ARCHIVED REPORTS_THIRD QUARTER 2011 SITE STATUS, REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT

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Stantec L & M OPERABLE UNIT- THIRD QUARTER 2011 SITE STATUS, REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT Groundwater Monitoring and Sampling October 28, 2011 Number of Number of Minimum Detected Maximum Detected C-Zone Constituents Detections Wells Concentration in mg/L Concentration in mg/L above the MRL Analyzed (Well ID) (Well ID) TPI-Ig 4 8 0.12 (MW-65) 1.9 (MW-64) TPHd 6 8 0.075 (MW-67) 2.1 (MW-54) TPHo 4 8 0.066 (MW-65) 0.54 (MW-62) Benzene 4 8 0.00097 (MW-64) 0.0022 (MW-66) Toluene 3 8 0.00060 (MW-64) 0.00069 (MW-66) Ethylbenzene 1 8 --- 0.0012 (MW-64) Total Xylenes 3 8 0.00150 (MW-66) 0.00342 (MW-54) MtBE 3 8 0.00053 (MW-63) 0.014 (MW-64) TBA 2 8 0.013 (MW-64) 0.059 (MW-54) Definitions: ID = Identification mg/L = Milligrams per liter MRL = Method reporting limit MtBE= Methyl tertiary butyl ether TBA = Tertiary butyl alcohol TPI-Id = Total petroleum hydrocarbons as diesel TPI-Ig = Total petroleum hydrocarbons as gasoline TPHo = Total petroleum hydrocarbons as motor oil --- = Not applicable 2.5.2.3 Volatile Organic Compounds VOCs with concentrations at or above the MRLs are summarized below. Number of Number Minimum Detected Maximum Detections of C-Zone Concentration in Detected Constituents above the Wells mg/L (Well ID) Concentration in MRL Analyzed mg/L (Well ID) n-butyl benzene 3 8 0.00092 (MW-66) 0.017 (MW-64) tert-butyl benzene 2 8 0.00054 (MW-65) 0.00058 (MW-67) sec-butyl benzene 3 8 0.00074 (MW-66) 0.011 (MW-64) Isopropyl benzene 3 8 0.0031 (MW-66) 0.059 (MW-64) n-propyl benzene 3 8 0.0071 (MW-66) 0.16 (MW-64) Definitions: ID = Identification mg/L = Milligrams per liter MRL = Method reporting limit I:\Tidewater\TW Stockton(P2A)\QMRs\2011\3Q11\3Q11 QSSR QRSR QMR Stockton_FINAL.doc 2.13