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THE SAN JOAQUIN COMPANY INC. <br /> 1 120 HOLLYWOOD AVENUE,SUITE 3,OAKLAND,CALIFORNIA 94602 <br /> SUMMARY OF RECOMMENDATIONS <br /> FOR <br /> FUTURE GROUNDWATER-QUALITY MONITORING <br /> NAVARRA SITE,7500 WEST ELEVENTH STREET,TRACY <br /> 1.MONITORING OF GROUNDWATER QUALITY IN THE PRIMARY AND SECONDARY PLUMES <br /> Sampling Frequency: Annually <br /> Next Sampling Round: July, 2007 <br /> Samples to be recovered from the following wells: <br /> Wells along the Long Axis of the Principal Plume <br /> MW-3, MW-13, MW-7,MWFP-3,MW-14,MW-16, MW-18, MW-1.1,MW-19 <br /> Wells around the Periphery of the Principal Plume <br /> MW-2, MW-5, MW-17, MW-4, MW-10 <br /> Additional Wells in the Interior of the Principal Plume <br /> MWFP-1, MWFP-2, MWFP-4, MWFP-5 <br /> Well in the Secondary Plume <br /> MW-12 <br /> Rationale: Monitoring optimization analysis recommended by US-EPA and <br /> Cal-EPA has demonstrated that annual sampling is maximum <br /> required to obtain statistically-significant data. More frequent <br /> sampling adds nothing to scientific understanding of contaminant <br /> fate and transport. <br /> Note: If an extended program of monitoring is required, all wells not cited above should be <br /> sampled in July 2008 and biannually thereafter. <br /> TELEPHONE:OAKLAND, CALIFORNIA(51 0)336-9118 TRACY,CALIFORNIA(209)832-29 10 <br />