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2 <br />0 <br />0 <br />0 <br />z <br />w <br />m <br />U) <br />0 <br />00 <br />CO <br />N <br />0 <br />z <br />J <br />a <br />a <br />0 <br />0 <br />N <br />w <br />Z) <br />U) <br />w <br />w <br />U) <br />a <br />w <br />OD <br />wsb <br />Memorandum <br />To: Michael Grochala, Community Development Director, City of Lino Lakes <br />Dave Pecchia, Interim City Administrator, City of Lino Lakes <br />From: Jon Christensen, PE, WSB <br />Date: March 31, 2025 <br />Re: North Building Setback - Water Treatment Plant <br />WSB Project No. 021336-000 <br />The City's new Water Treatment Plant (WTP) building, located at 6590 121h Ave S, was intended <br />to have a 50' setback from the right-of-way boundary on Birch Street and on 121h Ave S. The <br />actual building currently under construction has a 46' setback from the right-of-way boundary on <br />Birch Street. The purpose of this memo is to outline the cause of the issue and how it impacts <br />site development. <br />Water Treatment Plant Buildina Setback: <br />The WTP building (and associated sitework) shift was caused by a data conversion process error <br />at the start of the design phase of the project. <br />For the purposes of background information, Minnesota counties use a geographic coordinate <br />system that is different than the geographic coordinate system surveyors use (NAD 1983). In <br />order to align these two different coordinate systems, a custom "geographic transformation" is <br />required. Standard procedure for the survey crew would then be to use the coordinates <br />"transformed" to NAD 1983 and then stake the building corners for construction. For the WTP <br />project, this "geographic transformation" was inadvertently not applied, causing the parcel <br />linework to be shifted in the design files at the beginning of the design process and ultimately <br />staked in the field accordingly. <br />Essentially, this data conversion issue has caused the building and sitework (parking lot, etc.) to <br />be shifted and constructed 4' to the north and 0.42' to the east of the original planned location. <br />Thus, impacting the allowable building setback on the north side of the site (46' vs. 50'). All other <br />setback requirements associated with the site will not be impacted by the coordinate shift. <br />The schedule of events related to the building setback issue are provided as follows: <br />- February 191h - Data inconsistency issue was discovered when WSB staff was developing <br />a plan for a "test well" on the property. Discovery regarding the issue followed. <br />- February 261h - WSB survey crew was sent to the site to collect data and verify the <br />location of the WTP building. Discovery regarding the issue followed. <br />- March 141h - Determined that "geographic transformation" issue discussed above had <br />caused the shift on the WTP Site. <br />- March 191h — Jon Christensen informed Michael Grochala of the issue at the WTP site. <br />Sitework Impact <br />As part of the proposed WTP construction, a large cast -in -place concrete clearwell tank has <br />already been constructed on the site (below grade). The above grade exterior wall now <br />