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L <br /> GRANITE CONSTRUCTION FACILITY <br /> March 17, 1997 <br /> Page 4 <br /> May 11, 1995 - Groundwater monitoring wells MW 1 - MWS were sampled. <br /> Analysis of water samples collected from MW 1 - MW3 revealed <br /> elevated concentrations of TPH as gasoline ranging from 570 µg/( <br /> to 2600 µg/1. No detectable concentrations of TPH as gasoline, <br /> diesel, or BTEX were detected in wells MW4 - MW 8. <br /> May 31, 1995 - We petitioned San Joaquin County to change sampling <br /> requirements. TPH as diesel was no longer required. <br /> August 10, 1995 - Groundwater monitoring wells MW 1 - MWS were sampled. <br /> Analysis of water samples collected from MW 1 -MW3 revealed <br /> elevated concentrations of TPH as gasoline ranging from 220 µg/l <br /> to 650 µg/1. No detectable concentrations of TPH as gasoline, <br /> diesel, or BTEX were detected in wells MW4 - MW8. <br /> December 6, 1995 - Groundwater monitoring wells MW 1 - MW8 were sampled. <br /> Analysis of water samples collected from MW 1 -MW3 revealed <br /> elevated concentrations of TPH as gasoline ranging from 210 µg/1 <br /> to 520 µg/1. No detectable concentrations of TPH as gasoline, <br /> diesel, of BTEX were detected in wells MW4 -MW8. <br /> 1996 <br /> March 15, 1996 - Quarterly groundwater monitoring requirements were changed. <br /> Monitoring well MW 1- MW3 were to continue being sampled <br /> quarterly, wells MW4 and MW8 were alternating semi-annual <br /> sampling, MW5 and MW6 discontinue sampling, and MW7 annual <br /> sampling. <br />