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r� rr ■r r r rr rr rr rr rr rr rr rr rr Ta 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 DIPS ETRE TAME TBA 1,2 DCA Identification Sampled MSL feet b s MSL u 0 NO) (ug/1) (ug/1) (ug/1) (ug/1) (Ugill) (U911) jug/]) (ug/1) EDB(ug/1) (ug/1) MW-4 07/29/02 4 BO(al 1328 -848 <50 1 1 <03 <0 3 <06 14,000 <50 88 160 <50 10/07/02 1412 -932 <50 <030 <0 30 <0 30 <0 60 9,600 <50 <50 110 140 01/02/03 1356 -876 <50 33 073 <0 30 1 1 14 000 <50 <50 <50 <50 04/03103 1335 855 <50 <0 50 <050 <050 <1 0 12,000 <5 0 <5 0 200 <50 07/21/03 1393 913 <50 <0 50 <050 <050 <1 0 14,000 <50 <50 250 <50 10/13103 1470 990 <50 <0 50 <050 <0 50 <1 0 9 900 <100 <100 <100 <1000 <100 <100 01/12104 1397 917 <50 28 <0 50 <0 50 <1 0 5,100 <0 50 <0 50 35 5,500 <0 50 <0 50 022104 1376 896 410 43 092 <0 50 <1 0 790 <25 <25 <25 2,800 <25 <25 08112!04 1427 -947 <50 12 <0 50 <050 <10 16 <0 50 <0 50 <0 50 1,100 <0 50 <0 50 10121/04 1451 -971 <50 11 24 <050 <1 0 15 <0 50 <0 50 0 85 1 700 <0 50 <050 01/17105 1342 -862 <50 06 <050 <0 50 <10 1,800 <0 50 <D50 310 <500 <0 50 <0 50 04/18/05 1203 723 95 <0 50 <0 50 <0 50 <10 930 <10 <10 <10 <100 <10 <10 07/18/05 1270 -790 <50 26 <0 50 <0 50 <10 170 <50 <5 0 <5 0 1,300 <5 0 <5 0 10/17/05 1360 - -880 - <50 <0 50 058 <050 <1 0 13 <0 50 <0 5C <0 50 3,300 <050 <050 MW-5 07129102 513 i't 1361 -848 <50 <03 09 <0 3 12 18,000 <25 <25 150 5,700 10107102 1440 927 <50 <0 30 042 <0 30 <0 60 29 000 <250 <250 <250 5,600 01102103 1387 874 <50 <0 30 038 <0 30 <0 60 41,000 <50 <50 230 12 000 04/03/03 1361 -848 <50 <0 50 <0 50 <0 50 <10 29 000 <50 <50 370 540 07/21/03 14 25 912 <50 <0 50 <0 50 <0 50 <10 10,000 <5 0 <5 0 <5 0 41,000 10/13/03 1502 989 <50 <0 50 <0 50 <0 50 <1 0 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 06122104 1410 897 64f�3 <0 50 098 <0 50 <1 0 36 <10 <10 <10 4,900 <10 <10 08112104 1460 947 54121 081 094 <0 50 <10 14 <0 50 <0 50 <050 180 <050 <0 50 10/21/04 1479 -966 <50 <0 50 069 060 <1 0 380 <0 50 <0 50 35 6,500 <0 50 <050 01/17/05 1370 857 F <50 <0 50 <0 50 <0 50 <1 0 580 <25 <2 5 19 1400 <2 5 <25 04/18/05 1234 721 <50 <0 50 <0 50 <0 50 <10 540 <50 <5 0 <50 1,100 <50 <50 07/18/05 1302 789 <50 <0 50 <0 50 <0 50 <10 12 <5 0 <50 <5 0 1,200 <5 0 <50 10/17105 1388 - 875 i <50 <0 50 <0 50 <0 50 <10 2200 <0 50 <0 50 12 350 <0 50 <0 50 I � ugrl Micrograms per liter D1PE Dt isopropyl ether ETBE Ethyl tort butyl ether MSL Mean sea level TPN Tota!petroleum hydrocarbons TAME Teri amyl methyl ether bgs Below ground surface MOE Methyl tert butyl ether TBA Tert butyl alcohol ED8 1,2 Dtbromoethane 12 DCA 12 Dichloromethane ill Well casing elevations surveyed by Morrow Surveying on 712102 R1 Sample contained compounds in the gasoline range but the chromatogram pattern was not consistent Oh the expected pattern Shaw Environmental,Inc N 4TechPubW00401A Arco12005 RpisU414005 Table 1Tabie 1 Page 4 of 4 Rev 0 04104106