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MW-9A (7Vewly-installed): <br /> This is the second quarter MW-9A was monitored. Concentrations of all parameters were within <br /> established concentration limits where the limits could be determined (Table 1). <br /> No VOCs were reported in MW-9A this quarter(Table 1). <br /> Data is not sufficient to establish a trend in this well. <br /> MW-10A (Newly-installed,Impacted): <br /> This is the second quarter MW-10A was monitored. Concentrations of all parameters were <br /> within established concentration limits where the limits could be determined(Table 1). <br /> Two 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 /> MW-IIA (Newly-installed,Impacted): <br /> ARIL <br /> This is the second quarter MWA 1A was monitored. Concentrations of all parameters were <br /> within established concentration limits where the limits could be determined(Table 1). <br /> Three 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. The higher concentration of VOCs at MW-5 indicates that it is closer to <br /> the source of VOCs. <br /> Data is not sufficient to establish a trend in this well. <br /> A PCE concentration contour map, including the extent of the plume ("zero' line), was <br /> developed to help describe the extent of VOC migration from the landfill in the shallow aquifer <br /> that is created by Corcoran Clay Formation(Figure 5). The zero PCE concentration line is based <br /> on the following: <br /> • No PCE detected at MW-9A <br /> • The PCE concentration detected at MW-11 A (0.18 ug/L) is slightly above the laboratory <br /> method detection limit of 0.13 ug/L <br /> • A linear extrapolation of the 1 ug/L contour interval lines between a PCE concentration <br /> of 4.2 ug/L at MW-5 and a PCE concentration of 0.49 ug/L at MW-l0A <br /> • <br /> Corral Hollow Sanitary Landfill 12 Department of Public Works/Solid Waste <br /> 3'd Quarter 2012 Groundwater Monitoring County of San Joaquin—October 30,2012 <br />