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r <br /> = San Joaquin County, Local Oversight Program <br /> March 19, 2001 <br /> Page 4 <br /> Monitoring wells that meet the following three criteria will be dropped from the monitoring <br /> program: <br /> Monitoring wells that have been persistently reported as not detected or less than 1.2 <br /> 1�1 times the detection limit for TPH-gasoline since 1998. <br /> k <br /> Monitoring wells with benzene reported in fewer than 25% of the samples exceeding the <br /> detection limit and never exceeding 5.0 :g/L since I998. <br /> Monitoring wells with MtBE never exceeding the secondary drinking water standard of <br /> 5.0 :g/L(and consequently never exceeding the primary drinking water standard of 13 <br /> g/L)since 1998. <br /> E Monitoring wells that meet the above three exclusion criteria are indicated in the following , <br /> matrix: <br /> Well l Criteria THP-g Benzene MtBE <br /> a <br /> MW-1 YES YES YES <br /> MW-2 YES YES YES <br /> } <br /> MW-3 YES YES YES <br /> MW-4 NO NO NO <br /> MW-5 NO NO NO <br /> MW-6 YES YES YES <br /> MW-7 YES YES YES <br /> MW-8 NO NO NO <br /> The basic for these determinations is included in Table D in Attachment D. <br /> The Customer Company will continue to have water levels monitored in all eight monitoring <br /> wells. <br /> MW-4 will continue to be monitored by The Customer Company for fuel constituents. <br /> As shown in the previous section closely spaced monitoring wells MW-5 and MW-8 experienced <br /> f' a mid-year 2000 appearance and/or rise in concentration of TPH-gasoline and MtBE. The <br /> Customer Company is of the opinion that this is due to an unknown post 1998 event and is , <br /> therefore the responsibility of the owners of record at the time of the unknown event. The <br /> - Customer Company will no longer monitor wells MW-5 and MW-8. <br /> H2OGEOL A GROUNDWATER COf4SULTANCr <br />