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LEVI N E•FRICKE <br /> chlorinated herbicides for weed control ;along the power <br /> transmission lines was indicated by the sampling and analysis <br /> results. Finally, no evidence of the migration of volatile <br /> organic compounds or petroleum hydrocarbons onto the Site from <br /> the Tsutsui property through ground water" was indicated by the <br /> sampling and analysis results_ <br /> �i <br /> n <br /> !3 <br /> 14.0 RECOMMENDATIONS <br /> 1 ; <br /> Further investigation of the possible presence of elevated <br /> concentrations of diesel fuel in ground water in the vicinity of <br /> the former fuel tank location is recommendedi It is our <br /> -� experience that, in such cases, ' at least'� one ; ground-water <br /> .monitoring well is generally required by! the RWQCB to obtain <br /> quantitative results of ground-water quaiity;� and to .monitor <br /> concentration trends of fuel and fuel constituents with time. <br /> Since monitoring wells have been recommended : to further <br /> investigate fuel-related ground water impacts at the Brookside. <br /> Ranch site, it is recommended that the well in this area (the <br /> Ripkin site) be installed concurrently in" order to minimize <br /> overall costs associated with mobilization and demobilization of <br /> equipment and staff, and scheduling. <br /> The area near the Quonset but affected by DDT-related compounds <br /> above the TTLC has, in our opinion, beenj1defined sufficiently to <br /> 11 enable decision-making regarding the appropriate action to <br /> l <br /> address this concern. We recommend thatj�these soils either be <br /> redistributed in the area to reduce the overall concentration <br /> below the TTLC value, with the consent and approval of the DOHS <br /> (the lead agency in such cases) , or that4Ithealaffected area be <br /> excavated and the soils removed to a Class -I ,landfill. In either <br /> case, follow-up analysis will be required tofdocument successful <br /> cleanup/reduction of concentrations to below hazardous levels. <br /> {1 <br /> p <br /> 15.0 LIMITATIONS <br /> The conclusions and recommendations presented in this report are <br /> professional opinions based on the specific activities conducted <br /> and information obtained through the Environmental Assessment as <br /> described above, and are therefore dependant !�on the quality of <br /> ` information obtained. Levine- Fricke makes no guarantees or <br /> warranties with respect to the accuracy or completeness of this <br /> information. Opinions and recommendations presented herein apply <br /> to site conditions existing at the time of our assessment, and <br /> I� cannot necessarily be taken to apply to site{changes or condi- , <br /> h tions of which we are not aware and havej'not 'had the opportunity <br /> i <br /> to evaluate. <br /> .i <br /> i� i <br />