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Table 4 Historical Groundwater Analytical Data-SVOCs South Shore Parcels-Parcel 2A and Adjacent Areas West Weber Avenue and North Lincoln Street Stockton,California Analyzed by EPA Method 8270 Benzo- Benzo- Benzo- Benzo- Ideno- 1-methyl- 2-methyl- Bis(2-ethyl- 2,4-Di- 3/4- Anth- (a)anth- (b)fluor- (k)fluor- Benzo(a)- (g,h,i) Chry- Fluor- Fluor- (1,2,3-c,d)- naph- naph- Naph- Phen- hexyl)- 2-methyl- methyl- methyl- Diethyl Other Sample Date racene racene anthene anthene pyrene perylene sene anthene ene pyrene thalene thalene thalene anthrene Pyrene phthalate Phenol phenol phenol phthalate SVOCs ID (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) Explanation(cont.): =Other unspecified SVOCs were tabulated in Treadwell&Rollo's Volume ll, =Phenol detected at 0.063 mg/1. 36= Matrix Spike/Matrix Spike Duplicate results for Chlorobenzene were outside of control limits. 2=Collected by Clayton Group Associates. 3- This may indicate a bias for the sample that was spiked. Since the LCS recoveries were within -Phenol detected at 0.057 mg/1. control limits,no data are flagged. 4=Phenol detected at 0.037 mg/1. 6=Phenol detected at 0.025 mg/1. 37=Matrix Spike/Matrix Spike Duplicate results were affected by the analyte concentrations 6=Surrogate spike compound(p-Terphenyl-d14)was out of control due to matrix interference. The already present in the un-spiked sample. associated method blank surrogate spike compound was in control and,therefore,the sample data sa=Wallace-Kuhl did not sample due to ongoing negotiations with the City and the Regional Board. was reported without further clarification. 3s=Dimethyl Phthalate detected at 0.013 mg/1. 7=Surrogate spike compound(2-Fluorobiphenyl)was out of control due to matrix interference. The 41=Dimethyl Phthalate detected at 0.022 mg/1. associated method blank surrogate spike compound was in control and,therefore,the sample data 41=Benzoic Acid detected at 4.1 mg/1. was reported without further clarification. 42=Wells destroyed in November 2008 as part of the Unocal excavation activities by Treadwell and Rollo. a=Surrogate spike compound(Phenol-d6)was out of control due to matrix interference. The 41=2,6-Dinitrotoluene detected at 0.018 mg/1. associated method blank surrogate spike compound was in control and,therefore,the sample data 44=Phenol detected at 0.042 mg/1. was reported without further clarification. 46=Phenol detected at 0.013 mg/1. '=Samples collected by Clayton Group Services. 46=SVOC sample bottles arrived broken to the laboratory;therefore,SVOCs were not analyzed. 10=Phenol detected at 0.089 mg/1. 47=Hexachloroethane detected at 0.024 mg/I. 11=Phenol detected at 0.014 mg/1. 12=Bis(2-Chloroethyl)Ether detected at 0.024 mg/1. 13=Phenol detected at 0.012 mg/1. 14=Phenol detected at 0.180 mg/1. 15=Phenol detected at 0.025 mg/1. 16=Date sample was prepared. 17=The analyte concentration was reported from analysis of the diluted sample. s=Dilution factor of 10. 19=Phenol detected at 0.057 mg/1. 20=Phenol detected at 0.087 mg/1. 21=Phenol detected at 0.024 mg/1. 22=The relative standard deviation of the calibration curve response factors exceeds the control limit for the analyte 2-Naphthylamine. 23=The relative standard deviation of the calibration curve response factors exceeds the control limit for the anal 24=The Continuing Calibration Verification(CCV)recovery is not within established control limits for the analyte 21=The Continuing Calibration Verification(CCV)recovery is not within established control limits for the analyte N-Nitrosodimethylamine. 26=Phenol detected at 0.018 mg/1. 27=Collected by Wallace Kuhl. 2E=Phenol detected at 0.039 mg/1. 29=Phenol detected at 0.034 mg/I. 30=Phenol detected at 0.045 mg/1. 31=Di-n-Octyl Phthalate detected at 0.11 mg/I. 32=Di-n-Octyl Phthalate detected at 0.022 mg/1. a3=Phenol detected at 0.016 mg/I. 34=4-Chlorophenyl-phenyl ether detected at 0.012 mg/1. as =Phenol detected at 0.011 mg/I. Stantec 20120924-Parcel2A(Tables 4,5,6,7)Historical GW Tables 3412-CL.xlsx Page 53 of 53