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Canepa's Car Wash Downtown _ November 2013 <br /> 248 East Park Street, Stockton <br /> Claim No: 1695 <br /> Most Recent Concentrations of Petroleum Constituents in Groundwater <br /> Sample Sample TPHg Benzene Toluene Ethyl- Xylenes MTBE TBA <br /> Date (Ng/L) (Ng/L) (Ng/L) Benzene (Ng/L) (Ng/L) (Ng/L) <br /> (N /L) <br /> MW-1 9/21/2009 <50 <0.5 <0.5 <0.5 <1 <5 <1 <br /> MW-2 5/7/2012 12,000 17 <0.5 7.1 22.6 <1 <25 <br /> MW-3 9/21/2009 <50 <0.5 <0.5 <0.5 <1 <1 <10 <br /> MW-4 11/17/2009 <50 _ <0.5 <0.5 <0.5 <1 1 <5 <25 <br /> MW-5 5/7/2012 98,000 _32,000 15,000 4,500 22,9001 <5 <25 <br /> MW-6 9/21/2009 <50 <0.5 <0.5 <0.5 <1 <5 <1 <br /> MW-7 9/21/2009 <50 <0.5 <0.5 <0.5 <1 <5 <1 <br /> MW-8 4/11/2011 600 _ <0.5 <0.5 <0.5 <1 <5 <25 <br /> MW-9 5/7/2012 60,000 4,000 4,200 3,300 11,000 <5 <25 <br /> MW-10 5/7/2012 1,800 6.5 20 19 52 <5 <25 <br /> MW-11 5/7/2012 49,000 12,000 9,600 2,500 8,800 <5 <25 <br /> MW-12 5/7/2012 24,000 1,600 320 1,900 1,014 <5 <25 <br /> MW-13 4/10/2013 <50 <0.5 <0.5 <0.5 <1 <5 <25 <br /> MW-14 4/10/2013 70,000 8,300 7,400 1,900 10,100 <5 <25 <br /> MW-15 4/10/2013 <50 <0.5 <0.5 <0.5 <1 <5 <25 <br /> MW-16 4/10/2013 <50 23 <0.5 <0.5 5.4 <5 <25 <br /> MW-17 4/10/2013 3,200 410 26 230 130 <5 <25 <br /> MW-18 5/7/2012 240,000 41,000 55,000 11,000 44,000 <5 <25 <br /> 12/14/2011 250,000 27,000 64,000 13,000 61,000 <1 <10 <br /> WQOS Os -- 5 0.15 42 29 17 5a 1,200 <br /> NA: Not Analyzed, Not Applicable or Data Not Available <br /> pg/L: Micrograms per liter, parts per billion <br /> <: Not detected at or above stated reporting limit <br /> TPHg: Total petroleum hydrocarbons as gasoline <br /> MTBE: Methyl tert-butyl ether <br /> TBA: Tert-butyl alcohol <br /> WQOs: Water Quality Objectives <br /> (Regional Water Board) Basin Plan <br /> a: Secondary maximum contaminant level (MCL) <br /> b'. California Department of Public Health, Response Level <br /> Groundwater Trends <br /> • Since 1994, nineteen groundwater monitoring wells have been installed and regularly <br /> monitored. Benzene trends of select wells are shown below: <br /> Page 8of13 <br />