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r <br /> EXPLANATION <br /> – – —PROPERTY BOUNDARY <br /> NORTHGATE DRIVE <br /> �- GROUNDWATER MONITORING WELL <br /> E2–W-13 SAMPLE LOCATION, IDENTIFICATION <br /> • AND DEPTH BGS <br /> –+ B BENZENE CONCENTRATON IN pg/L <br /> MW-5 – I – \ TPH–G TOTAL PETROLEUM–AS--GASOLINE <br /> PLANTER r� PLANTER CONCENTRATION IN tug/L <br /> I ` MTBE METHYL–TERT–BUTYL–ETHER <br /> I CONCENTRATION IN fag/L <br /> DO DISSOLVED OXYGEN <br /> CONCENTRATION IN mg/L <br /> i CANOPY <br /> i ( ) POTENTIOMETRIC SURFACE ELEVATION <br /> FEET ABOVE SEA LEVEL <br /> MW-4 <br /> * DATA NOT USED IN CONTOURING <br /> > >I $0 DEEP WELL <br /> I <br /> __ _ MW-1 (17 82) / POTENTIOMETRIC SURFACE CONTOUR <br /> MW-2 (17 80) T3-N 15�- T1`N_15 8-90 4 CONTOUR INTERVAL 02 FEET <br /> 8=315 , TPH-G=2 860 <br /> I TPH-G=38,400 Ek ! E MTBE-38 { <br /> MTBE=254 ! t I <br /> DO=O 4 1 1 11 i DO=O 6 GROUNDWATER Flow DIRECTION <br /> T3-SF 15• 1 I 1 !�� ! MW-IA (17 64)• <br /> -^- B <br /> 1 = G3<so PROPOSED MONITORING WELL <br /> I LOCATION OF 0,00,11 i _ <br /> FORMER USTs , 1 1 1 1 MTBE=5 38 <br /> T2-5-11 11 i-S-15 DO=1 2 <br /> SIDEWALK 3 <br /> I-- 11_– _I H- v SOIL BORING LOCATION <br /> I w <br /> E2-E-13 <br /> E2-W-13 <br /> (n <br /> • 2� I <br /> I <br /> LOCATION OF <br /> I a N <br /> EXISTING USTs Ei-W IS E1-C-13 1 <br /> E1-E-15 <br /> Z <br /> 7—ELEVEN <br /> STORE 0 20 40 <br /> #19976 IMP<03 3( <br /> 1785) SCALE FEET <br /> t MTBE G<5 50 <br /> DO=O 8 ( SOUTHLAND CORPORATION <br /> 7-ELEVEN FACILITY NO 19976 <br /> I 1399 N MAIN STREET <br /> MANTECA, CALIFORNIA <br /> 103998 <br /> – – – – – – – – – PLANTER – – – – – DRAWN BY ea DATE 01-21-99 <br /> DRAFTED 8Y JP DATE 01-24-9 <br /> CHECKED BY DATE L <br /> POTENTIOMETRIC SURFACE AND <br /> DISSOLVED HYDROCARBON <br /> CONCENTRATION MAP <br /> {12/30/98) <br /> IT CORPORATION k <br /> PSD�ti29s 1 � FIGURE 2 <br /> I <br />