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Table 1 Monitoring Well Construction Details Investigation Summary Report - NuStar Stockton Facility Stockton , California Well Details Well Screen Filter Pack Bentonite Former Well Installation TOC/PVC Ground Surface Current Well ID Well ID Completion Latitude Longitude Date Elevation Elevation Depth Depth Diameter Top Top Bottom Bottom Length Top Top Top Top Zone (feet MSL) (feet MSL) (feet bgs) (feet MSL) (inches) (feet bgs) (feet MSL) (feet bgs) (feet MSL) (feet) (feet bgs) (feet MSL) (feet bgs) (feet MSL) ST/MW-1 A 37 .9409922 - 121 .3315743 13-Jul-92 -0 . 21 -- 20 -20 .21 2 5 -5 .21 18 -18 .21 13 4 .5 4 .71 3 .5 -3 .71 ST1WC-1A A 37 .9413884 -121 .3332728 28-Ju1-94 1 .99 2 . 2 20 - 17 .8 4 5 .4 -3 .2 19.2 -17 13 .8 4 - 1 .8 2 .5 -0 . 3 PS/P-10 P-10 A Jan-87 0 .78 0 . 1 10 -9 . 22 1 5 4 .22 10 .0 -9. 22 5 . 0 PS/P-11 P-11 A 37 .9415389 -121 . 3311325 Jan-87 1 .03 2.7 10 -7 . 30 1 5 -2. 30 10 .0 -7 .3 5.0 -- -- -- PS/P-12 P- 12 A 37 .9412881 - 121 . 3310211 Jan-87 1 .78 3 .33 10 -6 .67 1 5 - 1 .67 10 .0 -6 .67 5.0 PS/P-13 P- 13 A 37 .9410255 - 121 .3309197 Jan-87 1 . 64 2 .44 10 -7 .56 1 5 -2 .56 10 . 0 -7 .56 5.0 PS/P-21 P-21 A 37 .9404655 -121 . 3328258 Jan-87 2.25 2 .79 10 -7 .21 1 5 -2 .21 10.0 -7 .21 5 .0 PS/P-23 P-23 A 37 . 9413001 -121 . 3337285 Jan-87 1 .94 3 . 16 10 -6 . 84 1 5 -1 .84 10.0 -6 . 84 5 .0 -- -- PS/MW- 14 A 37 .9415529 - 121 .3312706 16-Jul-92 1 .33 1 .6 15 -13 .4 2 5. 1 -3 . 5 14 .2 -12 .6 9 . 1 4. 5 -2.9 3. 5 -1 .9 PS/MW-15 A 37 .9409142 -121 .3305109 16-Jul-92 1 .75 4 . 18 19 -14 .82 2 9. 1 4 .92 18 .2 - 14 . 02 9 . 1 8.5 4 .32 7 .5 -3 .32 PS/MW-17 A 37 .9401001 -121 .3294936 17-Jul-92 2 . 22 2 .63 19 -16 .37 2 8 .7 -6 .07 17 .8 -15. 17 9 . 1 7 .5 4 .87 6.5 -3.87 PS/MW-19 A 37 . 9417042 -121 .3294988 17-Jul-92 3 .58 4 .02 20 -15 .98 2 5 . 1 - 1 .08 1942 -15. 18 14 . 1 4.5 -0 .48 3.5 0 .52 PS/WC-2S A 37. 9417439 -121 . 3310105 23-Jul-92 2 .48 2.62 20 -17 . 38 2 5 . 1 -2 .48 19. 2 -16 .58 14 . 1 4.5 -1 .88 3 .5 -0 .88 PSfWC-3S A 37 .9409017 -121 .3288752 17-Jul-92 1 .58 1 .98 17 -15.02 2 7 . 1 -5 . 12 16.2 -14 .22 9. 1 6 -4 .02 5 -3 .02 PS/WC-4S6 A 37 .939797 - 121 .330732 16-Jul-92 5 . 04 0 .81 15 -14 . 19 2 5. 1 4 .29 14.2 -13 .39 9. 1 4 .5 -3 .69 3 .5 -2 .69 UP/MW-1 MW-1 A 37 . 9397904 -121 .3316720 3-Jun-88 0 .55 0 . 89 20 -19 . 11 4 10.0 -9. 11 20 .0 -19 . 11 10 .0 8 -7 . 11 5 4 . 11 UP/MW-3 MW-3 A 3-Jun-88 -1 .8 -0 .92 20 -21 .80 4 10 .0 - 11 .80 20 .0 -21 .80 10 .0 8 480 5 -6 . 80 OW-7A A 37 .9411765 - 121 . 3261167 9-Aug-02 1 .86 2 .25 16 -13 .75 2 4 - 1 .75 16 -13.75 12 3 -0.75 2 0 .25 0W-8A A 37 .9399888 - 121 .3273657 9-Aug-02 2 .08 2 .45 16 -13 .55 2 4 -1 .55 16 -13 .55 12 3 -0 .55 2 0 .45 ACA-1A6 A 37 .940534 -121 .330589 14-Sep-06 4 .79 4 .62 25 -20 .38 2 15 -10 . 38 25 -20 .38 10 13.5 -8 .88 11 -6 .38 ACA-2A6 A 37 . 941143 -121 .330584 13-Sep-06 8.22 4 . 89 25 -20 . 11 2 15 -10 . 11 25 -20 . 11 10 13 .5 -8 .61 11 -6 . 11 STMC- 16 B 37 .9413606 -121 . 3333085 25-Jul-94 1 .8 2 .29 32 -29 .71 4 27 -24 .71 31 .2 -28 .91 4 . 2 26 -23.71 21 -18.71 PS/WC-2M B 37.9417275 -121 .3310061 23-Jul-92 2 .3 2.58 35 -32.42 2 29 .4 -26 .82 33 .8 -31 .22 4.4 28 -25.42 27 -24 .42 PS1WC-3M B 37 .9409043 -121 .3288541 23-Jul-92 1 .74 2 .29 27 -24.71 2 21 .4 -19. 11 25 .7 -23 .41 4.3 20 -17 .71 18.5 - 16.21 PS/WC-4M B 37 .939805 -121 .330718 20-JukK 4 . 69 0 .73 35 -34 .27 2 25.4 -24 .67 34 .6 -33 .87 9.2 24 -23 .27 22.5 -21 .77 0W-713 B 37 . 9411698 -121 . 3261449 21 -Aug-02 1 .81 2 . 19 29 -26 .81 2 19 -16 . 81 29 -26.81 10 17 -14 .81 14 -11 .81 OW-86 B 37 .9399704 - 121 .3273893 21 -Aug-02 2 .06 2 .45 28 -25 .55 2 18 -15 . 55 28 -25 .55 10 16 - 13 .55 13 -10 .55 ACA-3A/B A/B 37.940619 -121 .331381 2-Sep-09 3 .53 4 .05 23 -26 . 53 2 13 -8 . 95 23 -18 .95 10 12 -7 .95 10 -5 .95 ACA4A/B -- A/B 37 .941076 - 121 .329581 4-Sep-09 4 . 14 4 .46 25 -29 . 14 2 15 - 10 .54 25 -20 .54 10 14 -9.54 12 -7 . 54 ACA-1 B6 C 37 .941143 -121 .330229 27-Oct-06 4 .59 4 .74 54 49.26 2 44 -39.26 54 49 .26 10 41 -36. 26 37 -32 .26 ACA-266 C 37 .941118 -121 .330234 27-Oct-06 8. 13 4 .49 51 46 .51 2 41 -36.51 51 46 . 51 10 36 -31 .51 34 -29 .51 ST/WC- 1C C 37 .9413312 - 121 .3333469 25-Jul-94 1 .44 2 .55 55 -52 .45 4 45 42 .45 54 .2 -51 .65 9.2 41 -38.45 37 -34 .45 OW-7C C 37 .9411653 - 121 .3261771 16-Aug-02 1 .83 2.24 63 -60 .76 2 53 -50 . 76 63 -60 .76 10 51 48.76 48 -45 .76 OW-8C C 37 .9399991 -121 .3273976 20-Aug-02 2 . 02 2.43 57 -54 . 57 4 47 -44 . 57 57 -54 .57 10 44 41 .57 40 -37 .57 ACA-3C C 37 .940628 -121 .331366 2-Sep-09 3 .6 4 .08 54 -54 .98 2 44 -39 . 92 54 49.92 10 43 -38 .92 43 -38 .92 ACA-4C C 37 . 941079 -121 .329565 3-Sep-09 3.92 4 .44 44 . 5 48 .42 2 32 .5 -28. 06 44.5 40.06 12 30 .5 -26 .06 30.5 -26.06 ACA-5C C 37 .940874 -121 . 328810 3-Sep-09 4 .02 4 .43 44 48 .02 2 34 -29.57 44 -39.57 10 33 -28 .57 33 -28 .57 OW-6D D 37 .9405373 - 121 . 3289853 19-Aug-02 1 .86 2 .51 90 -87 .49 2 80 -77 .49 90 -87.49 10 78 -75.49 75 -72 .49 OW-7D D 37 .9411600 -121 .3262099 12-Aug-02 1 . 85 2 .25 91 -88 .75 2 81 -78 .75 91 -88.75 10 79 -76 .75 76 -73 .75 ACA-31D D 37 .940612 -121 .33139311 23-Aug-10 3 . 69 4 . 16 70 .25 -66 .56 2 60 -56 . 31 70 -66 .31 10 58 -54 . 31 54 -50 .31 ACA-5D -- D 37 .940903 -121 .32871137 24-Aug- 10 4.58 5 .08 87 -87 .67 2 87 -82 .42 92 -87 .42 5 85 -80 .42 81 -76 .42 Notes: 1 . TOC = Top of casing . 4. bgs = Below ground surface . 2. PVC = Polyvinyl chloride . 5 . -- = Historical logs or data unavailable/survey data pending . 3. feet MSL = Feet relative to mean sea level . 6 . Survey benchmark does not match, or correspond to, historical survey benchmark data . Investigation Summary Report Stockton Facility 1014-09 Page 1 of 1