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1 I August 2003 • AGE-NC Project No 96-0232 ' Page 4 of 15 respectively (Table 1) The laboratory analysis did not detect any other petroleum constituents of concern Analytical results of pump-and-treat influent-water samples are summarized in Table 1, laboratory reports are in Appendix B r 25 EFFLUENT MONITORING RESULTS In accordance with the requirements of RWQCB Monitoring and Reporting Program No 5-00-119, monthly ground water pump-and-treat effluent monitoring was performed for flow rate, specific conductivity (EC), pH, temperature, total dissolved solids (TDS), TPH-g, TPH-d, BTEX, MTBE, methanol, ethanol, DIPE, TAME, ETBE,TBA, 1,2-DCA, EDB and nitrate, in addition, a bioassay was performed on the quarterly effluent sample collected on 25 March 2003 ' Laboratory analysis of pump-and-treat effluent grab water samples collected on 21 April and on P P 14 May did not detect any petroleum constituents of concern, however, MTBE was detected from the effluent grab sample collected on 25 June 2003 at a concentration of 0 78 µg/I The effluent was resamp led on 07 July 2003,and the laboratory reported a non-detectable level for MTBE Analytical • results are summarized in Table 1, laboratory reports are in Appendix B Nitrate as NO3 was detected on all three above dates at concentrations between 3 8 mg/l and 46 mg/l, TDS values were reported at concentrations between 581 mg/l and 620 mg/1 Analytical results are summarized in Table 2, laboratory reports are in Appendix C A bioassay laboratory analysis was performed on the grab sample collected from the effluent stream on 25 June 2003 Six 2,000-m1 dilution volumes consisting of 0%, 6 25%, 25%, 50%, 75% and 100% effluent water to deionized water were tested with 20 Fathead minnow fish each, pH, dissolved oxygen (DO) and temperature parameters were monitored and fish mortalities were counted over 96 hours Temperature measurements generally vaned between 20 4 and 20 8 degrees Celsius ('C), pH measurements generally varied between 7 50 and 8 60 and DO measurements generally vaned between 6 50 mg/l and 9 00 mg/l The laboratory reported that there were two fish mortalities after 72 hours and five fish mortalities after 96 hours in the above referenced sample, laboratory analysis of a duplicate effluent sample also reported a total of eight fish mortalities after 96 hours The laboratory report concluded that there was no significant mortalities observed in the test The bioassay analysis is summarized in Table 3, laboratory reports are in Appendix C Utilizing an ICM water analyzer in the field, EC values were monitored on 21 April, 14 May and 25 June 2003 at concentrations between 499 µmhos/cm and 636 µmhos/cm, pH values were monitored at between 7 20 and 7 36, and temperature values were recorded at between 18 3 °C and 20 5 °C, respectively Field monitoring results are summarized in Table 2 Advanced GeoEnvironmental,Inc