<br />17 <br /> <br />certerra.com 4660 Main Street, Suite 100, Springfield, Oregon 97478 T: 541.393.6340 <br /> <br />Figure 5: Oregon HazVu: Statewide Geohazards Viewer Landslide Map of project site and vicinity <br />https://gis.dogami.oregon.gov/maps/hazvu/. <br /> <br /> <br />2.5 Infiltration Testing and Results <br /> <br />We performed two (2) additional explorations for falling head infiltration testing at the site, IT -1 and IT-2, at the <br />approximate proposed stormwater swale locations, as indicated on the architectural site plan, drawing sheet <br />A001. The tests were conducted at approximately the transition from the Fat Clay layer to the surface of the hard, <br />weathered Eugene Formation stratum, which was encountered at the testing locations at about 16 inches bgs. <br />We performed a washed gradation (ASTM D1140) on a sample collected from the bottom of IT-1 and IT-2, in <br />order to classify the soil. The results of our washed gradations are presented in Table 2 below. The approximate <br />locations of IT-1 and IT-2 are shown on the Exploration Location Plan (see Figure 4 above). <br /> <br /> N <br /> <br />Approximate <br />Project Site <br />Location