Laserfiche WebLink
Stantec <br /> April 30, 2010 <br /> Page 3 of 6 <br /> Reference: First Quarter 2010 Site Status, Groundwater Monitoring and Remedial Summary Report-Stockton Terminals Technical Committee <br /> Facilities <br /> Appendix D-Analytical Program Description, Field Data Sheets, Groundwater Certified Laboratory Analytical Reports,and Chain-of- <br /> Custody Documentation <br /> Table D-1 <br /> First Quarter 2010 <br /> Number of <br /> Wells at or Number of Percent <br /> below the Wells with Maximum Decrease <br /> Number WQO Detections Concentration Average Median Maximum Detected from <br /> Detected of Wells and/or above the Detected in pg/L Concentration Concentration Historical Maximum <br /> Constituents Analyzed MRL WQO (Well ID) (Ng/L) (Ng/L) Concentration Historical <br /> Bold Concentrations below WQO or MRL (Well/Date) Concentration <br /> "A"Zone <br /> TPHg 44 17 27 94,000 15,717 1,055 290,000 68 <br /> (AR/MW-8A) (TS-4/2002) <br /> TPHd 44 25 19 210,000 11,147 680 1,800,000 88 <br /> (AR/MW-10A) (TS/M-2/May 2009)" <br /> Benzene 44 19 25 8,000 1,032 123 45,000 82 <br /> (TO/T-2) TO/MW-1 /1993 <br /> Toluene 44 31 13 9,000 649 1.4 22,000 59 <br /> (AR/MW-8A) (AR/MW-8A/2003) <br /> Ethylbenzene 44 29 15 3,300(AR/MW 8A) 551 2.2 (AR/MW-23A/ 2008)700 97 <br /> Xylenes 44 30 14 17,000 2,526 23 28,000 39 <br /> (AR/MW-24A) (TO/R-8/2002) <br /> MTBE 44 26 18 9,700 655 3.8 290,000 97 <br /> AR/MW-50 AR/MW-5A/1999 <br /> TBA 34^ 17 17 7,800 418 23.5 11,000 29 <br /> (AR/MW-50) (AR/MW-11A/2006) <br /> TAME 23^ 16 7 91(AR/MW-50) 13 <4.0 (AR/MW-5A/2002)820 89 <br /> MBAS' 16 10 6 780 383 380 2,000 61 <br /> (AR/MW-5A) I (AR/MW-5A/2009) <br /> Definitions. WQO=Water Quality Objective MBAS=Methylene blue active substances <br /> MRL=Method Reporting Limit Median=the middle number in a sequence of TBA=Tertiary butyl alcohol <br /> pg/L=Micrograms per Liter numbers TAME=Tertiary amyl methyl ether <br /> ^ =In compliance with MRP . =Requested by the RWQCB beginning in 2009 <br /> WQOs <br /> Unless otherwise noted,WQOs from Appendix A-Reports, Tri- TPHg(21 pg/L) Ethylbenzene(300 tag/L) TBA(12 pg/L) <br /> Regional Board Staff Recommendations for Preliminary TPHd(100 tag/L) Xylenes(1,750 pg/L) TAME(no WQO provided, MRL used) <br /> Investigation and Evaluation of Underground Tank Sites, Benzene(1 pg/L) MTBE(5 pg/L) MBAS(500 pg/L,Secondary MCL) <br /> RWQCB,April 16,2004. Toluene(150 pg/L) DIPE(0.80 pg/L) <br />