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• A0 S <br /> ANALYTICAL RESULTS GROUNDWATER <br /> SHELL SERVICE STATION 6131 PACIFIC AVENUE STOCKTON CALIFORNIA <br /> (AIL hydrocarbon resol15 in partsper-billion) <br /> Total Aromatic Volatile Organics <br /> Monitoring Date Petroleum Total Total Fecal <br /> Well Collected Hydrocarbons Lead Collform Coliform <br /> (MPN/100ml) (MPN/100ml) <br /> Gasoline <br /> Benzene Toluene Ethyl Total <br /> benzene Xylenes <br /> MW-1 07/23/90 350 19 1 5 06 20 5 <<2 <br /> 10/09/90 < 08 < < < 5 13 <<2 <br /> 01/10/90 70 09 < < < 136 Neg <br /> 04/09/91 < < < < < «10 «10 <br /> 07/17/91 130 f 0 < < < - 23 23 <br /> 10/08/91 160* 16 < < < 9 2 92 <br /> 02/26/92** 430 83 2 6 06 1 4 <<2 <<2 <br /> 05/12/92** 90 50 < < 06 7 0 <<3 8 <br /> 07/08/92** 53 59 052 < 089 <<3 6 «3 8 <br /> 10/15/92 76 56 068 < < <<3 8 <<3 8 <br /> 01/11/93*** 98 33 < < < <<2 0 <br /> MW 1D 01/11/93*** 100 21 < < < <br /> ("MW 4") <br /> MW 2 07/23/90 1,900 44 0 420 71 210 33 <<2 <br /> 10/09/90 570 780 430 < 270 «0 002 21 <<2 <br /> 01/10/90 1,200 3600 75 0 < 530 <<2 2 Neg <br /> 04/09/91 4,500 1,200 0 1000 120 2100 1 1 1 1 <br /> 07/17/91 7,200 3,6000 4400 1400 7100 >23 >23 <br /> 10/08/91 10,000 7,6000 3500 2600 6000 120 120 <br /> 02/26/92** 17,000 7,4000 2200 3200 1,3000 <<2 <<2 <br /> I <br /> 05/12/92** 71 26 0 < 085 24 <<1 <<3 8 <br /> 07/08/92** 4 900 1 6000 < 600 2100 <<3 8 <<3 8 <br /> 10/15/92 2 500 94 3 0 42 94 <<3 8 <<3 8 <br /> 01/11/93*** 290 28 < 63 < «20 -- <br /> NOTES = Not analyzed <br /> < = I ess than Practical Quantitation Reporting limits stated in the August 10 1990 Tri Regional Board <br /> Staff Recommendationsfor Preliminary Evaluation and Investigation of Underground Tank Sites' (50ppb for TPH <br /> tl 5 ppb for BTEX) <br /> MPN/100m1 = Most Probable Number(MPN)of bacteria per one hundred milliliters <br /> << Less than the indicated detectlon limit <br /> Positive response for petroleum h/drocarbons as gasoline is due to the presence of an unknown hydrocarbon not gasoline <br /> Data collected by Emcon Associates of Sacramento California <br /> Bata collected by Blaine Tech Services W of San Jose California <br /> D - Duplicate sample <br /> Aegis Environmental Inc <br /> 90 020/March 10 1993 <br />