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MW-10A (Newly-installed,Impacted): <br /> This is the first quarter MW-10A was monitored. Concentrations of all parameters were within <br /> established concentration limits where the limits could be determined (Table 1). One primary <br /> MCL for Nitrate as Nitrogen was slightly exceeded in MW-9A this quarter. Secondary MCL for <br /> TDS was also exceeded in MW-l0A this quarter. <br /> Three VOCs were reported this quarter, two above"trace" concentration(Table 1). <br /> All VOCs detected in this well are among the VOCs found in MW-5 and MW-8, generally at <br /> lower concentrations. It is our opinion that MW-5 is closer to the source of the VOCs and thus <br /> has more VOCs. <br /> Data is not sufficient to establish a trend in this well. <br /> MW-11A (Newly-Installed,Impacted): <br /> This is the first quarter MW-11A was monitored. Concentrations of all parameters were within <br /> established concentration limits where the limits could be determined(Table 1). No primary <br /> MCLS were exceeded in MW-11A this quarter. Secondary MCLs for EC and TDS was also <br /> exceeded in MW-11 A this quarter. <br /> Six VOCs were reported this quarter, one above"trace" concentration(Table 1). <br /> All VOCs detected in this well are among the VOCs found in MW-5 and MW-8, generally at <br /> lower concentrations. It is our opinion that MW-5 is closer to the source of the VOCs and thus <br /> has more VOCs. <br /> Data is not sufficient to establish a trend in this well. <br /> Deep Aquifer <br /> MW-6(Down gradient): <br /> Concentrations of all parameters were within established concentration limits where the limits <br /> could be determined (Table 2). No primary MCLs were exceeded this quarter in MW-6. <br /> Secondary MCLs for EC, TDS, and Sulfate were exceeded in MW-6 this quarter. However,the <br /> EC, TDS and Sulfate levels are consistent with the general historical conditions at this well. <br /> Based on output from the Sanitas statistical software, an increasing trend is reported in the <br /> concentration of Turbidity this quarter(Table 3). <br /> No VOCs were reported at this well this quarter. Other than false positives,no VOCs have been <br /> reported since Toluene was reported in 2005 when the well was first installed. These Toluene <br /> data indicate that this compound was probably introduced by the drilling company when this <br /> Corral Hollow Sanitary Landfill 13 Department of Public Works/Solid Waste <br /> 2nd Quarter 2012 Groundwater Monitoring County of San Joaquin—July 30,2012 <br />