ARCHIVED REPORTS_SOIL AND GROUNDWATER INVESTIGATION REPORT 2006

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PROJECT: TRACY GRAVEL PITS Tracy, California Log of Boring No. GMX-24 (cont'd) SAMPLES 0 W H 2 Z E DESCRIPTION REMARKS W�' d o °o O0 Q a NAME(USCS):color,moist, %by wt., plast.density,structure, o` �Z m� L " cementation, react.'w/HCI,geo.inter. Cn LEAN CLAY(CL): cont'd POORLY GRADED SAND with CLAY(SP-SC):wet 34 Grab groundwater sample 95%fines, 5%fine sand, medium to high plasticity, very soft - GMX-24-082205 collected 35 - through 5 feet of 1-inch OD Sch.40 PVC screen CLAYEY SAND SC grayish brown 10YR 5/2 wet, 70% place -inch slot size) ( ) 9 Y ( ) placed in borehole from 44 36 fine to medium sand, 30% low plasticity fines,firm - to 49 feet bgs. - Enviro-core drive casing Thard retracted from bottom of 37 0 0 - boring to 44 feet bgs to T 60/o fine sand,40/o low plasticity fines maintain surface seal. 38 - POORLY GRADED SAND with CLAY(SP-SC): LEAN CLAY (CL): grayish brown (10YR 5/2), moist, 90% _ fines, 10%fine sand, low plasticity, hard 39- 40- 41— ------------------------------------ SANDY 9 4041 --------------------------------- — SANDY LEAN CLAY(CL): grayish brown (10YR 5/2),wet, 42 70%fines, 30%fine sand, low plasticity,firm - ------------------------------------ SANDY LEAN CLAY/CLAYEY SAND (CUSC): grayish brown 43 (10YR 5/2),wet, 55%fines,45%fine to coarse sand, low plasticity, firm --------------------------------- - CLAYEY SAND (SC): grayish brown (10YR 5/2),wet, 75% 44fine to coarse sand,25% low plasticity fines - 45 --------------------------------- — POORLY GRADED SAND (SP): dark grayish brown (10YR 46 4/2),wet, 95%fine to medium sand, 5% low plasticity fines 47 Driller noted heaving sands. 48 - - 49 - Bottom of boring at 49.0 feet Borehole destroyed using - Type 1-II neat cement 50 _ grout placed from total depth to ground surface with a tremie pipe. 51 OAKBOREV(REV.3/00) Geomatrix Consultants Project No.7066.001 1Page 3 of 3