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C*1Ogux17echdaIru. Page 4 <br /> Dual Phase Extraction Pilot Test Report <br /> Project No 662 2 <br /> February 22,2005 <br /> ' 2.3 Soil Laboratory Analysis <br /> ' The capillary fringe samples from the two borings were submitted to Sequoia Analytical of <br /> Sacramento, California(State Certified Laboratory#1624) for the following analyses <br /> • Benzene, Toluene,Ethylbenzene and Xylene (BTEX) by EPA method 8260 <br /> ' * Gasoline range petroleum hydrocarbons (TPH-G)by EPA method 8260 <br /> a MTEB, ETBE, D1PE, TAME &TBA by EPA method 8260 <br /> ' a Ethanol, 1,2 DCA, EBD by EPA method 8260 <br /> • Methanol by EPA method 8015B modified <br /> Diesel by EPA method 8015B <br /> ' + Lead by EPA Method 6010B <br /> The detection limits for these compounds are listed in Table 1 of Appendix A A Chain of <br /> Custody was completed for all samples collecEed and tracked to ensure sample integrity <br /> As required under- AB2886, GTI submitted the laboratory data in accordance with <br /> ' GeoTracker requirements on February 14, 2005 (confirmation#1412647592) <br /> 2.4 Monitoring Well Installation <br /> The monitoring wells were constructed using 2-inch diameter PVC casing with flush threads <br /> The following table illustrates the construction details <br /> ' Well Diameter Screened Filter Pack Bentonite Cement <br /> Interval (ft) #3 Annular Grout <br /> (ft) Seal (ft) (ft) <br /> MW-5 2" 40 - 45' 38—45' 355 - 38 0—35 5' <br /> MW-6 2" 40 - 45' 38--45' 36 - 38 0— 36' <br /> A transition seal of weighted bentonite pellets was installed above the sand (#2112) filter pack <br /> and allowed to set for thirty minutes The surface seal was achieved by pumping a neat <br /> cement grout (augmented with <5% bentonite) into the borehole through a PVC tremmie <br /> pipe The wells were secured with a locking watertight cap encased in a flush mounted <br /> ' traffic rated well box The surface was finished with a concrete patch to match the existing <br /> sidewalk in accordance with City of Manteca requirements <br /> The well construction details are shown in Appendix A, Table 2 and on the boring logs <br /> included in Appendix B <br /> ' 2.5 Well Development <br /> GTI staff mobilized to the site on November 8, 2004 to develop the new wells MW-5 & <br /> MW-6 The wells were developed by surging and pumping with a dedicated Waterra pump <br />