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4 <br /> <br />• <br />It is difficult to understand the saturation of surficial <br />soils above the boring P1; a fairly large landslide has developed <br />at this location and it was fully saturated during the first <br />weeks of July although the area above the slide was very dry on <br />the surface. <br />It can be concluded that hydrological conditions as they <br />have been encountered during the spring and early summer of 1980 <br />appear to be very unfavorable and they cannot be well understood. <br />~,We recommend that as a minimum, ground water monitoring in <br />Ilexisting piezometers be systematically performed during the re- <br />II maining part of 1980 to obtain some more reliable data for the <br />j proposed construction development. <br />it <br />~I''2.2 SLIDES EXTENT AND CHARACTER <br />During our field mapping program, an area was delineated at <br />lithe property that probably comprises the extent of the old <br />landslides. An accurate delineation is very difficult and in our <br />~i',opinion, not necessary for the purpose of this study. The deline- <br />~~lation agrees generally with the work by IECO referenced earlier. <br />ii The extent of the slide area is shown on Plate 1 - Geotechni- <br />~'ical Map. The slide area is located approximately in the central <br />'~'Ipart between Sylvester Gulch and the unnamed creek on the west <br />~;jside of the property; on the south side, it is limited by a <br />'distinct flat bench extending at the elevation of 6,640 and <br />ihigher. On the north side, the slide area is limited by the <br />'lower distinct bench at an elevation of 6,300 and lower. <br />~'i In addition to the slide extent, the geotechnical map shows <br />lisome geotechnical and morphological features related to land- <br />ilslides and general stability conditions. It shows areas that are <br />lapparently free of old landslides; it shows minor flat benches or <br />Ilflat landslide portions. It shows steeper slope portions that may <br />'comprise old slides scarps or slide toes. Several recent slides <br />• !that developed on the site either this year or several years ago <br />fare shown as well. <br />oo«.owco~nu~.a r.c <br />