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• • • • • • SECTION 5.0 • Results • • • The historical results of groundwater monitoring at the Koppel Stockton Terminal are • presented in Table B-1 in Appendix B.The laboratory reports for the analyses performed • during 2011 are presented in Appendix D. • 5.1 Annual Groundwater Monitoring 5.1.1 Video Survey of Monitoring Well KP-3 • Monitoring well KP-3 was video surveyed during the annual groundwater monitoring event performed in August 2011. The video is included on a compact disk in Appendix F. • The video survey did not indicate any evidence of mineral precipitation in the well or roots • entering the well. • 5.1.2 Groundwater Levels • The groundwater data collected from the monitoring wells and piezometers at the Koppel • Stockton Terminal are summarized in Appendix B,Table B-1. Groundwater elevations • measured at site monitoring wells and piezometers since third quarter 1998 are presented on Figure 5-1.Water levels have fluctuated as much as 10 feet in individual wells over the • monitoring period (July 1996 to August 2011).These fluctuations are considered seasonal • because water levels are consistently lower in the third quarter of the year than the first or second quarter. • Groundwater elevations for the 2011 semiannual monitoring event were collected on • March 4,2011,and ranged from 1.22 to-4.07 feet msl.Groundwater elevations for the 2011 • annual monitoring event were collected on August 9,2011,and ranged from-1.7 to-5.55 feet • msl.Figure 5-2 presents the shallow groundwater contours for March 2011 and Figure 5-3 presents the shallow groundwater contours for August 2011. • Table 5-1 presents the approximate magnitudes and directions of lateral and vertical • hydraulic gradients at the site from first quarter 2000 through third quarter 2011.Lateral • hydraulic gradients observed in March 2011 were approximately 0.0003 to 0.007 foot per • foot(ft/ft)toward the south-southeast.Lateral hydraulic gradients observed in August 2011 were approximately 0.001 to 0.003 ft/ft toward the south-southeast.The lateral hydraulic • gradients calculated for March and August 2011 are generally consistent with past • observations of the shallow lateral gradients at the site. • March 2011 groundwater elevations in shallow/deep monitoring well pair KP-7S/KP-7D • indicate a downward vertical gradient of 0.055 ft/ft and groundwater elevations in shallow/deep monitoring well pair TG-3/KP-6D indicate an upward vertical gradient • of 0.003. August 2011 groundwater elevations in shallow/deep monitoring well • pair KP-4/KP-4D indicate an upward vertical gradient of 0.027 ft/ft and groundwater • elevations in shallow/deep monitoring well pair TG-3/KP-6D indicate an upward vertical gradient of 0.021 ft/ft. • • RDD11123700DI(CAR5003.DOU) 5-1 Esoers11a 80D • • •