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I 1 FIGURE 5-4 HISTORICALTRENDS IN TPHg AND BENZENE CONCENCRATIONS AND GROUNDWATER ELEVATIONS IN WELLS MW-1, MW-6, VW-1, and VW-2 SHOP 10 MAINTENANCE STATION STOCKTON, CALIFORNIA Historical Trends in TPHg and Benzene Concentrations o TPH-G (pg/1) Historical Trends in TPHg and Benzene Concentrations o TPH-G (pg/1) ' and Groundwater Elevations in Well MW-13 A Benzene (pgA) and Groundwater Elevations in Well MW-14 ° Benzene (pgA) Groundwater Elevation i -, Groundwater Elevation Linear(Groundwater Elevation -- Linear(Groundwater Elevation Linear(TPH-G (pg/l)) Linear(TPH-G (pgA)) 1 .-. 10000 Linear(Benzene (pg/1)) I Linear(Benzene (pg/1)) 10000 000 c 8000 -10 00 8000 -10 00 1 -20 00 g 6000 0 6000 5 -2000 4000 t _ -�� =j -30 00 � a' 4000 __��-- r -3000 1 0 2000 ° -40 00 U 2000 f -- - -4000 U p 0 0 -5000 0 -5000 Jan-93 Jun-94 Oct-95 Mar-97 Jul-98 Dec-99 Jan-93 Jun-94 Oct-95 Mar-97 Jul-98 Dec-99 ! ti ' Historical Trends in TPHg and Benzene Concentratio o TPH-G (pgA)for VM-1 Historical Trends in TPHg and Benzene Concentration o TPH-G (pg/1)for VM-2 - and Groundwater Elevations in Well VM-1 ° Benzene (pgA) for VM-1 and Groundwater Elevations m Well VM-2 ° Benzene (pgA)for VM-2 D Groundwater Elevation for MW-14 3 Groundwater Elevation for MW 14 —Linear(Groundwater Elevation for MW-14) Linear(Groundwater Elevation for MW-14) ' —Linear(TPH-G (pgA)for VM-1) —Linear(TPH-G (pgA)for VM-2) —Linear(Benzene (pg/1) for VIVA) Linear(Benzene (pgA)for VM-2) 45,000' 000 0 75,000 0 000 40,000 70,000 - -5 00 65,000 35,000 -10 00 60,000 ( -1000 55,000 y 30,040 a' 50,000 I c45,000 1 -15 00 0 25,000 0 -20 OQ O 40,000 ' 20,000 35,000 1 -2000 30,000 - A I -25 00 e 15,000 0 Li 25,000 ' U10,000 -30 00 C] 20,000 I -3000 � 15,000 � n---- # ° -3500 5,000 10,000 ' 5,000 p A -40 00 0 -4000 Mar-97 Jul-98 Dec-99 Mar-97 Jul-98 Dec-99 s Page 1 of 1 file T 11999141-04010004-stocktonlstocktonyardlshoplOGWsummary\Trends 1