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Table 4 <br /> Monitored Natural Attenuation Parameters 2007 <br /> Investigation Summary Report - NuStar Stockton Facility <br /> Stockton , California <br /> Well Dissolved <br /> Oxidation Natural Attenuation Parameters <br /> Sample Reduction Ammonia Ortho Total Organic <br /> Location Completion Sample Date Oxygen Potential Nitrate Nitrite Sulfate Alkalinity Total Methane Total Ethane Total Ethene Nitrogen Phosphate Carbon Iron Potassium <br /> Zone <br /> mg/L my Concentration in /L b <br /> Upgradiiient Wells <br /> ST/WC- 1AA 7/31 /2007 1 . 87 -43 < 100 < 100 730000 630000 27 < 10 < 10 180 220 70000 6200 2500 <br /> 10/29/2007 0 .40 28 48J < 100 850000 870000 < 10 < 10 < 10 < 100 46 14000 3200 2300 <br /> 7/31 /2007 5 . 70 76 .2 4600 < 100 670000 430000 < 10 < 10 < 10 < 100 100 14000 130 5100 <br /> ST/WC- 1B B 5/1 /2007 1 . 6 -5 190 < 100 61000 1000000 8J < 10 < 10 310 1100 10000 530 3000 <br /> 10/29/2007 1 . 50 94 4400 < 100 740000 600000 < 10 < 10 < 10 < 100 74 12000 320 4600 <br /> PS/P-21 A 7/30/2007 0 . 95 -5 < 100 < 100 350000 370000 14 < 10 < 10 < 100 56 ..............14000 77 J 1900 <br /> 10/29/2007 0 .40 1 120 1 < 100 I < 100 1 370000 1 470000 1 16 1 < 10 I < 10 < 100 59 1 12000 36J 1700 <br /> Source Area Wells <br /> 4/30/2007 0 . 9 - 125 < 100 < 100 <5000 1100000 3300 < 100 < 100 < 100 880 93000 6700 940 <br /> :q:A <br /> 7/30/2007 0 .89 -94 .8 < 100 < 100 850 J 1100000 5000 < 100 < 100 63 J 770 210000 5900 1300 <br /> 10/30/2007 1 . 80 25 < 100 < 100 640J 1200000 4800 < 100 < 100 220 790 160000 5500 1000 <br /> PS/ 7/30/2007 0 . 8 -57 < 100 < 100 <5000 730000 10000 <200 <200 < 100 490 74000 14000 1200 <br /> 10/30/2007 1 . 50 65 < 100 < 100 230 J 860000 7700 <200 <200 35 J 640 41000 13000 1200 <br /> 1 /30/2007 2 . 9 -28 < 100 < 100 <5000 430000 4300 < 100 < 100 730 950 11000 14000 310 J <br /> PS/P-11 A 4/30/2007 0 . 24 - 123 < 100 < 100 780 J 380000 520 < 10 < 10 710 1000 13000 14000 600 <br /> 7/30/2007 0 .45 -59 < 100 < 100 410 J 340000 1100 <40 <40 870 700 14000 6100 410 J <br /> 10/30/2007 0. 10 -90 < 100 < 100 500 J 400000 1 2300 < 100 < 100 1100 740 18000 15000 2000 <br /> 1 /30/2007 0 .80 -37 47 J 24 J 4500 J 330000 1800 < 100 < 100 200 1000 6900 3100 J61 J3 330 J , J61 J3 <br /> :PPS:/P- 131A 4/30/2007 0 . 10 -201 < 100 28 J 4100 J 270000 700 <40 <40 100 910 11000 2300 350 J <br /> 7/30/2007 0.42 -55 < 100 < 100 440 J 260000 2400 < 100 < 100 230 810 15000 2400 440 J <br /> 10/30/2007 1 0 . 20 1 -55 1 < 100 I < 100 1700 J 340000 2500 < 100 < 100 420 920 9400 2700 700 <br /> Downgradient Wells <br /> 1 /29/2007 0 . 60 -66 < 100 19 J <5000 760000 3600 < 100 < 100 82J 310 12000 3400 1500 <br /> PS/MW- 15 A 4/30/2007 0 . 90 - 197 < 100 < 100 <5000 780000 2600 < 100 < 100 < 100 460 14000 3300 1600 <br /> 7/30/2007 2 .00 -75 < 100 < 100 <5000 690000 4400 < 100 < 100 62J 400 220000 4700 1700 <br /> 10/29/2007 0 . 20 - 115 < 100 < 100 2500 J 790000 5800 <200 <200 80 J 420 18000 4000 1800 <br /> 1 /29/2007 1 .40 9 < 100 < 100 92000 830000 580 < 100 < 100 < 100 350 9700 4400 1700 <br /> ACA-1A A 4/30/2007 0 .57 - 132 < 100 < 100 19000 880000 1200 <40 <40 < 100 340 190000 4000 1600 <br /> 7/30/2007 0 .40 -67 < 100 < 100 8700 680000 280 < 100 < 100 < 100 310 15000 4100 1800 <br /> 10/29/2007 1 . 30 - 108 160 < 100 14000 910000 1 2200 < 100 < 100 < 100 440 24000 4600 1500 <br /> 1 /30/2007 1 . 10 86 < 100 62 J 160000 810000 24 < 10 < 10 < 100 300 5400 150 2600 <br /> ACA-2A A 4/30/2007 1 . 90 -87 < 100 < 100 150000 790000 22 < 10 < 10 < 100 270 6600 < 100 2100 <br /> 7/30/2007 0 . 60 55 .4 < 100 < 100 170000 J6 640000 27 J5 < 10 < 10 < 100 290 11000 120 1500 <br /> 10/30/2007 1 .60 28 < 100 < 100 170000 800000 48 < 10 < 10 62 J 290 7600 150 1200 <br /> Please refer to notes at end of table. <br /> Revised Cleanup Plan <br /> Stockton Facility <br /> 1014- 12 <br /> Page 1 of 2 <br />