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' Gealogiral reckairs me Page 2 <br /> Groundwater Monitoring Report <br /> Project No 425 2 <br /> May 10,2005 <br /> ' A summary of groundwater analytical findings include <br /> • TPH-G and BTEX concentrations in MW-1 show significant decrease in comparison <br /> ' with the previous monitoring events <br /> • MW-5 does not show significant change in contaminant concentrations in comparison <br /> with the last quarterly monitoring event <br /> • The concentration of TPH-G in MW-2 increased in comparison with the <br /> concentrations detected during the last six monitoring events 1,2 DCE has also been <br /> detected during this monitoring event in MW-2 <br /> ' • MW-4 also shows TPH-g contamination <br /> • MW-7 has been detected only for 1,2 DCE <br /> • MW-106 has been detected for MTBE and 1,2 DCE <br /> • Samples were collected from three domestic wells during the April 2005 monitoring <br /> event The domestic wells were non-detect above laboratory reporting limits <br /> suggesting contamination has not nugrated to the monitored domestic wells <br /> 1.0 GROUNDWATER MONITORING <br /> 1.1. Hydrology of Site <br /> 1.1.1 Zone Divisions <br /> To define the site more accurately, the aquifer is divided into four zones (Zones A through D) <br /> defined by the screen intervals of the sixteen monitoring wells associated with the site Zone <br /> divisions and well construction are summarized in Table 1 <br /> ' o Zone A includes monitoring wells screened between 5 and 22-feet bgs <br /> • Zone B includes monitoring wells screened between 32 and 35-feet bgs <br /> • Zone C includes monitoring wells screened between 45 to 49 5-feet bgs <br /> ' • Zone D is represented by MW-202 screened between 79 and 81 5-feet bgs <br /> 1.1.2 Horizontal Groundwater Gradients <br /> ' Zone A <br /> The average groundwater elevation is 73 18 feet above mean sea level (AMSL) This <br /> represents an increase of 0 1 feet since the January 2005 monitoring event The zone-specific <br /> groundwater gradient was 0 0009 ft/ft flowing N24°E A review of the groundwater gradients <br /> in Zone A show groundwater bearings varying from north to northeast with the slope ranging <br /> ' from 0 0001 to 0 0044 ft/ft <br /> Table 2 of Appendix A summarizes Zone A groundwater elevations, gradients and bearings <br /> Figure 3 illustrates the April 11, 2005 groundwater gradient for Zone A <br />