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. 30 July 2004
<br /> AGE-NC Project No 96-0232
<br /> Page 4 of 16
<br /> Receiving water samples were logged on a chain of custody form,placed in a chilled container and
<br /> transported to a DHS-certified laboratory for analysis for
<br /> • Total dissolved solids by EPA Method 160 1 (quarterly sampling frequency), and
<br /> • Turbidity by EPA Method 180 1
<br /> 2 4 INFLUENT MONITORING RESULTS
<br /> In accordance with the requirements of RWQCB Monitoring and Reporting Program No 5-00-119,
<br /> ground water pump-and-treat influent samples were analyzed for TPH-g, TPH-d, TPH-mo,BTEX,
<br /> methanol, ethanol, MTBE, DIPE, TAME, ETBE, TBA, 1,2-DCA, EDB and total lead (quarterly
<br /> basis) on 14 April, 13 May and 15 June 2004
<br /> Influent water samples collected on all three ofthe above monthly monitoring events detected MTBE
<br /> (by EPA Method 8260) at concentrations of 16 micrograms per liter (µg/1), 19 µg/1 and 15 µg/1,
<br /> respectively (Table 1) The laboratory analysis did not detect any other petroleum constituents of
<br /> concern Analytical results of pump-and-treat influent-water samples are summarized in Table 1,
<br /> laboratory reports are in Appendix B
<br /> 25 EFFLUENT MONITORING RESULTS
<br /> In accordance with the requirements ofRWQCB Monitoring and Reporting Program No 5-00-119,
<br /> monthly ground water pump-and-treat effluent monitoring was performed for flow rate, specific
<br /> conductivity(EC),pH,temperature,total dissolved solids(TDS),TPH-g,TPH-d,TPH-mo,BTEX,
<br /> methanol, ethanol, MTBE,DIPE, TAME, ETBE, TBA, 1,2-DCA, EDB and nitrate on 14 April,on
<br /> 13 May and on 15 June 2004, in addition, a bioassay was performed on the quarterly effluent sample
<br /> collected on 15 June 2004
<br /> Laboratory analysis of pump-treat effluent grab water samples collected on all three of the above
<br /> monthly momtonng events did not detect any petroleum constituents of concern Analytical results
<br /> are summarized in Table 1, laboratory reports are in Appendix B
<br /> Nitrate as NO3 was detected on all three of the above monthly monitoring events at concentrations
<br /> of 42 mg/l, 42 mg/1 and 44 mg/l, respectively, TDS values were reported on the same dates at
<br /> concentrations of 698 mg/l,779 mg/1 and 668 mg/l,respectively Analytical results are summarized
<br /> in Table 2, laboratory reports are in Appendix C
<br /> Advanced GeoEnvwonmental,Inc
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