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-BENTONITE MONITORING WELL LOG BORING DRILLING METHOD DATE COMPLETED MW-3 Hollow Stem Auger 8/19/91 SYMBOLS DESCRIPTION ML BROWN SANDY SILT, fine grained, trace medium grains, moist, some angular - subangular gravel up to 5 mm in diameter, trace of mica, increase in sand with depth, iron oxide staining, macro pores. olor grading to dark brown, increase in fine sand. to: rades 'or CL ' BROWNISH-GRAY SILTY CLAY, wet, low plasticity, some black , mottling and iron oxide staining. , DARK GRAY SILTY CLAY, dry, medium to high plasticity, trace of blocky structures and white concretions, abundant iron oxide lined pores. ncrease in silt, soft, moist, low plasticity, decrease in iron CH ML oxide staining. fades to: BROWN CLAYEY SILT, trace white concretions, trace pores, / CL abundant mica, some gray mottling. ades to: GRAY SILTY CLAY, medium stiff, moist, low plasticity, blocky structure, some brown mottling, some iron oxide pores, trace white concretions. ML fades to: BROWN SANDY SILT, fine grained, trace black mottling, trace tines. ot clay Sm fades to: DARK GRAY SILTY SAND, fine grained, some white Concretions, trace of clay fines, some pores up to 1/2 mm diameter. OTES: 1)12-INCH BORING SAMPLED AND COMPLETED TO 24.5 FEET BELOW GROUND SURFACE ON 8/19/91. 21 MONITORING WELL COMPLETED ON 8/19/91. 31 4-INCH SCHEDULE 40 PVC BLANK CASING INSTALLED TO 7.5 FEET BELOW GROUND SURFACE. 4-INCH SCHEDULE 40 PVC 0.010 22.5 FEET BELOW GROUND SURFACE. DEPTH IN FEET u_ "3 CD U 20 SAMPLING 13 15- 16 24 25- 30- 35 5- 23 30 9 5 9 9 12 22 10- U U 20- U -5 0 5 20 25 30 35 SCREENED INTERVAL #2/I2 LONESTAR SAND METROPOLITAN STEVEDORE Stockton, California APRIL 1992 Page 1 of 1 V) DAMES & MOORE 12650-011-044