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TABLE 2 ANALYTICAL RESULTS GROUNEPWATER SHELL SERVICE STATION 7910 LOWER SACRAMENTO rlana STOCKTON CAuwaNIA (AA rasults In parts-per-md1an) Monitoring Cate Total Petroleum Aromatic Volatile Organics Well Collected Hydrocarbons Gasoline Benzene Toluene Ethyl- Total benzene Xylenes MW-1` 08/15/89 + < 0 0006 < < < 05/11/90 + < 00011 < < < 10/11/90 + < < < < < 02/01/91 + < < < < < 05/08/91 + < < < < < 08/20/91 + < < < < < 11/21/91 + < < < < < 02/20/92++ < < < < < 06/12/92++ — _08/12/92++ < < < < < 11/05/92++ 02/19/93.++ < < < < < MW-2 08/15/89 + < < < < < 05/11/90 + < < < < < 10/11/90 + < < < < < 02/01/91 + < < < < < 05/08/91 + < < < < < 08/20/91 + < < < < < 11/21/91 + < < < < < 02/20/92++ < < < < < 06/12/92++ < < < < 00019 08/12/92++ < < < < < 11/05/92++ < < < < < 02/19/93+++ < < < < < MW-3' 08/15/89 + < < < < < 05/11/90 + < < < < < 10/11/90 + < < < < < 02/01/91 + < < < < < 05/08/91 + < < < < < 08/20/91 + < < < < < 11/21/91 + < < < < < 02/20/92++ < < < < < 06/12/92++ 08/12/92++ < < < < < 11/05/92++ --- - - 02/19/93+++ < < < < < MW-30 02/19/93+++ < < < < < (Cup`) i jNOTES = Below Practicai Quantitation Reporting Limits per 'Tri-Regionai Board Staff Recommendations for Preliminary Evaluation and Investigation of Underground Tank Sites (August 10 1990) (PQL for STEX.0 0005 ppm TPH as gasoline and diesel-0 05 ppm) + Sampled by pelta Environmental Consultants Inc of Rancho Cordova California ++ Sampled by Emcon Associates of Sacramento California +++ a Sampled by Blaine Tech Services Inc of San Jose California = Wells MW t and MW 3 are sampled semiannualty Not sampled due to change from quarterly to semiannually D = Duplicate sample Aegis Environmental Inc 91 233/Api-0 9 1993