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1 � <br /> • • ao <br /> Environmental Consultants Inc <br /> GEOTECHNICAL ENGINEERING ANIS ENVIRONMENTAL SCIENCES <br /> ProjectNo 58100-06-62 <br /> ' August 22, 1996 <br /> California Department of Transportation <br /> ' District 10 <br /> 1976 Charter Way <br /> Stockton, California 95201 <br /> Attention Mr Salyed Alt <br /> Subject DISTRICT 10 MAINTENANCE STATION <br /> STOCKTON YARD FACILITY <br /> STOCKTON,CALIFORNIA <br /> CONTRACTNO 53W202 <br /> ' TASK ORDER NO 10-911175-A9 <br /> GROUNDWATER MONITORING REPORT- THIRD QUARTER 1996 <br /> ' Dear Mr Ali <br /> In accordance with Caltrans Task Order No 10-911175-A9, dated .lune 26, 1995, Geocon <br /> Environmental Consultants, Inc (Geocon) has performed groundwater monitoring activities at the <br /> above subject site The scope of services provided by Geocon included groundwater level <br /> measurements,the sampling of thirteen monitoring wells, and the submittal of groundwater samples to <br /> a California certified 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 /> 1 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 /> Iconcentrations of 2,000 and 58 milligrams per kilogram, respectively <br /> • <br /> ' 3235 Sunrise Blvd,Suite 6 <br /> Rancho Cordova,CA 95742 <br /> ' (916)852-9118 <br /> Fax(916)852-9132 <br />