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4O\A November 2013 <br /> Canepa's Car Wash Downtown <br /> 248 East Park Street, Stockton <br /> Claim No: 1695 <br /> ater <br /> Most Recent Concentrations of Petroleum Constituents E yl- Xylenes MTBE TBA <br /> Sample Sample TPHg Benzene Toluene Ethyl- <br /> Date (Ng/L) (Ng/L) (Ng/L) Benzene (Ng/L) (N9/L) lN9/L) <br /> IN /L) <5 <1 <br /> <0.5 <0.5 <0.5 `1 <1 <25 <br /> MW-1 9/21/200 <50 17 <U.5 7.1 22.6 <br /> 5/7/2012 12,000 <0.5 <1 <1 <10 <br /> <0.5 <br /> MW-2 <0.5 <5 <25 <br /> MW_3 9/21/2009 <50 <0.5 <0.5 <1 <br /> 11/17/2009 <50 <0.5 22,900 <5 <25 <br /> MW-4 98,000 32,000 15,000 4,500 <1 <5 <1 <br /> MW-5 5/7/2012 000 <0.5 <0.5 <0.5 <1 <br /> 9/21/2009 <0.5 <1 <5 <br /> MW-6 <50 <0.5 <0.5 <1 <5 <25 <br /> MW-7 9/21/2009 600 <0.5 <0.5 <0.5 <5 <br /> 11,000 <25 <br /> MW-8 4111/2011 4,000 4,200 3,300 <5 <25 <br /> MW_9 5/7/2012 60,000 _ 20 19 52 <br /> 5/7/2012 1,800 _ 6.5 2,500 8,800 <5 <25 <br /> MW-10 49,000 12,000 9,600 1,014 <5 <25 <br /> MW_11 5/7/2012 - 1,600 320 1,900 <5 <25 <br /> MW-12 5/7/2012 24,000 <0.5 <0.5 `1 <br /> <50 <0.5 10,100 <5 <25 <br /> MW-13 4/10/2013 -- 8,300 7,400 1,900 <5 <25 <br /> MW-14 4/10/2013 70,000 <0.5 <0.5 <1 <br /> 4/10/2013 <50 <0.5 5.4 <5 <25 <br /> MW-15 23 <0.5 <0.5 130 <5 <25 <br /> MW-16 4/10/2013 <50-- 410 26 230 <br /> MW-17 4/10/2013 3,200 11,000 44,000 <5 <25 <br /> <1 <10 <br /> MW_18 5/7/2012 240,000 41,000 55,00 17 5a 1,200 <br /> MW_19 12/14/2011 250,000 27,0005 64,042 13,029 61,000 <br /> W40s -- 5 <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 /> t' California Department of Public Health, Response Level <br /> Groundwater Trends <br /> ater monitoring wells have been installed and regularly <br /> Since 1994, nineteen groundw <br /> monitored. Benzene trends of select wells are shown below: <br /> Page 8 of 13 <br />