1230 MADRONA AVE 2016-01-01 MF Import

April 10, 2005 Proposed Single-Pamily Residence L&A Job No. SA019 Page 5 leet of loosc organic topsoil. In 'I'est Yit 2, located in ihc lo��er portion of the site, thc advance out��ash deposit �vas ovedaiv by 2.3 feet of the same brown �veathered soils and ].8 feet of topsoil, topped bv 2.2 fect of loose fill conlaining giass bottles and chunks of concrete rubble up to 24 inchcs in size. GROUNllV1'ATI�;R CONIN'CION Neither test pii had encountered groundwater. "I�he layer of densc to very-dense glncial drift eucountered at 3 fcet deep in Test Pit 1 located in lhc uphill arca of the site is practically impervious ancl �votddrperch stonnwater infiliraling into the underlying, more-permeable topsoil tmd weaihcred soils. 7'he depth to and il�e amount of ne��r-surf:ice, perched groui�dwaler in the uphill aren of thc site may [luctuate seasonally, depending on precipitalion, surface runoff, ground vcgclalion cover, sile utilization, mid othcr factors. "1'his perched grounchvatcr may completely dry up during the dryer sununer months and accinnulate and rise during the wet winter months. 7'hc ach�ancc ouhi�asU sandy soils underlying the sitc at about 6 to 7 fect dccp arc of moderately-high permcability, and would allow infiltrating stormwater to seep through relatively easily. 7'hcrelbre, where in contact with ilic underlying advance ouhvash sandy soils, the perchcd girounchvatcr Ilowing later.illy along Uie surlace of the glaci.il drift ��rould disappear quickly. 1��c do nol anlicipatc si�nificant impact of grounchvatcr on the conslntction of tlic proposed residence un the site. DISCUSSIONS AND RECO1IBII�:NllA'I'iONS GI.NrRAL 13ased on thc geologic and soil conditions encouniered by Ihe Iest pits, il is our opinion that the proposevicwpoint, provided that ihe reconnnendations in this report are fidly implemented and oUserved during cmistruction. Due !� thc scnsiti��e nature of thc steep terrain ovcr lhc site, we recommend L,lU & ASSOCIATES, INC.