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i i i � i � � ■� i i i i ti i i i Benzene 405 Benzene 1,500 Toluene 405 Toluene 830 CHATEAUMW11 Ethylbenzene <05 Ethylbenzene 560 HOSPITAL (oat rotated to scare) Xylenes <06 Xylenes 1,690 Benzene <0 5 Benzene <0 5 NM TPH-9 110 TPH-g 13,000 Toluene 31 Toluene <0 5 ( ) MTBE(6021) 17 MTBE(8021) 412 Benzene 38 Ethylbenzene 20 Ethylbenzene <0 5 Z MTBE(8260) 19 Toluene 53 Xylenes 346 Xylenes <0 5 PROFESSIONAL REALTOR MW9 BUILDING Ethylbenzene 6 TPH-g 1,500 TPH-g 450 MW13 (-9 57) Xylenes 307 MTBE(8021) 30 MTBE(8021) 12 Benzene 78 Benzene 11,000 TPR9 1,200 MTBE(8260) <5 MTBE(8260) <5 {nal located to scale) Benzene <0 5 Toluene 9 9 Ethylbenzene Toluene 14 ODOMTBE(8021) 1g (-1120} Toluene <0 5 Ethylbenzene 43 Xylenes 19,900,000 MTBE(8260) <5 Benzene <0 5 Benzene <0 5 Ethylbenzene <05 Xylenes 403 TPH-g 140,000 Toluene <0 5 Toluene <0 5 Xylenes <05 TP" 3,700 MTBE(8021) 4120 MW10 Ethylbenzens <0 5 Ethylbenzene <0 5 TPH-g 200 MTBE(8021) 24 ROS IE LANE (-1063) Xylenes <0 5 Xylenes m 5 MTBE(8021) 30 MTBE(8260) <5 LPH 0 02 ft TPH-g <50 TPH-g <50 MTBE(8260) 32 MTBE(8021) <0 5 MTBE(6021) <0 5 Benzene <0 5PSV1 -10181 RW2 Toluene <0 5 UVB-MW2 V3 RW4 MW12 Ethylbenzene 15 MW4 (-991) UVB (shallow) (-1044) (-10 47) (-9 870 Xylenes 06 , (4364) ♦ UVB-MW1(deep)(-1021)• TPH-Q 800 1 `Pi V1 SW2 MW6(-5 24)" Benzene 3 6 MTBE(8021) 57 I (NM) MW2 ___ (-1001) (NM) Benzene <0 5 Toluene 0 81 Toluene 056 N MTBE 8260 <5 I (-966) 1 SW1 I O Ethylbertzene i 3 t V4 (NMi+ ♦ 0 PSV2 Ethylbenzene <0 5 Xylenes 2 51 Toluene B1 (-961) (-9 74) ( (-10 QO} Xylenes H-g <<0 5 TPH� 350 Ethylbenzene 240 • P2 I FD KR I MW3 MTBE 8021 <0 5 MTBE(8021) 5 4 0 30 BO Xylenes 560 (NM) j_FI -----i(-9 88} RW i MTBE(8260) <5 TPH-g 5,700 I (10 00� LPH 0 02 ft Scale(feat) LU MTBE(8021) 17 rel rel I LEGEND MTBE(826X222 MW7 I I I I I Benzene 130 � GROUNDWATER MONITORING WELL 9 4B I Toluene 300 • PIEZOMETER O ) Q (- ) I FORM R MWS IEthylbenzens 530_ Q FORMER ISTATIN (-S� , Xylenes 1,450 VAPOR EXTRACTION WELL V` BUILIG(a v7Z MW1 PUMP TPH 17,000 Benzen _ (-943) ISLANDS i iI--I ( MTBE 24 RECOVERY WELL Toluene <0 5 I I I_ MTBE(8260) <5 O PERMANENT SOIL VAPOR MONITORING WELL Ethylbenzerre 405' d I----- ' � ♦ AIR SPARGINGWELL Xylenes <0 5 LPH 0 02 ft Benzene <0 5 TPH-g <50 I M FORMER Toluene <0 5 fk INJECTION WELL MTBE(8021) <0 5 Benzene <0 5 —-- --—--—--– __J USED Ethylbenzene <0 5 (-961) Groundwater Elevation(ft mal) O Toluene <0 5 OIL TANK Xylenes 0 64 E Z EthAbenzene <0 5 Benzene <0 5 Benzene <0 5 TPH-g — " Not Used to Determine Gradlent Xylenes <0 5 Toluene <0 5 Toluene <0 5 MBE(8021) <0 5 TPH-g <50 (NM) Not Measured MTBE(8021) <0 5 Ethylbenzenegenes <0 5 Ethytbe zenetens 40 5 TPH-g Total Petroleum Hydrocarbons as Gasoline Groundwater xylenes <0 5 xylenes <0 5 MTBE Methyl t-Butyl Ether GW Flow Direction TPH-g 81 TPH-g 160 MTBE(8021) 12 MTBE(8021) 29 LPH Liquid Phase Hydrocarbons(feet) Gradient = d 003 to D 006 MTBE(82fi0) <5 MTBE(8260) <5 Analytical results In micrograms per liter (ug/L) I SITE MAP SHOWING GROUNDWATER SAMPLE ANALYTICAL RESULTS FIGURE JIF NETIC ' FORMER ON RS 7-3942 4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA Engineenng,Inc 21 JUNE 2001 4