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MONITORING AND REPORTING PROGRAM ORDER NO . R5-2015-0012-007 4 <br /> APACHE PLASTICS ( Former) <br /> 2050 EAST FREMONT STREET, STOCKTON <br /> SAN JOAQUIN COUNTY <br /> ESTABLISHMENT OF BACKGROUND CONCENTRATION VALUES <br /> 6. The Discharger established the following background values for concentrations in shallow <br /> (about 56 to 68 feet below ground surface) in Table 5A and deep (about 116-121 feet below <br /> ground surface) groundwater in Table 5B. <br /> Table 5A: Shallow Background Concentration Values <br /> Constituent Background Concentration /L <br /> Arsenic < 1 <br /> Aluminum 616 <br /> Barium 344 <br /> Bromate 21200 <br /> Bromide 31800 <br /> Chlorine 60 <br /> Copper 21 <br /> Hexavalent Chromium <0.2 <br /> Iron 384 <br /> Manganese 473 <br /> Zinc 60 <br /> Total Dissolved Solids 650 m /L <br /> Electrical Conductivity 968 umhos/cm <br /> Table 5B : Deep Back round Concentration Values <br /> Constituent Background Concentration /L <br /> Arsenic 11 <br /> Aluminum 339 <br /> Barium 265 <br /> Bromate 21600 <br /> Bromide 51500 <br /> Chlorine 40 <br /> Copper <10 <br /> Hexavalent Chromium <0.2 <br /> Iron < 10 <br /> Manganese 67 <br /> Zinc 32 <br /> Total Dissolved Solids 700 m /L <br /> Electrical Conductivity 1 , 065 umhos/cm <br />