12-01-2021 Council Packet - Laserfiche WebLink

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Prepared by: Bolton & Menk, Inc. RYAN DRIVE IMPROVEMENTS 2022 Street & Utility Improvements (Woodlynn Ave, Ryan Dr) ǀ 0N1.125241 Page 4 approximately 2’ higher for a span of approximately 450’. 2. Watermain The existing watermain in the project area is a 6-inch diameter ductile iron pipe that extends east from the Spruce Street main line before terminating approximately 120 feet east of the intersection of Ryan Drive and Ryan Lane. Refer to Figure 2A in Appendix A for a depiction of the existing utility infrastructure. The water system has performed well historically and there are no known deficiencies with the system. Based on the age, type, and positive performance of the watermain, the existing system is anticipated to outlast the pavement improvements described in this report. The three properties on the north side of Ryan Drive east of Ryan Lane are all served by a 1.5” water service that runs from the intersection of County Drive and Ryan Drive all the way west to the property at 209 Ryan Drive. The service continues to function and is sufficient for the needs of the properties. 3. Sanitary Sewer All but three parcels within the Ryan Industrial Park are served by the City’s sanitary sewer system. The three other parcels are currently served by private septic tanks. The extension and commission of new sanitary sewer forcemain, laterals, and grinder pumps would provide City sanitary service to the remaining three unserved properties and complete the sewage collection system within the Ryan Industrial Park. Over time, septic systems age and require repair or replacement. Rules governing septic systems are becoming increasingly more stringent and, in some cases, impossible to achieve within parcels that have space limitations. Therefore, the availability of public sanitary sewer provides long-term access as septic tanks fail or are taken out of service. 4. Storm Sewer The existing storm sewer network in the project area is a combination of privately installed infrastructure that conveys stormwater from Ryan Drive to the Owasso Basin retention pond located south of Ryan Drive. The privately installed storm sewer network includes three separate lines. Two of these lines are west of the RWMWD culvert and take stormwater from 209 Ryan Drive and 200 Ryan Drive, respectively, and outlet northwest of the box culvert. These storm sewer systems are not installed within City right-of-way and are considered private. The third storm sewer system located east of the culvert is within City right-of-way and takes surface drainage from Ryan Drive and adjacent properties west before discharging directly to the Owasso Basin. Preliminary structure evaluations were completed by Bolton and Menk staff on this storm sewer system. The existing structures were found to be covered with dirt and debris. Follow-up exploration and televising by City maintenance staff found the existing lines to be collapsed and filled with dirt and debris. In its current condition, the existing storm sewer system is not capable of conveying stormwater from the street as intended and poses a risk of flooding in routine rain events. Replacement of the storm sewer system for this portion of Ryan Drive should be included within the scope of this project to address these risks.