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Monitoring Parameter Concentration Limits <br /> Interwell concentration limits were established from background monitoring well G-1. No <br /> concentration limits were exceeded this semester in any wells, with the exception of well G-1 where a <br /> slight exceedence for Sodium was reported. However, since there is an indication of possible changes in <br /> the background water quality, it is possible that higher levels of constituents may begin to be reported in <br /> the downgradient wells at the site. A careful review of the future monitoring results will be undertaken <br /> to try to segregate the influence to increasing background conditions from influences from the landfill. <br /> VOCs <br /> VOCs were not reported in any wells during this semester. <br /> With the exception of recently-installed G-1, all wells have been free of VOCs since January 2003. At <br /> G-1, Acetone, Chloroform, and Toluene were occasionally observed when the well was first installed in <br /> 2010 and reported during the 2nd Semester 2010, but have not been reported since that time. This <br /> confirms our conclusion that these detections were due to slight contamination of that well during <br /> construction. We expect that this well will remain"non-detect status" in the future. <br /> With the exception of the detections at G-1, VOCs have not been confirmed at the North County <br /> Sanitary Landfill since January 2003, over ten years ago. <br /> Storm Water <br /> Storm water was sampled from discharge point SW-4 at the north west corner of the Unit in April 2013 <br /> (Appendix Q. Results were unremarkable. <br /> Surface Water <br /> Surface water was not available for sampling this semester. Surface water samples were last collected <br /> January 31, 2011. Samples are taken if sufficient water is flowing at sampling points during the wet <br /> season. <br /> Unsaturated Zone (Lysimeters) <br /> During the second semester, the Lysimeters did not yield enough water for sampling, indicating no <br /> detectable leaks from the liner in those areas. Unsaturated zone monitoring will continue in accordance <br /> with the WDRs. <br /> Soil Gas <br /> Soil gas samples were collected on January 30, 2013. Methane was detected in SG-6. <br /> VOCs were detected in one soil gas sample that was collected. VOCs were found in SG-6 (Table 5 and <br /> Appendix H). Continued lack of groundwater impact indicates that the presence of VOCs in the soil <br /> does not threaten groundwater quality. <br /> North County RC&SL Public Works/Solid Waste <br /> 1n Semester 2013 Groundwater Monitoring 7 County of San Joaquin—July 25,2013 <br />