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I <br /> Table 1 <br /> First Quarter 2012 Groundwater Monitoring Results - Shallow Aquifer <br /> Corral Hollow Sanitary Landfill <br /> (Units mg/1 unless noted) <br /> ronitoring Point S13-1 MW-4 MW-5 MW-8 <br /> "onitoring Date Date Cone. Date Conc. Date Conc. Date Conc. MCLs <br /> 1/23/12 Limit 1/23/12 Limit 1/23/12 Limit Trend 1/23/12 Limit MG/L <br /> nitoring and Field Parameters <br /> Revations(feet) <br /> KTOC Elevation 275.46 NR 246.67 NR 300.93 NR NR 305.66 NR NR <br /> Depth to Groundwater 39.72 NR 17.76 NR 67.20 NR NR 78.53 NR NR <br /> Groundwater Elevation 235.74 NR 228.91 NR 233.73 NR NR 227.13 NR NR <br /> Weneral Water Quality Parameters <br /> 20.7 NR 16.2 NR 16.1 NR NR 16.2 NR NR <br /> Temperature('C)(field) <br /> gP 6.70 6.89-7.7 6.56 6.78-8.0 6.73 6.89-8.1 incr 7.12 6.89-8.8 6.5-8.5 <br /> Electrical Conductivity(us/cm) <br /> 1370 1,700 <br /> incr 677.3 1,600 900 <br /> 1186 1,300 1786 3,400 <br /> (field) <br /> Turbidity(NTU)(field) 21.7 320 24.7 290 16.7 220 deer 16.9 75 NL <br /> Constituents of Concem <br /> 200 240 140 190 NS NL <br /> MCalcium 93 150 58 <br /> Egagnesium 28 63 57 160 41 95 NS 16 1 NL <br /> 160 <br /> Sodium 140 310 260 59 <br /> 99 110 NS NL <br /> NS 3.5 <br /> 190 5.1 120 <br /> mpotassium 3.6 84 5.5 NL <br /> icarbonate Alkalinity as HCO3 j5-70 600 430 400 620 566.9 870 <br /> decr 270 NL <br /> .............. <br /> 2.5 <br /> 0.81 ND 200 ND 480 NS ND NL <br /> Carbonate Alkalinity as CaCO3 ND <br /> MC <br /> 1hloride 17 91 120 380 10 170 NS 36 490 250 <br /> ................... <br /> ate as Nitrogen 0.089 6.9 11 110 15 40 NS 11 <br /> 15 10 <br /> Vtr <br /> Sulfate 39 110 <br /> 250 420 1000 13 160 deer 16 250 <br /> Total Dissolved Solids 700 910 1 1300 2000 1 880 990 incr 420 1300 500 <br /> M <br /> qo1atile Qrganic Coppounds *8260B (ug! <br /> ND detect <br /> Chloroform ND detect 10.40*1 detect I NS ND detect NL <br /> 1,1-Dichloroethane ND detect ND detect 0.29* detect NS 0.60 detect 5 <br /> Cis-1,2-Dichloroethene ND detect ND detect 0.57 detect incr 0.20* detect NL <br /> detect 4.3 detect NS 5.5 detect NL <br /> Dichlorodifluoromethane ND detect ND <br /> 1,2-Dichloropropane ND detect ND detect 0.16* detect decr ND detect NL <br /> ...... ................... <br /> detect ND detect 0.62* detect NS 0.63* detect NL <br /> Methylene chloride ND <br /> Tetrachloroethene(PCE) ND detect ND detect 5.4 detect incr 5.1 detect 5 <br /> Trichloroethene(TCE) ND detect ND detect 0.91 detect decr 0.44* detect 5 <br /> Trichlorofluoromethane i ND detect i ND detect 5.1 detect NS 7.4 detect 150 <br /> Vinyl Chloride <br /> ND detect ND detect 0.30* detect decr ND detect 0.5 <br /> ........... <br /> All Other Compounds ND detect ND detect ND detect NS ND detect NR <br /> NR=Not Required ND=Not Detected *Trace Concentration(estimated value) <br /> NE=Not established,due to>50%non-detects NT=Not Tested Parameter also detected in one or more quality control blanks <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 /> Corral Hollow Sanitary Landfill 16 Department of Public Works/Solid Waste <br /> 1"Quarter 2012 Groundwater Monitoring County of San Joaquin-April 16,2012 <br />