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' 09 May 2003
<br /> AGE-NC Project No 96-0232
<br /> tPage 4of16
<br /> t2 4 INFLUENT MONITORING RESULTS
<br /> In accordance with the requirements ofRWQCB Monitoring and Reporting Program No 5-00-119,
<br />' ground water pump-and-treat influent samples were analyzed for TPH-g, TPH-d, BTEX, MTBE,
<br /> methanol, ethanol, DIPE, TAME, ETRE, TBA, 1,2-DCA and EDB
<br />' Influent water samples collected on 27 January, on 24 February and on 25 March 2003 detected
<br /> MTBE (by EPA Method 8260) at concentrations of 21 micrograms per liter (µg/l), 41 µg/1 and
<br /> 83 gg/l, respectively (Table 1) The laboratory analysis did not detect any other petroleum
<br />' constituents of concern Analytical results ofpump-and-treat influent-water samples are summarized
<br /> in Table 1, laboratory reports are in Appendix B
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<br /> 25 EFFLUENT MONITORING RESULTS
<br /> IIn accordance with the requirements ofRWQCB Monitoring and Reporting Program No 5-00-119,
<br /> monthly ground water purnp-and-treat effluent monitoring was performed for flow rate, specific
<br /> • conductivity(EC), pH, temperature, total dissolved solids (TDS), TPH-g, TPH-d, BTEX, MTBE,
<br /> methanol, ethanol,DIPE, TAME, ETBE, TBA, 1,2-DCA, EDB and nitrate, in addition, a bioassay
<br /> was performed on the quarterly effluent sample collected on 25 March 2003
<br /> Laboratory analysis of pump-and-treat effluent grab water samples collected on 27 January, on
<br /> 24 February and on 25 March 2003 did not detect any petroleum constituents of concern, however,
<br /> nitrate as NO3 was detected on the above dates at concentrations between 36 mg/1 and 46 mg/l,and
<br /> TDS values were reported at concentrations between 530 mg/1 and 569 mg/1 Analytical results are
<br /> summarized in Tables 1 and 2, laboratory reports are in Appendices B and C
<br /> A bioassay laboratory analysis was performed on the grab sample collected from the effluent stream
<br /> on 25 March 2003 The analysis utilized sample factors of 0 milliliter (ml), 125 ml, 500 ml,
<br /> 1,000 ml, 1,500 ml and 2,000 ml Each sample factor was tested with 20 Fathead minnow fish and
<br /> a dilution volume of 2,000 ml of di-ionized water, pH, dissolved oxygen (DO) and temperature
<br /> Parameters were monitored and fish mortalities were counted over 96 hours The results of the
<br /> bioassay analysis did not indicate any trends for pH, DO or temperature over the 96 hour period
<br /> Temperature measurements generally vaned between 19 9 and 20 7 degrees Celsius (°C), pH
<br /> measurements generally vaned between 7 50 and 8 40 and DO measurements generally varied
<br /> between 8 40 mg/1 and 9 50 mg/l The laboratory reported that there were two fish mortalities after
<br /> 96 hours in the above referenced sample, laboratory analysis of a duplicate effluent sample also
<br /> reported two fish mortalities after 96 hours The bioassay analysis is summarized in Table 3,
<br /> laboratory reports are in Appendix C
<br /> Advanced GeoEn"ronmental,Inc.
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