5302 SOUND AVE 2016-01-01 MF Import

�-820-6953 Rug 05�94 15:�9 „_ CqSCADE GEOTECHNICAL INC. Au�uat S, 1994 Job No. 9407-04(i rxommendations for existing home. The recommendations conreined below for undeipinning the house and protecting the slopes from infiltraGon from surface waters should ptotect the safety of the home occupants until more permanent corzections can be made. In addition, founding the deck atructuro on pin piles placed inro bearing soil will help prouct the deck alainst uWement. 'fie slope appears to be highly susceptible W fu�ther slumping durin¢ earthquakes or extended perioda of wet weather. The proposed pin pile underpinning will not provide adequate latecal support W insure against siiding of the soll. We recommend that we be eneaged to compleu a slope nability analysis and to provide recommendations for the slabilizadon of this stope. No addi4onal fill should be imported onto this siu. Underpinning should protect the sttuctuce for pt�ttrophic failure while the ovaall corrxHon is being planned and carria! out. This overall conecdon should be undertaken immediately. Please contact us if you have any quesdon� [eeardin� ihe stability of the slope. The followIng recommendations are preliminary and may be altered or augmented upon review of the final plans. � �,. .� • u We rocommend that the vertical building loads from the wooden deck additions as well as vertical loads from the underpinning of the existing house be supported on two (2) inch diameter steel pipe piles. The steel pipe piles should be driven W refusal with a ninety (90) pound tir hammer. Pile refusal is defined as less than one (1) inch of peneuation into beatinY suii PGT one (1) minute of continuous driving. Each pipe pile driven to refusal would develop two (2) tons of maximum safe bearing capacity. Mficipated pile lengths wili probably range betwan four