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Stantec <br /> April 30, 2010 <br /> Page 6 of 6 <br /> Reference: First Quarter 2010 Site Status, Groundwater Monitoring and Remedial Summary Report-Stockton Terminals Technical Committee <br /> Facilities <br /> Appendix D-Analytical Program Description, Field Data Sheets, Groundwater Certified Laboratory Analytical Reports,and Chain-of- <br /> Custody Documentation <br /> Table D-4 <br /> First Quarter 2010 <br /> Number of <br /> Wells at or Number of Percent <br /> below the Wells with Maximum Decrease <br /> Number WQO Detections Concentration Average Median Maximum Detected from <br /> Detected of Wells and/or above the Detected in pg/L Concentration Concentration Historical Maximum <br /> Constituents Analyzed MRL WQO (Well ID) (Ng/L) (Ng/L) Concentration Historical <br /> Bold Concentrations below WQO or MRL (Well/Date) Concentration <br /> "D"Zone <br /> TPHg 9 5 4 11,000 2,166 <50 12,000 8 <br /> (TS/MW-2D) (OW-5D/2004) <br /> TPHd 9 2 7 1,900(TS/MW 2D) 612 340 O 60 <br /> (TS/MW-1 D/2004) <br /> Benzene 9 3 6 5,600 TS MW 2D 1,064 7.5 TS/MW-2D0/2007 3 <br /> MTBE 9 7 2 21(TS/MW-3D) 5.0 <0.50 23(TS/MW 3D/2009) 9 <br /> TBA 8^ 5 3 1,900(TS/MW 2D) 440 6.3 (TS/MW-3D/2009)200 14 <br /> ^ 0.95 1.1 <br /> DIPE 3 2 1 (OW-8D) (OW-8D/2008) 14 <br /> Definitions. <br /> MRL=Method Reporting Limit TBA=Tertiary butyl alcohol <br /> ug/L=Micrograms per Liter ^ =In compliance with MRP <br /> WQO=Water Quality Objective --=Elevated MRLs skewed calculations <br /> Median=the middle number in a sequence of numbers <br /> WQOs <br /> Unless otherwise noted,WQOs from AppendixA-Reports, Tri- TPHg(21 Ng/L) DIPE(0.80 pg/L) <br /> Regional Board Staff Recommendations for Preliminary TPHd(100 pg/L) TBA(12 pg/L) <br /> Investigation and Evaluation of Underground Tank Sites, Benzene(1 Ng/L) <br /> RWQCB,April 16,2004. MTBE(5 Ng/L) <br />