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Dante Nomellini <br /> Page 2 <br /> All wells on the site must be monitored on a quarterly basis for <br /> depth to water data for determining groundwater flow patterns at <br /> the site , to verify free product removal progress and to ensure <br /> that the wells at the site are still in good repair . Monitoring <br /> well # 5 , located in one of the identified downgradient <br /> directions , must continue to be sampled for contaminants on a <br /> quarterly basis in order to effectively monitor the migration of <br /> the plume in that direction . When monitoring well # 7 is <br /> installed in the other identified downgradient direction , it too <br /> will need to be sampled for contaminants on a quarterly basis . <br /> The sampling for contaminants in monitoring well # 3 may be <br /> reduced to yearly at this time as concentrations in this area may <br /> be inferred from monitoring well # 6 . <br /> Monitoring wells # 4 and # 6 may currently be sampled for <br /> contaminants on a semi - annual basis as there are unlikely to be <br /> any significant changes in contaminant concentrations over a six <br /> month period of time . <br /> For monitoring wells # 3 , # 4 and # 6 , at least one sampling event <br /> should occur during the spring quarter in order to obtain <br /> contaminant concentration data when the water table should be at <br /> its highest level . <br /> Please be advised that as additional monitoring wells are <br /> installed and as additional data becomes available , modifications <br /> to this sampling plan may be needed and requested . <br /> If you have any questions , please contact Linda Turkatte , REHS , <br /> of my staff at ( 209 ) 468 - 0339 . <br /> Jogi Khanna , 1A . D . , M . P . H . <br /> Health Off ' ce <br /> 04 <br /> Laurie A . Cotulla , REHS , Program Manager <br /> Environmental Health Division <br /> i <br /> LAC / LT : lb <br /> c : CVRWQCB - Beth Thayer <br /> c : Artesian Environmental -Jim Jacobs <br /> i <br /> f <br />