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File No. NFS-4342-01 <br /> DATE DRILLED: 3/18/98 DRILLER: Exploration Geoservices <br /> ELEVATION: DRILLING METHOD: Hollow Stem Auger <br /> BACKFILL METHOD: As Shown DIAMETER OF BORING: 8 in. <br /> LOGGED BY: S. Derrega DEPTH TO GROUNDWATER- 9 ft. <br /> O MC a <br /> Z O N <br /> N s Z Log of Exploratory Boring No. MW-4 q c5 Water we„ <br /> E m o LL o =� .o Level c«�:vuaio„ <br /> N m o_ <br /> 0 Description rn <br /> 1 LEAN CLAY with silt and minor sand, light olive brown,some <br /> carbonate staining and veinlets, moist, stiff. <br /> 2 <br /> 3 <br /> 4 <br /> 14 2.5 CL <br /> 5 4-1 <br /> 6 <br /> 7 <br /> 8 — — — — <br /> SILTY SAND with abundant mica flakes,olive brown,wet, loose. - <br /> 9 SM _ <br /> -21 10 LIN <br /> 10 4-2-2 1.0 LEAN CLAY with silt, olive brown,very moist, stiff. CL <br /> 11 <br /> 12 — — — — <br /> 13 <br /> 14 <br /> 24 NA SILTY SAND(fine size), olive brown, mica flakes and minor oxide SM <br /> 15 4-3 staining,wet, medium dense. <br /> 16 <br /> 17 <br /> 18 <br /> 19 <br /> -41 �� 23 NA LEAN CLAY with silt and sand, olive brown,abundant minute mica — <br /> 20 <br /> 21 <br /> 22 Boring terminated at 20 feet. <br /> Groundwater encountered at 9 feet. <br /> 23 <br /> Note: Blows/foot count derived from a 3 inch Modified California <br /> 24 Sampler has been converted to Standard Penetration Test Values. <br /> 25 <br /> t Effl <br /> Lathrop uen <br /> Earth Systems Consultants La <br /> Northern LOG OF EXPLORATORY BORING NO. MW-4 <br /> NthCalifornia Percolation Ponds <br /> �_� Lathrop, California Figure 10 <br />