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09 May 2002
<br /> AGE-NC Project No 96-0232
<br /> Page 12 of 18
<br /> • Volatile organic compounds by EPA Method 8260,
<br /> • Semi-volatile organic compounds by EPA Method 8270,
<br /> • Dioxin and dibenzof Iran congeners by EPA Method 1613,
<br /> • Pesticides and polychlorinated bi-phenols (PCBs) by EPA Method 8080
<br /> • Inorganic compounds including Aluminum,Antimony,Arsenic,Asbestos,Barium,Beryllium,
<br /> Cadmium, total Chromium, Chromium VI, Copper, Cyanide, Fluoride, Iron, Lead, Mercury,
<br /> Manganese, Nickel, Selenium, Silver, Thallium, Tributyltin and Zinc by various EPA
<br /> Methods,
<br /> • General mineral constituents including Ammonia,Chloride,Hardness,Foaming Agents,Nitnte
<br /> as Nitrogen, total Phosphorus, Sulfate, Sulfide and Sulfite by various EPA Methods
<br /> Because of lengthy laboratory turn-around times, AGE will submit the above analytical results and
<br /> tabulation as an addendum to this quarterly report
<br /> 6.0 SUMMARY OF FINDINGS FROM QUARTERLY ACTIVITIES
<br /> Previous soil characteristics data obtained by a CPT investigation enabled AGE to define five
<br /> informal hydrologic units (Final Remediation Plan, dated 31 August 2000) The informal
<br /> hydrogeologic units were defined as First Zone (5-35 feet bsg), Second Zone (40-60 feet bsg),
<br /> Rocky's Upper Zone (65-75 feet bsg), Secondary Aquifer Zone (85-105 feet bsg), and Primary
<br /> Aquifer Zone (130-150 feet bsg) The Rocky's Upper Zone was the shallowest groundwater zone
<br /> screened in the Rocky's domestic drinking water well
<br /> The results of pump and treat ground water remediation between 01 January and 31 March 2002 are
<br /> as follows
<br /> • Approximately 3,054,581 gallons of MTBE-impacted ground water were continuously
<br /> extracted from wells EW-4,EW-5, EW-9 and EW-10,which are completed in the First Zone
<br /> aquifer(Appendix B, Table 8)
<br /> • A total volume of approximately 12,897,113 gallons of MTBE-impacted water has been
<br /> treated at the site since the start-up period in November 2000 (Table 8)
<br /> • Dissolved MTBE was detected (utilizing EPA Method 8260M) in water samples collected
<br /> from extraction wells EW-4, EW-5, EW-6, EW-8, EW-9 and EW-10 at concentrations
<br /> between 1 8 and 100 pg/l,the greatest MTBE-impacted water was collected from extraction
<br /> is well EW-4 near the southwest comer of the site From the December 2001 to the March 2002
<br /> Advanced GeoEnveronmental,Inc
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