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SUMMARY OF GROUNDWATER MONITORING DATA <br /> Second Quarter 1993 <br /> ARCO Service Station#2168 <br /> 441 Charter Way,Stockton <br /> (micrograms per liter(p.g/i), unless noted) <br /> Floating <br /> Well ID Depth to Product Total 1,2- 1,2- <br /> and Sample Sampling Water Thickness Ethyl- Total TPH as Oil& Hydrocarbons, Methylene Dichloro- Dichloro- <br /> De th Date feet (feet) Benzene Toluene benzene Xylenes Gasoline Grease Gravimetric Chloride ethane propane <br /> MW-1 (54) 06/10/93 3858 -- 5,600 640 470 1,400 23,000 -- -- ND 61 08 <br /> MW-2(53) 06/10/93 3894 -- 3,700 1,800 280 1100 19,000 ND ND 06 16 64 <br /> MW-3(53) 06/10/93 3742 - 12,000 2,100 1,800 3,200 44,000 -- __ ND ND ND <br /> MW4(59) 06/10/93 4068 - 9,100 17,000 2,700 13,000 110,000 - -- <5* 43 <5* <br /> MW-5(55) 06/10/93 3734 - 6,400 4,100 870 3,800 37,000 -- - <10* 130 <10* <br /> TPH=Total petroleum hydrocarbons <br /> ND=Not detected <br /> *=Raised MRL due to high analyte concenvanon nuiring sam le dflunon <br /> OG71-038 01 <br /> i <br />