1920 MERRILL CREEK PKY 2018-01-01 MF Import

( SHANNON�WILSON,INC. wer the structure subgrades, among others. Reter to the "Wet Weather IFarthwork" secdon for a discussion of these measuces. ► During construction, it will be necessary to control groundwater seepage and surtace water runoff with a system of d�ainage ditches and swales. Deeper cut-off tren�.ies that penetrate into the glaciai soils or belaw planned exc;avadon depths may be required in some amas to allaw eacavation to proceed in the dry. � Grading of the site to promote drainage will be necessazy at all times. Surtace water shoutd not be allowed to 8ow over the east slope under any cincumstance, unless in a tighdined pipe. I ► The proposed buildings could be supporte� on conventional spread foodngs and 1 s la b-on-g�a de floors. The footings should bear in dense W very dense glacial soils or on compacted structu�al fill placed directly on these glacial soils. We recommend the use of an allrnvable soil bsaring pressure of 4,000 pounds per square foot (ps� for simplicity. If desired, select building arcas lacated in undisturbed, native, till-like soils could be designed for 8,000 psf. 8.1 Site Devclonment i � I In our opinion, development of the site as �lanned should not create a ha7ard w the subject property provided the recommendations in this report u�e followed. Additionally, it is our opinion that development witl not adversely affect the east slope or result in a decrease in Itt,e stability of the slope. Instead, collecting and conuolling surface water upslope, as part of sitc development, and preventing its flow wer the slope should decrease the rate of future Islope erosion. Additionally, flattening of select slope areas, as discussed in the following section, should decrease the risk of local instability. Both measures should at least maintain Iand most likely increase the current stability of the slope. In fact, if the recommendadons herein u�e followed, it is our opinion that the proposed construcGon should help W reduce, but not eliminate, the potential for futurc erosion and themby tend to incmase the stability of the slope as a whole. I 8.2 Slope Stability � The stabiliry of the existing slope atong the eastern mazgin was assessed to establish buitding setbacks and provide recommendaGons for slope remediadon. This secdon provides a � summary of the chazacteristics, relsiive stability, and potential mode of tailu�e of each geologic unit observed on the slope. I W-6693-01 � 10