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As passive groundwater monitoring is a very long term approach and may ultimately prove to be ineffective <br /> in reaching nondetectable levels, PHS/EHD does not recommend it as a viable cleanup alternative. In <br /> addition,the State Water Resources Control Board Cleanup Fund does not consider groundwater monitoring <br /> a cleanup approach and will not reimburse tank owners for costs associated with this alternative. <br /> PHS/EHD has not received a quarterly monitoring report on this site since January of 1993. The modified <br /> sampling schedule suggested in your letter is not adequate. Monitoring wells MW#1, MW#2, and MW#4 <br /> must be monitored for gasoline on a quarterly basis. Monitoring well MW#3 may be monitored for gasoline <br /> on a semi-annual basis at this time.However,all four wells must be monitored for depth to water information <br /> on a quarterly basis. In addition, the quarterly monitoring report should include the results of the water <br /> sampling from the Tracy municipal well located nearby. <br /> A workplan to investigate the shallow soils in and around the former tank pit area and to identity the <br /> groundwater contaminant plume must be submitted to PHS/EHD by September 27, 1993. <br /> The data generated from this investigation should be used to compile a Corrective Action Plan (CAP), <br /> described in detail in the February 8, 1993 letter. A CAP for this site must be submitted to PHS/EHD by <br /> February 21, 1994. <br /> If you have any questions or would like to discuss this letter in more detail, please contact Linda Turkatte, <br /> Senior REHS,of my staff at (209) 468-3441. <br /> Jogi Khanna, M.D., M.P.H. <br /> Health Officer <br /> Donna Heran, RENS, Program Manager <br /> Environmental Health Division <br /> DH/LT:lb <br /> c: Beth Thayer-CVRWQCB <br /> C. Ray Kablanow-Geologicai Technics, Inc. <br />