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M r • <br /> I <br /> I <br /> Srikanth Dasappa <br /> Page 2 <br /> i <br /> The downgradient wells that have recently indicated contamination i <br /> (monitoring wells #3, #4, and #6) must continue to be sampled for gasoline k <br /> constituents on a quarterly basis. in addition, monitoring we11 #8 must also <br /> be sampled-for gasoline constituents on a quarterly basis. <br /> r <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 I <br /> evidence of contamination, and to ensure that the wells are in good repair and <br /> remain sealed. <br /> l <br /> Monitoring wells #l, #2, #5 and #7 roust be sampled for gasoline <br /> constituents on a semi-annual basis at this time. <br /> h <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, REHS, of my staff at (209y. <br /> 468-3441. <br /> Jogi Khanna, NTO., M.P.H. <br />` Health Officer <br />'i urie A. Cotulla, REHS, Program Manager <br /> nvironmental Health Division <br /> LAC/LT:lb <br /> c: CVRWQCB-Beth Thayer <br /> USA Petroleum-Chuch Nichols <br /> k <br /> /C.' <br /> Western Geo-Engineers-Jack Napper <br />.a <br />-4 <br /> k <br /> P <br />{ <br />