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. -�- Roger Peitso � Building Official WENCK City of Orono � ReSpOnslve parmer. Ezceptional outcomes. contemporary wetness. A Professional Soil Scientist (PSS) is similar to an archeologist in that we need to determine what was here thousands of years ago and why do we see what we see today. We weigh all available evidence to determine how the landscape formed, how the soil formed, and what factors (climate, relief, vegetation, organisms, geology/parent material, precipitation, run-on/off, etc.) contribute to the current morphological features observed in the soil. The Soil Conservation Service (now the Natural Resource Conservation Service) used PSS to conduct the National Cooperative Soil Survey. Soii classifications and descriptions are based on consideration of all the factors mentioned above, including contemporary versus historic hydrologic considerations. In previous versions of the Soil Survey the Lester series had the term "relict redoximorphic features" included within the series description. PSS who mapped these soils looked at all the evidence and determined that these glacial soils in upper landscape positions exhibited features that indicated wetness at some time in the past (thousands of years perhaps), but it is not contemporary. While ISTS practitioners receive training to interpret soil science to the best of their abilities, the economic realities of the industry do not allow for a deeper verification of what they see. When challenged, and with the potential to enter a lawsuit over a soil interpretation, it is not surprising an ISTS practitioner would be conservative in their interpretations. After pressure from the ISTS industry, because ISTS practitioners were incorrectly applying the relict tag to currently saturated soils as a "way out of a mound", the NRCS removed the term relict from series descriptions in Minnesota. Many soil series in other states (South and North Dakota for example) still maintain the relict description. Big Island We have been evaluating soils and ISTS suitability on Big Island from 2002-2016. At this same time we have been concurrently evaluating similar glacial soils across western Hennepin County, Carver County, Meeker County, McLeod County, and Wright County where similar glacial geology exists to Big Island. In the early 2000's we were making interpretations for ISTS suitability on Big Island for subsurface ISTS drain fields. At that time we were completing soil verifications with the City of Orono before soil verifications were required by rule. Then City of Orono ISTS Inspector Matt Bolterman visited as many as a dozen sites to witness the completion of soil borings for design, as well as installations. After Mr. Bolterman left, Willie Gibbs made visits to Big Island to review monitoring wells and piezometers installed on the island and to review soils. Mr. Gibbs visited the subject site at 540 Big Island around 2009. The third inspector we visited the island with was Loren Kohnen of Metro West Inspections in 2014. City of Orono records should have recorded these visits for the following properties: 540 Bi Island 510 Bi Island 150 Bi Island 440 Bi Island 210 Bi Island 140 Bi Island 450 Bi Island 190 Bi Island 120 Bi Island 620 Bi Island 180 Bi Island 130 Bi Island 470 Bi Island 170 Bi Island 460 Bi Island 560 Bi Island 160 Bi Island 4455 Ba side Road 2 7:\201S,lechnical M=mo Final D3081C.docx