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Lucy Foster
6 years ago
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11 FIGURES

12 SW 175TH AVE 350 SW SCHOLLS FERRY RD SW FRIENDLY LN Area 64 SW ROY ROGERS RD SW ONEILL CT SW LUKE LN SW LEEDING LN SW TUSCANY ST SW 164TH AVE SW BULL MOUNTAIN RD SW 164TH AVE SW 161ST PL SW STAHL DR SW MILAN ST 300 SW BRAY LN SW 161ST AVE SW UPLANDS DR SW TOWHEE LN SW 160TH AVE SW ROSHAK RD SW COLONY DR SW BARROWS RD SW 157TH AVE SW BRISTLECONE WAY SW SUNDEW DR SW BAKER LN SW DEKALB ST 250 SW MALLARD DR SW SUNRISE LN SW 150TH AVE SW BURGUNDY ST SW MENLOR LN SW ROUNDTREE DR SW FIRTREE DR SW 153RD AVE SW CABERNET DR 250 SW 148TH AVE SW 148TH PL SW SOPHIA LN 250 Area 63 SW FINIS LN SW 149TH PL SW LASICH LN SW BEEF BEND RD SW APRIL LN SW ROSARIO LN SW 147TH AVE West Bull Mountain Planning Area FIGURE 1 PROJECT SITE MAP LEGEND West Bull Mountain Planning Area ± 0 2,000 Feet 1 INCH EQUALS 800 FEET File: J:\M-R\Otak\Otak-31\Otak-31-01\Revised Figures\Otak F1.mxd Printing Date: 11/11/2009 Data on this map is from Washington County and Metro's RLIS database. This information was developed at multiple scales and accuracies. No warranty is made with this map.

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13 West Bull Mountain Planning Area FIGURE 2 GEOLOGIC MAPPING FROM MADIN (1990) File: J:\M-R\Otak\Otak-31\Otak-31-01\Revised Figures\Otak F2.mxd Printing Date: 1/11/2009 ± NOT TO SCALE REPRODUCED FROM GEOLOGIC MAPPING BY MADIN (1990)

14 SW 175TH AVE 350 B-13 B-14 SW SCHOLLS FERRY RD SW FRIENDLY LN SW ROY ROGERS RD B-15 B-17 SW TUSCANY ST B-19 B-8 B-7 SW ONEILL CT SW LUKE LN SW LEEDING LN SW 164TH AVE SW BULL MOUNTAIN RD SW 164TH AVE B-18 SW 161ST PL SW STAHL DR SW MILAN ST 300 SW BRAY LN SW 161ST AVE SW UPLANDS DR SW 160TH AVE B-4 SW TOWHEE LN SW ROSHAK RD SW COLONY DR SW BARROWS RD SW 157TH AVE SW BRISTLECONE WAY SW SUNDEW DR SW BAKER LN SW DEKALB ST 250 SW MALLARD DR SW SUNRISE LN SW 150TH AVE SW BURGUNDY ST SW MENLOR LN SW ROUNDTREE DR SW FIRTREE DR SW 153RD AVE SW CABERNET DR 250 SW 148TH AVE SW 148TH PL SW SOPHIA LN B SW LASICH LN B-9 SW BEEF BEND RD SW FINIS LN SW APRIL LN B-3 B-2 B B-6 B-1 B-16 SW ROSARIO LN B-11 B SW 149TH PL SW 147TH AVE West Bull Mountain Planning Area FIGURE 3 REVISED GEOLOGIC MAP File: J:\M-R\Otak\Otak-31\Otak-31-01\Revised Figures\Otak F3.mxd Printing Date: 11/11/2009 LEGEND West Bull Mountain Study Area GeoDesign Borings Geologic Unit Recent Alluvium Fine-Grained Missoula Flood Deposit Columbia River Basalt ± Data 0 2,000 Feet 1 INCH EQUALS 800 FEET on this map is from Washington County and Metro's RLIS database. This information was developed at multiple scales and accuracies. No warranty is made with this map. Water

15 16C B 37B 9 7C 45A 45A W 11B 37B 37A SW 175TH AVE SW LASICH LN 37C 37B 9 21D 7B 45B 45B 37C 1 45A A 37A 11D 7C 45B 7B 22 SW SCHOLLS FERRY RD SW FRIENDLY LN 7B SW ROY ROGERS RD 37B West Bull Mountain Planning Area FIGURE 4 SOIL SERIES MAP 1 45D 45B File: J:\M-R\Otak\Otak-31\Otak-31-01\Revised Figures\Otak F4.mxd Printing Date: 1/11/ C 11B 37A 11B 11C 11B W 46F 22 SW TUSCANY ST SW 164TH AVE SW BEEF BEND RD 37B 11B 11D 11C 37C LEGEND SW ONEILL CT SW LUKE LN SW LEEDING LN 7B 37C SW 161ST PL SW STAHL DR SW MILAN ST 11B SW BULL MOUNTAIN RD SW 164TH AVE 11D 11D 16C 11D 16C 11C 11C SW BRAY LN 22 37C 11C 11B 1 11B 16C 7B 11E 11D 7B SW 161ST AVE SW UPLANDS DR 11D SW FINIS LN SW APRIL LN 7D SW TOWHEE LN SW 160TH AVE SW ROSHAK RD SW COLONY DR 11B 19B 22 West Bull Mountain Study Area Soil Series Boundary (Labels are Soil Map Units) 11C 11C SW BARROWS RD SW 157TH AVE SW BRISTLECONE WAY SW SUNDEW DR 11C SW BAKER LN 7C SW DEKALB ST 7B 37B 11D 11E 11D ± 11C 11C 11B 11C 19B 19C 44C 11D SW MALLARD DR 76 SW SUNRISE LN SW 150TH AVE SW BURGUNDY ST 19D SW MENLOR LN SW ROUNDTREE DR SW FIRTREE DR 7D 37B 7C SW 153RD AVE 7B 11E SW CABERNET DR 19B 11C 37C 37C 7C 37B 1 11B 11B 11D 7D 7D 46F SW 148TH AVE SW ROSARIO LN SW 148TH PL SW SOPHIA LN 21B 11B 7C 1 11C 7B 11D 11B 11E 11E 0 2,000 Feet 1 INCH EQUALS 800 FEET SW 149TH PL SW 147TH AVE 7C 11C 11D 11D Data on this map is from Washington County and Metro's RLIS database. This information was developed at multiple scales and accuracies. No warranty is made with this map. 7D 11C

16 SW 175TH AVE SW SCHOLLS FERRY RD SW FRIENDLY LN SW ROY ROGERS RD SW ONEILL CT SW LUKE LN SW LEEDING LN SW TUSCANY ST SW 164TH AVE SW BULL MOUNTAIN RD SW 164TH AVE SW 161ST PL SW STAHL DR SW MILAN ST SW BRAY LN SW 161ST AVE SW UPLANDS DR SW TOWHEE LN SW 160TH AVE SW ROSHAK RD SW COLONY DR SW BARROWS RD SW 157TH AVE SW BRISTLECONE WAY SW SUNDEW DR SW BAKER LN SW DEKALB ST SW MALLARD DR SW SUNRISE LN SW 150TH AVE SW BURGUNDY ST SW MENLOR LN SW ROUNDTREE DR SW FIRTREE DR SW 153RD AVE SW CABERNET DR SW 148TH AVE SW 148TH PL SW SOPHIA LN SW FINIS LN SW 149TH PL SW LASICH LN SW APRIL LN SW ROSARIO LN SW BEEF BEND RD SW 147TH AVE West Bull Mountain Planning Area FIGURE 5 SOIL INFILTRATION LEGEND West Bull Mountain Study Area Soil Infiltration Good Potential Fair Potential ± 0 2,000 Feet 1 INCH EQUALS 800 FEET File: J:\M-R\Otak\Otak-31\Otak-31-01\Revised Figures\Otak F5.mxd Printing Date: 11/11/2009 Poor Potential Water Data on this map is from Washington County and Metro's RLIS database. This information was developed at multiple scales and accuracies. No warranty is made with this map.

17 SW 175TH AVE SW SCHOLLS FERRY RD 20 >15 B-13 WASH11504 > B-14 SW FRIENDLY LN >33 >35 >16.5 >65 SW ROY ROGERS RD B-17 >15 B-15 >15 SW TUSCANY ST B-19 B-8 > SW 164TH AVE >14 B-7 > >15.5 B >15 WASH51759 >28 27 WASH11516 >38 >36 >41 15 >21 >22 SW ONEILL CT SW LUKE LN SW LEEDING LN SW 161ST PL SW STAHL DR SW MILAN ST SW BULL MOUNTAIN RD SW BRAY LN SW 161ST AVE SW UPLANDS DR SW 160TH AVE B SW TOWHEE LN SW ROSHAK RD SW COLONY DR B SW BARROWS RD SW 157TH AVE SW BRISTLECONE WAY SW SUNDEW DR SW BAKER LN SW DEKALB ST SW MALLARD DR SW SUNRISE LN SW 150TH AVE 10 WASH11542 SW BURGUNDY ST SW MENLOR LN SW ROUNDTREE DR SW FIRTREE DR SW 153RD AVE SW CABERNET DR SW 148TH AVE SW 148TH PL SW SOPHIA LN B-3 3 > WASH B-1 B-2 >15 > WASH63397 WASH50813 SW LASICH LN B-9 12 >15 WASH WASH1873 SW APRIL LN B-10 >15 SW BEEF BEND RD B-11 >15 B-6 >15 B SW ROSARIO LN 1 B SW 149TH PL 5.5 SW 147TH AVE West Bull Mountain Planning Area FIGURE 6 DEPTH TO BASALT BEDROCK LEGEND West Bull Mountain Study Area GeoDesign Borings Non-GeoDesign Explorations Water Wells 20 DepthtoBasalt File: J:\M-R\Otak\Otak-31\Otak-31-01\Revised Figures\Otak F6.mxd Printing Date: 11/11/2009 Recent Alluvium Fine-Grained Missoula Flood Deposit ± Columbia River Basalt Data Water 0 2,000 Feet 1 INCH EQUALS 800 FEET on this map is from Washington County and Metro's RLIS database. This information was developed at multiple scales and accuracies. No warranty is made with this map.

18 TABLES

19 Soil Series Name Soil Map Unit Liquid Limit TABLE 2 Soil Properties and Infiltration Potential West Bull Mountian Planning Area Washington County, Oregon Plasticity Index Percent Sand/ Percent Fines Saturated Infiltration Rate (inches/hour) Depth to Restrictive Layer (feet) Depth to Water Table (feet) Soil Infiltration Potential Aloha silt loam > Medium Cascade silt loam, 3 to 7 percent slopes 7B Low Cascade silt loam, 7 to 12 percent slopes 7C Low Cascade silt loam, 12 to 20 percent slopes 7D Low Chehalis silty clay loam >6.6 >6.6 High Cornelius and Kinton silt loams, 2 to 7 percent slopes 11B Low Cornelius and Kinton silt loams, 7 to 12 percent slopes 11C Low Cornelius and Kinton silt loams, 12 to 20 percent slopes 11D Low Cornelius and Kinton silt loams, 20 to 30 percent slopes 11E Low Cove clay > Low Delena silt loam, 3 to 12 percent slopes 16C Low Helvetia silt loam, 2 to 7 percent slopes 19B > Medium Helvetia silt loam, 7 to 12 percent slopes 19C > Medium Helvetia silt loam, 12 to 20 percent slopes 19D > Low Hillsboro loam, 3 to 7 percent slopes 21B >6.6 >6.6 High Hillsboro loam, 7 to 12 percent slopes 21C >6.6 >6.6 High Hillsboro loam, 12 to 20 percent slopes 21D >6.6 >6.6 Medium Huberly silt loam Low McBee silty clay loam > Medium Quatama loam, 0 to 3 percent slopes 37A > Medium Quatama loam, 3 to 7 percent slopes 37B > Medium Quatama loam, 7 to 12 percent slopes 37C > Medium Wapato silty clay loam > Medium Willamette silt loam, 3 to 7 percent slopes 44B >6.6 >6.6 High Willamette silt loam, 7 to 12 percent slopes 44C >6.6 >6.6 High Woodburn silt loam, 0 to 3 percent slopes 45A > Low Woodburn silt loam, 3 to 7 percent slopes 45B > Low Woodburn silt loam, 12 to 20 percent slopes 45D > Low Xerochrepts and Haploxerolls, very steep 46F >6.6 >6.6 Low Table 2 Otak-31-01:111209

20 ATTACHMENT

23 SYMBOL SAMPLING DESCRIPTION Location of sample obtained in general accordance with ASTM D 1586 Standard Penetration Test with recovery Location of sample obtained using thin-wall Shelby tube or Geoprobe sampler in general accordance with ASTM D 1587 with recovery Location of sample obtained using Dames & Moore sampler and 300-pound hammer or pushed with recovery Location of sample obtained using Dames & Moore or 3-inch-O.D. split-spoon sampler and 140- pound hammer or pushed with recovery Location of grab sample Graphic Log of Soil and Rock Types Observed contact between soil or rock units (at depth indicated) Rock coring interval Water level during drilling Inferred contact between soil or rock units (at approximate depths indicated) Water level taken on date shown GEOTECHNICAL TESTING EXPLANATIONS ATT Atterberg Limits P Pushed Sample CBR California Bearing Ratio PP Pocket Penetrometer CON DD DS HYD MC MD OC Consolidation Dry Density Direct Shear Hydrometer Gradation Moisture Content Moisture-Density Relationship Organic Content P200 RES SIEV TOR UC VS kpa Percent Passing U.S. Standard No. 200 Sieve Resilient Modulus Sieve Gradation Torvane Unconfined Compressive Strength Vane Shear Kilopascal ENVIRONMENTAL TESTING EXPLANATIONS CA Sample Submitted for Chemical Analysis ND Not Detected P Pushed Sample NS No Visible Sheen PID ppm Photoionization Detector Headspace Analysis Parts per Million SS MS HS Slight Sheen Moderate Sheen Heavy Sheen SW Sequoia Parkway - Suite 100 Portland OR Off Fax EXPLORATION KEY TABLE A-1

24 RELATIVE DENSITY - COARSE-GRAINED SOILS Relative Density Standard Penetration Resistance Dames & Moore Sampler (140-pound hammer) Dames & Moore Sampler (300-pound hammer) Very Loose Loose Medium Dense Dense Very Dense More than 50 More than 120 More than 47 CONSISTENCY - FINE-GRAINED SOILS Consistency Standard Penetration Resistance Dames & Moore Sampler (140-pound hammer) Dames & Moore Sampler (300-pound hammer) Unconfined Compressive Strength (tsf) Very Soft Less than 2 Less than 3 Less than 2 Less than 0.25 Soft Medium Stiff Stiff Very Stiff Hard More than 30 More than 65 More than 31 More than 4.0 COARSE-GRAINED SOILS (more than 50% retained on No. 200 sieve) FINE-GRAINED SOILS (50% or more passing No. 200 sieve) MOISTURE CLASSIFICATION Term dry moist wet PRIMARY SOIL DIVISIONS GROUP SYMBOL GROUP NAME GRAVEL (more than 50% of coarse fraction retained on No. 4 sieve) SAND CLEAN GRAVELS (< 5% fines) GW or GP GRAVEL GRAVEL WITH FINES GW-GM or GP-GM GRAVEL with silt ( 5% and 12% fines) GW-GC or GP-GC GRAVEL with clay GRAVELS WITH FINES (> 12% fines) CLEAN SANDS (<5% fines) GM GC GC-GM SW or SP silty GRAVEL clayey GRAVEL silty, clayey GRAVEL SAND SANDS WITH FINES SW-SM or SP-SM SAND with silt (50% or more of ( 5% and 12% fines) coarse fraction SW-SC or SP-SC SAND with clay passing SM silty SAND SANDS WITH FINES No. 4 sieve) SC clayey SAND (> 12% fines) SC-SM silty, clayey SAND ML SILT CL CLAY Liquid limit less than 50 CL-ML silty CLAY SILT AND CLAY OL ORGANIC SILT or ORGANIC CLAY MH SILT Liquid limit 50 or CH CLAY greater OH ORGANIC SILT or ORGANIC CLAY HIGHLY ORGANIC SOILS PT PEAT Field Test very low moisture, dry to touch ADDITIONAL CONSTITUENTS Percent Fine-Grained Soils Secondary granular components or other materials such as organics, man-made debris, etc. Silt and Clay In: Sand and Gravel In: Coarse- Grained Soils Percent Fine-Grained Soils Coarse- Grained Soils damp, without < 5 trace trace < 5 trace trace visible moisture 5 12 minor with 5 15 minor minor visible free water, > 12 some silty/clayey with with usually saturated > 30 sandy/gravelly sandy/gravelly SW Sequoia Parkway - Suite 100 Portland OR Off Fax SOIL CLASSIFICATION SYSTEM TABLE A-2

Depth (ft) USCS Soil Description TOPSOIL & FOREST DUFF

Test Pit No. TP-6 Location: Latitude 47.543003, Longitude -121.980441 Approximate Ground Surface Elevation: 1,132 feet Depth (ft) USCS Soil Description 0 1.5 1.5 5.0 SM 5.0 8.0 SM Loose to medium dense,