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, L FROM CVRLJIQCB TEL: 916 255 3015 MP-, 18. 1998 2:38 PM P 3 <br /> II <br /> Town and Country-Chevron -2? 5/18198 <br /> San.loaquin County <br /> be extended another 30 R bgs or to round wate which ever is reached first. If ground water is <br /> encountered,the above analyses are required Iso sec enclosed letter concerning oxygenates). <br /> In addition to the sampling protocol described in the amended workplan, the investigation must include <br /> t the use of a Photo lonization Detector(PID) for continuousscreening of the borehole fur'contasnination. <br /> Soil samples must be collected where high Y'1D readings aro noted. <br />+ Page 2,paragraph 3 of the amended workplan states the possibility of encountering ground water is <br /> remote_ Also, il`ground water is encountered a determination will be' made concerning whether it is <br /> perched water or the static ground water level. if it is'the static ground water level,then a monitoring <br /> well will be installed,after the client's approval. Board staff do not'agroe that the client should <br /> determine whether a monitoring well should be installed.' <br /> Whether the water is perched or the static ground water level,once the iresults are reported,we can meet <br /> to detennine whether the investigation,including the installation of Monitoring wells, is needed to <br /> determine the lateral and vertical extent of ground water contamination. <br /> The results of this investigation must be submitted to me at this office and Mr. JeiY Wang, San Joaquin <br /> County Environmental Health Department by 31 July' 1998. <br /> I <br /> i If there are any questions,please call me at(91 G)2557:3128 <br /> i <br /> PATRICIA A.ANDERSON � <br /> cc: Mr. Frank Goldman,C3eosoly,Y.LC.,Sonoma <br /> Mr. Jeff Wong, San Joaquin County Environmental Health, Stockton <br /> i <br /> F <br />