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I I I Council Meeting Minutes June 23, 1998 Page 6 Council Business. continued Hoffman asked if they will need any traffic control devices at the intersection of 16th Terr. and 23rd Ave. Proper does not believe the intersection's traffic volumes dictate a traffic control device. Gunderman asked if an environmental assessment was performed. Beach said an environmental assessment had not been performed, but the surveyor determined the amount of drainage the development would contribute to the lake. Gunderman said many adjacent residents have had water problems and noted concern of increased drainage. Beach feels the grading and additional catch basins will assist in moving drainage away from adjacent properties. Benke added that the identified wetland determination did not require an environmental impact statement. John Rengo, Beach's surveyor, explained that staff recommended installation of a six- inch overflow pipe to ensure stormwater flows to the southwest. Rengo is unsure of the benefit of this pipe being the grading design would maintain existing outflows from the wetland. Samuelson asked if the wetland poses any risk of overflowing into adjacent properties. Rengo does not believe the wetland would overflow, and in fact, the proposal reduces the area currently flowing into the wetland by diverting into the street. Larson prefers that the drainage pipe travel into the catch basin located at Lot 1. Rengo added that the RCWD may restrict installation of piping to drain the wetland area. Larson believes no one would object to the wetland being drained when the possibility of flooded backyards or basements may occur. Benke recommends this issue be discussed further when the site plan is reviewed. Gunderman asked if the stormsewer design is based on a 100-year storm. Rengo said the design is based upon a la-year storm event. The drainage pond's calculations and rate controls determined that runoff from a 100-year event would increase Stony Lake's water elevation by less than one inch. If a stormwater outlet from Stony Lake was warranted, it would not be due to this proposed development, but from existing conditions. Rengo is not opposed to the stormwater outlet, but believes this development contributes a small portion to the entire drainage area. Rengo believes the RCWD will approve the development's permit. Gunderman noted there are trees currently underwater in this area. Benke questioned whether any proposed development would exacerbate current drainage problems. Rengo feels this proposal would not change or create notably worse conditions. Rengo disagrees with staff's denial of the Lot 6 variance, and feels this lot contain an unique circumstance due to its narrow lot line and inaccessible buildable area. He noted preference for a 28 ft. width roadway versus the proposed 32 ft. width. Bob Swoverland, 1614--23rd Ave. NW, feels this proposal will only augment existing drainage problems at the 17th St., 14th St. and 23rd Ave. stormsewers, and additional flowage would most likely kill Stony Lake. Also, this area contains the largest natural grove of oak trees in the City which are now faced with endangerment by this project. Traffic is a significant issue in this neighborhood, and residents prefer the cul-de-sac access be onto Silver Lk. Rd. The residents feel the traffic study does not adequately reflect increased school year traffic. Swoverland noted a 1980 DNR report stating the existence of a Blanding Turtle habitat. Teague will research the DNR report. Council Business Preliminary Plat and Variance for Stony Lake Development Report 98-133