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Environmental Consultants Inc a� <br /> GEOTECHNICAL ENGINEERING AND ENVIRONMENTAL SCIENCES <br /> Project No S8100-06-62 <br /> ' June 18, 1996 <br /> California Department of Transportation <br /> ' District 10 <br /> 1976 Charter Way <br /> Stockton, California 95201 <br /> ' Attention Mr Saiyed Ali <br /> ' Subject DISTRICT 10 MAINTENANCE STATION <br /> STOCKTON YARD FACILITY <br /> STOCKTON,CALIFORNIA <br /> CONTRACT NO 53W202 <br /> TASK ORDER NO 10-911175-A9 <br /> GROUNDWATER MONITORING REPORT- SECOND QUARTER 1996 <br /> Dear Mr Ali <br /> In accordance with Caltrans Task Order No 10-911175-A9, dated June 26, 1995, Geocon <br /> Environmental Consultants has performed groundwater monitoring activities at the above subject site <br /> The scope of services provided by Geocon included groundwater level measurements,the sampling of <br /> ' thirteen monitoring wells, and the submittal of groundwater samples to a California certified <br /> laboratory for analytical testing <br /> ' BACKGROUND <br /> Site Location <br /> ' The project site consists of the Caltrans District 10 Stockton Yard facility located at 1604 South B <br /> Street in Stockton, California The 4 acre site is part of Caltrans' District 10 Headquarters complex <br /> ' and is utilized as an equipment maintenance and storage facility The approximate site location is <br /> depicted on Figure I The project boundaries are shown on the Site Plan,Figure 2 <br /> ' Site Conditions <br /> The Stockton Yard was built in approximately 1955 and utilized a fueling station located within the <br /> northwest portion of the site It is understood that one 18,925-liter(5,000-gallon) diesel underground <br /> ' storage tank (UST), one 37,850-liter (10,000-gallon) unleaded gasoline UST, two pump islands and <br /> associated product piping were removed from the site in 1989 Petroleum hydrocarbons were detected <br /> in excavation soil samples indicating that the UST systems had impacted the surrounding soil Total <br /> ' petroleum hydrocarbons as gasoline and diesel (TPHg and TPHd) were reported in soil at <br /> concentrations of 2,000 and 58 milligrams per kilogram,respectively <br /> 3235 Sunrise Blvd Suite 6 <br /> ' Rancho Cordova CA 95742 <br /> (916)852-9118 <br /> Fax(916)852-9132 <br />