R2017-26 Agreement with Crawford, Murphy & Tilly for Lost Bridge Inflow & Infiltration Reduction

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2/17/2017 Item Coversheet City staff reviewed the proposals and interviewed AECOM, CMT and RJN Group. Staff recommends Council approve a Professional Engineering Service Agreement with Crawford, Murphy and Tilly, Inc. as the firm best qualified to perform the work. Inflow and Infiltration (I&I) Reduction Program An I&I reduction program will develop alternatives and provide associated costs to eliminate I&I to reduce the threat of SSO's and/or basement backups from occurring. The program includes the following to assist the City in identifying the problem. 1. System Review—Consultant will review existing system. 2. Public Meeting—Consultant will provide public meetings to engage the public to assist the City in identifying local problems and to provide input on proposed solutions. 3. Closed Circuit Television (CCTV) Review—Review CCTV for defects and I&I 4. Manhole (MH) Inspection and Review—Provide MH inspections for defects and I&I. 5. System Modeling—Build, calibrate and verify a computer sewer model for both the Lost Bridge North and Florian Basins. 6. Smoke Testing— Provide smoke testing as needed to find sewer defects in need of repair. 7. Dye Flooding— Provide dye flooding to find cross connections and I&I. Dye flooding consists of surcharging storm sewer/ditches with dye colored water and investigating the sewer for dye infiltration points. 8. Private Property Inspection— Inspect private properties for drain, gutter, foundation drain, or sump pumps connected to the sanitary sewer. Inspection will require authorization from the homeowner to enter property. If authorization is not granted by the property owner the City will not be able to complete the inspection and an alternate approach will be needed. 2017 Target Area Flow Monitoring Services A separate professional services agreement is recommended with ADS Environmental Services as the firm best qualified to perform the work. ADS Environmental Services is a flow meter and rain gauge manufacture that also provides full turnkey monitoring services. The flow monitoring and rainfall monitoring is a critical component for system modeling, calibration, and validation. Florian Basin The Florian Basin limits are as shown in Exhibit A, the basin includes approximately 4 miles (21,120 feet)of sewer and 90 manholes serving 470 parcels. Lost Bridge North Basin The Lost Bridge North Basin limits are as shown in Exhibit B, the basin includes approximately 8.5 miles (44,880 feet) of sewer and 171 manholes serving 470 parcels. Professional Service Agreement The professional services provided by CMT will develop and evaluate the alternatives to eliminate excessive inflow and infiltration in the basin causing wet weather overflows and property backups. The project will address where the excess water is coming from, how much is coming in, and estimate costs to remove or store. The project's report will be the basis for a final design. The cost for the Lost Bridge North Basin and the Florian Basin Inflow and Infiltration Project is not to exceed $723,008. The price includes a $34,430 contingency. A contingency is requested to allow staff to address any work not budgeted for but may be required to meet the ACO deadline and EPA comments. After completion of the I&I Project Report, a separate professional service agreement for final design will be brought to the City Council for approval. SCHEDULE: The services approved in this agreement will start in February and be completed by the end of August 2017. The City must follow an aggressive schedule to meet the ACO December 31, 2018 deadline. PRIOR COUNCIL ACTION: August 21, 2015—City Council approved Resolution R2015-109 authorizing execution of an Administrative Consent Order between the City and the United States Environmental Protection Agency(USEPA) https://decatur.nowsag enda.comlag endaWeb(Co\erSheet.aspx?ltemiD=1037 2/3