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KLE/NFELOER <br /> Bli mW oen.nrgm snrueom. <br /> • During the second quarter sampling event, groundwater was found to be present at <br /> depths of 9.30 and 13.29 feet from the top of the casings in monitoring wells MW-2 and <br /> MW-5, respectively. <br /> During the second quarter, Nitrate as N was detected in the groundwater samples <br /> collected from MW-2 (an upslope well located in the southeast corner of the nursery) <br /> and MW-5 (a downslope well located in the northwest corner of the nursery) at <br /> concentrations of 30 and 23 mg/I, respectively. Nitrate as N was also detected in each <br /> of the samples collected from the dewatering discharge during the quarter with an <br /> average concentration of 24 mg/I. <br /> For additional information regarding the results of chemical analysis, please refer to the <br /> laboratory data sheets in Appendix C. <br /> The concentrations of nitrate as N in the shallow groundwater monitoring wells (MW-5 <br /> and MW-2) and the dewatering discharge samples exceeded the California Maximum <br /> Contaminant Level (MCL) of 10 mg/1 in drinking water as expressed in Section 64431 of <br /> • Title 22 of the California Code of Regulations §64431 22CCR. The nitrate as N <br /> concentrations were also exceeded in in 5 of the 13 first quarter samples and each of <br /> the 13 second quarter samples collected during the second quarter. <br /> For a summary of the results previously obtained, please refer to Table 8 under the <br /> "Tables" tab of this report. A comparison of the concentrations of the water samples <br /> obtained from the monitoring wells is shown in Chart 8, also under the "Tables" tab of <br /> this report. <br /> Past data show that the nitrate concentrations in much of the shallow perched <br /> monitoring well samples were in excess of the State of California Maximum <br /> Contaminant Level [MCL] for nitrate-nitrogen. <br /> Based on Kleinfelder's "Report Submittal, Additional Subsurface Investigation, <br /> Norman's Nursery," dated December 31, 1998, it appears that the shallow perched <br /> water is not continuous between MW-2 and MW-5. Therefore, it is not technically <br /> appropriate to conclude that the nursery has raised the concentration in the perched <br /> • aquifer as it passed beneath the nursery. Rather, due to the apparently low-permeability <br /> 117226.E02/ST01 2RO696 Page 23 of 43 September 14, 2012 <br /> Copyright 2012 Kleinfelder <br />