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' W IN ZLER�KELLY <br /> C 0 N 5 U L T I N G E N C I N E E R 5 <br /> r <br /> Mr James Ueda <br /> May 26, 2004 <br /> Page 2 <br /> Number of Borings: One boring was drilled and converted to groundwater monitoring well <br /> MW-4 <br /> ' Drilling Method- Monitoring well MW-4 was installed using a limited access hollow-stem <br /> auger drill ng equipped with 8-inch hollow stern augers A detailed <br /> summary of the monitoring well installation procedures is provided in the <br /> ' Site-Specific Monitoring Well Installation Procedures (Appendix B) <br /> Well Depth. 35 feet below ground surface(bgs) <br /> Soil Sampling. Soil samples were collected from boring MW-4 at 5 foot intervals beginning <br /> at 4 5 feet bgs and continuing to 36 0 feet bgs A detailed summary of the <br /> soil sampling procedures is provided in the Site-Specific Monitoring Well <br /> Installation Procedures (Appendix B) <br /> Soil Chemical Analytical Sciences Laboratory(Analytical Sciences) of Petaluma, <br /> Analysts: California(a California-certified laboratory)analyzed the soil samples <br /> collected at 25 5, 30 5, and 36 0 feet bgs for total petroleum hydrocarbons as <br /> gasoline (TPH-G) by EPA Method 8015M, and for volatile hydrocarbons by <br /> EPA Method 8260B <br /> Well Materials• Monitoring well MW-4 was constructed using 2-inch diameter PVC casing, <br /> with 0 010 slots and a 2112 sand pack The well seals were grouted with a <br /> ' <br /> cement/bentonite mixture above the sand pack to the ground surface The <br /> wellhead is protected by an 8-inch diameter flush-to-grade steel traffic-rated <br /> well box <br /> ' Screened Interval: 30 to 35 feet bgs <br /> Monitoring Well Monitoring well MW-4 was developed by over-pumping The screws that <br /> ' <br /> Development- were used to install the upper 5 feet of blank casing caused an obstruction to <br /> the flush-fitting surge block, and thus the manual surge-block development <br /> system, outlined in the January 27, 2004 Workplan, could not be employed <br /> ' Groundwater A groundwater monitoring and sampling event was conducted on April 7, <br /> Monitoring and 2004 A detailed summary of the groundwater monitoring and sampling <br /> Sampling: activities is provided in the Site-Specific Groundwater Sampling Procedures <br /> (Appendix B) <br /> Groundwater Analytical Sciences analyzed the groundwater samples collected from each <br /> Chemical Analysts. monitoring well for TPH-G by EPA Method 8015M and for benzene, <br /> toluene, ethyl benzene, and total xylenes (BTEX) and oxygenated fuel <br /> additives by EPA Method 8260B <br /> I' <br />