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TABLE 2 (CONTINUED) ANALYTICAL RESULTS GROUNDWATER SHELL SERVICE STATION 620 WEST CHARTER WAY, STOCKTON,CAI IFORNIA (All results in paris-per-rnllion) Monitoring pate Total Petroleum Aromatic Volatile Organics Well Collected Hydrocarbons Gasoline Benzene Toluene Ethyl- Total benzene Xylenes MW-4 12/18/89 25 0 025 0 004 < 0 070 03/28/90 100 0 290 0 270 00015 0 290 07/31/90 FLH FLH FLH FLH FLH 10/24/90 FLH FLH FLH FLH FLH 01/31/91 FLH FLH FLH FLH FLH 04/26/91 FLH FLH FLH FLH FLH 07/23/91 FLH FLH FLH FLH FLH 10/30/91 FLH FLH FLH FLH FLH 01/28/92 FLH FLH FLH FLH FLH 04/30/92 FLH FLH FLH FLH FLH 07/10/92 FLH FLH FLH FLH FLH MW-5 01/10/90 0 100 < < < 000051 03/28/90 16 00033 0 012 00012 0 019 07/31/90 1 4 0 150 0 020 0 043 0 039 10/24/90 086 0 220 0 022 0 038 0 036 01/31/91 140 11 52 1 9 74 04/26/91 67 30 0 050 018 Oil 07/23/91 22 89 09 069 09 10/30/91 19 38 023 027 050 01/28/92 34 92 044 083 12 04/30/92 23 81 035 0 76 1 3 07/10/92 25 92 11 1 0 1 9 MW-6 01/10/90 < < < < < 03/28/90 < < < < < 07/31/90 < < < < < 10/24/90 < < < < < 01/31/91 < < < < < 04/26/91 < < < < < 07/23/91 < <0 12 < <0 0011 < <0 0087 <<0 0029 < <0 018 10/30/91 < < < < < 01/28/92 < < < < < 04/30/92 < 000040 < < < 07/10/92 < < < < < MW-6D 07/10/92 < < < < < NOTES --- = Not analyzed FLH = Floating liquid hydrocarbons < = Below Practical Quantitation Reporting Limits per Tri-Regional Board Staff Recommendations for Preliminary Evaluation and Investigation of Underground Tank Sites (August 10, 1990) (PQL for BTEX = 0 0005 ppm, TPH, as gasoline and diesel = 0 05 ppm) < < = Below the indicated detection limit labeled in the analytical laboratory results reports NA = Not applicable NS _ Not sampled NR Not requested D = Duplicate sample Aegis Environmental Inc 91 246/5eptember 1 1992