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Q <br /> J KLEINFELDER <br /> File No. 23-430020. D00 <br /> August 26, 1994 <br /> 6.0 CONCLUSIONS <br /> 6.1 ENVIRONMENTAL CONCLUSIONS <br /> Kleinfelder conducted an environmental assessment of the proposed tank excavation at the project <br /> site to evaluate the distribution and concentration of select contaminates identified as concerns by <br /> SJCEHD. <br /> L <br /> Based on the analytical results obtained on our samples, petroleum hydrocarbons appear to be <br /> present to a depth of approximately 25 feet in boring 13-1 and 13-2. The extent of the petroleum <br /> hydrocarbons is unknown. <br /> j1 6.2 GEOTECHNICAL CONCLUSIONS <br /> Kleinfelder conducted a geotechnical assessment of the proposed tank excavation at the project <br /> I_ site to evaluate the stability of soil for the tank excavation location and the soil below the garage <br /> foundation. <br /> jBased on our analysis of samples obtained from boring B4 and 13-2, underpinning will be <br /> necessary for the garage structure and some type of lateral support will be necessary for the trench <br /> excavation. Items of concern are the garage structure, existing utilities, and roadway integrity. <br /> Consultation with the City of Stockton should be done to address potential problems with Hunter <br /> - Street and utilities present at the site or in the roadway that are the property of the City. <br /> 1 The following assumptions were necessary to evaluate and make recommendations for the <br /> underpinning and the trench excavation support. <br /> • The maximum depth of excavation will be 20 feet from top of sidewalk. <br /> • Underpinning will be needed to provide lateral support for the adjacent foundation. <br /> • Groundwater will not be encountered. <br /> • The excavation will only be large enough to remove the tanks and that substantial <br /> overexcavation beyond the tanks will not occur. <br /> - _ ETH:md 7EI94 <br /> Copyright 1994 Kleinfelder, Inc. Page 11 of 14 <br />