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Table 4 Monitored Natural Attenuation Parameters - 2007 Investigation Summary Report NuStar Stockton Facility Stockton, California Well Dissolved Oxidation Natural Attenuation Parameters Sample Reduction Ammonia Ortho Total Organic Location Completion Sample Date Oxygen Potential Nitrate Nitrite Sulfate Alkalinity Total Methane Total Ethane Total Ethene Nitrogen Phosphate Carbon Iran Potassium Zone mg/l. mV Concentration in IL b 1 /29/2007 2 .50 43 < 100 < 100 120000 140000 18 < 10 < 10 120 6 .9 J 6300 140 6200 ACA- 113 B 4/30/2007 4 . 0 - 116 < 100 < 100 120000 110000 < 10 < 10 < 10 350 <25 7000 < 100 10000 7/30/2007 9 . 7 - 1 < 100 < 100 120000 95000 14 < 10 < 10 150 6 .0 J 6100 43 J 7700 10/29/2007 1 . 26 -99 < 100 < 100 140000 65000 31 < 10 < 10 140 <25 6500 < 100 4900 1 /30/2007 0 . 50 -48 < 100 < 100 33000 630000 430 < 10 < 10 < 100 450 39000 77 J 4800 ACA-213 B 4/30/2007 2 .60 - 166 < 100 < 100 1200 J 700000 3700 < 100 < 100 < 100 450 40000 < 100 4100 7/30/2007 1 . 0 21 < 100 < 100 2300J 610000 1100 < 100 < 100 160 290 34000 110 4000 10/30/2007 1 . 30 1 36 1 < 100 < 100 1300 1 730000 1 8500 <200 <200 46 J 290 28000 120 3800 PS/WC-31VI B 10/29/2007 0 . 50 -59 29 J < 100 45000 1 980000 110 < 10 < 10 < 100 1 340 15000 690 2200 Notes: 1 . mg/L = milligrams per liter 2 . mV = millivolts 3 . pg/L (ppb) = micrograms per liter (parts per billion ) 4 . < = not detected above the method reporting limit (MRL) 5 . J = estimated ; for further explanation , see : Appendix E 6 . J3 = the associated batch QC was outside the established quality control range for precision 7 . J5 = the sample matrix interfered with the ability to make any accurate determination ; spike value is high 8. J6 = the sample matrix interfered with the ability to make any accurate determination ; spike value is low Revised Cleanup Plan Stockton Facility 1014- 12 Page 2 of 2