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• Second Semiannual and 2018 Annual Groundwater Monitoring Report JACOBS® <br /> Study(CH2M, 2007a). The steady reduction in hydrocarbon mass is shown in the time series <br /> concentration charts in Appendix D and Appendix E. <br /> 3.3 Identification of Data Gaps and Potential Deficiencies/ Redundancies <br /> • No data gaps or deficiencies have been identified. Routine groundwater monitoring at the site was <br /> implemented in March 1992. To date, the groundwater monitoring program has been performed for <br /> approximately 24 years and has provided important time series information with respect to groundwater <br /> i elevations and gradients, NAPH thicknesses, and chemical concentrations in groundwater and surface <br /> water. <br /> • Seasonal patterns in groundwater elevation fluctuations, as well as seasonal and long-term trends in TPH <br /> and BTEX concentrations, have been identified, as documented in the Final Site Characterization Report <br /> (CH2M, 2002) and in subsequent routine groundwater monitoring reports. Robust data have been <br /> collected to demonstrate that the naturally occurring processes are sufficient to result in a continued <br /> declining trend of these hydrocarbon constituents without the active remediation systems, as documented <br /> in the 3-Year Evaluation of the Bioremediation Pilot Study(CH2M, 2007x). <br /> Current MRP No. R5-2018-0806 was developed to monitor current site conditions with MNA and <br /> • phytoremediation as remedies. This current MRP requires semiannual and annual monitoring; however, <br /> the number and frequency of wells to be sampled has been reduced from what was required in previous <br /> MRP No. R5-2007-0831. This new MRP will continue to provide data to monitor concentrations within the <br /> • plume and along the plume boundaries. <br /> • <br /> • <br /> • <br /> i <br /> • <br /> i <br /> • <br /> A <br /> • <br /> • <br /> • <br /> • <br /> • <br /> i <br /> • AX1015181035SCO 3-3 <br /> • <br />