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M M M le 1 Groundwater Elevations and Analytical Data Parkinson's Arco 3250 West Hammer Lane Stockton,California Top of Casing Depth to Groundwater TPH as Ethyl- Sample Date Elevation Water Elevation Gasoline Benzene Toluene benzene Xylenes MtBE D1PE ETBE TAME TBA 1,2 DCA Identification Sampled MSL feet b s MSL (u/l (ugh) (u,1) All) u fi (Ugh) u A u 11 u 11 u 11 EDB u Il u fl Mw-4 07/29/02 4 80 i'1 1328 -848 <50 11 <0 3 <0 3 <0 6 14,000 <50 88 160 <50 10/07/02 1412 -932 <50 <0 30 <0 30 <0 30 <0 60 9,600 <50 <50 110 140 01/02/03 13 56 -876 <50 33 073 <0 30 11 14,000 <50 <5 0 <5 0 <50 04/03/03 1335 -855 <50 <0 50 <0 50 <0 50 <10 12,000 <50 <5 0 200 <50 07121103 1393 -913 <50 <050 <050 <0 50 <10 14,000 <50 <5 0 250 <50 10/13/03 1470 -990 <50 <050 <0 50 <0 50 <10 9,900 <100 <100 <100 <1000 <100 <100 01/12104 1397 917 <50 2 8 <0 50 <0 50 <1 0 5,100 <0 50 <050 35 5 500 <0 50 <050 06122/04 1376 -896 410F4 43 092 <0 50 <10 790 <25 <25 <25 2 800 <25 <25 08/12/04 1427 947 <50 12 <0 50 <0 50 <1 0 16 <0 50 <0 50 <0 50 1,100 <0 50 <0 50 10121104 1451 -971 <50 11 24 <0 50 <1 0 15 <0 50 <0 50 085 1,700 <0 50 <0 50 01/17/05 1342 -862 <50 06 <0 50 <0 50 <1 0 1,800 <0 50 <0 50 310 <500 <0 50 <050 04/18/05 1203 -723 95 <0 50 <0 50 <0 50 <1 0 930 <10 <10 <10 <100 <10 <10 MW 5 07/29102 513111 1361 -848 <50 <0 3 0 9 <03 12 18,000 <25 <25 150 5,700 10/07/02 1440 -927 <50 <0 30 042 <030 <0 60 29,000 <250 <250 <250 5,600 01/02/03 1387 -874 <50 <0 30 038 <0 30 <0 60 41,000 <50 <5 0 230 12,000 04/03/03 1361 -848 <50 <0 50 <0 50 <0 50 <1 0 29,000 <50 <5 0 370 540 07/21/03 1425 -9 12 <50 <050 <0 50 <0 50 <1 0 10 000 <50 <50 <50 41 000 10/13/03 1502 9 89 <50 <0 50 <0 50 <050 <10 8,800 <100 <100 <100 <1000 <100 <100 01112104 1431 918 <50 <0 50 <0 50 <050 <1 0 1,300 <0 50 <050 15 19,000 <0 50 <0 50 06/22/04 1410 -897 64M <0 50 098 <0 50 <1 0 36 <10 <10 <10 4,900 <10 <10 08/12/04 1460 -947 541 081 094 <0 50 <10 14 <0 50 <0 50 <0 50 180 <050 <050 10/21/04 14 79 -966 <50 <0 50 069 060 <10 380 <0 50 <0 50 35 6,500 <0 50 <0 50 01117/05 1370 -857 <50 <0 50 <050 <050 <10 580 <25 <2 5 19 1,400 <25 <2 5 04/18105 1234 721 <50 <0 50 <0 50 <050 <10 540 <50 <5 0 <5 0 1 100 <50 <5 0 ug? Micrograms perkier D1PE Dl isopropyl ether ETBE Ethyl tent-butyl ether MSL Mean sea level TPN Total petroleum hydrocarbons TAME Tort amyl methyl ether bgs Below ground surface NBE Methyl tert-butyl ether TBA Tert butyl alcohol EDB 9,2-Drbromoethane 1,2-DCA 1,2 Dichloromethane t'1 Well casing elevations surveyed by Morrow Surveying on 712102 Rt Sample contained compounds in the gasoline range,but the chromatogram pattern was not consistent w+th the expected pattern N Vmcfpl(ProjectsTroJec1s1880104011A101071200511 Q05k2Q05 As 4 of 4 Shaw Emvroarnental Inc