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y <br /> I <br /> i4 1 <br /> FILE GOP ' <br /> Franklyn Cole <br /> Page 2 <br /> The draft analytical results of the groundwater samples from MW1 and MW3 are <br /> 510 parts per billion (ppb) and 260 ppb respectively, using EPA Method 8260. <br /> The results from the replacement MW1 are much higher than the results of the , <br /> original MW1. On April 21, 2000, the groundwater samples collected were not <br /> clear and contained silt. Additional development of the monitoring wells should <br /> occur prior to the next sampling of these.wells. The need for further site f <br /> investigation and remediation will be based on the data from the monitoring and <br /> drinking water wells. Confidence that the data is representative of site conditions <br /> is required in.the decision making process. If the drinking water wells are at risk, i <br /> these decisions must be made quickly. Therefore, all the monitoring and y <br /> drinking water wells should be sampled by June 10, 2000, and the results <br /> included in the quarterly report.that is to be submitted to PHSIEHD by July 10, <br /> 2000. <br /> If you have any questions contact me at (209) 468-3449. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> cf, <br /> Margaret Lagorio, Supervising REHS <br /> Site Mitigation Unit <br /> c: Advanced GeoEnvironmental - Bill Little <br /> CVRWQCB — Marty Hartzell <br />