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Lodi Ready Mix T <br /> Report-Soil Boring Insta ion <br /> Project No. 93.1 <br /> August 2, 1993 <br /> Page 4 <br /> 2.4 Borehole Closure <br /> After successfully collecting the bottom hole soil sample at 42 feet, the soil <br /> boring was closed by installing a granular bentonite plug at the bottom of the <br /> boring, hydrating it with tap water and then pumping a neat cement grout <br /> (augmented with c4% bentonite) to grade with a slurry pump and a tremie <br /> pipe. <br /> 2.5 Disposition of Soil Cutting <br /> Soil cutting generated during the soil'boring installation was added to the <br /> existing stockpile on site within the fenced yard. <br /> 2.6 Sto`ckpil:e�Soi1�S_ampling <br /> In order to further characterize the stockpiled soil from the UST excavation <br /> (pile #3), GTI collected one. grab. sample from a random location <br /> t approximately 18 inches into the soil pile. L�abor_atory.nalyses=showed:that: <br /> thersampie,contained 66v�ng/K�of_m.o.tc�:r_o.i.t- f-St aa-b.ove;d:e:te_cti-on-lima-ts). <br /> -an �c <br /> The;chromatogram�did-notxresemb'Ie=the �st�3ndar-d-and -the-chefrtist-su.gge5ts* 7-Fil 1 <br /> tha} <br /> t the-sample•is-weatheredYd�ieselA(:l�igl�ter�consti�tuents�have--be:en'<�egrade.c� � r�J <br /> and-on-lyztheyheavier—r.em-ai—)? y <br /> Due to the relatively low levels of. degradedp etroleum hydrocarbons <br /> contained in the soil sample, GTI `recommends that the soil pile be approved <br /> for unregulated disposal. <br /> r 3.0 RESULTS OF INVESTIGATION <br /> I.f <br /> The data collected during this investigation have been summarized in the <br /> following sections. <br /> 3.1 Site Geology <br /> The subsurface geology is characterized by sand with interbedded silt lavers. <br /> The sand ranges in grain size from very fine to coarse (modified Wentworth <br /> scale). The sand contains varying amounts of a silt matrix and a hard sandy <br /> silt laver was encountered at 25 feet. This silt laver contained oxidized root <br /> casts which suggest that it is not a reducing environment (typical of soils 1 <br /> contaminated with petroieum hydrocarbons). The detailed boring log is ' <br /> attached i.n Appendix B. <br />