ARCHIVED REPORTS XR0008529 - Laserfiche WebLink

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• 15 May 2004 AGE-NC Project No 01-0815 ' Page 3 of 8 ' • The fuel additives di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), MTBE, tertiary-amyl methyl ether(TAME), tertiary butanol (TBA), 1,2-dtchloroethane(1,2-DCA) and 1,2-dibromoethane (EDB) by EPA Method 8260 Modified 2 15 Monitoring Well Development On 24 March 2004 monitoring wells MW-1 throe MW-3 were developed utilizing a Waterra ' inertia foot-check-pump tubing bailer Ground water was purged from each monitoring well until ground water was visually sediment free,approximately 21 gallons of water were removed from each well Purged ground water was containerized in properly labeled DOT-approved model 17H ' 55-gallon drums and was stored on-site Field sheets and data are included in Appendix C 2 1 6 Well Head Survey On 30 March 2004,a California state-licensed surveying engineer from Morrow Surveying surveyed ' • the location and elevation of monitoring wells MW-1 through MW-3, the location was surveyed to the nearest 0 1 foot relative to coordinate datum NAD 83 (1986), and the elevation at the top of the well casing was surveyed to the nearest 0 01-foot relative to Stockton benchmark#31,at an elevation ' 10 59 feet above mean sea level (MSL) The results of the monitoring well survey are contained in Table 3 The surveying report (Morrow Surveying) is presented in Appendix D 2 1 7 Equipment Decontamination and Borehole Abandonment ' All augers used were cleaned prior to advancement in each boring location The sampling equipment was washed in an Alconox solution and rinsed with water prior to each sampling run to avoid cross- contamination At the conclusion of soil boring activities, boring B1 was permanently scaled to prevent vertical migration of contaminants, under EHD oversight,the borehole was backfilled with cement slurry from the total depth to surface grade 2 2 QUARTERLY WELL MONITORING PROCEDURES IThe initial quarterly ground water monitoring event was performed on 30 March 2004,ground water monitoring was performed on monitoring wells MW-1 through MW-3 Advanced GeoEnvironmental,Inc