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LOG OF EXPLORATORY BORING <br /> PROJECT NUMBER 939-03.14 BORING NO. MW-4 <br /> PROJECT NAME San Joaquin County - Corral Hollow Landfill PAGE I OF 2 <br /> x BY S. Lofholm DATE 4/11/88 SURFACE ELEV. 243.31' <br /> POCKET PENETRA- Z1rJ =� LITHO- .JJ <br /> RECOVERY PENETRO• TION p�W t—B. J GRAPHIC J~ DESCRIPTION <br /> METER (Blows/ Q3� off Q COLUMN 31m <br /> (FT/FT) (TSF) Ft.) Gt p <br /> 0 SM SILTY SAND FILL, light yellowish brown <br /> (10YR, 6/4) to dark yellowish brown (10YR, <br /> 4/6); 25-30% fines; fine sand; trace fine <br /> gravel; loose; dry. <br /> r I.2/1.5 25 SP ::: SAND, brown (10YR, 4/3); <5% fines; 90% <br /> fine sand, 10% medium to coarse sand, <br /> 5 subangular to subrounded, predominantly <br /> ' 1.5/1.5 19 SM quartzose; trace fine gravel; medium dense; <br /> dry. <br /> SILTY SAND, brown (10YR, 4/3); 40% fines; <br /> 1.1/1.5 18 60% fine, trace medium to coarse sand; minor <br /> brown rootlets; trace iron oxide coating on <br /> 'a grains; medium dense; moist. <br /> 1,. 1.2/1.5 38 <br /> CL SILTY CLAY, olive (5Y,5/3); low plasticity <br /> fines; 5-10% fine sand; trace iron oxide in <br /> 1.2/1.5 35 10 _ small concretions; very stiff; damp to moist. <br /> @ 9.5 feet: < 5% fine sand. <br /> 1.5/1.5 26 @ I1 feet: trace very fine muscovite; <br /> increasing moisture content. <br /> v'a OxA <br /> 1.5/1.5 20 40� <br /> 1 <br /> 1.5/1.5 23 6!1!88 <br /> 15 <br /> 1.5/1.5 27 @ 15.5 feet: very thin ( < 0.1") sandy <br /> interbeds, fine grained, subangular to <br /> angular, quartzose; trace iron oxide <br /> I.5/I.5 26 concretions; trace rootlets. <br /> q. @ 17.5 feet: moist to wet. <br /> 1.5/1.5 29 @ 18.5 feet: thin sandy interbeds, saturated. <br /> i <br /> 20 <br /> REMARKS <br /> Drilled by 8-inch continuos-flight hollow-stem augers; samples collected with 2.5-inch <br /> outside-diameter modified California split-spoon sampler. Borehole converted to 2-inch <br /> EMCON monitoring well as shown on Well Details. <br /> ASSOCIATES <br />