7622 RAINIER DR 2016-01-01 MF Import

i � t CASCADE GEOTECHNICAL June 10, 1991 Lyle Ulank Job No. 9105-16G I Page A , and with some gravel (till) . At four (4) feet below the surfaca, the till became gray and very dense. in Test Pit :t, we observed three and one-half (3 1/2) feet loose to dense, rusty-brown to Ibrown, sand with some sil* and gravel below the topsoil layer. The sand was overlying very dense, gray, silty sand with some gravel � (till.) . � We encountered ground water seepage within all of the test pits. The ground water appears to be perched on top of the unweathered I till. Weak ground water seepage was noted at two and one-half (2 1/2� feet below the surface in Test Pits 1 and 2 and at three and one-half (3 1/2) feet below tl�e surface in Test Pit 3. The test Ipits were left open for approximately one-half (1/2) hour. The volume of the excavated test pits was 48 to 60 cubic faet. The Ivolume of water withiu Test Pits 1 and 3 after one-half (1/2) hou'� was approximately two (2) cubic feet per test pit. We noted onl} Ione-half (1/2) a cubic foot of �aater at the base of Test Pit 2. We revieiued the "U.S.G.S. Preliminary Surficial Geologic Map of the IMukilteo and Everett Quadranqles, Snohomish County, l4ashington" by Mackey Smith, dated 1976. The area of our investigation was mapped Ias Vashon Till. The very dense, unweathered silty sand with some gravel we observed in the test pits is consistent with this Iinterpretaticn. CONCLUBIONS AND PRELIMINARY RECOMMENDATIONB I The following *ecommendations are hreliminary, and may be altered or auqmented upon review of the final plans. IWe conclude that the site is suitable for the proposed development if the following recommendations are carefully followed. We � understand from our co��versaY.ions with you that the existing - — � .