2414 BAKER AVE 2017-01-13 - Laserfiche WebLink

Tom Eiden J N 101 i 4 June 21, 2010 P�g� � blocks untii the garage basement walls are installed. Similariy, if slope cuts can b2 extended into the alley and all traffic can be kept at least 10 feet from the back of the block wall until the basement walls are installed, Ultra blocks could be used along the western side of the excavation as well. If these restrictions on cut slope easements and traffic surcharges cannot be maintained, cantilevered soldier pile shoring will be necessary. We have provided recommendations for cantilevered soldier piles and Ultra block shoring in this report. The erosion control measures needed during the site development will depend heavily on the weather conditions that are encountered. While site clearing will expose an area of bare soil, the erosion potential on the site is relatively low due to the gentle slope of the ground. We anticipate that a silt fence will be needed around the downslope sides of any cleared areas. Rocked construction access roads should be extended into the site to reduce the amount of soil or mud carried off the property by trucks and equipment. Wherever possible, these roads should follow the alignment of planned pavements, and trucks should not be allowed to drive off of the rock-covered areas. Existing catch basins in, and immediately downslope of, the planned work areas should be protected with pre-manufactured silt socks. Cut slopes and soil stockpiles should be covered with plastic during wet weather. Following rough grading, it may be necessary to mulch or hydroseed bare areas that will not be immediately covered with landscaping or an impervious surface. The drainage and/or waterproofing recommendations presented in this report are intended only to prevent active seepage from flowing through concrete walls or slabs. Even in the absence of active seepage into and beneath structures, water vapor can migrate through walls, slabs, and floors from the surrounding soil, and can even be transmitted from slabs and foundation walls due to the concrete curing process. Water vapor also results from occupant uses, such as cooking and bathing. Excessive water vapor trapped within structures can result in a variety of undesirable conditions, including, but not limited to, moisture problems with flooring systems, excessively moist air within occupied areas, and the growth of molds, fungi, and other biological organisms that may be harmful to the health of the occupants. The designer or architect must consider the potential vapor sources and likely occupant uses, and provide sufficient ventilation, either passive or mechanical, to prevent a build up of excessive water vapor within the planned structure. We recommend including this report, in its entirety, in the project contract documents. This report should also be provided to any future property owners so they will be aware of our findings and recommendations. SEISMIC CONSIDERATIONS In accordar�ce with Table 1613.5.2 of the 2006 International Building Code (IBC), the site soil profile within 100 feet of the ground surface is best represented by Soil Profile Type D(Stiff Soil). The site soils are not susceptible to seismic liquefacfion because of their dense nature. CONVENTIONAL FOUNDATIDNS The proposed garage can be supported on conventional foundation bearing on the medium-dense to dense, native, slightly silty sands or on structural fill placed above these competent, native soils. An allowable bearing capacity of 3,000 psf may be assumed. A one-third increase in this ctesign bearing pressure may be used when considering short-term wind or seismic loads. For the above design criteria, it is anticipated that the total post-construction settlement of footings founded on competent, native soil, or on structural fill up to 5 feet in thickness, will be less than one inch, with GEOTECI-I CONSULTnNTS. INC.