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9000030A11 CON-29 <br /> 5.0 <br /> DATA INTERPRETATION AND PREPARATION OF REPORT <br /> 5.1 DATA ANALYSIS <br /> The results of the chemical analyses will be compared to existing <br /> guidelines to ascertain whether the observed concentrations pose a hazard <br /> in the soil or a threat to groundwater from leaching. It is anticipated <br /> that at least three comparisons will be made for this assessment. <br /> First, the measured concentrations will be compared to existing <br /> regulatory standards. Soils containing concentrations of metals or organic <br /> compounds exceeding the TTLC or STLC may be regarded as a hazardous waste <br /> and may require some remediation. Concentrations for metals and organic <br /> compounds (where appropriate) will be compared with the above standards. <br /> Second, the measured total and extractable concentrations will be <br /> compared to designated concentrations levels using the procedure outlined <br /> in Marshak (1989) . This document was produced by the RWQCB - Central <br /> Valley Region. It contains guidance on determining the degree to which a <br /> contaminated site should be cleaned or to determine when remedial action is <br /> necessary. <br /> Third, the total soil concentrations will be compared to suggested <br /> agricultural application rules. The lithologic data will be integrated <br /> with available published data regarding groundwater occurrence and depth to <br /> assess the possible migration of soil constituents to groundwater. How- <br /> ever, without site-specific information regarding depth to groundwater, <br /> such interpretations will remain tentative. <br /> 5-1 <br />