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August 18,2015 Paul Palzer, Public Works Director Page 2 of 7 Reference: Part 1 Wellhead Protection Plan Amendment,City of Centerville Task 1•Assembling Required Data Elements Collecting and presenting data elements is an important part of the Part 1 Wellhead Protection Plan.While much of this data is available from different sources, additional effort is usually required to compile, field verify, format, and summarize the data in a usable format. This data is a necessary element that is to be incorporated into the delineation analysis in Task 2. To the extent possible, Stantec will utilize the data already collected for the existing Part 1 Wellhead Protection Plan. However, certain changes in MDH data collection requirements over the past decade will likely necessitate a more extensive collection and analysis of data. Categories of data to be assembled include: Physical Environment Data-This includes data relating to precipitation, geology, soils, and water resources that may be applicable to the Centerville wells and water supply system. Land Use Data-This includes maps that may be used to delineate wellhead capture zones based on real surveyed boundaries, such as parcel maps and political boundary maps. Water Quantity Data - This data is used to determine the volume of water to be modeled in Task 2, both from the City's own wells and from nearby wells that may impact the size and shape of the capture zone. Water Quality Data -This data includes tests that may indicate the age of the water supplying the City's wells.Specific age dating testing is typically sought, but any data that shows the presence of recently infiltrated water is useful. In particular, any data that demonstrates interconnection between groundwater and surface water will be needed. Task 2: Delineatina Wellhead Protection Areas The delineation of the wellhead protection areas will comprise the largest portion of work to be done for the Part 1 Wellhead Protection Plan.The end result of this task is a scientifically delineated wellhead protection area for each of Centerville's primary water supply wells. Delineation Criteria Five criteria are used to determine the level of effort and methodology required to delineate the wellhead protection areas. These criteria are used to develop a l,Cslgr'wilt)L,O-i Iry on I .r rn;t 1:r 22