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Stantec <br /> L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2010 SITE STATUS, <br /> REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT <br /> Summary of 2010 Annual Monitoring and Sampling <br /> January 31, 2011 <br /> 5.7.6 TBA <br /> Concentrations of TBA was not detected at or above the MRL during 2010 in the B-Zone wells, <br /> therefore, TBA was delineated. <br /> 5.8 C-ZONE ISOCONCENTRATION TRENDS <br /> C-Zone isoconcentration trends are discussed below. Figures from the 1Q10, 2Q10, and 3Q10 <br /> are provided in Appendix I. <br /> 5.8.1 TPHg <br /> Concentrations of TPHg are generally detected on the L&M OU property and seldom on the <br /> Water Front Towers' parking lot. Based on data collected during 2010, TPHg was delineated to <br /> the north and west. During 4Q10, TPHg was detected, at very low concentrations, in wells <br /> MW-62 and MW-63. <br /> 5.8.2 TPHd <br /> Concentrations of TPHd are generally detected on the L&M OU property and on the Water Front <br /> Towers' parking lot. Based on data collected during 2010, TPHd was generally delineated, <br /> except to the east. <br /> 5.8.3 TPHo <br /> Concentrations of TPHo are sporadic and at relatively low concentrations across the C-Zone <br /> wells. Based on data collected during 2010, TPHo was delineated to the east and west during <br /> the 1Q10, 2Q10, and 3Q10. TPHo was only detected in the northern section of the Water Front <br /> Towers' parking lot, on wells MW-62 and MW-63, during 4Q10. <br /> 5.8.4 Benzene <br /> Concentrations of benzene are generally detected on the northern portion of the L&M OU <br /> property, on the Water Front Towers' parking lot, and on the southwestern section of the Delta <br /> View apartment property. Based on data collected during 2010, benzene was only delineated to <br /> the southwest, during 1Q10. During 2Q10, benzene was delineated to the north and west. <br /> Benzene was delineated, during 3Q10. During 4Q10, benzene was delineated, except to the <br /> north. During the 3Q10 and 4Q10, benzene was detected, at low concentrations, in well <br /> MW-66. <br /> 5.8.5 MtBE <br /> Concentrations of MtBE are generally detected on the northern portion of the L&M OU property, <br /> and seldom on the Delta View apartment property. Based on data collected during 2010, MtBE <br /> was delineated, except to the east. During 2Q10, MtBE was detected in well MW-66. <br /> 5.8.6 TBA <br /> Concentrations of TBA are generally detected on the northern portion of the L&M OU property, <br /> and seldom on the western portion of the Water Front Towers' parking lot. Based on data <br /> I:\Tidewater\TW Stockton(Parcel 2A-0415)\Reports\QMR\2010\4010-Annual\4Q10 and Annual OSSRQRSRQMR Stockton_FINAL.doc 5.6 <br />