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Table 1 <br /> Second Quarter 2012 Groundwater Monitoring Results - Shallow Aquifer <br /> Corral Hollow Sanitary Landfill <br /> (Units mg/1 unless noted) <br /> Monitoring Point SB-1 MW-4 MW-5 MW-8 <br /> Monitoring Date Date Conc. Date Conc. Date I Conc. Date Conc. MCLS <br /> 5/21/12 Limit 5/21/12 Limit 5/21/12 Limit Trend 5/21/12 Limit MG/L <br /> Monitoring and Field Parameters <br /> Elevations(feet) _ <br /> TOC Elevation 275.46 i NR i 246.67 NR 300.93 NR NR 305.66 NR NR <br /> Depth to Groundwater 40.48 NR 18.54 NR 68.31 I NR_ NR 78.55 NR NR <br /> Groundwater Elevation j 234.98 ` lin l 228.13 j NR 232.62 �� NR NR 227.11 NR NR <br /> General Water Quality Parameters _ <br /> i 21.3 NR� R 16.7.30 NR NR 21.30 ! 19NNR NR <br /> Temperature(°C)(field) i f E ( _ _ __ _ 1 <br /> 6.81 6.89-7.7 7.21 6.78-8.0 7.29 _ 6.89-8.1 NS ! 6.91 € 6.89-8.2 6.5- <br /> H units (field) _ 1_ 8.5 <br /> Electrical Conductivi� ' NS <br /> US/CMfield € 884.3 1,700 1,394 3,400 1,053 2,400 �_- 736.4 i 970 900 <br /> Turbidity(NTU)(field) 28.6 200 24.7 490 11. j NS 25.2 91 NL <br /> Constituents of Concem <br /> Bicarbonate Alkalinity as I <br /> 660 590 430 390 590 650 € NS 280 310 NL <br /> HCO3 ! <br /> Carbonate Alkalinity as <br /> 03 ND 20 ND 20 I <br /> ND I 570 I NS ND 2.5 NL <br /> I <br /> pride _16 120 1 110 T 650 ! 98 280 € NS Y 35 150 250 <br /> Nitrate as Nitrogen _0.022* �� 42 I 10 59 s 14 j 45 mcr 10 _ 17 10 <br /> Sulfate 38 65 400 I 1300i 12 660 decr 16 37 250 <br /> Total Dissolved Solids 690 i 810 1200 2000 j 800 1500 incr 410 470 500 <br /> Volatile Organic Compounds *8260B u <br /> Chloroform ND detect ND detect {0.42*} detect I NS ND detect N_L <br /> 1,1-Dichloroethane ND I detect ? ND ! detect j 0.27* detect incr - 0.57 detect 5 <br /> Cis-1,2-Dichloroethene ( _ND detectND detect 0.41* detect incr 0.20* detect NL <br /> Dichlorodifluoromethane ND detect ND detect 6.0 _detect decr 5.0 detect NL <br /> _1,2-Dichloropropane ND detect ND detect 0.16* detect decr ND -� detect NL <br /> Methylene chloride ND detect I ND detect 0.79* detect NS -i 0.73* detect NL <br /> Tetrachloroethene CE ND detect ND detect 5.1 detect incr 4.9 �_ detect 5 <br /> Trichloroethene(TCE) ND detect ND detect 0.71 detect ! decr i 0.42* detect 5 <br /> Trichlorofluoromethane ND detect ND detect 4.7 detect NS i 7.0 i detect 150 <br /> Vinyl Chloride ( ND= detect ND detect 0.38* detect decr f ND-� detect 0.5 <br /> All Other Compounds ND detect ND detect ND I detect i NS ! ND j 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 <br /> 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 /> 01] <br /> Not established due to statistically significant increasing trend. Concentration limit from WDRs. <br /> Corral Hollow Sanitary Landfill 18 Department of Public Works/Solid Waste <br /> 2n°Quarter 2012 Groundwater Monitoring County of San Joaquin-July 30,2012 <br />