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HENKLE &VA1. Consulting Geologists <br /> Economic and Geotechnical Geology <br /> 16 Dec. , 1987 <br /> Bi 11 Fox <br /> ' Project Manager <br /> Thortec International <br /> " P.O. Sox 4249 <br /> Modesto, Ca. 95352 <br /> Dear bill , <br /> As per your request. I am writing this letter report on the <br /> soils geology and shallow ground water regime at the Ralph Hayes <br /> and _on. Inc. site. The site is located at 10765 W. Clover Road <br /> in Tracy, California. <br /> SOILS GEOLOGY <br /> The site is underlain by recent basin deposits derived from <br /> the San Joaqui River System. These soils were deposited during <br /> f I -.-T d stages of mayor streams in areas between natural tresm <br /> levees and alluvial fans. <br /> The specific soils geology is revealed in the logs of I-ivJ 1 , <br /> 2, and _ which were logged by our personnel . The site is <br /> un::er-1 sin to a depth of "bout 20 -feet by a light brown clay of <br /> ,ir"1 ib :e silt content and medium plasticity ( Cl to Cl/Ml ) . The <br /> cont_-nt of' this unit increases tow.irds the northeast. :t <br /> is predominately C1 in MW 1 and as predoirtiinatel )� _-I- Ml <br /> in :'!W 21 and Z. The consistency of the upper unit varies From <br /> stiff i-o very stiff. - <br /> ?'!-:.s unit is underlain by at least -0 -feet of light brown, <br /> micaceok.is, clayey silt ( 111/Cl ) . This unit has low plasticity <br /> and :_ries from stiff to very stiff in consistency. It was <br /> logged as M1 /C1 in each of the three wells drilled for this <br /> progrin. <br /> As can be seen from the logs, the soils underlying the site <br /> are lithologically consistent over the area that Was <br /> investigated. There are no major pinch outs, cut outs, or other <br /> stritigraphic discontinuities present. <br /> Soils samples were taken at 5 foot intervals with a Modified <br /> California split spoon sampler. These samples were sealed with <br /> tinfoil , capped with plastic lids, sealed with tape and <br /> transported to California Water Labs. of Modesto. The samples <br /> were analysed for Total Petroleum Hydrocarbons including BTX. No <br /> c-3ntamirantes were detected during the lab analysis. <br /> 1 <br /> 230 FlNCH WAY • CARSON CITY,W 89701 • (702)849-1683 <br />