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MPC-5 <br />2 <br />8 <br />3'8" Jackhammer Very dense PCC with large (2.5" to s') aggregate. i ne <br />to 2", then contractor began to jackhammer through PCC but the <br />cored. bit bent due to the density. Switched to coring. <br />10"-16"-Very dense, brown silty CLAY; <br />1.5'-Mottled brownlblue-gray clayey SILT, trace fine <br />sand; <br />2'-3'8"- Very stiff, blue-gn y, clayey SILT, trace fine <br />sand; r/-" pen. of rod. _ <br />MPC-6 <br />4 <br />7 <br />3' Jackhammer 1 I"-IG"-Layer of wood. Una61e to penetrate fully with <br />air pressure, so vacuum couldn't suck out soil. <br />2'8"-w.;ter level. Soil appeared to be dark brown, silty <br />CLP Y, wet. <br />Slight petroleum hydrocarbon odor. <br />MPC-7 <br />4 <br />8 <br />3'8" Jackhammer I'- Soft, brown, silty CLAY with coarse gravel and <br />fine cobbles. Probe pen. 13" <br />2'- Transitions to gray -blue silty CLAY. Sample taken <br />for arsenic testing. <br />2.5'-Stiff gray —blue silty CLAY. Probe pen. 1.5" to 2". <br />MPC-8 <br />4 <br />7 <br />4' Jackhammer Very Strong hydrocarbon odor throughout. <br />I I" -Brown, silty fine to medium SAND. <br />2'- Brown silty CLAY. Sample taken for arsenic <br />testing. <br />3'-Piece of concrete in hole; rill material. <br />3.5'-Dark brown, silty CLAY, wet. <br />hlI'G9 <br />4.5 <br />If) <br />4' Jackhammer IS" -Stiff, brown, silly CLAY, trace fine sand. Fill. No <br />odor. <br />1 <br />2.5'-Piece of wood in silty CLAY. <br />Groundwater <br />Please see MPA October 2001 report. <br />CONCLUSIONS AND RECOMMENDATIONS <br />Based on the results of the field investigations and analyses, it is our opinion that there <br />are no geotechnical constraints that would preclude project construction as planned, <br />provided our recommendations are incorporated into the design. Our design <br />recommendations and conclusions in this section were developed based on our <br />understanding of the project. If the nature or location of the proposed construction is <br />changed, MPA should be notified so we can change or confirm our recommendations. <br />For the following sections, please see MPA 2001 report in Appendix A. <br />• Site Clearing, Demolition and Removal <br />It Grading Recommendations <br />• Structural Fill Materials and Compaction <br />• Wet Weather Earthwork <br />• Structure Foundations <br />• Utilities <br />• Site Drains ee and Erosion Considerations <br />Geotechnical and Tunnel Consultants <br />17270 Woodinville -Redmond Rd, Ste 703 Phone (425)486-6561 <br />Woodinville, WA 98072 Page 4 `:ax (425)488.2660 <br />