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T <br /> HENKLE & ASSOCIATES <br /> Consulting Geologists <br /> Economic and Geotechnical Geology <br /> 16 Dec. , 1987 <br /> Bi 11 Fox, <br /> P'rojec't Manager <br /> Thortec International <br /> P.O. pox 4249 1 <br /> Modesto, Ca. 95352 <br /> Dear Bill , t <br /> As per your request, I am writing this letter report 4n the <br /> soils geology and shallow ground water regime at the Ralph Hayes <br /> and Son, 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 /> thy. Ca.s7 Joaquin River . System. These soils were deposited during <br /> stage's of major streams in areas bet Veen natural "'":-ea t <br /> flood -t" - - <br /> levees and alluvial fans.- <br /> ; i <br /> The specific soils geology is revealed in the. logs of- MW ! I <br /> and 3 which were logged by our. personnel . The site i': j <br /> underlain n to a depth of about 20 feet by a light brown clay W <br /> v ari nhis gilt content and medium plasticity ( CI to Cl/Ml ) . Th:= <br /> silt content of thaw unit increases towards the northeast. _ _ <br /> predominately .� /fir+t . 1 <br /> ��._.�s logged ...-�s predominately C1 i n MW 1 and as predor�i na Bey _�, �_. . . ,.t <br /> in MW ? and 3. Theconsistency of the upper unit varies From I <br /> E <br /> stiff to very stiff. -- <br /> This unit is underlain oy ar least -to feed-of light brown, <br /> mi_aceoul, clayey silt ( MIX! ) This unit has low plasticity <br /> and varies] fromstiff to very stiff in consistency. , It was <br /> logged :as Ml /C1 in each of the three, wells drilled for this <br /> program. <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 /> ' 4 <br /> stra.tigraphic discontinuities present. <br /> Soils samples were .tak:en 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 Cal iforniaWater Labs. of" Modesto. The samples y <br /> were analysed for Total Petroleum Hydrocarbons including BTX. No <br /> c-ontaminantes were detected during the lab analysis. <br /> 1 <br /> 230 FINCH WAY • CARSON CIN, W 89701 • (702)849-1683 <br />