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Wright Environmental Services, Inc., CA Exploratory Boring Log <br /> Project No.4889 BORING NO. B-7(nw corner claifier) Drilling Method: GeoProbe 6600 Page 1 of 1 <br /> Logged by: CMP Date: October 28,2008 BOREHOLE COMPLETION: <br /> Client: City of Tracy Well Installed: No. <br /> Location: Wastewater Plant Total Depth: 25' <br /> 3900 Holly Dr.,Tracy, CA <br /> Permit: SJC EHD SR 55560 Cement Grout Seal: 25'to surface <br /> Water Levels:1st Enc: 12'@ 08:20 Static: hole closed off at 08:55, NM. <br /> v <br /> Sample PID Cont. <br /> No. push ,�Depth Lithology Log Well Detail/ <br /> Backfill <br /> Road Gravel Fill, near claifier <br /> B-7 <br /> f <br /> @ 5' 0 { 5 CL-Sandy CLAY, brown 10YR5/3, low platicity clay, f. snd 20%, stiff, damp. <br /> Same as above, stiff,damp. <br /> B-7 , <br /> @ 10' 0 <br /> 10 Thin SP sand bed at 10 to 11 feet,o/w same as above. <br /> +�f <br /> SP-SW-SAND, brown 10YR4/3, f.to crs. snd 90%,fines nonplastic 10%, dense, <br /> B-7 saturated below about 12 feet. <br /> @ 15 0 i <br /> 15 <br /> Same as above,contains sandy clay interbeds up to 6-inches thick at 18-19 feet, <br /> loose, saturated. <br /> B-7 <br /> 4\ <br /> @ 20' 0 <br /> 20 <br /> CL-Sandy CLAY, brown 10YR5/3, low plasticity clay 805, f. sand 20%dissem. <br /> in clay, massive, stiff, damp to very moist at 20 feet. <br /> B-7 ;fsf SP sand interbeds from 23-25 feet,then transition to clay bed at 25 feet; <br /> @ 25' 0 25 borehole flows back to 15 feet, re-push to open hole for water sample. <br /> Bottom of Boring =25 feet <br /> Temporarily case borehole for water sample <br /> PID-reconnaissance vapor in ppm. <br /> Reviewed by PG <br />