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95-253
Resolution No. 95-253 RESOLUTION AUTHORIZING EXECUTION OF AN AGREEMENT WITH HEY AND ASSOCIATES, INC. BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY OF ELGIN, ILLINOIS, that Richard B. Helwig, City Manager, and Dolonna Mecum, City Clerk, be and are hereby authorized and directed to execute an agreement on behalf of the City of Elgin with Hey and Associates , Inc . for a comprehensive storm water management plan for Tyler Creek, a copy of which is attached hereto and made a part hereof by reference. s/ Kevin Kelly Kevin Kelly, Mayor Presented: December 6, 1995 Adopted: December 6 , 1995 Vote: Yeas 7 Nays 0 Attest: s/ Dolonna Mecum Dolonna Mecum, City Clerk in r-- r o (i) - � 44* Agenda Item No. 9 , November 20, 1995 TO: Mayor and Members of the City Council FROM: Richard B. Helwig, City Manager SUBJECT: Engineering Agreement for the Preparation of a Tyler Creek Management Plan PURPOSE The purpose of this memorandum is to provide the Mayor and members of the City Council with information to consider the entering into of an agreement with Hey and Associates, Inc . , for the preparation of a Tyler Creek Manageiront Plan. BACKGROUND At the Committee of the Whole meeting on June 14 , 1995 , City Council accepted the Tyler Creek Storm Water Detention Analysis report prepared by Hey and Associates . Among the several conclusions and recommendations contained within the report was the recommendation to proceed with the development of a comprehensive storm water management plan for Tyler Creek. In accepting the report, City Council directed staff to proceed with requesting proposals for the preparation of the comprehensive management plan for Tyler Creek. On September 5, 1995, Requests for Proposals (RFP) were issued to three engineering/environmental firms . A copy of the RFP issued by the City is enclosed as Attachment . 1 . Proposals were received on October 6 , 1995 from two firms : . Hey and Associates, Inc. . Christopher B. Burke Engineering, Ltd. A staff Selection Committee evaluation of the two proposals was conducted during the week of October 9, 1995 . The Selection Committee' s evaluation resulted in a tie vote between the two firms . Tyler Creek Management Plan November 29 , 1995 Page 2 In order to break the tie, both firms made qualifications - proposal presentations to the Storm Water/Flood Plain Task Force Committee, chaired by Chief John Henrici, on the evening of November 1 , 1995 . The Committee recommended the acceptance of the proposal received from Hey and Associates . A copy of the Memorandum of Record prepared by the staff selection committee, as well as copy of the recommendation received from the Committee is enclosed as Attachment 2 . Two excellent proposals were received which were similar in content. The fee proposals received were structured somewhat differently. Hey and Associates provided a "base" fee with additional services at additional cost, while Christopher B. Burke Engineering provided a single itemized base fee . For similar scope of services, the submitted fees were as follows : . Hey and Associates : base fee of $125, 000 plus an additional $50, 000 for storm sewer inventory and flow analysis and one-foot contouring, for an equivalent service fee of $175, 000 . . Christopher B. Burke Engineering: base fee for equivalent service at $219 , 842 . Consequently, when similar scopes of work are compared, the fee submitted by Hey and Associates is the lowest. The proposed agreement for engineering services with Hey and Associates will be in the lump sum amount of $167 , 000 . Work will include the "base" services as identified in the scope of work plus the following additional services : 1 . Storm Sewer Outfall Inventory. 2 . Storm Sewer Analysis for Eagle Heights . 3 . Stream Bank Erosion Simulation. The engineer has agreed to incorporate one-foot contour topography, by field survey, to better define flood plain limits where the general topography of the land is flat, and where flood waters could impact existing structures . A copy of the proposed agreement is enclosed as Attachment 3 . COMMUNITY GROUPS/INTERESTED PERSONS CONTACTED Storm Water/Flood Plain Task Force. Tyler Creek Management Plan November 29 , 1995 Page 3 FINANCIAL IMPACT Funds for this project are available in Account 378-0000-795 . 92-32 , Project 339501 , in the amount of $1 , 084 ,430 to fund this agreement . LEGAL IMPACT None. RECOMMENDATION It is recommended that City Council authorize the City Manager to execute an agreement with Hey and Associates , Inc . in the lump sum amount of $167 , 000 . Respectfully submitted, /L-1-1,:V• ' n E . Henrici ire Chief fr laf1/614 fr -4u4W James L. Kristiansen Public Works Director kAGOOLLI Richard B. Helwig City Manager JLK/do Attachments AGREEMENT THIS AGREEMENT, is made and entered into this ?git1 day of PKAIOPVIZ-- , 1995, by and between the CITY OF ELGIN, an Illinois municipal corporation (hereinafter referred to as "CITY" ) and Hey and Associates, Inc . (hereinafter referred to as "ENGINEER" ) . WHEREAS, the CITY desires to engage the ENGINEER to furnish certain professional services in connection with the development and preparation of a Tyler Creek Management Plan (hereinafter referred to as the "PROJECT" ) . AND WHEREAS, the ENGINEER represents that he is in compliance with Illinois Statutes relating to professional registration of individuals and has the necessary expertise and experience to furnish such services upon the terms and conditions set forth herein below. NOW, THEREFORE, in consideration of the mutual promises and covenants contained herein, the sufficiency of which is hereby acknowledged it is hereby agreed by and between the CITY and the ENGINEER that the CITY does hereby retain the ENGINEER to act for and represent it in all engineering matters involved in the PROJECT, subject to the following terms and conditions and stipulations, to-wit: I. SCOPE OF SERVICES A. All work hereunder shall be performed under the direction of the Director of Public Works of the CITY, herein after referred to as the "DIRECTOR" . B. In general, the work will consist of the following activities and tasks : 1 . Hydrology and Hydraulic Modelling a. Existing conditions b. Hydrology ( 1) Data collection (2) Subwatersheds ( 3) Development of model parameters (4 ) Preliminary calibration (5) Final calibration (6 ) Model runs c. Hydraulics ( 1) Data collection (2 ) Development of model parameters ( 3) Model calibration • t -2- (4 ) Model runs (5) Floodplain and floodway mapping (6 ) Flood profiles d. Future Conditions Modelles ( 1) Data collection (2 ) Development of model parameters ( 3) Hydrology runs (4 ) Hydraulic runs e. Coordination 2 . Assessments a. Damage Assessments ( 1) Survey (2) Data collection ( 3) Definition of damage reaches b. Environmental Assessments ( 1) Surveys (2) Data collection ( 3) Identification of restoration opportunities (4) Assess mitigation banking c. Storm Water Management Regulations Assessments ( 1) Review of options (2 ) Review of policies (3) Development of goals 3. Stream Bank Erosion Simulation 4 . Scenarios a. Storm Water Management ( 1) Assessment of problems (2) Development of scenarios b. Evaluation of Scenarios ( 1) Data Collection (2) Development of model parameters (3) Hydrology runs (4) Hydraulic runs 5. Storm Sewer Identification a. Storm Sewer Outfall Inventory b. Storm Sewer Analysis (Eagle Heights) C. The ENGINEER will locate the surveyed cross sections to better define the limits of the flood plain at critical reaches along Tyler Creek, from approximately River Mile 4 to River Mile 6 . Critical reaches are those where a potential exists for structures to be impacted by flood waters . It is the intent to use the surveyed cross sections in these critical reaches to define the base flood elevation limits to an accuracy equivalent to the utilization of one-foot contour interval topographical mapping. -3- D. A detailed Scope of Services is attached hereto as Attachment A. II. PROGRESS REPORTS A. A detailed project schedule for the Project is included as Attachment B, attached hereto. Progress will be recorded on the project schedule and submitted monthly as a component of the Status Report described in B. below. B. The Engineer will submit to the Director monthly a Status Report keyed to the Project Schedule. A brief narrative will be provided identifying progress, findings and outstanding issues . III. WORK PRODUCTS All work products prepared by the ENGINEER pursuant hereto including, but not limited to, reports, designs, calculations, work drawings, studies, photographs, models and recommendations shall be the property of the CITY and shall be delivered to the CITY upon request of the DIRECTOR provided, however, that the ENGINEER may retain copies of such work products for its records. Such work products are not intended or represented to be suitable for reuse by the CITY on any extension to the PROJECT or on any other project, and such reuse shall be at the sole risk of the CITY without liability or legal exposure to the ENGINEER. IV. PAYMENTS TO THE ENGINEER A. The CITY shall reimburse the ENGINEER for services under this Agreement a lump sum of One hundred sixty seven thousand ($167,000 .00) Dollars, regardless of actual Costs incurred by the ENGINEER unless SUBSTANTIAL modifications to the project are authorized in writing by the DIRECTOR. B. The CITY shall make periodic payments to the ENGINEER based upon actual progress within 30 days after receipt and approval of invoice. C. A detailed hourly analysis and fee breakdown is attached hereto as Attachment C. V. INVOICES A. The ENGINEER shall submit invoices in a format approved by the CITY. Progress reports ( IIB above) will be included with all payment requests . 1 -4- B. The ENGINEER shall maintain records showing actual time devoted and cost incurred. The ENGINEER shall permit the authorized representative of the CITY to inspect and audit all data and records of the ENGINEER for work done under this Agreement. The ENGINEER shall make these records available at reasonable times during the Agreement period, and for a year after termination of this Agreement. VI . TERMINATION OF AGREEMENT Notwithstanding any other provision hereof, the CITY may terminate this Agreement at any time upon fifteen ( 15) days prior written notice to the ENGINEER. In the event that this Agreement is so terminated, the ENGINEER shall be paid for services actually performed and reimbursable expenses actually incurred prior to termination, except that reimbursement shall not exceed the task amounts set forth under Paragraph IV above. VII. TERM This Agreement shall become effective as of the date the ENGINEER is given a written Notice to Proceed following approval of CITY' S corporate authorities and, unless terminated for cause or pursuant to Article VI foregoing, shall expire on the date the DIRECTOR determines that all of the ENGINEER' s work under this Agreement is completed. A determination of completion shall not constitute a waiver of any rights or claims which the CITY may have or thereafter acquire with respect to any breach hereof by the ENGINEER. VIII. NOTICE OF CLAIM If the ENGINEER wishes to make a claim for additional compensation as a result of action taken by the CITY, the ENGINEER shall give written notice of his claim within 15 days after occurrence of such action. No claim for additional compensation shall be valid unless so made. Any changes in the ENGINEER' s fee shall be valid only to the extent that such changes are included in writing signed by the CITY and the ENGINEER. Regardless of the decision of the DIRECTOR relative to a claim submitted by the ENGINEER, all work required under this Agreement as determined by the DIRECTOR shall proceed without interruption. IX. BREACH OF CONTRACT If either party violates or breaches any term of this Agreement, such violation or breach shall be deemed to constitute a default, and the other party has the right to seek such administrative, contractual or legal -5- remedies as may be suitable to the violation or breach; and, in addition, if either party, by reason of any default, fails within fifteen ( 15) days after notice thereof by the other party to comply with the conditions of the Agreement, the other party may terminate this Agreement. X. INDEMNIFICATION The ENGINEER shall indemnify and save harmless the CITY, its officers and employees from and against any and all loss, liability and damages of whatever nature, including but not limited to Workmen' s Compensation claims, in any way resulting from or arising out of negligent actions or omissions of the ENGINEER in connection herewith, including but not limited to negligent actions or omissions of employees or agents of the ENGINEER arising out of the performance of professional services . XI. NO PERSONAL LIABILITY No official, director, officer, agent or employee of the City shall be charged personally or held contractually liable under any term or provision of this Agreement or because of their execution, approval or attempted execution of this Agreement. XII . INSURANCE A. Comprehensive Liability. The ENGINEER shall provide, pay for and maintain in effect, during the term of this Agreement, a policy of Comprehensive General Liability Insurance with limits of at least $1,000,000 aggregate for bodily injury and $1,000,000 aggregate for property damage. The ENGINEER shall deliver to the DIRECTOR a Certificate of Insurance naming the CITY as additional insured. The policy shall not be modified or terminated without thirty (30) days prior written notice to the DIRECTOR. The Certificate of Insurance which shall include Contractual obligation assumed by the ENGINEER under Article X entitled "Indemnification" shall be provided. B. Comprehensive Automobile Liability. The ENGINEER shall provide, pay for and maintain in effect, during the term of this Agreement, a policy of Comprehensive Automobile Liability Insurance covering all owned, non-owned and hired motor -6- vehicles with limits of not less than $500, 000 per occurrence for damage to property. C. Combined Single Limit Policy. The requirements for insurance coverage for the general liability and auto exposures may be met with a combined single limit of $1,000, 000 per occurrence subject to a $1,000,000 aggregate. D. Professional Liability. The ENGINEER shall carry Engineer' s Professional Liability Insurance Covering claims resulting from error, omissions or negligent acts with a combined single limit of not less than $ 500,000 per occurrence. A Certificate of Insurance shall be submitted to the DIRECTOR as evidence of insurance protection. The policy shall not be modified or terminated without thirty ( 30) days prior written notice to the DIRECTOR. XIII. CONSTRUCTION MEANS, METHODS, TECHNIQUES, SEQUENCES, PROCEDURES AND SAFETY The ENGINEER shall not have control over or charge of and shall not be responsible for construction means, methods, techniques, sequences or procedures, or for safety precautions and programs in connection with the construction, unless specifically identified in the Scope of Services . XIV. NONDISCRIMINATION In all hiring or employment made possible or resulting from this Agreement, there shall be no discrimination against any employee or applicant for employment because of sex, age, race, color, creed, national origin, marital status, of the presence of any sensory, mental or physical handicap, unless based upon a bona fide occupational qualification, and this requirement shall apply to, but not be limited to, the following: employment advertising, layoff or termination, rates of pay or other forms of compensation and selection for training, including apprenticeship. No person shall be denied or subjected to discrimination in receipt of the benefit of any services or activities made possible by or resulting from this Agreement on the grounds of sex, race, color, creed, national origin, age except minimum age and retirement provisions, marital status or the presence of any sensory, mental or physical handicap. Any violation of this provision shall be considered a violation of a material provision of this Agreement and shall be grounds for cancellation, termination or -7- suspension, in whole or in part, of the Agreement by the CITY. XV. ASSIGNMENT AND SUCCESSORS This Agreement and each and every portion thereof shall be binding upon the successors and the assigns of the parties hereto; provided, however, that no assignment shall be made without the prior written consent of the CITY. XVI. DELEGATIONS AND SUBCONTRACTORS Any assignment, delegation or subcontracting shall be subject to all the terms, conditions and other provisions of this Agreement and the ENGINEER shall remain liable to the CITY with respect to each and every item condition and other provision hereof to the same extent that the ENGINEER would have been obligated if it had done the work itself and no assignment, delegation or subcontract had been made. XVII. NO CO-PARTNERSHIP OR AGENCY It is understood and agreed that nothing herein contained is intended or shall be construed to, in any respect, create or establish the relationship of co- partners between the CITY and the ENGINEER, or as constituting the ENGINEER as the general representative or general agent of the CITY for any purpose whatsoever or to constitute an employment relationship between the parties hereto. XVIII . SEVERABILITY The parties intend and agreed that, if any paragraph, sub-paragraph, phrase, clause or other provision of this Agreement, or any portion thereof, shall be held to be void or otherwise unenforceable, all other portions of this Agreement shall remain in full force and effect. XIX. HEADINGS The headings of the several paragraphs of this Agreement are inserted only as a matter of convenience and for reference and in no way are they intended to define, limit or describe the scope of intent of any provision of this Agreement, nor shall they be construed to affect in any manner the terms and provisions hereof or the interpretation or construction thereof. -8- XX. MODIFICATION OR AMENDMENT This Agreement and its attachments constitutes the entire Agreement of the parties on the subject matter hereof and may not be changed, modified, discharged or extended except by written amendment duly executed by the parties . Each party agrees that no representations or warranties shall be binding upon the other party unless expressed in writing herein or in a duly executed amendment hereof, or change order as herein provided. XXI. APPLICABLE LAW This Agreement shall be deemed to have been made in, and shall be construed in accordance with the laws of the State of Illinois . XXII. NEWS RELEASES The ENGINEER may not issue any news releases without prior approval from the DIRECTOR, nor will the ENGINEER make public proposals developed under this Agreement without prior written approval from the DIRECTOR prior to said documentation becoming matters of public record. XXIII. COOPERATION WITH OTHER CONSULTANTS The ENGINEER shall cooperate with any other consultants in the CITY' s employ or any work associated with the PROJECT. XXIV. INTERFERENCE WITH PUBLIC CONTRACTING: P.A. 85-1295 The ENGINEER certifies hereby that it is not barred from bidding on this contract as a result of violations of either Section 33E-3 or Section 33E-4 of the Illinois Criminal Code. XXV. SEXUAL HARASSMENT As a condition of this contract, the ENGINEER shall have written sexual harassment policies that include, at a minimum, the following information: A. the illegality of sexual harassment; B. the definition of sexual harassment under state law; C. a description of sexual harassment, utilizing examples; -9- D. the vendor' s internal complaint process including penalties; E. the legal recourse, investigative and complaint process available through the Illinois Department of Human Rights, and the Illinois Human Rights Commission; F. directions on how to contact the department and commission; G. protection against retaliation as provided by Section 6-101 of the Human Rights Act (copy attached) . A copy of the policies must be provided to the Department of Human Rights upon request. P.A. 87-1257 . XXVI. WRITTEN COMMUNICATIONS All recommendations and other communications by the ENGINEER to the DIRECTOR and to other participants which may affect cost or time of completion, shall be made or confirmed in writing. The DIRECTOR may also require other recommendations and communications by the ENGINEER be made or confirmed in writing. XXVII. NOTICES All notices, reports and documents required under this Agreement shall be in writing and shall be mailed by First Class Mail, postage prepaid, addressed as follows : A. As to CITY: JAMES L. KRISTIANSEN Director of Public Works City of Elgin 150 Dexter Court Elgin, Illinois 60120-5555 B. As to ENGINEER: GARY C. SCHAEFER Vice President Hey and Associates, Inc. 627 North Second Street Libertyville, IL 60048 -10- IN WITNESS WHEREOF, the undersigned have placed their hands and seals upon and executed this Agreement in triplicate as though each copy hereof was an original and that there are no other oral agreements that have not been reduced to writing in this statement. For the CITY: ATTEST: THE CITY OF ELGIN BYMBy Dolonna ecum Richard B. Helwig 1 City Clerk City Manager (SEAL) For the ENGINEER: Dated this ZgrH day of 9�Z, $etz._ 1995 . ATTEST: )4fa . Vij (NCt7( By By 4 -Secretary Gary C. Schaefer Vice President (SEAL) ATTACHMENT A Scope of Services NOTE: The attached scope of services have been taken from the Engineer' s proposal dated October 5, 1995 i f Hey and Associates, Inc. PROPOSED SCOPE OF WORK A description of the tasks needed to achieve the objectives of the project follows. The proposed schedule for the completion of these tasks is included in Table 1. HYDROLOGY AND HYDRAULIC MODELING Existing Conditions Using the HEC-1 and HEC-2 models we identified in our earlier work as a baseline, we will prepare new existing conditions hydrologic and hydraulic models for the Tyler Creek watershed. HEC-1 will be used as the frame for hydrologic model development. The entire 40.3 square mile watershed will be simulated. We will develop an existing conditions hydrologic model which specifically accounts for depressional storage sites within the Tyler Creek watershed and allows for evaluation of explicit detention storage policies. We will calibrate this model on a preliminary basis by using historic data on discharges both from this watershed and similar neighboring gaged watersheds. Final calibration will be accomplished using the hydraulic model by comparing historic high water marks for several events of different magnitudes. We will examine four flood recurrences: 2-year, 10-year, 50-year and 100-year events. We will analyze the 1-hour, 6-hour, 12-hour, 24-hour and 48-hour durations for each of these events to be certain that the peak discharge for the watershed is properly computed for each of these events. We also will establish an existing conditions hydraulic model for the Tyler Creek watershed building on previous studies and data. HEC-2 will be the framework for this model. We anticipate that additional survey data within the City of Elgin will be needed to better define critical cross sections, the stream thalweg and control structures. All survey data will be on FEMA benchmarks. We intend to establish a detailed hydraulic model only within the existing area of Elgin's facilities planning area. Upstream areas will not be modeled in detail except to assist in determining channel storage. We will calibrate this model 13 Hey and Associates, Inc. to historic high water marks within the City. Adjustments to hydrology may be made based on this calibration. Specific tasks follow. Hydrology The following tasks will be completed in the development of the existing conditions hydrologic model. (1) Data Collection This task will include the collection and review of all pertinent data that will be required for the development of the existing conditions hydrologic model. Most of this work was completed in our earlier work for Elgin and so little time has been allocated to this task. The following tasks will be completed. • Review of existing drainage studies, reports, and models that have been developed for Tyler Creek and tributaries. • Review of copies of the most recent topographic maps and aerial photos of the Tyler Creek watershed. • Review of historical rainfall, runoff, and discharges that could be used to calibrate the models. • Study land use maps and zoning maps for the watershed. • Study soils maps for the watershed. • Perform additional field reconnaissance of the stream in the City of Elgin. New work will include walking stream reaches and inspecting bridges and culverts. Photographs will be taken of typical channel sections and key hydraulic structures (i.e. bridges, culverts and storage facilities). • Characterize existing detention storage areas. 2) Define Subwatersheds This task will involve the delineation of the watershed and the development of the base drainage area map. We will perform the following tasks. 1 4J Hey and Associates, Inc. • Delineate the watershed into an adequate number of sub-basins that will define the runoff from the watershed. Sub-basins will be delineated at major roadway crossings, storage reaches and confluences. • Field verify drainage divides that cannot be defined from the topographic maps or aerial photographs. • Develop the base drainage area map on AutoCad. (3) Develop Model Parameters The existing conditions hydrologic parameters that will be used in the HEC-1 hydrologic computer model will be computed and the base model prepared. This will include the following tasks. • Using the base model, develop the HEC-1 model schematic that will be used for the Tyler Creek watershed. • Develop a composite base map using the soils map and land use map as an overlay to the drainage area map. • Assign runoff parameters for each sub-watershed using the composite map and topographic map. Parameters to be assigned in each sub-watershed include SCS curve numbers, impervious covers, and time of concentrations. • Develop routing parameters (stage-storage-discharge curves) for existing stream reaches and storage facilities. The routing parameters will be obtained from the HEC-2 model runs, topographic maps, field surveys, and engineering plans. • Update the existing conditions hydrologic model using the hydrologic parameters and routing reaches. (4) Preliminary Calibration The existing conditions hydrologic model will be executed using the historical storms from the Data Collection Task. The computed peak discharges and runoff volumes will be compared to historical discharges in the Tyler Creek watershed and other watersheds with similar runoff characteristics. If needed, an initial calibration will be performed on the hydrologic model. 15 Hey and Associates, Inc. (5) . Final Calibration A detailed calibration will be performed for the existing conditions hydrologic model and hydraulic model. Historical discharge and stage data will be obtained for various locations along Tyler Creek. The rainfall data associated with these historical records will be obtained and input into the hydrologic model. The models will be executed and the results will be compared to the available historical data. The hydrologic and hydraulic model will be calibrated to best match the historical data. (6) Model Runs This task will involve the execution of the existing conditions hydrologic model. This also will include the determination of the critical duration of the watershed. In order to determine the critical duration event, the models will be executed for the 2-, 10-, 50-, and 100- year events for durations of 1-, 6-, 12-, 24- and 48-hours. Hydraulics The following tasks will be completed for the development of the existing conditions hydraulic model. (1) Data Collection This task will include the collection of all pertinent data that will be required for the development of the existing conditions hydraulic model. Specific tasks include collection of cross-sections, bridge data, and historic high water marks. Field survey data will be obtained at key locations to be used in the existing conditions hydraulic model. This will include 50 new channel cross-sections, and survey or verification of the existing bridges and culverts. Stationing will be established along the stream. All storm sewer outflows will be located relative to this stationing and their inverts and size will be surveyed. In addition lowest opening and finished floor elevation of 50 structures thought to be floodprone will be surveyed as described in a later section of this proposal. Finally, one-foot contours will be established for the floodprone areas by aerial photograph interpretation to facilitate mapping. (2) Develop Model Parameters This task will involve the development of the hydraulic parameters that will be used in the HEC-2 hydraulic computer model. This will include the following. 16 Hey and Associates, Inc. • Evaluate base Tyler Creek regulatory hydraulic model to determine the quality of the existing data. This will include the review of existing channel cross-sections, and existing bridge and culvert models. • Supplement the existing base model with additional cross-sections from field surveys and topographic maps. If necessary, update existing bridge and culvert models. • Assign Manning's roughness coefficients based on field inspections and aerial photographs. • Develop routing parameters for pertinent reaches along Tyler Creek. • Input data into the existing conditions HEC-2 model. (3) Calibration A detailed calibration will be performed for the existing conditions hydrologic model and hydraulic model (see Hydrology tasks for calibration) at two locations along Tyler Creek. (4) Model Runs Execute the existing conditions HEC-2 models for the 2-, 10-, 50-, and 100-year critical duration events. Compute the floodway for the reaches of Tyler Creek in the City of Elgin using HEC-2. A storage floodway will be developed for Tyler Creek. (5) Floodplain and Floodway Map Based upon the results of the model runs and aerial topography, develop an existing conditions floodplain and floodway map. The floodplain and floodway map will be developed in AutoCAD. (6) Flood Profiles Based upon the results of the model runs develop profiles for the critical duration 2-, 10-, 50-, and 100-year events. The profile exhibit will be developed in AutoCAD. Future Conditions Models We will develop future conditions hydraulic and hydrologic models that will represent fully developed conditions in the Tyler Creek Watershed. Future land use and zoning maps will be utilized to develop future land use parameters in the watershed. This information will be used to modify the existing conditions hydrologic and hydraulic models. Two future growth scenarios in the watershed will be 17 Hey and Associates, Inc. investigated. The first scenario involves the continuation of the current trends throughout the watershed. The second scenario involves the application of the growth and land development projections which substantially conform with the Elgin Comprehensive. The City of Elgin, Kane County, Gilberts and Pingree Grove Plans also will be used to develop future hydrologic parameters. This task will include the following items. (1) Data Collection Land use maps and zoning maps for the watershed will be obtained to determine the future growth pattern in the watershed. (2) Develop Model Parameters This task will involve the development of the future conditions hydrologic parameters for the two growth scenarios that will be used in the HEC-1 hydrologic computer model. This will include using growth projections and land use plan maps and zoning maps to develop the future conditions hydrologic parameters for the HEC-1 model and input of these parameters into the HEC-1 model to develop two distinct scenarios. (3) Hydrology Runs Execute the future conditions HEC-1 models for the 2-, 10-, 50-, and 100-year event for durations of 1, 6, 12, 24 and 48 hours. (4) Hydraulic Runs Input the discharges generated from the future conditions HEC-1 run into the HEC-2 model. Execute the model for the 2-, 10-, 50-, and 100-year events for durations of 1, 6, 12, 24 and 48 hours. Coordination We will coordinate with Kane County, the Northeastern Illinois Planning Commission, IDOT-DWR, and FEMA in the investigation and modeling for this study. In addition, we will attend up to six meetings with the Elgin Storm Water Advisory Committee. 18 Hey and Associates, Inc. ASSESSMENTS Damage Assessment We will inventory data available for damages from flood events in Elgin on Tyler Creek below Randall Road over the last 20 years. Additional survey data also will be needed for this task to establish lowest openings in buildings and to the elevations of structures which potentially could be subject to flooding. Specific damage reaches will be defined to assist in the development of the scenarios. (1) Survey For damage reaches along Tyler Creek within the City of Elgin, field survey finished floor of structures that may be impacted by flooding from existing or future conditions. A total of 50 structures will be surveyed. (2) Data Collection This task will include the collection of information pertaining to historical flooding in the City of Elgin. A public meeting will be held to gather data on flooding. A survey also will be sent to residents requesting data on high water marks and flood damage records. (3) Define Damage Reaches Based upon survey data and field inspection, damage reaches or pockets will be defined. These damage reaches will be used to develop future storm water management scenarios by focusing on solutions to alleviate identified problems. Environmental Assessment We will examine the existing and potential environmental resources of the Tyler Creek watershed within Elgin's jurisdiction. We will rely most heavily on existing data but will conduct limited field surveys of the entire watershed to assess vegetative diversity and wildlife habitat. Particular attention will be paid to areas which provide critical storm water storage functions or which could be restored in concert with storm water storage. 19 Hey and Associates, Inc. We also will examine the possible negative effect that different storm water management scenarios will have on these resources. The opportunity for restoration or creation of aquatic resources also will be discussed especially wetland mitigation banking opportunities. The product of this task will be an environmental assessment of the impacts of the scenarios with recommendations for policies to protect or enhance critical resources. (1) Field Surveys Vegetation A more complete and current woody and herbaceous plant list will be prepared for the Tyler Creek corridor in Elgin. Both wetland and upland plants will be recorded. General plant community maps will be prepared identifying major habitat types and quality. Areas of significant trees (24 inches DBH or larger)will be identified. Wetlands The wetland delineation performed for the earlier Tyler Creek study will be updated and expanded to include the entire Tyler Creek floodplain in Elgin. Areas of high quality habitat and areas of restoration potential will be identified. Birds A breeding bird survey will be conducted for the Tyler Creek corridor in Elgin, concentrating on non-urban lands and areas of high quality habitats. Other Fauna Observations of other fauna such as mammals and herpetiles will be performed while the wetland delineation and other surveys are being completed. Streambank Erosion The entire creek corridor will be assessed for areas of streambank erosion, both existing and potential. Photographic documentation will be prepared. (2) Data Collection In addition to performing field surveys a review of data available in federal, state and local data banks regarding the Tyler Creek corridor will be assembled and reviewed. (3) Identify Restoration Opportunities One of the key features of the storm water management plan will be the identification of ancillary benefits which can be obtained through management of storm 20 Hey and Associates, Inc. water. This task will identify areas within the Tyler Creek corridor where ecological restoration opportunities exist. Emphasis will be placed on aquatic restoration of degraded or worsening stream reaches. Streambank stability issues will be discussed. (4) Assess Mitigation Banking Based on the survey of restoration opportunities we will assess the potential for establishment of a wetland mitigation bank on Tyler Creek. Existing need and regulatory issues will be discussed. Assessment of Storm Water Management Regulations, Water Quality and Other Opportunities This task will review current storm water management regulations adopted around the region to assist in the development of up to three overall storm water management scenarios for Tyler Creek. The intent of this task is to assess the City of Elgin's storm water regulations and develop an appropriate storm water storage and release rate strategy to prevent future flood damages in Elgin and to prevent future increases in downstream flooding on the Fox River. This task also will also assess critical policies to protect the water quality and ecological health of Tyler Creek and to develop a series of goals that can be used in the development of the scenarios. (1) Review of Options This task will involve the review of current storm water management regulations in use around the region. Several storm water management regulations will be reviewed as to their applicability to the City of Elgin. This will include the of the Northeastern Illinois Planning Commission's model ordinances, Kane County ordinances, the DuPage Countywide Storm Water and Flood Plain Ordinance, and the Lake County Watershed Development Ordinance. (2) Review of Policies A review of the City of Elgin's current storm water management policies and regulations will be completed. This will include the review of the existing floodplain and detention regulations, and previous approaches to storm water management in the City. 21 Hey and Associates, Inc. (3) Development of Goals A list of goals will be developed that can be used to develop the three storm water management scenarios. These goals will incorporate the overall needs for the City of Elgin including the results from the damage, storm water management and environmental assessment. 22 Hey and Associates, Inc. SCENARIOS Development of Storm Water Management Scenarios Using the results of the damage, storm water and environmental assessments, we will meet with Elgin to develop up to three storm water management scenarios for further evaluation. The results of the previous tasks regarding flood elevations, actual and potential damages, storm water management goals and policies, and the environmental assessment will be used to develop these scenarios. It is anticipated that the scenarios investigated will focus on alternative detention release rate strategies, regional storage alternatives, and open space or greenway alternatives The following tasks will be completed. (1) Assess Problem Using the results of the damage, storm water management, and environmental assessment tasks we will assess the current problems and needs for the Tyler Creek watershed in the City of Elgin. This assessment will be used to developed up to three storm water management scenarios for Tyler Creek. (2) Develop Scenarios Three preliminary storm water management scenarios for Tyler Creek in the City of Elgin will be developed using the results from the damage assessment, storm water management assessment, and environmental assessment. These scenarios could include floodplain acquisition and preservation, structure acquisition, structure floodproofing, regional floodplain storage facilities, regional detention storage facilities, stream channelization and bridge modifications, and ordinance modifications. We will meet with the City of Elgin to present the three preliminary storm water management scenarios and to solicit comments. Upon approval from the City, we will proceed to the evaluation of the storm water management scenarios. Evaluation of Scenarios Using the previously established models for existing and future conditions, we will then prepare model runs for the three scenarios. As before, four event recurrences for five durations will be analyzed for 23 Hey and Associates, Inc. existing and future land uses. The results of these runs will be used to develop study conclusions and recommendations. (1) Data Collection If not already collected, any additional data required for the development of the proposed conditions models will be obtained. (2) Develop Model Parameters The hydraulic and hydrologic parameters of the scenarios will be developed for both the HEC-1 and HEC-2 models. This will include parameters for the various scenarios that include the proposed storage facilities, channel modifications, bridge modification, and ordinance changes. (3) Hydrology Runs The proposed HEC-1 models will be executed for the 2-, 10-, 50-, and 100- year events for durations of 1, 6, 12, and 24 hours. The models will be run for both the existing and future land use conditions. Storm Water storage strategies will be explicitly represented. (4) Hydraulic Runs The proposed HEC-2 models will be executed for the 2-, 10-, 50-, and 100- year events for durations of 1, 6, 12, 24, and 48 hours. The models will be run for both the existing and future land use conditions. 24 Hey and Associates, Inc. REPORTS The final report for this work will consist of two documents. Floodplain Mapping Report The first report will be the flood profiles and mapping resulting from the existing and future conditions hydrology and hydraulics studies. This will be a separate document which the City of Elgin can use to regulate floodplain and floodway development within the Tyler Creek watershed. Storm Water Management Report The second report will contain the assessment of damages, the benefit-cost evaluation, the evaluation of storm water management strategies, storm water management goals and the environmental assessment. The results of the three scenarios selected for analysis will be discussed. It also will contain the conclusions and recommendations for the entire project, the suggested revised storm water management ordinance language, along with a preliminary cost estimate for recommended solutions. 25 Hey and Associates, Inc. POSSIBLE ADDITIONAL SCOPE OF WORK ITEMS The possible additional scope of work items include the development of one-foot contour interval topographic mapping, storm sewer outfall inventory, storm sewer analysis, definition of stream bank erosion problems, and water quality modeling with XP-SWMM. A description of each task follows. The proposed schedule for the completion of the items is included in Table 2. not on G©vv-i-r cP --- e e-foot Contour Interval Aerial Topographic Maps One foot contou ••terval aerial topographic maps of the Tyler Creek steam corridor v,vjj1,-156 obtained for Tyler Creek from the con' .ence of the Fox River to the facilities planning g�area-boundary. These maps will be supplied in a digital format •.t is compatible with AutoCAD. .. aerial topographic map will be used to developthe base mapfor the strew sat will be used o el�tf ineate the floodplain. �� P The one foot contour interval topographic • : .s also will b- ed to develop the stream cross-sections that will be used in the HEC-2 me - . These cross sections will be splemented with survey data to help define the channel ge• etrics, channel flowlines, bridges and culverts. • • h the one foot contour interval aerial to..: aphic map additional channel cross sections can be included in t - odel to better define t - ream. In addition, as many as 25 fewer surveyed cross sections will be requires ' ce the ••. orit of the data will be obtained from the topographic maps. Storm Sewer Outfall Inventory An inventory will be performed to document the location, size and condition of all storm sewers along the stream in the study reach. No hydraulic or hydrologic analyses of the outfalls will be performed as part of this task. The following tasks will be completed for the inventory. (1) A reconnaissance will be performed for Tyler Creek from the Fox River to the facilities planning area boundary to locate and document all the storm sewer outfalls. This will include locating and photographing all storm sewer outfalls along the study reach. The size and condition of the 26 Hey and Associates, Inc. outfall also will be noted at this time. the inventory will be coordinated with other stream or field reconnaissance work. (2) A survey of the invert elevations for all the noted outfalls will be obtained. The survey of the outfalls will be coordinated with the field survey for the cross-section stationing. (3) A storm sewer outfall inventory report will be prepared that includes the station, size, invert elevation, condition and photograph for all the outfalls. Storm Sewer Analysis This task involves a capacity analysis of the storm sewer system serving the western side of Eagle Heights. This area is served by five storm sewer lines with outfalls to Tyler Creek adjacent to Ruth Drive. The storm sewer analysis will be performed using information on the existing storm sewers provided by the City of Elgin and from our survey of storm sewer outfalls. The performance of the storm sewer system will be evaluated using storm sewer sizing calculations for the 2-, 10-, 50-, and 100-year flood events and the City of Elgin design requirements. If problems with the existing storm sewers are identified, corrective measures will be recommended. Definition of Streambank Erosion Problems As a watershed urbanizes the volume of runoff to receiving streams inevitably increases. Prior to development a stream has typically adjusted itself to convey a certain rate of discharge within its banks. This rate is typically referred to as bankfull flow and occurs about once every one or two years. If controls are not placed on the increased runoff volumes, bankfull flow may occur five or six times per year instead of once or twice a year due to the increased runoff rates and volumes. As a result of these stresses, a stream may attempt to increase its ability to convey these flows by increasing its cross sectional area. This can lead to streambank erosion and sediment deposition problems in downstream pools and receiving waters. 27 Hey and Associates, Inc. One means for examining the significance of this problem in a watershed is to mathematically simulate the runoff process as urbanization increases. The increase in pre-development bankfull flow recurrences can be determined along with the affects of these increases on specific stream sections. The effectiveness of runoff control measures also can be evaluated. An example of such a study is the Northeastern Illinois Planning Commission's report to the Illinois Division of Water Resources entitled "Evaluation of Storm Water Detention Effectiveness in Northeastern Illinois, 1989". As an alternate task for the Tyler Creek Study, we would prepare such an evaluation. First we would use XP- SWMM, the HEC-1 and HEC-2 model parameters describing the stream and its watershed and the Elgin long term precipitation gage network to develop a simulation of the hydrology of Tyler Creek prior to the waiver of detention. Next we would use the same process to simulate current hydrology. We would then calculate bankfull flow rates at critical cross sections prior to the detention waiver. The number of times these flows are exceeded under current conditions would then be counted and an assessment of impact prepared. Finally, detention control measures to manage these increased rates and volumes would be tested with future watershed land use conditions. no ivy Cov1, ` 061C+ • er Quality Modeling with XP-SWMM In an effort to assess -- quantities and effects of storm water runoff pollutant loads to Creek we would prepare an estimate of these :•ds using XP-SWMM as an alternate tas ► e would use the HEC-1 parameters from our earlier tasks and t - •nom term Elgin precipit. gage record to generate annual and event estimates of pollutant loads. We would us- •e E can Concentration method approved by the USEPA as part of its Nationwide Urban Runoff gram i' ') to calculate pollutant loads. No decay of pollutants or transport would be mod , Just loads to Tyler Creek reviously defined subwatersheds. We also would simulate the tiveness of best management practices such as etention and constructed wetlands based on PA NURP and National Wetland Database research results. Thep ct would be an estimate existing and future pollutant loads and the potential reduction of these by best ma ment actices. 28 ATTACHMENT B Project Schedule Hey and Associates, Inc. Table 1. Part A-Proposed Schedule-Additional Scope of Work Tyler Creek Management Plan-Phase One Schedule months from authorization to roceed Task ©©fl© 6 QQ 9 10 ® Existing Conditions ::i:iv::.v :};iif:.::�:i:�:i�:::i.?,:vv<v iiiiiiiiiiiiii Future Conditions li.Z.:A:. .!::::i:..: Damage Assessment 11111111.,...iit;: 1E1E111. ' s: : ;:;:::::;::::11.1111..■. :11 Environmental Assessment ............... :< i.iil r Management Stormw ate Ma a ement Assessment : 11.1191.11.11111. 11 Develop ScenariosIII 11111 .:•Model Scenarios IIIIIIIII <'''<>! % !.: •;1111:. U II Coordin ti n •1r!!:II. .� r: '..: .:11:11 :. ig:Floodplain Mapping Report 1111111r:.i:i?.11111111 :11::::;:,:•,;::11.< Stormwater Management ReportIIIIIIIIIIIII ,;::R> Hey and Associates, Inc. Table 2. Part A-Proposed Schedule-Additional Scope of Work Tyler Creek Management Plan-Phase One Schedule (months from authorization to proceed) Task 1 2 3 4 5 6 7 8 9 10 11 12 •.• flak. • 6,1 pxa2C.5 .1}• -..—.Y.........,...._...�_.,........,..e... o.......-....._ tix:•`YV`�ti:::xr•.rti:+'�.c;•.a:.S`•:o..•+�2:::•:u+'wk:Ca:• l GOv1 f ruc/ tit;titifkt,ke, Storm Sewer Analysis Storm Sewer Inventory Continuous Erosion Simulation Wv••�' t :`;a;,,}}}} O.ic-FOOL ontyur 1 .,a; IM + ATTACHMENT C Lump Sum Fee Calculations 4 1 Hey and Associates, Inc. INTRODUCTION As stated in the Request for Proposal, we have provided our labor estimates, schedule, and costs in the Part B of our proposal. These data are organized into tasks, man-days, and personnel classifications as requested. We have provided labor estimates as man-days instead of man-hours since the conversion is straight forward. LABOR ESTIMATE Table 1 presents the labor estimates for the scope of work described in the request for proposal. Table 2 presents the labor estimate for possible additional work tasks. SCHEDULE Table 3 presents the proposed schedule for the project. A total of twelve months is scheduled for completion of the scope of work in the request for proposal. Table 4 presents the scope of work for the possible additional tasks. The length of time required to complete these tasks varies from two months to six months. COST A total fee of$125,000 is proposed for the basic scope of work for the project. Additional project tasks are itemized in Table 2 and Table 4. 1 Hey and Associates, Inc. Table 1. Part B - Labor and Direct Cost Estimate Tyler Creek Management Plan - Phase One page 1 of 3 Labor in Man-Days Task Project Senior Engineer Ecologist Draftsman Technician Clerical Survey Manager Engineer HYDROLOGY AND HYDRAULICS === Existing Conditions -11.1 Hydrology Data Collection 1 1 11 Define Subwatersheds 1 2 5 Develop Model Parameters 1 3 Model Runs(20 total) 0.5 1 2.5 0.5 Preliminary Calibration 1 1 2 Final Calibration 0.5 1 2WI Hydraulics Data Collection 1 1 1 Survey(50 new cross sections and 15 controls) 1 1.1 $10000 Develop Model Parameters 1 2 Calibration 1 1 3 2 Model Runs(20 total) 0.5 1 2 1 Floodplain and Floodway Map 0.5 _ 1 2 5 2 1 Flood Profiles 0.5 1 2 5 1 1 Subtotal 6.5 13 24.5 0 15 13 8.5 $10000 Future Conditions Hydrology Data Collection 1 1 2 1 1 Develop Model Parameters 2 4 2 1 Hydrology Runs(20 total) 1 1 2.5 0.5 Hydraulics Runs(20 total) 1 1 2 =_ Subtotal 3 5 10.5 0 0 IIM 3.5 $0 .... Hey and Associates, Inc. • .... / - Table 1. Part B - Labor and Direct Cost Estimate Tyler Creek Management Plan - Phase One page 2 of 3 Labor in Man-Days Task Project Senior Engineer Ecologist Draftsman Technician Clerical Survey Manager Engineer . . . ASSESSMENTS Damage Assessment _ Survey $3000 Data Collection 1 1 20 5 Define Damage Areas 1 1 Subtotal 0 2 3 0 0 20 5 $3000 Environmental Assessment _ Field Surveys Vegetation 1 Wetlands 1 Birds 1 Other Fauna 1 Aquatic Ecology 1 Data Collection 1 1 1 I.D.Restoration Opportunities 1 2 2 2 2 2 2 Subtotal 1 1 2 2 8 2 3 3 $0 Stormwater Management Assessment • Review of Options 1 2 2 1 1 — — Review of Policies 1 2 2 1 1 Development of Goals 1 2 2 2 1 . . — Subtotal 3 6 6 0 0 4 3 $0 Hey and Associates, Inc. It .00 Table 1. Part B - Labor and Direct Cost Estimate Tyler Creek Management Plan - Phase One page 3 of 3 Labor in Man-Days Task Project Senior Engineer Ecologist Draftsman Technician Clerical Survey Manager Engineer SCENARIOS . . Develop Scenarios • Assess Problem 1 1 1 1 1 1 Develop Scenarios 2 3 3 1 2 2 Subtotal 3 4 4 2 0 3 3 $0 Model Scenarios Data Collection 1 1 Develop Model Parameters 1 1 2 1 Hydrology Runs(60 total) 1 1 2.5 0.5 Hydraulics Runs(60 total) 1 1 2 1 • . . Subtotal 2 3 6.5 0 0 3 2.5 $0 COORDINATION AND MEETINGS 1 2 2 2 3 ... (assumes six meetings) FLOODPLAIN MAPPING REPORT 1.5 3 4 1 4 5 STORMWATER MANAGEMENT REPORT 1.5 2 3 3 1 3 4 TOTAL 1--- 22.5 42 65.5 15 19 56 40.5 S13000 Hey and Associates, Inc. 1 .., Table 2. Part B - Labor and Direct Cost Estimate - Additional Scope of Work Tyler Creek Management Plan - Phase One page 1 of 2 Labor in Man-Days Task Project Senior Engineer Ecologist Draftsman Technician Clerical Survey Manager Engineer ..---.-. .. . _.---'"-*------ • A - . . • • ' --..........,,............. e)....*....... ''.. Data Collection ---''''''''.4--..... 1 ........-----'3-- 4 1 Develop Model Parameters 0.5 3 2 1 Model Runs(existing and future) 1 ''''-....5-..„ 2 0.5 BMP Evaluation 1 2 5 -•••,_ 1 . _Report 1 2 5 ---"2"----..-...„ 2 2 • •‘,..,___ ---475.---- —..7..... —24— -....2.-- --14— —+6;;---'...--......,,, . _ STORM SEWER ANALYSIS Characterize Storm Sewer Data 0.5 1 2 3 1 Analyze Capacities 0.5 1 2 1 Map Problem Areas 1 3 1 1 Prepare Recommendations 0.5 2 2 1 .. Subtotal _ 1.5 4 7 3 5 3 Hey and Associates, Inc. Table 2. Part B - Labor and Direct Cost Estimate - Additional Scope of Work Tyler Creek Management Plan - Phase 1 page 2 of 2 Labor in Man-Days Task Project Senior Engineer Ecologist Draftsman Technician Clerical Survey Manager Engineer STORM SEWER OUTFALL INVENTORY Field Inspection 1 1 Tabulation 1 1 4 1 Field Survey 1 $5000 Subtotal 2 3 4 1 45,can CONTINUOUS XP-SWMM SIMULATION OF STREAMBANK EROSION Collect Data 0.5 1 3 3 Prepare XP-SWIviM Parameters 0.5 2 5 2 Model Runs(3 total) 1 2 5 2 _ Impact Assessment 1 1 2 1 Develop BMPs 1 1 2 2 Report 1 1 5 2 1 2 Subtotal 5 8 22 2 11 2 ONE-FOOT CONTOUR.-NFArS- — ——' TOTAL Hey and Associates, Inc. Table 3. Part B-Proposed Fees and Schedule Tyler Creek Management Plan-Phase One Total Schedule Fixed months from authorization to roceed Task Cost Q©©ni© 6 0 8 9 10 ®® Existing Conditions $45,000 Future Conditions $12,000 ... ?''....... Damage Assessment $12,000 ....,I?i:. ?> <>..■.. Environmental Assessment 8,500111111111111 Stormwater Management Assessment ssment $ 11,000 Develop Scenarios $ 9,000 ,.......' ' . :.■I Model Scenarios $ 8,000 111111111111T;::.:1:1;Hilli Coordination 4,500 • Floodplain Mapping Report 7,500 • P PP g Po Stormwater Management Report $ 7,500 Total Fixed Fee $125,000 1111111111111111111111111111 Or Hey and Associates, Inc. Table 4. Part B-Proposed Fees and Schedule-Additional Scope of Work Tyler Creek Management Plan-Phase One Total Schedule Fixed months from authorization to roceed Task Cost ©©©fl© 6 Q 8 9 10 m® Storm Sewer Analysis $10 00011111111111 Storm Sewer Inventory $9,000 1111111111111.1111 .............. Continuous Erosionl im n S uatio $23 000 Total Fixed Fee ....■.