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<br />' 13 July 2001
<br /> • AGE-NC Project No 96-0232
<br />' Page 4of15
<br />' by EPA Method 8260) at concentrations of 100µg/l, 140µg/1 and 41 ug/l, respectively, on 13 June
<br /> 2001,the influent water samples collected from extraction wells EW-2, EW-4, EW-5,EW-6, EW-7,
<br /> EW-8, EW-9 and EW-10 contained MTBE at concentrations less than 140µg/1 with an average of
<br />' 28µg/1 The laboratory analysis did not detect any other constituents of concern Analytical results
<br /> of pump- and-treat influent-water samples are summarized in Tables 1 and 6, laboratory reports are
<br /> in Appendix B
<br /> 2 5 TREATMENT CANISTER MONITORING
<br />' Water samples were collected on 09 April, 03 May and 13 June 2001 from intermediate sampling
<br /> ports located at the outlet of granular activated carbon (GAC) media vessel no 1 (GAC-1), at the
<br />' outlet of granular activated carbon media vessel no 2 (GAC-2) and at the outlet of the Sunsolve
<br /> media vessel no 1 (SS-1)
<br /> rLaboratory analysis of the 03 May 2001 water sample collected from the outlet of GAC-2 detected
<br /> MTBE(utilizing EPA Method 8260) at a concentration of 12 µg/l,no other petroleum constituents
<br /> of concern were detected from intermediate samples located at the outlets of GAC-1, GAC-2 and
<br /> SS-1 during the April, May and June 2001 sampling events Analytical results of pump-and-treat
<br /> intermediate-water samples are summarized in Table 1, laboratory reports are in Appendix B
<br /> 26 EFFLUENT MONITORING
<br /> In accordance with the requirements of RWQCB 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, nitrate and total lead on 09 April, 03 May
<br /> and 04 June 2001, additionally, ground water pump-and-treat effluent quarterly sampling for
<br /> bioassay analysis was performed on 18 June 2001
<br /> Laboratory analysis of pump-and-treat effluent grab water samples collected on 09 April, 03 May
<br /> and 04 June 2001 did not detect any petroleum constituents of concern, nitrate as NO, was detected
<br /> at concentrations of 41 milligrams per liter(mg/L), 36 mg/L and 50mg/L, respectively, TDS values
<br /> were reported at 620 mg/L, 610 mg/L and 620 mg/L,respectively Analytical results are summarized
<br /> 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 18 June 2001 The analysis utilized sample factors of 0 milliliter(ml), 125 ml, 500 ml, 1,000 ml,
<br /> 1,500 ml and 2,000 ml Each sample factor was tested with 20 Fathead minnow fish and a dilution
<br /> Advanced GeoEnvironmental,Inc
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