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from this depth were moist to wet, but not saturated The soil boring locations were <br /> selected based on an understanding of the lateral extent of the known soil contamination <br /> as determined from the April, 1992 site assessment All borings drilled during this phase <br /> of the investigation were purposely placed outside this zone of contamination <br /> Consequently, no hydrocarbon odors were noted in the unsaturated zone during the drilling <br /> of any of the soil borings, except for MW-1. <br /> The soil stratigraphy in each of the borings was highly variable, but consisted of primarily <br /> ' interbedded silt and fine-grained sand with minor clay down to a total depth of <br /> approximately 30 feet No thick sequences of clay, which could conceivably prevent the <br /> ' downward migration of the hydrocarbon contamination, were noted during the drilling of <br /> process <br /> In accordance with San Joaquin County Environmental Health Division and RWQCB <br /> practices, all soil cuttings generated by the borehole drilling and sampling operations were <br /> contained and stored on-site The one soil boring not converted to a groundwater <br /> monitoring well was subsequently filled with a grout slurry, consisting of 100 percent <br /> Portland cement, to within one foot of the surface QA/QC procedures for soil sampling <br /> and delivery to a certified analytical laboratory are presented in Appendix 1. Lithologic <br /> logs of the borings are presented in Appendix 2 <br /> 1 <br /> r <br />