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Mr. Geoffrey Rader <br /> Page 6 of 7 <br /> on a trend of decrease. Although this is not a leaking underground storage tank contamination <br /> case, we believe that the criteria in the SWRCB Low Threat Underground Storage Tank Case <br /> Closure Policy (LTCP) are relevant and appropriate and that this case may meet the criteria for <br /> closure. We recommend preparation of a Low Threat Case Closure Evaluation Report. <br /> If you have any questions or comments concerning this report, please contact Ground Zero at your <br /> convenience. <br /> Respectfully, <br /> Ground ero Analysi , Inc. <br /> Joseph L. Vasquez, Sv3NAL G <br /> Staff Geologist QHS Fp�oc <br /> a GREGORY P. N1 <br /> STML <br /> Grego y a 1, PG 5023 N0 5023 <br /> (P <br /> CA Certified Hydrogeologist 264 <br /> F OF CAUF�Q <br /> Figures: <br /> 1: Site Location Map <br /> 2: Site Plan <br /> 3: Groundwater Gradient Map (December 2018) <br /> 4: Groundwater Gradient Map (March 2019) <br /> 5: TPHg Isoconcentration Map (March 2019) <br /> 6: TPHd Isoconcentration Map (March 2019) <br /> 7: Benzene Isoconcentration Map (March 2019) <br /> 8: MTBE Isoconcentration Map (March 2019) <br /> Tables: <br /> 1: Monitoring Well Construction Details <br /> 2: March 2019 Groundwater Monitoring and Analytical Data <br /> 3: Cumulative Groundwater Elevation Monitoring Data <br /> 4: Free Product Removal from Monitoring Well MW6R <br /> 5: Free Product Removal from Monitoring Well MW8 <br /> 6: Free Product Removal from Monitoring Well MW9/MW9R <br /> 7: Free Product Removal from Vapor Extraction Well VEW 1-D <br /> 8: SVE System Monitoring & Mass Removal Data <br /> 9: Soil Vapor Analytical Results <br /> 10: Cumulative Groundwater Analytical Results <br /> 11: Cumulative Groundwater Analytical Results—Oxygenates <br />