2007-11-28 CC Packet - Laserfiche WebLink

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Response: While the overall sensitivity of aquifers in this area of Anoka County may be considered "high," our review of well log data within the project area indicates a significant thickness of clay overlying the sand and gravel aquifer from which most domestic wells obtain their water supply. The table below (modified from the Item 13 table in the EAW) shows the thickness of clay in each of the identified wells, ranging from 20 feet to 65 feet, with an average thickness of 55 feet of clay in the wells (overlying the area aquifers). While these wells are primarily drift aquifer wells, the presence of clay not only protects the drift aquifer from surface contaminants, but also protects all underlying bedrock aquifers from contaminants that may otherwise infiltrate at the project site. Unique Owner Address Depth Aquifer Use Clay Thickness Number (feet) (feet) 126886 Flovd Lamotte 1695 Main Street 69 Drift Domestic 56 142031 Paul Houle 7124 Centerville Road 72 Drift Domestic 56 154341 Ron Van Kleek 7060 Goiffon Street 65 Drift Domestic 20 155862 Mickey Peloquin 7084 Centerville Road 78 Drift Domestic 60 155889 Joe Lacasse 7072 Centerville Road 72 Drift Domestic 60 163273 Richard Carpenter 7095 Centerville Road 79 Drift Domestic 65 169296 Randv Zarbock 1745 Heritage Street 66 Drift Domestic 56 176066 AI Augustine 7064 Centerville Road 65 Drift Domestic 49 176073 Harold Rivard 7046 Centerville Road 68 Drift Domestic 62 182913 Charles Underwood 7128 Progress Road 65 Drift Domestic 24 194483 Helen Turcotte 7073 Centerville Road 66 Drift Domestic 58 431482 Paul Anderson 7082 Progress Road 75 Drift Domestic 60 439185 John Mishler 1740 Heritaqe Street 71 Drift Domestic 62 439246 Jim Mannino 1680 Sorel Street 92 S1. Peter Domestic 68 460032 Bjergo Construction 7086 Proqress Road 75 Drift Domestic 63 509563 Trio Inn 7082 Centerville Road 100 S1. Peter Domestic 55 509649 Chauncey Barett 7024 Centerville Road 100 Prairie du Chien Domestic 50 531590 Dean Jernell 1749 HeritaQe Street 80 Drift Domestic 60 548749 Ralph Joe Wanless 7046 Goiffon Road 64 Drift Domestic 58 554336 Tim Strong 7096 Proqress Street 68 Drift Domestic 60 554370 Kelly's Korner Bar 7098 Centerville Road 106 Prairie du Chien Domestic 54 554859 Timberlane Homes 1680 Heritage Street 80 Drift Domestic 65 629085 David Kilian 1695 Sorel Street 70 Drift Domestic 50 656414 Peter Despen 1688 Heritaoe Street 64 Drift Domestic 56 For the purposes of wellhead protection planning, the Minnesota Department of Health uses 10 feet of continuous clay overlying an aquifer unit as the standard for classifying such units as being" low" in vulnerability. Based on this standard, it would appear that the utilized drinking water aquifer(s) directly underlying the project site have more-than-adequate geologic protection to be classified as "Iow" in vulnerability. While it is possible that contaminants may still enter wells in the project area, either through horizontal flow within the aquifer from off-site sources or through vertical transport through improperly constructed (or abandoned wells), the overall likelihood of contamination from activities in the project area affecting the underlying aquifers appears to be low. Mitigation of contamination risks should target ensuring that any wells in the project area are properly maintained and that any abandoned wells are properly sealed to meet Minnesota Well Code. Centerville Downtown Redevelopment Page 8