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a <br /> 1 <br /> Srikanth Dasappa <br /> Page 2 E <br /> The downgradient wells that have recently indicated contamination <br /> (monitoring wells #3, #4, and #6) must continue to be sampled for gasoline <br /> constituents on a quarterly basis. an addition, monitoring well #8 must also <br /> be sampled for gasoline constituents on a quarterly basis. <br /> All wells at the site must be monitored on a quarterly basis for depth to water <br /> information for gradient flow direction determinations,for olfactory and visual <br /> evidence of contamination, and to ensure that the wells are in good repair and <br /> remain sealed. <br /> l <br /> Monitoring wells #1, #2, #5 and #7 must be sampled for gasoline <br /> i constituents on a semi-annual basis at this time. <br /> As more data is collected, future modifications to this sampling plan may be warranted. <br /> Additional requests for sampling modifications should be submitted in writing to PHS/EHD <br /> for review and concurrence. <br /> If you have any questions, please'contact Linda Turkatte, RENS, of my staff at (209) <br /> 468-3441.. <br /> i <br /> Jogi KhannaM, ., M.P.H. <br /> Health Officer <br /> u ie A. Cotulla, RENS, Program Manager <br /> nvironmental Health Division <br /> LAC/LT:lb <br /> c: CVRWQCB-Beth Thayer <br /> c: USA Petroleum-Chuck Nichols <br /> c: Western Geo-Engineers-Jack Napper <br /> r ' <br /> f ' <br /> I <br />