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Stantec <br /> April 30, 2010 <br /> Page 4 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-2 <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 /> "B"Zone <br /> TPHg 18 10 8 19,000 2,717 <50 37,000 49 <br /> (AR/MW-11 B) (AR/MW-8B/2003) <br /> TPHd 18 8 10 5,800 689 155 52,000 89 <br /> (TO/WC-2B) (AR/MW-5B/2008) <br /> Benzene 18 10 8 9,700 1 298 0.7 /2 <br /> (TO/WC-2B) (AR/MW-8B-8B/2001 and 43 <br /> 2003) <br /> MTBE 18 10 8 1,300 AR/MW 8B 129 1.3 (AR/MW-8B 0/2007 75 <br /> TBA 15" 6 9 1,800(AR/MW-1 B) 251 35 (AR/MW- 081 <br /> 5B/2008) <br /> " 0.95 41 <br /> TAME 4 3 1 (AR/MW-1 B) (TS/MW-1B /2002) 98 <br /> DIPE 7" 5 2 2.6 4.1 37 <br /> (AR/MW-1 B) (AR/MW-1 B /2001) <br /> MBAS 11 9 2 AR/MW 9B 00 544 410 2,200 AR/MW-14B/2009 14 <br /> Definitions. MBAS=Methylene blue active substances " = In compliance with MRP <br /> MRL=Method Reporting Limit TBA=Tertiary butyl alcohol --=Elevated MRLs skewed calculations <br /> pg/L=Micrograms per Liter TAME=Tertiary amyl methyl ether <br /> WQO=Water Quality Objective . =Requested by the RWQCB beginning in 2009 <br /> Median=the middle number in a sequence of numbers <br /> WQOs <br /> Unless otherwise noted,WQOs from AppendixA-Reports, Tri- TPHg(21 pg/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 pg/L) TAME(no WQO provided, MRL used) <br /> RWQCB,April 16,2004. MTBE(5 pg/L) MBAS(500 pg/L,Secondary MCL) <br />