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<br />City of Cenferville <br />Hidden Spring Park <br /> <br />Page 2 <br />3/27108 <br /> <br />. Bonestroo will present this work plan to the Parks and Recreation Committee and City Council as <br />soon as possible. <br />· Bonestroo will begin work as soon as the City has approved the work plan. <br />. City officials, assisted by Mr. Thompson should inspect Bonestroo's work once complete. <br /> <br />Rain Garden <br />A brief discussion of the soil mix in the rain garden centered around the percentage of sand specified. <br />Bonestroo's job specs called out 60% sand, 20% compost and 20% topsoil. Mr. Thompson's suggested <br />mix showed 75% sand and 25% compost. Several other items were discussed including replacement plant <br />selection, subgrade compaction and draintile. At the end of the discussion, the following action items were <br />set: <br /> <br />· Mr. Thompson will test the compaaion of the subgrade material as soon as the ground thaws. If <br />the compaction level is found to be too high. Bonestroo will direct the contractor to correct the <br />situation since Bonestroo's specifications called for loosening of the subgrade material. <br />. City staff will fill the rain garden with a measured amount of water and allow it to drain out. This <br />drain-ilown will be timed to determine if the rain garden drainage is meeting expectations. If it is <br />not, Bonestroo will facilitate soil amendments to increase the infiltration ability prior to replanting <br />of the rain garden. <br /> <br />Please let us know if the Parks and Recreation Committee would like any further information. <br /> <br />Sincerely. <br /> <br />BONESTROO <br /> <br />R?'4;;:j- <br /> <br />Mark Statz, PE <br />City Engineer <br />651-604-4709 <br /> <br />copy: Paul Palzer - Public Works Director <br />Gregg Thompson - Association of Metropolitan Soil & Water Conservation Districts <br />JJM, JRS - Bonestroo <br />file <br />