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23 December 2005 <br /> AGE-NC Project No 95-0103 <br /> Page 2 of 7 <br /> water was purged or evacuated from the following wells MW-I through MW-5,EW-1 through EW- <br /> ' 3 and vapor wells VE-1 and VE-6 While purging,the ground water was continually monitored for <br /> oxidation reduction potential (OPR), dissolved oxygen (DO)content, pH, conductivity and water <br /> temperature within a 500-m1 flow cell which housed the YSI 556 multi parameter meter, which <br /> electronically collected and stored all data points every 30 seconds The purge was determined to be <br /> completed when parameters stabilized, typically after two-gallons of ground water were removed, <br /> ' the field measurements are Included in Appendices B and C <br /> At the end of the purge cycle,the end of the disposable tubing was fitted with an in-line 0 45-micron <br /> water filter and then utilized to collect ground water samples at a rate of approximately 300-m1 per <br /> minute Samples were containerized Immediately in 40-m1 EPA-approved VOA vials containing <br /> 0 5 ml of 18%hydrochloric acid as a sample preservative, 1-liter amber containers and 1-liter plastic <br /> ' containers without preservative <br /> The samples were properly labeled and transported in a chilled container under chain-of-custody to <br /> ' Cal Tech Environmental Laboratories, Inc (CTEL) a California Department of Health Services <br /> (DHS)-certified laboratories, for analysis The ground water samples were analyzed for <br /> ' • TPH-g in accordance with EPA Method 8015 Modified, <br /> • BTEX and the fuel additives TBA, DIPE, ETBE, TAME, MTBE, 1,2-DCA, and EDB in <br /> ' accordance with EPA Method 8260B <br /> The sample collected in October were analyzed for <br /> • Dissolved oxygen, carbon dioxide, pH, alkalinity, conductivity, hardness, soluble Iron and <br /> redox potential,,nitrate, nitrite, sulfate, sulfide, manganese, ferrous Iron, soluble Iron, <br /> chloride, phosphate, calcium, sodium and potassium and total organic content (TOC) and <br /> chemical oxidation demand (COD) in accordance with EPA Methods <br /> 3,0, FINDINGS <br /> i <br /> Ground water flow direction and gradient was determined from the field data collected on 10 August <br /> and 25 October 2005, the contaminant and geo-chemical condition of ground water on the above <br /> ' dates was assessed from laboratory data <br /> ' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> Geochemical parameters of ground water collected during well purging were used to evaluate low- <br /> ' Advanced GeoEnvironmental,Inc <br /> 1 <br />