at $16,660,000 and local treatment at $5,520,000. Since storage is a more reliable system ' than local treatment and since the initial costs are nearly equal, we find storage to be the preferred alternative for CSO control at these outfalls. ' With the present treatment rate structure, annual charges of $132,000 will be incurred by the city. ' St. Anthony - NPDES SP27 . The St. Anthony Hill area is presently being separated by the city as a ' multi-purpose project. This separation is designed to reduce combined sewer overflows and to eliminate critical local flooding problems. , The MWCC has included this area in Site 36. Our previous comments with respect to cost breakdowns and cost effectiveness of "Facility 36" apply again in this instance. They have developed cost esti.mates for the construction of , a local treatment facility at $5,900,000 and of separate storm sewers at $33,163,000. It is important to note that the separation cost includes the ' estimated separation cost for the St. Peter area discussed later. Since the separation program has already been initiated in this area, ' separation must be included as part of our CSO control plan. We have estimated that the cost to separate this area is $23,000,000. Our report recommends that only the portion of the total separation cost equivalent to the least cost ' alternative should be included. This cost is the $5,900,000 indicated in the MWCC report for a local treatment facility. While the study consultant has ' indicated a "Facility 36" related cost df $5,400,000 as least cost, this cost is based on percentage of flow volume contribution and not the actual costs ' related to the portions of"Facility 36"required for this sewer outfall. Since we feel this does not represent a real cost, we are including the cost of a , local treatment facility as the least cost alternative. The .city is praviding the remainder of the funds required to complete separation ' in the St. Anthony area. This will total over $17,000,000. St. Peter - NPDES SP27 ' The area includes portions of both the State Capitol and Downtown areas of St. Paul. Much of this area presently is served by combined sewers in sandrock tunnels. Many of the sewers in the capitol area are old and substantially under- , capacity to convey the runoff generated by the intense development around the Capitol in recent years. � , ' -12- 1 This area has also been included in _Site 36, by the MWCC. They have listed , a portion' of the "Facility 36" cost as least cost at $2,010,000. The other alternative listed is a local treatment facility at $3,320,000. Separation was ' considered in conjunction with separation for the St. Anthony area so no separate cost has been presented here. ' We have developed rough cost estimates for CSO control in this area as well. We estimate that it will cost $3,090,000 to separate the area, $2,600,000 to ' build a storage facility and $2,890,000 to construct a local treatment facility. Because of concerns with respect to the age and capacity of much of the existing ' system, we recommend separation as the preferred CSO control for this area. Downtown - NPDES SP28�29,29A,30,31 This area includes the Ceder/Minn/Robert and Jackson/Sibley sewer outfalls ' as presented in the MWCC report. These sewer outfalls are part of the Downtown Drainage District in St. ,Paul. ' Separate storm sewers have been constructed to provide drainage for most of this area. Most of the stormwater flow into the combined sewers comes from ' isolated catch basin connections, roof drains, parking lot drains and clear- water connections. While the city has an ordinance requiring that all roof ' drains be disconnected from the sanitary sewer and reconnected to the storm sewer within 1 year after the installation of a storm sewer, the city has not actively checked for compliance with this ordinance. This ordinance does not ' include one or two family resid�nces, however. The N:WCC has estimated that separation would cost $3,145,000 for this area ' of St. Paul. The cost of a local treatment facility was given as $4,900,000. This area was included with "Facility 36" at an indicated cost of $2,800,000. , We have estimated that the cost to complete the separate storm sewer system in this area would be $200,000. An undetermined amount of expenditure from ' private businesses would also be required to separate building storm and clearwater drains in existing buildings. We recommend separation in this area of St. Paul as the least cost CSO ' control. We would also encourage the MWCC to review their information to determine the causes of the major differences between our cost estimates. ' ' ' -13- ' � . ' Broadwa - NPDES SP32 Y ' Some separate storm sewers have been constructed in this area, however, separation is not nearly complete. A serious problem exists with the Broadway ' Sanitary Lift Station which is directly related to the combined sewer system. During periods of high flow in the Mississippi River, water may flow back into the combined sewers preventing effective operation of the lift station. This ' can be corrected by the construction of a separate storm sewer outlet to the river. The other CSO control measures would not effectively prevent this ' situation. Also, this area is the object of the Lowertown Redevelopment Project . so that any utility work that needs to be done should be done in coordination ' with that project: The MWCC has recommended that this area be included as part of the"Facility 36." They have included a cost of $1,550,000 for this portion. Separation has , an estimated cost of $297,000 and storage has an estimated cost of $400,000. Because of the problem with the present combined sewer system, separation ' has been identified as the only effective CSO control measure for this area. The current estimated cost of this project is $935,000. The difference in , the cost estimates is pro�a bly due to differing drainage boundaries. This difference should be resolved and adjustments made in the report. ' Trout Brook/Phalen Creek - NPDES SP33 This sewer outfall discharges runoff from two of the major drainage districts , in St. Paul, the Trout �rook Drainage District and the Phalen Creek Dr�inage District. These areas are rather complex. They ir.cor�orate virtually every ' land use and diverse topography. Lake Como and McCarrons Lake both overflow into the Trout Brook comained sewer sysfem. The major outlet interceptor for these systems is severely undercapacity by city design standards. A new outlet ' may be required as part of any stormwater managemen± glan for this interceptor. Separation projects have been constructed in a few areas, but for the most part, ' these tie back into the combined sewer system. The .MWCC has recom�ended tYiat this outfall be included in the Site 36 Facility. , They have indicated a cost of $3�,023,000 for this portion of the facility. This compares with their estimate for separation at $�7,286,000, and thsir ' estimate for loca]. treatr•�ent at $9,�30,000. We have estimated �hat treatment charges from their plan will amount to $611,000 annually. ' , ' - -14- ' We have developed an approxi.mate cost for separation of $39,716,000. We ' estimate that the cost to construct a local treatment facility is $10,000,000. In order to increase outlet capacity, we also considered the construction of ' two treatment fa�,ilities - one for Trout Brook and one for Phalen Creek. The Trout Brook treatment facility would have a separate outlet to the Mississippi ' River. The cost estimate for two treatment facilities is $14,818,000. We have also roughly calculated the portion of "Facility 36" which would be required for ' the Trout Brook and Phalen Creek systems. The cost is approximately $21,141,000. From our review, one local treatment facility would serve as the least cost . CSO control for these systems. While we acknowledge that these facilities . ' result in additional operation and maintenance costs, we feel the cost savings are significant in this instance and this alternate should be considered. The ' cost estimate prepared by the study consultant for treatment is the cost we are including in our report as the cost of the least cost alternative. ' The single treatment facility will not necessarily meet the other needs of the city, however. We are recommending that a treatment facility with a new ' autlet to the river be designed to serve the Trout Brook drainage area. This outlet could later provide a clearwater outlet for the stormwater ponding system being developed in this drainage district. The ponding system could be completed , by the city as needed, and as funds permit. We recommend that the Phalen Creek Drainage District be separated as part of the CSO control program. This will , provide an outlet for the Lake Phalen overflow besides providing CSO control and additional interceptor capacity. The total cost of these recommendations , is $18,981,000, with the CSO portion at ,$9,430,000. Urban - NPDES SP34 ' A substantial portion of the Dayton's Bluff Drainage District drains through the Urban Street sewer outfall. Even' though separation has been completed in some areas, these systems tie back into the existing combined sewers. An , additional concern is the decaying integrity of the existing sandrock tunnels and outlet structure. Finally, the combined sewer portioris of this system are ' well below the capacity required by city design standards for a combined sewer system. ' This is another of the areas included in Site 36 by the MWCC in their analysis. They have attributed $2,250,000 of the total"Facility 36"cost to this outfall. , This compares with their cost for separation of $744,000 and for storage at $1,240,000. ' t -15- � Our estimate for the cost to complete separation is $3,706,000. This is , substantially higher than the estimate prepared by the study consultant, however, the reasons are not immediately apparent why this discrepancy should exist. We would encourage the MWCC to review its figures with our latest sewer records to ' determine if some error has been made. � We have also estimated that the cost of storage and' conveyance for combined ' sewage from this site would be $1,823,000. This would also be approximately equal to the portion of"Facility 36"which should be attributed to the Urban ' outfall. Also, this cost would not provide the much needed sewer rehabilitation. , Because of the pressing local concerns in this area, we are recommending that ' separation be completed. Only the cost for storage, the least cost alternative, has been included in the cost total for the city proposal. Belt Line - NPDES SP35 ' The Belt Line Drainage District is another major drainage district in St. Paul. Some isolated separation projects have been undertaken in this area, but , for the most part, the area is served by combined sewers. Some local flooding problems exist in this district. ' This is the final area included in the Site 36 analysis performed by the study consultant. They have indicated an amount of $28,054,000 as the portion ' of"Facility 36"related to the Belt Line Drainage District. This compares with a separation cost of $41,323,000. No cost was identified for a local treatment ' facility. � During our review, two costs were developed for sewer separation in the Belt Line area. A cost of $42,068,�00 was estimated for separation using a tunnel ' system as the major interceptor. A sec�nd cost of $34,457,000 was estimated if separation were completed using local ponding areas. We have estimated that ' the cost of storage and conveyance is $14,823,Ob0. This is the equivalent of the portion o�'Facility 36"related to the Belt Line. Furthermore, we feel ' potential sites are available for a local treatment facility to treat combined sewage from the Belt Line system. We have estimated the cost of such a facility , at $7,113,000. From a least cost standpoint, we recommend local treatment as the best CSO control for this outfall. However, other concerns must be considered. An ' interest has been expressed by the Metropolitan Waste Control Commission in obtaining a sanitary flow equalization facility in this area. The city is ' interested in the possibility of obtaining a clearwater outlet for ponding areas ' , -16- � which may be developed in the Belt Line area. It may be feasible to design a , storage and conveyance facility which will capture the combined sewer overflows, provide storage for sanitary flow equalization, provide a clearwater outlet ' which can be used�as part of a separation project in that area of the city, and provide the dry weather flow relief which has become necessary. We feel ' that such a facility is feasible and that a cost of $14,823,000 is justified in the Metro 201 Plan for such a facility. As a multi-use facility, we feel ' that a portion of that cost should be assessed as an area benefit and not just a CSO benefit to St. Paul. Furthermore, if preliminary engineering finds it .unfeasible or impractical to construct a multi-use facility for this outfall, � we would recommend a local treatment facility as the cost effective CSO control for the Belt Line outfall. ! 5ite 36 -� "Facility 36" While many of the previous sections have dealt with portions of the facilities , proposed for Site 36 of the Metro CSO Plan, some comments need to be made on this area as a whole. These facilities were recommended by the MWCC as multi- , use facilities. They are intended to provide CSO control, dry weather flow relief, diurnal flow equalization and system reliability. While we agree with the goals of these facilities, we feel the system as presented does not , satisfactorily meet the needs of the city and is not the cost effective CSO solution. iWe have recommended facilities which provide CSO control, dry weather flow relief and diurnal flow equalization and which better meet the needs of the � city. The cost to provide a backup facility for the Minneapolis-St. Paul joint interceptor. is not reflected in the $76.4 Million CSO cost for the city. ' In order to develop a comparable and equivalent system, we have estimated the cost of constructing a second tunnel' roughly paralleling the Minneapolis-St. Paul joint interceptor. This would provide reliability approximately equal to that ' proposed by the Metro CSO Plan. The total costs of the Metro and City CSO Plans are indicated in Table 4. We feel the city plan more equitably distributes ' costs, better meets local concerns, has greater future flexibility and costs significantly less than the Metro CSO Plan. It is worthy to note that the total � cost in Table 4 include costs for system interceptor rehabilitation, joint interceptor reliability, and dry weather flow relief interceptors in addition � to the direct CSO costs. While these costs must definitely be part of an areas 201 Plan, it is questionable that they should be included as CSO control costs � We are of the opinion that this is not appropriate. � -17- - ' VI. FINANCIAL IMPACTS TO THE CITY OF ST. PAUL ' The implementation of the Metro 201 Facilities Plan promises to have a substantial financial impact to businesses and residences throughout the metropolitan area. There are two major ways the initiation of this plan could ' affect costs to St. Paul users. . The first major cost increase would result from increased sewage flows to , the Pigs Eye Treatment Plant. We have estimated that stormwater capture could increase as much as 250$, with the plan proposed by the MWCC. This would result ' in an increase of up to $900,000 per year in treatment charges based on the . present treatment rate structure. The plan proposed by the city will also ' increase St. Paul's flows to the treatment plant. It is estimated that these flows could increase by 1670. Thi�s will result in an annual cost increase of ' $550,000. However, the city CSO plan provides a clearwater outlet for Lake Phalen which will save additional treatment charges of about $285,000 to the City of St. Paul. ' Another major cost to residents of St. Paul would result from the large capital expenditures which would be required to implement either plan. The ' exact amount of local funding which would be required is difficult to determine because of the uncertainties of the extent of Federal funding and of the cost ' allocation system to be used by the MWCC. Table 5 gives the estimated cost to a household in St. Paul for the implementation of the entire Metro 201 Facilities ' Plan with different levels of Federal funding. As indicated, cost increases of $10 to $142 can be expected. One last consideration is that these costs were developed on estimated 1979 ' cost figures. With costs rising at a rate of about 10� each year, the total cost over the 20 year implementation schedule could double - along with treat- ' ment charges to the city. VII. Recommendations , Our review has brought a numb�r of concerns to light which we feel should be considered in the final 201 Plan which will be adopted. These include: ' 1. It is very questionable that the proposed Metro 201 Facilities Plan can be implemented without substantial Federal and State funding. We would ' like to emphasize that it is extremely important to keep costs at a minimum in the plan to be adopted. ' ' -18- , ' 2. The Metropolitan Council and the MWCC should continue to pursue all ' avenues for obtaining Federal and 5tate funding at a level of 90� for all projects, including the least cost CSO control. ' 3. The Metropolitan Council, the Minnesota Pollution Control Agency and the United States Environmental Protection Agency should support and provide at least 25� of all Federal and State Aid funding allocated to the Metro ' area each fiscal year to major sewer system rehabilitation, new collector sewers and appurtenances, new interceptors and appurtenances, and correction ' of combined sewer overflows pursuant to the Clean Water Act of 1977. • 4. We strongly recommend to the Metropolitan Council, the Minnesota Pollution � Control Agency and the United States Environmental Protection Agency, that 24� of all Federal and State funding allocated to the Metro area each year ; for the 201 Facilities Plan should be utilized for projects associated directly with the correction of combined sewer overflows. Of the total cost of $664 Million for the Metro 201 Facilities Plan, we feel $159 Million , is directly related to CSO control. This is 24� of the total project cost, and a proportionate share of the annual funding should be allocated towards , this portion. This will enable the construction of multi-use projects which have ' immediate health or safety problems that need attention. 5. The MWCC should immediately review their cost allocation policies and amend ' them, or should create new policies, which will eliminate all existing inequities and prevent new inequities resulting from the implementation of ' the "201 Facilities Plan".� These inequities include, but are not limited to the current policies of: a. Charging full treatment rate for stormwater conveyed to the Metro Treat- ' ment Plant, whether or not it receives full treatment. b. Charging the City of 5t. Paul at full treatment rate for lake overflow ' waters originating outside of the City of St. Paul. c. • Charging St. Paul residents Sewer Availability Charges which to a large ' extent finance additional sewer service to developing communities. d. Charging all sewer service areas average treatment plant costs instead , of actual treatment plant costs. e. Charging the City of St. Paul for infiltration into the large MWCC interceptors. ' ' , , -19- . j 6. The analysis completed by the city has indicated discrepancies in the Metro ICSO Control Plan. These discrepancies should be resolved before being adopted as part of the Metro 201 Facilities Plan. ' 7. It is questionable that the expected minor improvements to the river water quality resulting from the correction of Metropolitan combined sewer over- ' flows are equivalent to the expenditure of $159 Million. It seems that the proposed river quality standards will still be subject to violations due to background levels of the pollutants - especially after flows from , the Minnesota River enter the Mississippi River. Furthermore, the CSO � control plans recommended by both the city and the MWCC will not prevent ' combined sewer overflows from storms exceeding the 6 to 9 month CSO design storm. River quality standards for primary contact use would still be ' violated several times during a given year. 8. The solutions selected to control combined sewer overflows must incorporate ' the best expenditure of monies and must consider totally all the problems associated with combined sewer systems. As stated by the U.S. Comptroller ' General; "we believe that it is more efficient to design a single project that attacks both the pollution and flooding problems caused by combined sewer systems. . . . . .in the long run the nation would be better served by a ' policy that would help communities attack both flooding and pollution caused by combined sewers within a single project". ' 9. If the Combined Sewer Overflow Plan is adopted as part of the 201 Facilities Plan, river quality monitoring should be initiated to determine the real ' benefits of this program. � If it is ,later determined that these corrective measures are not producing the desired effects, the program should be halted and critically reviewed to determine if it should be continued, ' modified or abandoned. ' 10. If CSO control is determined to be cost effective for pollution control, ' then the CSO Control Plan prepared by the City of St. Paul is preferable over the Metro CSO Control Plan. The city's plan addresses both CSO ' control and local needs while offering a considerable cost savings. 11. Programming of all metropolitan projects involved with the 201 Facilities ' Plan should incorporate local needs. Municipalities should have a positive input in setting all project priorities and scheduling. The statewide priority system should be modified to reflect the needs in the Metropolitan , area and meet the requirements of the Clean Water Act of 1977. ' ' -20- • ' 12. The city should engage in stronger mitigative measures such as: ta. Rainleader disc�nnection from. combined or sanitary sewer systems b. Strict stormwater management requirements for all new developments ' c. Requiring detention on site for any development.with large impervious areas , ' d. Strict enforcement of the commercial building drain disconnection ordinance once a separate sewer is constructed in an area. However, these measures should be tempered with some judgment so as not ' to cause excessive expense or hardship which could prevent development � within the city. , . , . ' 1 ' ' . � ' � , ' , ' , , , -21- � • . . ' � , . Tx�� 1 (Continued) ' . . '�' Study Compon�nt ��9�� 20a Plan Alt No. O�urfptfon � Stfliwatet 1.2.1,4 Plant oxpanstatt Cor�sislent ; ' Woodbu ry t,2.3,� Int�resptor��rvic�to MWWTP providaQ; Constsi�nt nlitf to b�provid�d a�naded • ��.; lak�Elmo . Z,2.�.4 To eondue! Pfiase 2 Faciilti�s Planninq Study Consist�nt R�sidual Sblids Manaq�m�nt �' Metropolitaa W WT? 2 (narnrat(on of primary dudg�with aMegy Ccnslstent neowry and esh landfill;sslt of hutdris+d sludq� 1it tail oo�ditio��r S�neea WWTP � 1,2,4 inarwntion of sll sludg�. It ampl�exvkQ�xifts, Consist�At 1 s�asonai Isnd aPPlication Blu�Lak• WWTP ��Z�3 ��nd�pp��eation of rtabiliz�d,dewsrnst siudg�; Conaist�nt haul to metro as fail back �, Empire WWTP 1.2.3.4 La�d appltation of stabilized,dewatsnd Cansisient Y S.A.6 Plantr ��:•^eryy rocorsry Local stabilization. Lsnd application when pnctipbl�. �+�m�t Mstropo(itan Irtteresptor Systsm 1.2.3,C Various intereeptor nli�f and►�hsbilitation C�nsistsnt �' projtcts. CombinsG Sew�r Ov�rtlow Hybrld Combinatien of intarapton,stor�gs, and Consist�nt �aparatio�:dry we�th�r flow oanveyana niief . fo►Minneapolis Eut and Lower Eeltlin�tnm- oeptors;inttroepto�to give altemad tlow path for Joint Int.and paR of 1�est S�venth St.let. , off-lin�stonge;saw�r saparrtion in Soutfi St. �, P�ul and portiona of h1inn�apolis and St.Psul; '•Inbraptor rshabilitatioa. �, ' . • �' . � � ^ � ' , � - � ' :� ' , � .. • . ,� • �; TABLE 2 . CAPITAL I�tP['ti0VE11E:VT PROGRAII . • REC0,111TE�iDED PLA� TOTAL COSTS � ($�tillions) .�„ 1980 1385 . 1990 1995 ' "� t Z 3 4 6 Q 7 8 9 1d 11 12 13 ' 14 15 16 17 18 '� ��,�,a,�a iJ3 1.73 1.73 - - „� 1'R�w 1 C�ma�ain/O�rooklYn Pnlc Int. 4.26 4.27 4.27 . ' 1'+w 11 P*as()vt '� '� M�.,�111 Moa�:(:Aan+pl{n(nt. 2'82 2'92 a►.�...i„».�a ' .ss .�s � � ,�' r�...1 AS.aw►t•�n Uvws�� - .31 .31 - - Pha.�11 Mspb��un InHrapto� L 6i�'�" AY�f�M � � ,�9 .:�I � ! ls�p�OYDMi � .� •88 .B$ � . `� L��Anw Mtsrat+ta - 1.57 1.57 1S7 _ . � n�ih,�,«k �nt•�c.a+w 2.56 2.56 2.56 . • . ;+.+.cs Studp./A�r Ou�) � .3 .3 .3 -' � � �r�.�i,,.i.�+u+Cw,crol 93 .83 .93 ��,��.+�. 2.67 2.67 2.67 ' ; �rNO.r in�c�aptor .38 .38 .,.; I ' . ', RSAt S�n S.hc�lon �� IIS�t Pro�rom - 3.1 3.1 , . � Fwp�nt�Pro�.Exwpc.M�tro Reheb. 7.88 7.88 7.88 7.88 - '�^� M�trn Rsfub. = 14.0 14A 14.0 14,0 , ,� 1N�uo Aad t S�ooneary 12.5 12.5 125 12.51 11o..a+�ny ii�an 21A7 21.07 21.07 21.07 � �. � 1toMnwunt 1.33 1.33 1.33 C�w�� 8 .68 .�8 Cott«�Grwr� � 2.68 2.68 2.68 �. Rtu��•t�Siudo. - 4.85 4.85 4.85 4.85 . OJw la►�YriYT . 1.42 1.42 1.42 �� . f�+a►.E.asn�ion •1.52 1.52 1.53 1.53 , CSO: . • I� Pyry Eu� R�It�f Int�rwptp� - - -- 8,66 B.66 6.66 6.66 6.66 � low�t Et��tlln�R�li�f I�t�rteptor - 1.90 1.9C 1.90 190 lak�Gkr�4 I�t�rpptor - 3.60 3.60 3.60 . M"M�S�w�v� � - 3.93 3.93 3.94 '�� M"��'`Pa'��O^ = = �' " 5.36 5.36 5.36 5.36 5.36 5.36 5.36 5.36 Mar I In��,c�ntlon 7.30 7.30 7.30 7.30 7.30 7.30 7.30 7.30 7.30 7.30 r Int�ravtor (�o,nt) 3.85 3.85 3.85 3.85 3.85 3.85 3.8H 3.86 3.86 3.86 `� + ►hw 11 �torp� 6.07 B.07 6.07 I rn��1 "ap�r�tion 1.68 1.66 1.66 1.66 1.65 1.65 1.65 1.65 w � �^��c�vtor R�habllitstion ' E.43 8.43 8.43 8.43 8.42 8.42 8.42 8.42 6.42 g.t , � Totd Co�t 9.61 55.4 87.03 69.14 56.52 52.62 60.93 62.4553.05 2$.13 2B.59 26.59 13.93 21.42 19.77 19J7 8.4T 8.4 � 0 0 0 0 0 0 0 0 0 0 0 � o � o 0 0 0 0 . o 0 0 0 0 � , H o 0 0 0 0 0 0 0 0 0 0 � � G] 'd' �!' ul ul f� N l4 M O tll O �-i •I-1 J-� O l0 CO N N CS r-1 d' O [I' r-I O U � � r-i O U 00 Ol (� c'7 N N CO N 00 t�) tfl H � � '.T.' 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H r-d � H f� U . �ti W H P+ , � v �. � x � , � � � 0 a aQ U � + H u� cn . � WW � N U U , � � . u� rZ O �1-� +� a � � � � � � � a � ' , a � _ v a �' o � a H � z • 0 u Q i " �m z �, x ° � v � '� , � U � � Q � PO � H � � M ' W r1 Ap� . ' 2 � � � � � � TABLE 4 . ' MAJOR COMPONENTS OF CSO PLANS AND TOTAL COSTS ' MWCC HYBRID CONTROL PLAN ST. PAUL CONTROL PLAN PREFERRED METHOD RECOMMENDED METHOD ' CSO CONTROL Minneapolis $ 32,558,000 $32,558,000 St. Paul $118,502,000 1 $76,425,000 ' So. St. Paul $ 8,069.,000 $ 8,069,000 SYSTEM ' INTERCEPTOR REHABILITATION $ 78,734,000 $78,734,000 JOINT INTERCEPTOR RELIABILITY $ 38,540,000 2 $50,880,000 ' DRY WEATHER FLOW $ 40,900,000 $40,900,000 ' RELIEF INTERCEPTORS TOTAL $317,303,000 $287,556,000 ' Z Figure based table 10, P. 70 CSO Study Final Report ' 2 Portion of total cost of joint interceptor reliability is included in above CSO Control Costs for St. Paul (Site 36� � ' . 1 1 1 , � ' ' " . , '� v � vi � o rn ' U ,7r O 00 O CO f1 M .p � 'C7 V' tl) O al d' 00 � C1� N d' C' O Ol N N �� U1 •rl U • • • • v� tl1. ,_{ ' v�i •� a � � � ° ° U � N v} tir t� v> V O � � � � ' U � 3 w � � � � L2� N V U ' k . � a � CO M � � � �' N l0 l0 l0 �1 � a 'Z3 O N N V� M � � ' Ei W � cP 6� � M � 00 V N O H � v� � d� c�i� r� � a.�i U H � � � � � U , � w � � � � o �`� � �J N � � �j N N � O N � � � m a ca z `� a�i a�•°�-°� � m � °c�' .� c�i ' o w o � �+�m o rn �n �, �, �n x H H �� s� •.� � �n .� a� � � H •� rt3 rtf U1 �� O �-1 N p� U a' '� � 'Jy U �6 CO dl 1 t� rl N e�j L: .� fC H E-� �".� N }-I,.Q �I M N �O 61 rl � �O o a H z � � vro �s - . . � � �, � .'L," iQ � Ga 7v��.� W O M M i/]- V N . ' u1 a E-� W W -N Q U H fZ u) v} v} v> .,.�.� � w cn a � � � i -� � p' r� � �o o � `� pq H O H C9rn �n N � � H O �' 3 � ' U H r-I O rd U 5 4�-t c�6 � � a r� co � � � •° ' � � O O O� u�i rn �r} � � �CJ O lfl N 1 OD �}' tf) 't!) � UI �'. 61 M 0� r-I l� 61 (� � •rl CV Ol r-I r-1 � � � '�' •ri ' � � � � � \ � Rf +� �I 7�1 •ri N �r C'J r-I 1� +� 1 .� � U �i � � N � U � d� O �• rtf � a1 � M � rl M l� � 3 7H .-h '- �fl �i' [� r--I !n '.7 d-� � '-I � � � � � O � O U �0 N t0 Ul I� l4 00 .-I UI U �1 � +� 00 �-I v� v� Z7 �--I N � � �n O� N rtJ b O ' U � U � � � � � �-�1 U O O � r-1 ri O -rl 4f � � ' � rd O � ,O NE �-I U '� 'L7 t�A m U '� rtf N U � t�i� .q V � � � 1 E� � � H � � rt � � � U �C �C 4+ N uI O r-I O N �-I O N �-I N M N m U O E-� � x >+ rd pC >+ , b� +i •�I U � � a3i � a�i u�i � aa � aa v� a �n �,.�U c� r, ' APPENDIX A , Modified Soil Conservation Service Hydrograph Method ' ' The United States Soil Conservation Service has developed a hydrograph method which is intended to�be a design tool in calculating runoff rates and volumes for watersheds. A computer program based on this method was released as TR-20 by the ' SCS. Since that program was too extensive to be used on the Department of Public Works computer system, an adaptation of the concepts used in that program has been ' developed. The following information is a summary of the modified program: . The program has been designed to accept either real or synthetic cumulative ' rainfall data. The real data must be presented in the form of inches of rainfall in tenth of an hour increments. The synthetic rainfall data is developed by � multiplying the total design rainfall times the Soil Conservation Service Type II rainfall distribution. The total design rainfall for various return periods in the Twin City Metropolitan Area can be found in the National Weather Service ' Publications, Five-to-60 Minute Precipitation Frequency for the Eastern and Central United States (HYDRO-35) and Rainfall Frequency Atlas of the United States (Technical ' Paper No. 40) . The Soil Conservation Service recommends the Type Ii rainfall distribution for this area. ' The program utilizes the rainfall data to calculate incremental rainfall and the associated runoff. Runoff calculations are made in two parts. The program , considers runoff from impervious areas draining directly to the drainage system separately from runoff draining across pervious areas. . The areas draining directly ' to the drainage system are considered areas of zero detention, although small losses are included in runoff calculations. The runoff from both portions is routed sparately and then combined into a final area hydrograph. ' The effective precipitation and consequent runoff are computed from cumulative rainfall and the area curve number. The area curve number is a dimensionless ' parameter defined by the Soil Conservation Service. It is dependent on antecedent moisture, soil type and land use or percent impervious. Tables presented in Urban ' Hydrology for Small Watersheds (Technical Release 55) can be used to calculate average area curve numbers. As recommended by the Soil Conservation Service, we ' have assumed average antecedant moisture conditions and soil group B, unless otherwise indicated. S _ 1000 _ 10 CN ' Where S=potential abstraction CN=curve number ' . ' . - ' ' From the potential abstraction and cumulative rainfall, the effective precipitation , can be calculated as: . • Pe = P-0.1(S) (for impervious areas) ' Pe = P-0.3(S) (for pervious areas) • Where Pe = effective precipitation � ' P = cumulative precipitation . S = potential abstraction ' Thi$ varies slightly from the Soil Conservation Service method. The SCS method does not separate pervious and impervious areas in their calculations, using ' P = P-0.2(S) � e ' instead. Through our modelling, we feel our modifications have resulted in a much . better correlation, especially during minor rainstorms with less than 2" of total , precipitation. � Finally, the runoff from a given area can be found as: I P2 Q = e P + S • ' e Where Q = runoff P = effective precipitation � ' e � S = potential abstraction A triangular unit hydrograph is developed using the following general equations: ' T pD p = 2 + 0.6(T) ' pQp _ 484�A) (pQ) T P . ' Where TP = time to peak L1D = time increment � � (set at 0.1 hr) Tc = time of concentration ' pQ = incremental runoff A = Area �qp = peak runoff ' These equations generate an average hydrograph, but the hydrograph may not adequately ' define the runoff mass distribution for unusually shaped drainage areas. , -2- 1 Reservoir routing is done using the conventional reservoir routing equation: ' I I 2�S2� 0 _ 2�52� 0 1 + 2 + --t-- - 1 - t + 2 ' where ^ I n = Incremental inflow ' Sn = Incremental .storage t = Time increment ' �n = Incremental outflow Because of the limited program space and the relatively short channel travel . rtimes in an urban storm sewer, a simplified channel routing method was utilized. This method basically shifts the hydrograph an appropriate time increment equivalent � to the average flow time in the channel. This may be modified at a later date. The program utilized by the city will not adequately analyze flow in a pressurized � sewer system or in complex sewer networks. Calibration and verification of this model was performed usinq rainfall and runoff data collected by the Metropolitan Waste Control Commission during the summer of ' 1977. The MWCC monitored rainfall, runoff rates and pollutant loadings on a real time format for 10 test areas in the Twin Cities. Test areas 5,6,7,8 and 10 were , located within St. Paul. It was decided that insufficient information was available for Test area 6 to make it useful in the calibration process. The drainage areas , were redefined by city staff using topographic mapping for these areas. The September 21, 1977 storm was utilized to verify the calibration of the model which ' was performed utilizing the remaining storms. The results are presented in the following diagrams, as are the drainage area , boundaries. We feel a good correlation between actual and modelled runoff has been achieved using this model. It seems unusual that the drainage areas and percent impervious developed for our ' calibration did not agree very closely with the data used by Ganoram to calibrate the SWMM model as presented in their Interim Report on Quantity and Quality ' Calibration/Verification of the EPA SWMM Runoff Model. The Ganoram calibration was done utilizing many of the same areas and storms. It would be interesting to ' meet and discuss these differences at some later date. a ' ' ' ' -3- A ��C'�/ �� . � _0 3��;�� '� ��; \. %.. � . • �.� 091 • _ F� ' /� J , o � w.7. : � ��,�Z" ' � � ae� . ry ^i e� + * V� 3 ,-,i,3/._�! �i� ? ��A ti �(�� 4. ��'.s � � � � ( a ` �� . � � I��~ � I �. 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