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23 Groundwater Monitoring, Sampling and Analysis <br /> ' On December 19, 2002, Ramage Environmental monitored and sampled the three existing <br /> monitoring wells at the site Depth-to-groundwater was monitored using a water level indicator <br /> ' capable of measurements to within 0 01 foot Following groundwater level measurements, the <br /> wells were purged and sampled <br /> The monitoring wells were purged with a pump and dedicated disposable tubing until at least three <br /> well casing volumes had been removed and/or after groundwater temperature, pH and electrical <br /> ' conductivity values had stabilized Groundwater was sampled from the monitoring wells using <br /> dedicated and disposable polyethylene bailers and laboratory-supplied containers All sample <br /> ' containers were transported in an iced cooler with chain-of-custody documentation to Excelchem <br /> Excelchem analyzed the three groundwater samples for TPH-as-diesel and TPH-as-gasoline by <br /> EPA Method 8015M, and for BTEX, MTBE, DIPE, ETBE, TAME, TBA, and 1,2-DCA by EPA <br /> ' Method 8260B <br /> 24 Waste Storage and Disposal <br /> All waste soil generated during drilling was added to four 55-gallon drums of soil remaining from the <br /> previous investigations On December 6, 2002, Ramage Environmental collected a soil sample <br /> from each of the four drums, and submitted the samples with chain-of-custody to Excelchem <br /> ' Excelchem combined the four samples into one, and analyzed the composite sample for TPH-as- <br /> diesel, TPH-as-gasoline and BTEX by EPA Method 8020/8015M, and for total lead by EPA Method <br /> 6010B The analytical results indicate that the waste can be profiled as non-hazardous waste for <br /> ' disposal ata local Class II landfill The laboratory report is included in Appendix D Currently, the <br /> disposal of the waste soil is pending landfill approval and trucking contractor scheduling These <br /> ' drums of soil remain on-site, pending waste characterization and proper disposition The disposal <br /> of the waste soil will be documented in a future correspondence <br /> Equipment rinse water and purged groundwater accumulated during recent quarterly monitoring <br /> and sampling were contained in three, 55-gallon drums and temporarily stored on-site On <br /> November 22, 2002, Ramos Environmental Services, removed approximately 75 gallons of <br /> ' wastewater from the drums using a vacuum truck, and transported the wastewater as non-RCRA <br /> hazardous waste liquid (oily water) to its recycling facility in West Sacramento, California A copy of <br /> the waste manifest is included as Appendix B <br /> i <br /> 1 <br /> • 11 <br />