Laserfiche WebLink
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 /> collected during 2010, TBA was delineated, except to the east. During the 3Q10 and 4Q10, <br /> TBA was detected, just slightly above MRL, in well MW-63. <br /> 5.9 D-ZONE ISOCONCENTRATION TRENDS <br /> Deep D-Zone isoconcentration trends are discussed below. Figures from the 1Q10, 2Q10, and <br /> 3Q10 are provided in Appendix I. <br /> 5.9.1 TPHg <br /> Concentrations of TPHg are generally detected on the L&M OU property and on the northern <br /> portion of the Water Front Towers' parking lot. Based on data collected during 2010, TPHg was <br /> delineated to the south, west, and northwest only. <br /> 5.9.2 TPHd <br /> Concentrations of TPHD are generally detected on the L&M OU property, the Water Front <br /> Towers' parking lot, and seldom on the southwestern section of the Delta View apartment <br /> property. Based on data collected during 2010, TPHd was delineated during the 1Q10. During <br /> 2Q10, TPHd was delineated, except to the east. During 3Q10, TPHd was delineated, except to <br /> the north. During 4Q10, TPHd was delineated to the southwest only. <br /> 5.9.3 TPHo <br /> Concentrations of TPHo are sporadic and at relatively low concentrations across the D-Zone <br /> wells. Based on data collected during 2010, TPHo was delineated only to the southeast, during <br /> 1Q10. During 2Q10, TPHo was delineated only to the west. During the 31010, TPHo was <br /> delineated to the north and west. During 4Q10, TPHo was only detected, slightly above MRL, in <br /> wells MW-68 and MW-69. <br /> 5.9.4 Benzene <br /> Concentrations of benzene are detected on the northern portion of the L&M OU property and on <br /> the Water Front Towers' parking lot. Based on data collected during 2010, benzene was <br /> delineated to the west and south. During 1Q10, benzene was detected, slightly above MRL, in <br /> well MW-68. <br /> 5.9.5 MtBE <br /> Concentrations of MtBE are detected on the northern portion of the L&M OU property, mainly in <br /> well MW-55. Based on data collected during 2010, MtBE is delineated. <br /> 5.9.6 TBA <br /> Concentrations of TBA are detected the L&M OU property and on the Water Front Towers' <br /> parking lot. Based on data collected during 2010, TBA is delineated, except to the east. During <br /> 2Q10 and 3Q10, TBA was detected, slightly above MRL, in well MW-70. <br /> Iffidewater7W Stockton(Parcel 2A-0415)\Reports\QMR\2010\4010-Annual\4Q10 and Annual QSSRQRSRQMR Stockton_FINAL.doc 5.7 <br />