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20170504163211.pdfOn- "�-GIEO-rECH C0NSt11--'1*ANTS, INC. Buffalo Run Ccmpany 2830 — '96th Street Southeast Bothell, 1�ashington 98012 Attention: Michael E, McCormick Subject: Transmittal Letter — Geotechnical Engineering Study Proposed 4-Lot Short -Plat 23016 — 94th Avenue West Edmonds, Washington Dear Mr. McCormick: 132-16 2 th S.-6- mz 747-56:2 Fab-rjar,y 2Z 2006 JN 06013 We are pleased to present this geotechnical engineering report for the property at 23C16 — 94th Avenue West in Edmonds. The scope of our services consisted of exploring site surface and subsurface conditions, and then developing this report to provide recommendations for general earthwork and design criteria for foundations, retaining walls, pavements, and infiltration, This work was authorized by your acceptance of our proposal, P-6942, dated December 29, 2005. The attached report contains a discussion of the Study and our recommendations. Please contact us if there are any questions regarding this report, or for further assistance during the design and construction phases of this project. Respectfully submitted, 'GEOTECH CONSULTANTS, INC. Gerry D. Bautista, Jr. Geotechnical Engineer cc: Site Development Services — Dave Dougherty via facsimile: (425) 485-7199 GDBIJHS: esn .0 ) t'J f-T L Z P-T 1"'"J - 'r -"'T 1:1 � -F-,)?, mccWO',(7 GEOTECH CONSULTANTS, INC. s �4�134 TP-1 TP-2 A Lot 4 Lot 3 TP-3 TP-4 Exisung. House TP-5 TP-6 Lot 2 ---------- ...... ...... — TP-7 TP-8 Lot I GEOTECH - CONSULTAIWS, INC. M-'- SITE EXPLORATION PLAN -PL -kT 2301=6 - 94th Avenue West L Edmonds, Washington Mite: No SCM .lob %i �C13 10 16 5 110 15 I L L!LM TEST PIT I 1 UP5011 Description uFange to Orown, slightly silty SAND� fine- to medium -grained, rri6ist, loose Gray, grave I ly, sijty SAND, fin -e-to medtur�-g rained, very -moist to wet, very dense • Test Pit terminated at 9 feet on January 31, 2006. • Perched groundwater observed at 4 feet during excavation. • Light caving observed from 3 to 4 feet during excavation. TEST PIT 2 Description EFmnge to brown, silty SAW, fine- to medium -grained, moist loose -% I - beccrries gray, gravelly, Very moist to wet, very dense - becomes less gravelly • Test pit terminated at 8.5 feet on January 31, 2006. • Perched groundwater observed at 3.5 feet during excavation. • No caving observed during excavation. GEOTECH 44 CONSULTANTS, INC EST PIT LOG 23016 - 94th Avenue West Edmonds, Washington It Job Date: Loggod Y: plate: 06013 February 2M5 G D 0 10 CC7 �F TEST PIT 3 Description r Los; LC-) I I _qp Brown, slightly Silty SAND, fine- t_0med­1um-qrai_nd, _moist, I-oose __ I S . M � - F'i Gray, grav�lT1sT1tTSAt4E­fi_n�- -to medium -grained, very moist to wet, very dense SM Test Pit terminated at 8 feet on January 31, 20M Perched groundwater observed at 4 feet during excavation. No caving observed during excavation. 15 0 Cp 5 10 15 TEST PIT 4 Description Orange to brown, silty SAND, fine- to medium -grained, moA loose - becomes gray, gravelly, very dense • Test Pit terminated at 8 feet on January 31, 2006. • No groundwater observed during excavation. • No caving observed during excavation. GEOTECH CONSULT.-V'rM LN-C TEST PIT LOG 23016 - 94th Avenue West Edmonds, Washington Dato: Ogged by: 06013 1 Fatmary 2006i Plato: 5 10 15 A r- 10 15 I 010 ZY CP TEST PIT 5 Description Brown, gravelly, slightly 'Silbj SAND, fine- to me—dium--grained,--moist, loose - becomes light brown, medium- to coarse -grained, dense Gray, gravelly, silty SAND. fine- to medium -grained, very moist to wet, vM dense * Test Pit terminated at 8 feet on January 31, 2006. * Perched groundwater observed at 6 feet during excavation. * No caving observed during excavation. TEST PIT 6 Description Topsoil ZY,—amg—eto—brown, silty SAND, fine- to medium -grained, moist loose - becomes gray, gravelly, with fine-grained sand lenses, very dense beiromes wet • Test Pit terminated at 8 feet on January 31, 2006. • Groundwater observed at 6 feet during excavation. • No caving observed during excavation. GEOTECH 44 CONSULTANTS, INC. TEST PIT LOG 23016 - 94th Avenu:eWest Edmonds, W a s h �in 9 t D :nt::] ............................ Job !I �' � 0 11111! 1111 11 �� 06013 '2006 Plate: 5 10 is 19 10 16 0 I X TEST PIT 7 Description 1-ange ED Drown, silty SAND, fine- to medium -grained, moist, loose becomes gray, gravelly, very moist to wet, very dense • Test Pit terminated at 8 feet on January 31, 2006. • Perched groundwater observed at 5 feet during excavation. • No caving observed during excavation. TEST PIT 8 Description Topsoii Crange to brown, silty SAND, fine- to medium -grained, moist, loose J�j SM 1'�j - becomes graY, gravelly, very moist to wet, very dense • Test pit terminated at 8 feet on January 31, 2006. • Perched groundwater observed at 5 feet during excavation. • No caving observed during excavation. GEOTECH coNsui;r.-8.N-r-S, INC TEST PIT LOG 23016 - 94th Avenue West Edmonds, Washington Job Dato: IL-099ed b "W13 February 2C)06 Gy,:B F�Iate: Slope backfill away from foundation. Provide surface drains where necessary. Tightline Roof Drain Backfill (Do not connect to footing drain) FC (See teXt Tor requirements) 0 Nonwoven Geotextile Filter Fabric C; Washed Rock U- (7/8" min. size) Possible Slab 000'-10 �p 0 -0 00110 -0 4" min. Vapor Retarder[Barrier and Capillary Break/Drainage Layer (Refer to Report, text) 4" Perforated Hard PVC Pipe (Invert at least 6 inches below slab or crawl space, Slope to drain to appropriate outfall. Place holes downward.) NOTES: (1) In crawl spaces, provide an outlet drain to prevent buildup of water that bypasses the perimeter footing drains. (2) Refer to report text for additional drainage, waterproofing, and slab considerations. GEOTECH -44 CONSULTAXrS, INC. p-00TIM; DRAIN DETAIL 23016 - 94th Avenue West Edmonds, Washington 7job �-801 ojjfe'* 13 1 Feb. 2005 Sieve Opening (mm.) Sieve Opening (US standard) --4--TP-2, Z. M-15.0% TP-3, V. m-9,3% GEOTECH CON�,ULTANTS. INC. 100 RO so 70 so FA 40 so 20 10 0 GRAIN SIZI -ANALYSIS 23016 - 94th Avenue West Edmonds, Washington JO Date: Felt 2COC, F r -(Vae � � 4 Ac /4r 'S7 (,-7 7-7, co 0 � ru xxx C4 0 4W .988 CY -7 14-1 (18 o Jrs t4 4- 7 Le 4- 1,2, 3, 6e a C- _L. �+4- .' I- -, -z 0 4 d," 4- -Z 5-r 0 - (4-1 67 ke cc Lo 3 T � = S-ro 14F , 4L Z- 0- R, 4r / C) -ro) .f X14�m : r u A '*U, kL L I _i_r -t-kllll� v :z.s 4,57 So C) r 3, A a r 41 Us �Aj 2. C� 1-1, 0 C- 'cl v2erf 14 r�, C, 14 j 6w a- C, C-1 Ito o, 14-7 A,— -161 -Z7 o �4 8 170 Dn' e to 6,/ s -, 0 � I I - � 1, t I G c--P' to 4— 7 -1 Do 1 Coc 4, A, so