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TABLE OF ONTFNTS <br /> ;,. <br /> 1.0 INTRODUCTIONPAGE <br /> ...............................................................................................................1 <br /> 2.0 SITE BACKGROUND <br /> 2.1 Site Location and Description... •............................................................................ <br /> .2 <br /> 2.2 Removal of 550-Gallon Tank .. ...........................................................................2 <br /> 2.3 Regulatory Review....................................................................... ........5 <br /> .................... <br /> 2.4 Lawrence Livermore National Laboratory Groundwater Inestigation...................5 <br /> 3.0 SUBSURFACE CONDITIONS...........................................................................................7 <br /> 3.1 Site Geology.............................................................................................................7 <br /> 3.2 Site Hydrogeology...................................................................................................7 <br /> 4.0 PRELIMINARY SITE ASSESSMENT..............................................................................8 <br /> 4.1 Technical Approach.................................................................................................8 <br /> 4.2 Boring Locations......................................................................................................8 <br /> 4.3 Drilling...................................................................................................................10 <br /> 4.4 Borehole Soil Sampling.........................................................................................10 <br /> 4.4.1 Soil Sampling Methodology...................................................................10 <br /> 4.4.2 Field Monitoring for Volatile Organic Compounds <br /> 4.4.3 Lithological Logging..............................................................................11 <br /> 4.5 Hydropunching......................................................................................................11 <br /> 4.6 Stockpiled Soil Sampling.......................................................................................12 <br /> 4.7 Field Quality Assurance/Quality Control Procedures............................................12 <br /> 4.8 Laboratory Analyses..............................................................................................12 <br /> 4 <br /> L <br /> 5.0 ANALYTICAL RESULTS................................................................................................14 <br /> 6.0 CONCLUSIONS AND RECOMMENDATIONS.............................................................15 <br /> 7.0 REFERENCES...................................................................................................................16 <br /> L <br /> TETRA TECH:Castle Rock Forest Fire Station,Preliminary Site Assessment Report Page i <br /> 1 <br /> L <br />