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Table A-Summary of Degradation Rate Calculations
<br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California
<br /> Maximum Current
<br /> Concentration Concentration Half-Life Date to Reach Years to reach
<br /> Well Analyte (pg/L) (py/L) (yeara) WQO WQO
<br /> MW-15 TPHd 290,000 5,780 437 Dec-28 17
<br /> TPHg 840,000 3,000 413 May 2024 12
<br /> Benzene 1,240 4.2 1.58 Oct 2003 WQO met
<br /> MTBE 512 38.1 NA Below WQO WQO met
<br /> TBA 130 <10 NA Below WQO WQO met
<br /> MW-16 TPHd 160,000 4,710 5.72 Oct-34 23
<br /> TPHg 99,000 7,400 20.55 Mar 2115 103
<br /> Benzene 13,000 698.0 4.45 Jul 2026 14
<br /> MTBE 159 <0.50 NA Below WQO WQO met
<br /> TBA 320 40 NA Below WQO WQOmet
<br /> MW-18 TPHd 7,100 2,100 19.40 Sep-41 32
<br /> TPHg 3,650 520 9.48 Mar 2003 0
<br /> Benzene 23 0.91 NA mow WQO WQO met
<br /> MTBE 0.27a Q.0 NA NA WQO met
<br /> TBA 56 56 NA Below WQO Stable tread
<br /> MW-19 TPHd 13,000 <49 NA Below WQO Below WQO
<br /> TPHg 700 <50 NA Only tour detections above WQO
<br /> Benzene 17 6.1 NA Only four detections above WQO
<br /> MTBE Not enough recent data to graph
<br /> TEA Not enough recent data to graph
<br /> MW-20 TPHd 4,100 1,280 9.58 Jan-26 14
<br /> TPHg 10,000 2,500 6.81 Feb 2030 18
<br /> Benzene 21500 87 3.37 Mar 2012 0
<br /> MTBE 5,520 104 2.12 Aug 2000 WQO met
<br /> TBA 15,000 <10 3.37 Below WQO WQO met
<br /> MW-21 TPHd 3,500 250 4.% Jun-05 0
<br /> TPHg 11,000 450 5.50 Mar 7011 0
<br /> Benzene 2,800 13 1.93 Dec 1998 WQO met
<br /> MTBE 1,480 56 NA Below WQO WQOmet
<br /> TBA 3,400 940 NA Below WQO WQO met
<br /> MW-22 TPHd 25,000 2,030 8.41 Jan-33 21
<br /> TPHg 66,000 3,900 7.68 Mar 2041 29
<br /> Benzene 10,000 7.36 2.65 Aug 2007 WQOmet
<br /> MTBE 770 426 NA Below WQO WQO met
<br /> TBA 2,300 1,200 NA Below WQO WQO met
<br /> MW-23 TPHd 56,000 440p 4.63 Mar-16 4
<br /> TPHg 29,000 94 2.43 Dec 2008 W(O met
<br /> Benzene 4,400 <0.5 NA Below WQO WQOmet
<br /> MTBE 28 3.2 Below WQO Below WQO WQO met
<br /> TBA 470 11 NA Below WQO WQO met
<br /> MW-24 TPHd 57,000 4,180 11.09 Dec-V 36
<br /> TPHg 5,950,000 14,000 6.90 Apr 2052 40
<br /> Benzene 15,000 3,170 34.94 Jun 2235 233
<br /> MTBE 14,000 89 1.20 Feb 2005 WOO met
<br /> TBA 44,30E <10 1.56 Feb 2001 WQO met
<br /> MW-25 TPHd 358 274 48.03 Apr-44 0
<br /> TPHg 140 450 Not graphed
<br /> Benzene 6
<br /> <0.5 Not graphed
<br /> MTBE 34 0.82 NA Below WQO WQO met
<br /> TBA 91 125 NA Below WQO Stable mend
<br /> MW-29 TPHd. 740 180 5-22 Avg-07 WQOmet
<br /> TPHg 4,100 500 5.73 Aug 2016 4
<br /> Bevzne 950 6 1.97 jun 2006 WQO met
<br /> MTBE 0.87 a Q.0 Not graphed
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