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• 09 May 2002
<br /> AGE-NC Project No 96-0232
<br /> Page 5of18
<br /> Influent water samples collected on the above dates detected MTBE (by EPA Method 8260) at
<br /> concentrations of 41 pg/l, 29 pg/l and 12 µg/1, respectively (Table 1) The laboratory analysis did
<br /> not detect any other constituents of concern Analytical results of pump-and-treat Influent-water
<br /> samples are summarized in Table 1, laboratory reports are in Appendix C
<br /> 35 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 /> MTBE,methanol, ethanol, DIPE, TAME,ETBE, TBA and nitrate on 03 January, 04 February and
<br /> 27 March 2002, additionally,total lead was analyzed for the March 2002 sampling event and ground
<br /> water pump-and-treat effluent quarterly sampling for bioassay analysis was performed on 31 March
<br /> 2002
<br /> Laboratory analysis of pump-and-treat effluent grab water samples collected on 03 January, 04
<br /> February and 27 March 2002 did not detect any petroleum constituents of concern(Table 1), nitrate
<br /> . as NO3 was detected at concentrations of 49 milligrams per liter (mg/1), 44 mg/1 and 52 mg/l,
<br /> respectively, TDS values were reported at 630 mg/l,630 mg/1 and 800 mg/l,respectively Analytical
<br /> results are summarized in Tables 1 and 2, laboratory reports are in Appendices C and D
<br /> A bioassay laboratory analysis was performed on the grab sample collected from the effluent stream
<br /> on 31 March 2001 The analysis utilized sample factors of 0 milliliter(ml), 125 ml, 500 ml, 1,000
<br /> ml, 1,500 ml and 2,000 ml Each sample factor was tested with 20 Fathead minnow fish and a
<br /> 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 bioassay analysis
<br /> generally reported a steady decrease in pH and DO in each sample factor over the 96 hour period,
<br /> the analysis reported increasing pH and DO values with increasing sample factors Temperature
<br /> measurements varied between 20 0 and 20 7 degrees Celsius(°C) The laboratory reported that there
<br /> were no fish mortalities after 96 hours In the above referenced sample, laboratory analysis of a
<br /> duplicate sample reported one fish mortality after 96 hours The bioassay analysis is summarized in
<br /> Table 3, laboratory reports are in Appendix D
<br /> Utilizing an ICM water analyzer in the field,EC values were monitored on 03 January, 04 February
<br /> and 27 March 2002 at 1,178 µmhos/cm,921 µmhos/cm and 716 µmhos/cm,respectively,pH values
<br /> were monitored at 7 06, 7 12 and 7 73,respectively, and temperature values at 19 0°C, 20 3 °C and
<br /> 21 7 °C, respectively Field monitoring results are summarized in Table 2
<br /> Advanced GeoEnvi ron mental,Inc
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