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w t L <br /> h� <br /> AU O 17 1902 <br /> Engineers P.NVINONIAWA4,_ §= L '# <br /> Planners (, :.: ` <br /> Economists <br /> - Scientists <br /> August b, 1992 <br /> SF031604.P3 <br /> Mr. Michael Collins <br /> Environmental Health Division <br /> San Joaquin County Public Health Services <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Dear Mr. Collins: <br /> Subject: Quarterly Groundwater Quality Monitoring Results for Del Monte Plant 33, <br /> 110 North Filbert Street (Disco Property), Stockton, California <br /> This report presents the analytical results for groundwater monitoring wells located at Del <br /> Monte Plant 33, 110 North Filbert Street (Disco Property) in Stockton, California. <br /> Monitoring wells at Del Monte Plant 33 were sampled on .lune 30, 1992 as part of the <br /> quarterly groundwater quality l'nonitoring program. <br /> PROJECT BACKGROUND <br /> Del Monte's Plant 33 Disco property is located near the intersection of Myrtle Street and <br /> Filbert Street in Stockton, California. Three 10,000-gallon underground gasoline tanks <br /> were used by a previous owner of the property and were removed in 1985. A soil and <br /> groundwater investigation conducted by CH2M HILL in 1991 revealed that gasoline <br /> constituents from the tanks are present in the soil and shallow groundwater. The results of <br /> the soil and groundwater investigation are presented in CH2M HILL's "Remedial <br /> Investigation/Feasibility Study, Disco Tank Site, Stockton, California (February 1992)" <br /> (RI/FS). <br /> The groundwater investigation included the installation of eight monitoring wells (Figure 1) <br /> and revealed that gasoline constituents had migrated from the underground tanks into the <br /> shallow groundwater. The shallow groundwater surface was found to exist at <br /> approximately 75 feet below ground surface within fine sandy silts, clayey silts and sand. <br /> Groundwater was observed to flow northwesterly at a gradient between 0.0005 and 0.0013. <br /> CH241,44fi y q, 1 111 Broadway,Sulte 1200,Oakland,CA 94607-4046 510.25 7.2426 Fax 510.893.8205 <br />