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!rte rte. <br /> 5157 W. Business Loop 205, Tracy <br /> Page 2 <br /> Groundwater analysis for TPH, MTBE, and BTEX has been performed on <br /> samples from all 12 monitoring wells since they werei'first constructed. Analysis <br /> of these constituents shall be continued. <br /> Groundwater samples from MW-1 through MW-4 have been analyzed for ETBE, <br /> TAME, DIPE, and TBA for only six quarters and EDB and 1',2 DCA for only one <br /> quarter. Groundwater samples from MW-5 & 6 have been analyzed for ETBE, <br /> TAME, DIPS, TBA, EDB and 1,2 DCA only once. Groundwater samples from <br /> MW-7 through MW-12 have not been analyzed for ETBE, TAME, DIPE, TBA, <br /> EDB and 1,2 DCA. Therefore, groundwater samples from all the monitoring <br /> wells should be analyzed for ETBE, TAME, DIPE, TBA, EDB and 1,2 DCA (in <br /> addition to TPH, BTEX and MTBE) for a minimum of two quarters of <br /> groundwater sampling. If the results after two quarters of sampling for the ETBE, <br /> TAME, DIPE, TBA, EDB�and 1,2 DCA are non-detect':(ND) using appropriate <br /> methods and detection limits, they can be eliminated from the suite of analytes <br /> G being tested. <br /> If you have any questions, please contact Frank Girardi at (209) 953-7868. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Frank Girardi , Senior REHS "'Margare Lagorio, REHS <br /> LOP/Site Mitigation Unit IV Program Coordinator <br /> Ila c: Advanced GeoEnvironmental Inc. _ Brian Millman <br /> c: RWQCB, Central Valley Region - Jim Barton <br />