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CHAPTER ONE DATA ELEMENTS and ASSESSMENT (4720.5200) PART 1. REQUIRED DATA ELEMENTS This section contains required data elements that were outlined in the Scoping Decision Notice provided to Centerville by the MDH. Appendix E contains a table assessing the data elements required for this plan. Below is a summary of each data element. A.Physical Environment Data Elements Geology, soils, and water resources data elements are provided in City of Centerville Wellhead Protection Plan, Part 1 (MDH, 2001). The below table represents updated precipitation data from the Centerville area in inches, as calculated by the Minnesota Climatology Working Group’s online gridded precipitation database. The database correlates available surrounding precipitation data points to determine approximate precipitation values in the area of interest. Centerville Precipitation (inches), Minnesota Climatology Gridded Database YearJanFebMar Apr May Jun Jul Aug Sep Oct Nov Dec Total 20170.870.700.593.365.983.592.825.501.484.830.620.8432.12 20160.340.922.003.032.234.804.768.376.862.922.351.9642.41 20150.390.360.532.006.464.617.563.784.973.294.051.7634.62 20141.431.360.866.904.7310.552.144.542.621.291.511.1641.09 20130.621.312.184.684.756.682.820.681.383.760.731.4729.18 20120.661.611.402.489.873.454.930.980.581.450.971.6627.89 2011 0.86 1.242.353.045.133.767.174.510.710.970.240.7235.43 20100.560.720.871.482.724.914.283.995.251.492.252.9234.06 20090.441.121.201.540.403.482.556.830.546.570.482.2322.84 20080.110.521.703.743.813.552.942.562.431.751.331.6628.69 Avg0.600.991.373.234.614.944.204.172.682.831.451.6432.83 Average annual precipitation over the 10-year period from 2008 to 2017 was 32.8 inches, which is close to the 1981-2010 mean of 32.3 inches for the area. Precipitation is accounted for as recharge in the Twin Cities Metropolitan Area Regional Groundwater Flow Model Version 3.00 (Metropolitan Council, 2014). B.Land Use Data Elements 1.Land use – Land use was generally not considered for the Part 1 wellhead protection activities. Land use will be covered in greater detail in the updated Part 2 plan, where the role of land use on water quality will be closely reviewed. 2.Public utility services – The only public utilities that play a role in the Part 1 Wellhead Protection Plan are the municipal water supply wells in Centerville and other nearby public water supply wells for surrounding communities that utilize the same aquifers. Table 2 shows the modeled rates of the wells operated by Centerville. All high capacity wells in the DNR SWUDs database were already included in the MODFLOW model. However, all permitted high capacity wells within two miles of the Centerville wells 5