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Environmental Consultants Inc a� <br /> ' GEOTECHNICAL ENGINEERING AND ENVIRONMENTAL SCIENCES <br /> ' <br /> Project No S8100-06-11 <br /> March 29, 1995 <br /> California Department of Transportation <br /> District 10 <br /> P O Box 2048 <br /> ' Stockton, California 95201 <br /> Attention Mr Saiyed Ah <br /> ' Contract Manager <br /> Subject 1604 SOUTH B STREET <br /> ' CALTRANS STOCKTON YARD MAINTENANCE FACILITY <br /> STOCKTON, CALIFORNIA <br /> CONTRACT NO 53W202 <br /> TASK ORDER NO 10-5171000-01 <br /> GROUNDWATER MONITORING SUMMARY REPORT - <br /> FIRST QUARTER 1995 <br /> Dear Mr Alt <br /> ' In accordance with Caltrans Contract No 53W202 and Task Order No 10-5F1000-01, Geocon <br /> Environmental Consultants has performed groundwater monitoring services at the subject site <br /> The project site is located within the Caltrans Stockton Yard Maintenance Facility at 1604 South <br /> B Street in Stockton, California (see Vicinity Map, Figure 1) <br /> BACKGROUND INFORMATION <br /> It is reported by Caltrans that one 5,000 gallon diesel underground storage tank UST and on <br /> g g (UST) e <br /> 10,000 gallon unleaded gasoline UST and two pump islands were previously located at the site <br /> for use in fueling Caltrans vehicles The USTs, pump islands, and associated piping were <br /> removed in 1989 Soil samples obtained from the UST excavation indicated the presence of total <br /> petroleum hydrocarbon as gasoline and diesel (TPHg and TPHd) and benzene, toluene, <br />' ethylbenzene and total xylenes (BTEX) The purpose of the scope of services performed by <br /> Geocon was to evaluate the groundwater conditions for the potential presence of petroleum <br /> hydrocarbon impacts and to determine the groundwater gradient and flow direction in the vicinity <br /> of the site <br /> 3235 Sunrise Blvd Suite 6 <br /> Rancho Cordova CA 95742 <br />' (916)852 9118 <br /> Fax(916)852 9132 <br />