Laserfiche WebLink
However,the Nitrate,EC, and TDS levels are consistent with the general historical conditions at <br /> this well. <br /> Ten VOCs were reported in impacted well MW-5: four above"trace" concentrations and one <br /> (Tetrachloroethene) above their MCLs (Table 1). These data are consistent with previous <br /> monitoring results. <br /> Trend analysis of VOC concentrations indicates increasing trends for 1,1-Dichloroethane, Cis- <br /> 1,2-Dichloroethene and Tetrachloroethene, and a decreasing trend for Dichlorodifluoromethane, <br /> 1,2-Dichloropropane, Trichloroethene, and Vinyl Chloride. Trend analysis will continue to be <br /> used quarterly to evaluate concentrations of VOCs in MW-5. <br /> MW-8(Impacted): <br /> Concentrations of all parameters were within established concentration limits where the limits <br /> could be determined(Table 1). Based on output from the Sanitas statistical software, an <br /> increasing trend is reported in Bicarbonate Alkalinity, whereas a decreasing trend is reported in <br /> the concentration of Chloride (Table 3). No primary MCLs were exceeded in MW-8 this <br /> quarter. No secondary MCLs were exceeded in MW-8 this quarter. These data are consistent <br /> with previous monitoring results. <br /> Seven VOCs were reported this quarter, four above "trace" concentration and no VOCs were <br /> reported above their MCLs (Table 1). <br /> All VOCs detected in this well are among the VOCs found in W-5, generally at lower <br /> concentrations. It is our opinion that MW-5 is closer to the source of the VOCs and thus has <br /> more VOCs. <br /> Trend analysis of VOC concentrations indicates increasing trends for 1,1-Dichloroethane, Cis- <br /> 1,2-Dichloroethene, Tetrachloroethene and Trichloroethene. Trend analysis of VOC <br /> concentrations also indicates a decreasing trend in Methylene Chloride this quarter. Trend <br /> analysis will continue to be used quarterly to evaluate concentrations of VOCs in MW-8. <br /> MW-9A (Newly-installed,Impacted): <br /> This is the first quarter MW-9A 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-9A this quarter. <br /> Two VOCs were reported this quarter at trace concentrations (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 /> Corral Hollow Sanitary Landfill 12 Department of Public Works/Solid Waste <br /> 2nd Quarter 2012 Groundwater Monitoring County of San Joaquin—July 30,2012 <br />