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California Water Service Company TABLE 1.0-SUMMARY OF SAMPLE RESULTS 1/16/12 1602 E.Lafayette St.,Stockton,CA PCBs VOCs Cd Cr III Cr VI Pb Ni Zn TPHg TPHd Sample ID Location Date Time mg/kg mg/kg m /k m /kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg 001 Pipe Trench(east) 12/13/11 1:45 PM <0.05 NO <0.25 35 <4.0 5.3 26 50 <1.0 240 002 Pipe Trench(middle) 12/13/11 2:24 PM <0.05 ND <0.25 38 <4.0 6.0 28 60 <1.0 190 003 Pipe Trench(west) 12/13/11 2:05 PM <0.05 NO <0.25 32 <4.0 6.4 27 51 <1.0 <1.0 TP 1 NE corner(Tank 2-east) 12/13/11 2:40 PM <0.05 ND <0.25 42 <4.0 6.7 30 61 <1.0 110 TP 2 SE corner(Tank 1 -east) 12/13/11 2:45 PM <0.05 ND <0.25 43 <4.0 6.7 28 65 <1.0 <1.0 TP 3 NW corner(Tank 2-west) 12/13/11 2:50 PM <0.05 ND <0.25 57 <4.0 9.2 48 93 <1.0 76 TP 4 SW corner(Tank 1 west) 12/13/11 3:00 PM <0.05 ND <0.25 46 <4.0 7.6 36 69 <1.0 <1.0 PILE 1 Center of main stockpile 12/13/11 3:05 PM <0.05 NO <0.25 34 <4.0 9.5 23 49 <1.0 7.5 PILE 2 North end of main stockpile 12/13/11 3:20 PM <0.05 ND <0.25 36 <4.0 24 27 66 <1.0 36 PILE 3 SW end of main stockpile 12/13/11 3:30 PM <0.50 ND <0.25 49 <4.0 40 34 81 <1.0 46 PILE 4 SE end of main stockpile 12/13/11 3:40 PM <0.05 ND <0.25 44 <4.0 36 33 110 <1.0 11 PILE 5 Trench stockpile 12/13/11 3:55 PM <0.05 ND <0.25 43 <4.0 44 29 70 <1.0 1.9 4E South trench(east) 12/15/11 10:45 AM <1.0 ND <1.5 35 <4.0 7.8 24 49 ND 390 5W South trench(west) 12/15/11 11:00 AM <1.0 ND <1.5 33 <4.0 6.1 30 46 ND 630 6E North trench 4"line(east) 12/15/11 11:25 AM <0.05 ND <1.5 42 <4.0 6.6 29 55 ND <1.0 7M North trench 4"line(middle) 12/15/11 11:35 AM <0.05 ND <1.5 36 <4.0 6.0 25 45 ND <1.0 8W North trench 4"line(west) 12/15/11 11:45 AM <0.05 ND <1.5 37 <4.0 5.4 24 48 ND <1.0 9-PH Pot-hole sample(east) 12/19/11 10:38 AM <0.25 ND <1.5 60 <4.0 6.5 41 86 ND 19 10-PH Pot-hole sample(middle) 12/19/11 11:00 AM <0.25 ND <1.5 57 <4.0 7.1 37 81 ND 120 11-PH Pot-hole sample(at 90 turn) 12/19/11 11:20 AM <0.50 ND <1.5 53 <4.0 45 37 190 ND 270 12-PH Pot-hole sample(at bldg 2'below pipes 12/19/11 11:30 AM <0.50 ND <1.5 56 <4.0 21 38 150 ND 430 13-PH Pot-hole sample(at bldg 4'below pipes 12/19/11 12:05 PM <0.25 ND <1.5 57 <4.0 7.4 37 87 ND 140 4`5 ;- E .y- „aro .FIR,". - v _sMM „- 14-FDN Under building foundation 1/10/12 11:11 AM <0.05 ND <1.5 59 <4.0 8 42 76 <1.0 <1.0 RSL 8.0E+02 1.5E+06 5.6E+00 8.0E+02 2.0E+04 3.1E+05 VOCs(8260)include BTEX,CL HC,Oxygenates(MTBE,TBA,DIPE,ETBE,TAME), 1,2 DCA&EDB RSL=Regional Screening Levels:Industrial