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 Ng/L= parts per billion(ppb) SAMPLE I.D. B-10 B-11 B-12 B-13 B-14 B-16 B-17 B-18 MCL' SAMPLING DATE 5115108 5115108 5115108 5115108 5116108 5116108 5116108 5116108 otal PCBS ND<50 ND<5.0 ND<0.5 4.6 ND<5.0 3.0 ND<0.5 No<0.5 0.5 PH-gasoline ND<50 ND<50 ND<50 ND<50 ND<50 ND<50 ND<50 ND<50 210' PH-diesel 63 110 ND<50 250 60 170 100 870 210' PH-motor oil ND<250 ND<250 ND1250 350 ND<250 560 250 360 210' nlimony* ND<0.5 1.6 ND<0.5 0.62 0.53 0..83 1.5 1.2 6 rsenic* 12 38 5.6 2.5 24 1.3 11 3.0 50 Barium* 66 170 130 43 350 86 190 70 1,000 Beryllium* ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 4 Cadmium* ND<0.25 ND<0.25 ND<0.25 0.67 ND<0.25 0.96 0.59 0.59 5 hromium* ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 50 Cobalt* 0.90 1.1 7.4 2.8 0.84 7.0 4.7 5.4 - Copper* 1.6 ND<0.5 1.1 7.7 0.89 12 0.89 2A 1,300 Lead* ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND4.5 ND<0.5 ND<0.5 ND<0.5 15 Mercury* 0.018 0.019 0.024 0.027 0.055 0.024 0.033 0.027 2 Molybdenum* 11 12 38 20 9.1 18 47 96 - Nickel* 4.5 4.5 9.2 11 2.4 11 9.6 9.4 100 Selenium* ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 0.64 ND<0.5 ND<0.5 50 Silver* ND<0.19 ND<0.19 ND<0.19 ND<0.19 ND<0.19 ND<0.19 ND<0.19 ND<0.19 10 L m* ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 2 ium* 23 3.2 3.7 3.3 0.64 13 1.8 2.1 503 5.0 ND<5.0 16 180 17 200 160 23 5,000 e ND<10 ND<10 47 43 ND<10 ND<10 ND<10 ND<10 - 1 benzene ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 2603 2-Dichloroethene ND<0.5 0.53 ND<0.5 ND<o,5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 6 l alcohol(TBA) ND<2.0 ND<2.0 ND<2.0 ND<2.0 ND<2.0 ND<2.0 ND<2.0 ND<2.0 123 utyl benzene ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 0.91 2603 enzene ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<o.5 ND<o.5 ND<0.5 300 pyl benzene ND<0.5 ND<05 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 7703 yl benzene ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 2603 l-t-butyl ether(MTBE) ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<0.5 1.3 1.2 13 B-1 through B-7:Analyzed for Total 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 3 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.