<br /> <br /> <br /> <br /> <br /> <br /> <br />March 20, 2018 <br /> <br />Carol Schirmer <br />Schirmer Satre Group <br />375 W. 4 Avenue, Suite 401 <br />th <br />Eugene, OR 97401 <br /> <br />อด <br />REG/GIR <br />EOTECHNICALEOLOGIC NVESTIGATION EBUTTAL <br />CHPUD <br />APITAL ILL <br /> E,O <br />UGENE REGON <br /> <br />BEI.PN.14-020 <br />RANCH NGINEERING NC ROJECT O <br /> <br />This letter is intended to address specific comments regarding our February 6, 2017 Geotechnical/Geologic <br />Investigation report and subsequent May 30, 2017 Addendum prepared by Gary Sandstrom, CEG and myself. <br /> <br />I feel it should be stated that the report was intended to be a preliminary investigation for planning purposes <br />with a concentration on the proposed roadway layout; as stated in Sections 4.0 and 5.1 of the report <br />additional site evaluation at the time of more extensive design work and possible construction may be <br />required. <br /> <br />Specific comments by Gunnar Schlieder and others during the March 7, 2018 public hearing and in Mr. <br /> <br /> <br />Suitability of Lots 18 & 19 (formerly Lots 19 & 20 in our report) <br />The location of these lots as well as 16 & 17 are close to the mapped landslide area; however, as stated in our <br />report a site specific foundation investigation is recommended for these and all the lots on the east side of <br />the proposed development as a pier style foundation system or more extensive earthwork is anticipated for <br />these lots. Our report shows the area on Figure 1 as an exclusion zone for public improvements and special <br />consideration for residentia- <br />Addendum. <br /> <br />Regarding the scale on our Area Slope Hazard Map figure attached to the Addendum, Mr. Schlieder is correct <br />that the scale is twice as large as it should be and was likely not scaled properly; however, Figure 3 in our <br />report, which shows the similar landslide conditions is properly scaled. <br /> <br />Slope Instability <br />There are areas of gross land instability on the east side and those were field mapped to the best of our ability <br />with no ground reconnaissance of the site. The supposed landslide features that appear to encroach onto the <br />northeast portion of the site are just as likely to be erosional in nature if they exist at all. <br /> <br />sandstone -vs- volcanic rock. While true that our test pits did predominately encounter sandstone, the north- <br />northeastern portion of the site is mapped as intrusive volcanic rock in the Oregon Department of Geology <br />and Mineral Industies (DOGAMI) Open File Report (OFR) 0-03-11 and OFR 0-10-03 Map of the Geology of <br />the Southern Willamette Valley. Our site reconnaissance indicated the presence of this volcanic rock <br />EUGENE-SPRINGFIELD SALEM-KEIZER <br /> <br />310 5 Street, Springfield, OR 97477 | p: 541.746.0637 | www.branchengineering.com <br />th <br /> <br />