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GEOTECHNICAL AND ENVIRONMENTAL CONSULTANTS ®� <br /> Project No 58100-06-62 <br /> November 27, 1996 <br /> ' California Department of Transportation <br /> District 10 <br /> 1976 Charter Way <br /> Stockton, California 95201 <br /> Attention Mr Saiyed Ali <br /> ' Subject SHOP 10 FACILITY <br /> DISTRICT 10 MAINTENANCE STATION <br /> STOCKTON, CALIFORNIA <br /> CONTRACT NO 53W202 <br /> TASK ORDER NO 10-911175-A9 <br />' GROUNDWATER MONITORING REPORT- FOURTH 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, Inc (Geocon) has performed groundwater monitoring activities at the <br />. subject site The scope of services provided by Geocon included groundwater level measurements, <br /> the sampling of twelve monitoring wells, and the submittal of groundwater samples to a California <br /> certified laboratory for analytical testing <br />' BACKGROUND <br /> Site Location <br />' The site consists of the Caltrans Shop 10 Maintenance Station located at 1603 South B Street in <br /> Stockton, California The approximate site location is depicted on the attached Figure 1 <br />' Site Conditions <br />' In February and March 1989, four gasoline/diesel fuel underground storage tanks (USTs) and one <br /> 1,000 gallon waste oil UST were removed Samples collected from beneath the former USTs <br /> indicated the presence of residual total petroleum hydrocarbons as gasoline (TPHg) in soils at <br /> concentrations ranging from 2 2 to 3,700 milligrams per kilogram (mg/kg) <br /> Initial subsurface investigation at the site was performed by Woodward Clyde Consultants (WCC) in <br />' 1987 WCC work included the installation and sampling of four groundwater monitoring wells <br /> (MW-1 through MW-4) Additional investigation was performed between April 1989 and March <br /> 1990 by WCC which consisted of the installation of five additional groundwater monitoring wells <br /> (MW-5 through MW-9) Alton Geoscience (Alton) installed three new groundwater monitoring <br /> 3235 Sunrise Blvd, Suite 6 0 Rancho Cordova, California 95742 11 Telephone (916) 852 9118 0 Fax (916) 852-9132 <br />