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Wright Environmental Services, Inc. Exploratory Boring Log <br /> Project No. 4889 BORING NO.MWWES-1 Drilling Method: Hollowstem Page 1 of 1 <br /> Logged by: CMP Date:October 16,2009 BOREHOLE COMPLETION: <br /> Client:City of Tracy Waste Water Treatment Plant Well Installed:2"dia.Sch 40 PVC <br /> Location:3900 Holly Drive,Tracy,CA Total Depth:26' Casing Depth:25' <br /> Screen Length: 15' Slot Size:0.020 <br /> Permit:SJC EHD 55560 Blank Length: 10' Sand Pack:2/12 <br /> Water Levels: 1st Enc:13'@ 09:25 Static:15.6'rising @ 11:00 Top Sand Pack:8' Top Bentonite:6' <br /> m <br /> Grout Seal:V to surface Vault Box <br /> Sample PID Blow rL Well Detail/ <br /> No. /OV Count a Depth Lithology Log Backfill <br /> Road Base Gravel Fill <br /> SM-Silty SAND,yellowish brown 10YR5/6,slight plasticity fines 40%, ^^^ <br /> f.sand 60%,massive,damp,loose. ^"^ <br /> M W WES- 5 ^"^ <br /> 6.5' - 8 <br /> A " <br /> ML-CL-Sandy SILT to Sandy CLAY,dark grayish brown 10YR4/4,slight to low <br /> plasticity fines,silt/clay to 60%,f.sand 40%,faint bedding,rare caliche, <br /> firm to loose,damp. <br /> MWWES- _ 8 10 Same as above,less sand to 25%,slight increase in plasticity of fines,firm,damp to <br /> @ 11.5' moist,thin sandy bed at 11 feet. <br /> SC-CL-Interbedded Clayey SAND and Sandy CLAY,grayish brown 10YR5/2, <br /> MWWES- _ 15 Clayey Sand 70%f.sand and 30%clay;Sandy Clay 70%clay and 30%sand, <br /> @ 16.5' 8 massive overall,firm to loose,saturated yields water slowly. <br /> MWWES- 20 Same as above,clayey bed at 20-21 feet is moist to saturated,loose to soft, <br /> @ 20.5' - 3 saturated overall. <br /> Same as above,increase in silt/clay. <br /> MWWES- 6 25 <br /> @ 26' <br /> CL-Sandy CLAY,brown 10YR4/3, low plasticity fines,silt/clay 75%,f.sand 25%, <br /> massive to very faintly bedded,soft,moist to saturated, Increasing sand at 26 feet. <br /> Bottom of Boring=26 feet, <br /> native clay plug swabbed <br /> into the sampler hole. <br /> Reviewed by PG <br />