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Earth Systems Environmental , Inc. <br /> A Member of The Earih Systems Group <br /> 6701 McDivitt Drive, Suite B • Bakersfield, CA 93313 (805) 836-0901 • FAX (805) 836-0911 <br /> ' November 6, 1992 Doc No 9210-EO55 RPT <br /> Project No EB-8101-3 <br /> ' San Joaquin County Department of <br /> Environmental Health Services <br /> P O Box 2009 <br /> Stockton, California 95201 <br /> Attention Mr Mike Collins <br /> SUBJECT REPORT OF GROUNDWATER CHARACTERIZATION <br /> MORITA BROTHERS SERVICE STATION <br /> 814 EAST CHARTER WAY <br /> STOCKTON,CALIFORNIA <br /> A PN # 167-181-01 <br /> 1 <br /> Reference Work Plan for Groundwater Characterization, Morita Brothers <br /> Service Station (ESE, July 16, 1992) <br /> Reference Soil Characterization Report, Morita Brothers Service Station, <br />' (ESE, May 6, 1992) <br /> Reference Tank Closure Report, Morita Brothers Service Station, <br /> (ESE, January 23, 1992) <br /> 1 .0 INTRODUCTION <br />' This report presents results of a groundwater assessment performed by Earth Systems <br /> Environmental, Inc (ESE) of the groundwater at the above referenced site (Figure 1) <br />' This assessment was performed to assess if and to what extent groundwater has been <br /> impacted due to a release from the former underground gasoline storage tank and <br />' product pipelines at the site Tasks completed to date include the drilling and <br /> completion of three groundwater monitoring wells, chemical analysts of <br /> groundwater samples, data analysis, and preparation of this report of findings The <br /> results of -this initial groundwater- assessment indicate that gasoline hydrocarbons <br /> are present beneath the subject property within a confined perched aquifer at 57 <br />' feet below surface grade However, there are very strong indicators that the <br /> elgasoline hydrocarbons are sourced from off site, and not a result of the release at the <br /> l <br /> Morita Brothers property <br />