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1 0 <br /> Field Investigation Work Plan <br /> Brookside Estates, Stockton, California 1/9/07 Sert Consulting, Inc. <br /> known regulated environmental conditions for this investigation, the excess soils and water will be <br /> disposed of in accordance with normal construction practices. <br /> 3.0 <br /> PROPOSED SOIL AND GROUNDWATER ANALI'TICAL TESTING <br /> Soil and groundwater testing will be focused on determining existing conditions which may contribute to <br /> the observed pavement heave within the subdivisions. This will typically include soil property testing to <br /> determine existing geotechnical condition of both the lime-treated base materials and underlying native <br /> soils. Groundwater analyses will be to measure naturally occurring chemical compounds within the <br /> groundwater with the goal of identifying any potential natural soil/water interactions that may affect soil <br /> properties. Soils may naturally shrink or swell when they come into contact with water,and this potential <br /> will be investigated under this work scope. <br /> 3.1 Soil Testing Approach <br /> Soil parameters that may contribute to shrink/swell effects on soil will be measured on retrieved soil <br /> samples. Specific tests include: <br /> r • In-place moisture content and dry density <br /> 0 Atterberg limits <br /> ' ® Optimum moisture content <br /> • pH <br /> • Sulfate content(soluble) <br /> • Total sulfate <br /> • Sulfide content(soluble) <br /> • Total sulfide <br /> • Clay mineralogy by scanning electron microscopy(SEM)and x-ray diffraction(XRD) <br /> • Chloride content, and <br /> • Soil swell tests <br /> 3.2 Groundwater Testing Approach <br /> The intent of the shallow groundwater sampling is to determine if any physical or chemical <br /> component within groundwater may interact with the lime-treated soil or native soils leading to a <br /> potential for swelling. Field testing will include measuring field pH,conductivity,temperature and <br /> turbidity as the grab samples are retrieved from each location. Laboratory testing will include: <br /> • Major cations and anions <br /> ® Soluble sulfate concentrations <br /> C Sulfide concentrations <br /> • pH <br /> 0 Conductivity <br /> 4.0 QUALITY ASSURANCE OVERVIEW <br /> The following discussion presents the methods used to assure the quality and representativeness of the <br /> sampling program. <br /> 4.1 Certification <br /> All laboratory materials testing will be performed by a vendor certified through the state of California. <br /> This certification will be maintained in the project file after selection of the analytical testing laboratory. <br /> 4 <br />