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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2010-0016 -7- <br />SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS <br />NORTH COUNTY LANDFILL <br />SAN JOAQUIN COUNTY <br /> <br /> <br />VOCs, µg/L <br />Carbon Disulfide <.5 5.1 <br />1,2-Dichloroethane <.5 3.9 <br />Trichlorofluoromethane <.5 1.5 <br />1,1,1-Trichloroethane <.5 1.9 <br />Trichloroethene <.5 0.6 <br />Tetrachloroethene <.5 1.1 <br />_____________________________ <br />1. Similar constituents and elevated concentrations also detected in VZs-2 and 4. <br /> <br />Neither the background nor any of the detection lysimeters have produced a <br />sufficient amount of liquid for sampling since 2003. VZ-3 has been dry since April <br />2000. Provision G.8.b requires that Discharger investigate all lysimeters at the site <br />and submit a status report as to their condition, including plans for repair or <br />replacement, as necessary. <br /> <br />31. The quality of liquid detected in the leachate collection sumps of the landfill <br />modules during the First Half 2008 was as follows: <br /> <br />Leachate Monitoring Results, First Half 2008 <br />Constituent Concentration <br /> Module 1 Module 3 Module 4 <br />General Minerals, mg/L <br />Chloride 590 500 260 <br />Bicarbonate Alkalinity 790 730 1,100 <br />TDS 2,400 2,100 1,600 <br />VOCs, µg/L1 <br />Acetone 31 14 20 <br />Benzene 0.68 < 0.4 8.8 <br />1,1-Dichloroethane 1.1 0.91 2.9 <br />1,2-Dichloroethane 1.4 1.6 4.3 <br />1,4-Dichlorobenzene 3.4 3.0 2.4 <br />Cis-1,2-DCE 1.6 0.78 2.9 <br />MTBE 8 11 50 <br />Tert-Butyl Alcohol 220 150 110 <br />Vinyl Chloride 3.0 2.9 19 <br />_____________________________ <br />1. Listing includes most, but not all, VOCs detected in the module sumps during the monitoring <br />period. <br /> <br />MRP Section D requires that the discharger monitor leachate semiannually for <br />the above leachate monitoring parameters. <br />