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11/08/200d 11:12 8ERLO~RR ~EEll bCHN l L, HL '-) ~ ¢ l ~¢ ,' r November 8,2004 3obNo. 2648A00 Page 2 Laboratory testing consisted of. moisture content, dry density, and Atterberg limits tests, The results of the moisture content and dry density tests are shown on the boring logs. The Atterberg limits test results are presented on Plate 7. SEISIVIICITY AND FAULTING The lot is situated in the Coast Range geomorplaic province of California and is sei~aically dominated by the presence of the active. San Andreas Fault system. The San Andreas .Fault sysfeln is the general boundary between the northward moving Pacific Plate and the southward moving North American Plate. In the San Francisco Bay Area, relative plate movement is distributed across a complex system of generally strike-slip, fight lateral parallel and sub-parallel faults that include the San Andreas: Haywarcl,. Calaveras, and Greenville faults, amon8 other,. The lot is not within a Siate of California Earthquake Fault Zone for active halts. The active San Andre,as, Hayward, and Calaveras Faults lie'approximately '46, 16, and 6 km ~o the south west, and the active G~eenville Fault lies about 14 km to the east (Jennings, 1994). SUR2FACE CONDITIONS The roughly triangular-shaped site encompasses about 1.6 acres of land and is bounded by your Vineyard View project site on the west, New Vineyard Avenue on the south and old Vineyard Avenue 'on the north and northeast. The building pad site is generally flat with the we,~ and southwest portion generally level with the adiacent site and Vineyard Avenue. A roughly 2 horizontal to 1 vertical (2H:IV), up to about'3$ feet high downslope is located on the north, northeast and southeast sides of the building pad area. An exisuag storm drain line nmmng southwest to northeast is located 40 feet northwest of the building pad. Surface vegexauon k~ composed of light seasonal grasses. A }arge oak tree is located on the northeast downslope. SUBSURFACE CONDITIONS Our borings encountered interhedded, moist, silty clay, sandy clay, gravelly clay, gravelly sand and sandy gravel ~o the full depths explored. The clayey soils were very stiff to hard and the granular soils were very, dense. Atterberg limits tests of the near surface clayey soils revealed a liquid limit and plasticity Index of 36 and 19 inc[icating low to moderate expansion potential. Groundwater was noI encountered in an3' of the th~.ee borings drilled for this investigation. Groundwater elevation should be expected to fluctuate depending on time of yeax, weather conditions, and local irrigation practices. r, ilERLOCJ~[C[lV[D TIMEtI~NOV. 8. C10:32AiVANTS