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1 <br /> 15135 Eight Mile Road -5- 1 October 2018 <br /> Stockton, San Joaquin County <br /> approximately three inches of free product in MW-2. The greatest petroleum fuel constituent <br /> concentrations detected in groundwater at the Site since 1997 are presented in Table 3. DIPE, <br /> ETBE, and EDB were not detected above reporting limits in any grab groundwater samples obtained <br /> beneath the Site and or in the monitoring well network after 2006; tabulated results for these <br /> constituents are not available before 2006. The groundwater monitoring results from the most <br /> recent groundwater sampling events are presented in Table 4. <br /> Table 3 - Maximum Petroleum Constituent Concentrations Detected in Groundwater Since <br /> 1997 concentrations in micrograms per liter /L <br /> (fDeet bgs)eth TPHd TPHg Benzene Toluene be Ethylnzen- <br /> Xylenes <br /> MTBE TBA TAME 1,2-DCA <br /> 3 to 19 3,700,000 200,000 3,500 19,000 5,600 27,400 190,000 86,000" 1,370' 30* <br /> 50 to 80 4,200 6,500 140 800 77 370 8,300 90* 60* <0.5* <br /> bgs-below ground surface;TPHd-total petroleum hydrocarbons as diesel,TPHg-total petroleum hydrocarbons as gasoline, MTBE-methyl <br /> tertiary butyl ether;TBA-Tertiary-butyl alcohol;TAME-tertiary-amyl methyl ether; 1,2-DCA-1,2-Dichloroethane;'Tabulated results for this <br /> constituent not available before 2006 <br /> Table 4 - Most Recent Groundwater Analytical Results, <br /> May 2015 Unless Otherwise Noted, with Corresponding Water Quality Objectives (WQO) <br /> concentrations in micrograms per liter /L <br /> Depth/ TPHd TPHg Benzene Toluene Ethyl- Total MTBE TBA 1,2-DCA <br /> Location benzene Xylenes <br /> MW 19,000* 11,000* <0.5* <0.5* 6.3* 49* 15* 2,900* <0.5* <br /> 2 <br /> MW <50** 1,600 9.1 18 1.5 6.8 5.2 16,000 <0.5 <br /> 3 <br /> MW <50** 930 <0.5 2.0 1.1 1.4 13 350 <0.5 <br /> o) 4 <br /> M5 <50^ <50 <0.5 <0.5 <0.5 <0.5 8.8 130 <0.5 <br /> °' MW <50** <50 <0.5 <0.5 <0.5 <0.5 1.4 120 <0.5 <br /> 0 9 <br /> MW <50** <50 <0.5 <0.5 <0.5 <0.5 <0.5 <5 <0.5 <br /> 10 <br /> MW <501, <50 <0.5 <0.5 <0.5 <0.5 <0.5 <5 <0.5 <br /> 14 <br /> EW <50# 1,200 <0.5 <0.5 <0.5 <0.5 4.6 8,800 <0.5 <br /> 1 <br /> ch MW <50** <50 <0.5 <0.5 <0.5 <0.5 <0.5 <5 <0.5 <br /> 0' 6 <br /> MW <50** <50 <0.5 <0.5 <0.5 <0.5 <0.5 <5 <0.5 <br /> 7 <br /> � <br /> MW <50** <50 <0.5 <0.5 <0.5 <0.5 <0.5 <5 <0.5 <br /> 0 8 <br /> MW <50** <50^^ <0.5^^ <0.5^^ <0.5^^ <0.5^^ <0.5^^ <5^^ <0.5^^ <br /> 11 <br /> WQO 100• 100 lb 150b 300b 1750b 13b 1200 0.5b <br /> TPHd-total petroleum hydrocarbons as diesel,TPHg-total petroleum hydrocarbons as gasoline, MTBE-methyl tertiary butyl ether;TBA- <br /> Tertiary-butyl alcohol;TAME-tertiary-amyl methyl ether; 1,2-DCA-1,2-Dichloroethane;bgs-below ground surface;'6/29/2011 sampling <br /> results;"2/18/2009 sampling results,^6/30/2009 sampling results;^^9/30/2014 sampling event;#1/15/2010 sampling event'Taste and odor <br /> threshold;b California drinking water primary Maximum Contamination Level;`California Division of Drinking Water Response Level <br />