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GeologcraCTechnics Inc Page 2 <br />' Groundwater Monitoring Report <br /> Project No 425 2 <br /> • May 20, 2002 <br /> • Interestingly, MW-I has shown increased concentrations of TPH-G and BTEX since <br /> September 1999 However, the concentrations are fairly low <br />' • All of the deep-screened wells (MW-102, MW-105 MW-107 and MW-202) were <br /> non-detect for the event This is the sixth consecutive event that this condition has <br /> been documented <br /> • The domestic wells associated with the site were non-detect for all constituents <br /> ' 1.0 GROUNDWATER MONITORING <br /> ' 1.1 Hydrology of Site <br /> 1.1.1 Horizontal Groundwater Gradients <br /> On December 21 2001, Thomp son-Hysell Engineers of Modesto, California surveyed the <br /> wells in accordance the SWRCB Geotracker requirements of AB2886 The average water <br /> ' table elevation at the site on February 22, 2002, was 73 81 feet above mean sea level This <br /> represents a decrease of 0 14 feet since the wells were resurveyed on December 21, 2001 <br /> The water table groundwater gradient was 0 0011 ft/ft flowing N61°E This is the farthest <br /> east the groundwater has trended since the investigation began <br /> 1 The average groundwater elevation in the intermediate depth wells (MW-102, MW-105 & <br /> MW-107) for the monitoring event was 73 68 feet above mean sea level and the <br /> intermediate depth groundwater gradient was 0 0016 ft/ft flowing N87°E <br /> A review of the groundwater gradients shows that the predominant groundwater flow varies <br /> from north to northeast with the slope ranging from 0 0011 up to 0 0044 ft/ft in the water <br /> ' table wells Table I of Appendix A summarizes the water table groundwater gradients and <br /> levels to date, and Figure 2A illustrates the February 22, 2002, groundwater direction and <br /> gradient The predominant groundwater flow is to the east-northeast wtth the slope rarlgmg <br /> ' from 0 0016 to 0 027 ft/ft in the intermediate wells Table 2 of Appendix A summarizes the <br /> intennediate groundwater gradients and levels to date, and Figure 2B illustrates the <br /> February 22, 2002, groundwater direction and gradient in the intermediate wells <br /> Table 2 also summarizes the groundwater level data from the deep well, MW-202 <br /> rThe historical water table and intermediate groundwater gradients are included in Figures <br /> 3A & 3B- Shallow and Intermediate Rose Diagrams <br /> 1 <br />