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1 SM Brown, poorly—graded, rine grained sand with some silt and little or' no clay. `:;>>'h� 4{•=:``. SC Gra lsh- reen fine grained sand with silt and little clay. No coarse 'Fraction. - --"" No odors or stains observed. No organic matter. ":tid.`z _;� Medium plastic Tines. f=errous iron oxidized to light brown. Color within two _ days. Predominantly fine sand. No odors or stains observed. --- - No organic matter. - — 10 SC '100% Core recovery =-_ 20 1 20 ML Brown indurated silt with some sand and clov. SC Brown fine -grained sand with little c€ay anal silt. Very uniform. No coarse =--- "'' fraction. No odors or stains. .30 • . k by w.�{ .] __ 33D _ y SP Grayish-brown, poorly-graded sand with little or no fines. Sand ranges from about 20,# to 60,#. Very clean, the sand becomes cleaner and coarser with depth (from' 30 to 42 feet bgs). The base g of the unit has a thin bed of pea gravel and well-graded sand. --- 40Sys Gray, well--graded sand with pea gravel. 140 ---- M SP Fine to medium-grained .sand, grayish brown with variable clay content. ibrown, poorly-gradea fine grained-sand with, clay and some silt. _ — ---- Na medium-grained sand, Small carbon fragments. Some apparent SC Brown fine-grained. sand with clay acid some silt. Medlum-pl-astic fines. SC = - 50 mottling. No odors or stains. 15D — --- MLS __--_ SC Brown, poorly--graded fine-grained sand with clay and some silt. Mft SC Brown to grayish-green silt and clayey-sands with -little or no course sand. GW Gray gravel, well graded, with sand orad little or no fines. Cobbles greater exp o than 2 inches in diameter. No recovory. p.� " 80 __=--_- 00o ao� 180 � � n opo __- - SW Well-graded sand, with little or no floes (assumed) " _-_ - _-= GW Sand and gravel Q 4 na goo n I 70 _ _� SM Gray silty-sand with clay (tuffaceous?) 170 _ fir;;"^„�'a'.• SC Uniform brown clayey-sand, clay -Fraction is about one half of the fines, e smectite (ca.), In clayey parts of the section. Estimate less than 25% fines in - End log at 171 feet. clayey sections. - 80 CL Set 10-inch casing in a hin zone ay. Best oca ion wr ou 180 Drill hole and drill head rod. backfilled with lonestar #3 sand advancing to 90 feet. Yellowish-brown, fine-grained, sand with some silt S :H• '• M and little clay, Occasional thin beds of clayey sand. The- formation is fairly uniform from 43 feet to 90 feet bas. No Gravel or medium sand is present. No odors or stains. Drill head buried from 176 to 190 ft. X30 ,. s::) 190 SP Gray, poorly-graded fine to medium-grained sand with little or no fines. Friable T,D. 190' feet rayis •-green o y-e owis - rown clayey sand with some silt. No SC medium-grained -sand org ravel. Fine fraction has low to medium plasticity. No odors or stains observed. - -' e . ra a sandwith € e or no fines. - 100 IS Yellowish-brown fine grained sand with silt and little clay. 200 r . z Unocal Broa! a 'Avenue TITLE: A SWC.P cme GROUP FIGURE 3 Stratlgraphic Column at MW-07 1835 North Sutro Avenue E PREP. BY: CLS REVIEW BY: Stocttton,Copforntd 186 North Sutra Avenue, Stockton PLOT a t:r €1RAW14C No. PREP. DATE: 6 22 96 REVIEW UATE:� Nn'f T : ::: SHEET 1 Or t CAD55WW.nWG