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Table 1 - Continued <br /> Second Quarter 2012 Groundwater Monitoring Results — Shallow Aquifer <br /> Corral Hollow Sanitary Landfill <br /> (Units mg/1 unless noted) <br /> Monitoring Point MW-9A MW-l0A MW-11A <br /> Monitoring Date Date Conc. Date Conc. Date Conc. MCLs <br /> 5/21/12 Limit 5/21/12 Limit 5/21/12 Limit MG/L <br /> Volatile Organic Cornipounds *8260B NOD- <br /> Benzene ND detect ND detect 0.19* detect 0.001 <br /> Cis-1,2-Dichloroethene ND detect ND detect 0.66 detect NL <br /> Dichlorodifluoromethane 0.12* detect 0.89 detect 0.23* detect NL <br /> 1,2-Dichloro ro ane ND detect ND detect 0.22* detect NL <br /> Tetrachloroethene(PCE) ND detect 0.50 detect 0.20* detect 5 <br /> Trichloroethene(TCE) ND detect ND detect 0.12* detect 5 <br /> Trichlorofluoromethane 0.38* detect 0.16* detect ND detect 150 <br /> All Other Compounds ND detect ND detect ND detect NR <br /> Metals <br /> Aluminum ND I ND I ND I 1 <br /> Antimony ND I ND I ND I 0.006 <br /> Arsenic 5.2 I 3.8 I 2.2* I 0.05 <br /> Hexavalent Chromium 30 1 7.5 1 0.23 1 0.050 <br /> Barium 27 I 32 I 27 1 1 <br /> Beryllium ND I ND I ND I 0.004 <br /> Cadmium ND I ND I ND I 0.010 <br /> Chromium 30 I 7.6* I ND I 0.05 <br /> Cobalt ND I ND I ND I NL <br /> Copper ND I ND I ND I 1 <br /> Iron ND I ND I ND I 0.3 <br /> Lead ND I ND I ND 1 0.05 <br /> Manganese 1.7 I 0.69* I 17 I 0.05 <br /> Mercury 0.035* I ND I 0.052* 1 0.002 <br /> Nickel 0.98* I 0.88* 1 2.2* I 0.1 <br /> Selenium 3.5 I 3.0 I 1.0* 1 0.01 <br /> Silver ND I ND I ND I 0.1 <br /> Tin ND I ND I ND I NL <br /> Thallium ND I ND I ND I 0.002 <br /> Vanadium 4.5* 1 3.8* I 3.4* I NL <br /> Zinc ND I ND I ND I 5 <br /> NR=Not Required ND=Not Detected <br /> NE=Not established,due to>50%non-detects NT=Not Tested <br /> MCL=Maximum Contaminant Levels NL=Not Listed <br /> NS=Not statistically significant decr=significantly decreasing trend <br /> I=Insufficient data for statistical analysis incr=significantly increasing trend <br /> Underlined values indicate a concentration limit exceedance. Bold values indicate a detected organic compound. <br /> [1] Not established due to statistically significant increasing trend. Concentration limit from WDRs. <br /> *Trace Concentration(estimated value) <br /> {}=Parameter also detected in one or more quality control blanks <br /> Corral Hollow Sanitary Landfill 20 Department of Public Works/Solid Waste <br /> 2nd Quarter 2012 Groundwater Monitoring County of San Joaquin—July 30,2012 <br />