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Page 2 February 9, 2010 <br />the retort water sampled near the portal. However, no BTEX was detected in the settling pond and TPH <br />was present in a concentration of 2.3 mg/L. <br />WWL inspects and monitors the pond condition and the leak detection vault on a monthly basis. <br />Although water has been observed in the bottom sump of the vault on several occasions, typically after <br />a rain or during the rainy season (mid July through August), water has never been observed to be <br />discharging from any of the 3 leak detection header pipes coming into the vault. The water observed in <br />the bottom sump has been attributed to precipitation entering the vault through open cracks in the <br />cement collar through a vent hole in the vault cap. The following observations by WWL preceded this <br />notification. <br />November 5, 2009: Water was observed in the vault in the fall of 2009, but well below the detection <br />system header pipes, again no flow was observed from the pipes. <br />December 2, 2009: Water was still present but at a higher level. Ten gallons of water was bailed from <br />the vault and disposed of in the pond, and a water-proof cover was installed over the vault. <br />January 13, 2010: Water in the vault was observed at a level of approximately 2 to 3 inches above the <br />detection pipes, and water was pumped to near the bottom of the vault and discharged into the pond. <br />Pumping was conducted for approximately 2.5 hours at a rate of about 8 to 10 gallons per minute. <br />January 21, 2010: Water in the vault was observed at a level of approximately 6 inches above the <br />detection pipes, and water was pumped to near the bottom of the vault and discharged into the pond. <br />Pumping was conducted for approximately 2.5 hours at a rate of about 8 to 10 gallons per minute. <br />January 27, 2010: Water in the vault was approximately 4.4 feet deep (at least 1 foot above the <br />detection pipes). Approximately 600 gallons of water was pumped in a period of 1 hour and 25 <br />minutes. A water sample was collected for analysis. An automated direct current pump system and <br />pressure transducer were installed in the bottom of the sump. <br />January 29, 2010: The automated pump system was working well. Pressure transducer data were <br />downloaded. Data showed that the average pump cycle is approximately 4 hours (30 to 40 minute <br />pumping period, followed by 3 to 3.25 hour filling of sump). Flow was measured from the 3 leak <br />detection pipes: East pipe flow was 0.227 gpm; South pipe flow was0.023 gpm; and no flow was <br />present from West pipe. A recharged battery was connected to the pump system. <br />February 2, 2010: The automated pump was working well. East pipe flow was measured at 800 ml/min <br />(0.21 gpm). A recharged battery was connected to the pump system. Remaining pressure transducer <br />memory was sufficient and readings were not downloaded. Pond snow was showing some melting. <br />February 4, 2010: Preliminary data became available for the water sample collected on January 27th. <br />The data showed a TDS concentration of 14,500 mg/L, with relatively high concentrations of sodium <br />(2,470 mg/L), potassium (2,830mg/L), and sulfate (7,310 mg/L). Arsenic had a concentration of 0.049 <br />mg/L. Because of the reported high TDS value, a dilution factor of 10 was applied to the analysis and <br />the reporting limits for the metal results were elevated. No BTEX was detected in the sample with the <br />exception of toluene which was detected below the reporting limit. The concentration of TPH was 2.1 <br />mg/L; but qualified because TPH was present in the method blank. See Table 1, the preliminary <br />analytical data for the sample collected at evaporation pond detection vault. <br />TMarshaII020510 Final.doc <br />