ARCHIVED REPORTS_PHASE II ENVIRONMENTAL SITE ASSESSMENT

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• TABLE 2 - SUMMARY OF GROUNDWATER SAMPLE ANALYSIS THE LEARNER COMPANY, 2711 NAVY DRIVE, STOCKTON, CALIFORNIA WGR - MAY 2008 All concentrations presented in pg/L= parts per billion (ppb) SAMPLE I.D. B-1 B-2 B-3 B-4 B-5 B-6 B-7 I B-8 I B-9 MCL' SAMPLING DATE 5114108 5114108 5114108 5114108 5114108 5114108 5114108 5115108 5115108 otal PCBs ND<50 ND<0.5 1.4 1.2 ND<5.0 15 3.6 ND<50 ND<0.5 0.5 PH-gasoline ND<50 800 ND<50 ND<50 ND<50 ND<50 ND<50 ND<50 ND<50 210' PH-diesel 640 960 120 210 300 270 610 1,100 97 210' PH-motor oil 2,200 590 ND<250 320 890 770 3,200 620 ND<250 210' ntimony` ND<10 ND<0.5 ND<0.5 0.57 ND<10 ND<0.5 ND<0.5 0.53 0.84 6 rsenic' 210 150 190 55 320 240 120 6.8 16 50 Barium' 11,000 3,600 5,300 970 10,000 16,000 2,000 40 71 1,000 Beryllium' 16 4.7 6.6 1.3 24 32 3.4 ND<0.5 ND<0.5 4 Cadmium' 92 7.1 7.7 1.9 49 13 8.4 ND<0.25 ND<0.25 5 Chromium* 610 240 340 96 940 630 190 ND<0.5 ND<0.5 50 Cobalt* 410 170 310 42 470 610 78 2.0 2.1 - Copper' 2,900 490 810 210 2,900 1,800 400 1.2 ND<0.5 1,300 Lead' 7,100 370 470 120 2,400 920 350 ND<0.5 ND<0.5 15 • Mercury' 15 0.48 1.3 0.30 6.8 2.7 0.56 0.036 0.024 2 Molybdenum` 11 10 4.2 22 ND<10 3.4 6.5 37 28 - Nickel" 1,200 310 520 110 1,200 1,300 260 5.5 4.3 100 Selenium' ND<10 2.4 3.5 1.2 ND<10 9.7 3.0 ND<0.5 ND<0.5 50 Silver' 7.9 0.99 2.5 0.40 14 5.1 0.84 ND<0.19 ND<0.19 10 Thallium* ND<10 3.9 5.5 0.67 FN 8.5 2.7 ND<0.5 ND<0.5 2 Vanadium' 920 620 950 200 990 450 11 0.77 50' Inc` 53,000 2,000 3,900 690 6,400 2,900 6.2 33 5,000 Acetone ND<10 ND<10 ND<10 ND<10 ND<10 ND<10 ND<10 ND<10 - n-Butyl benzene ND<0.5 7.2 ND<0.5 ND<0.5 D<0.5 ND<0.5 ND<0.5 ND<0.5 260' Cis-1,2-Dichloroethene ND<0.5 ND<0.5 ND<0.5 ND<0.5 D<0.5 ND<0.5 ND<0.5 ND<0.5 6 -Butyl alCOhot(TBA) ND<2.0 ND<2.0 ND<2.0 ND<2.0 ND<2.0 0 ND<2.0 2.7 ND<2.0 123 Sec-Butyl benzene ND<0.5 8.9 ND<0.5 ND<0.5ND<0.5 ND<0.5 N0<0.5 ND<0.5 260'Ethylbenzene ND<0.5 4.4 ND<0.5 ND<0.5ND<0.5 ND<0.5 ND<0.5 ND<0.5 300 Isopropyl benzene ND<0.5 7.4 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 770' n-Propyl benzene ND<0.5 32 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 2603 Methyl-t-butyl ether(MTBE) ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 0.89 ND<0.5 I ND<0.5 ND<0.5 13 B-1 through B-7:Analyzed for Tota/CAM 17 metals; B-8 through B-18:Analyzed for Dissolved CAM 17 metals MCL:CA Primary Maximum Contaminant Level for drinking water(Title 22,CA Code of Regulations) • 'San Francisco RWQCB ESLs(Environmental Screening Levels)Tables B, D and F1-13 CA Department of Health Services notification level for drinking water ND:Not Detected at reporting limit listed. All samples ND for Semi-Volatile Organic Compounds(SVOCs)and Volatile Organic Compounds(VOCs)except those listed.