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�UVVG�� <br /> • . QL__J <br /> Environmental Consultants Inc <br /> GEOTECHNICAL ENGINEERING AND ENVIRONMENTAL SCIENCES <br /> Project No 58100-06-18 <br /> June 21, 1995 <br /> VIA OVERNIGHT DELIVERY <br /> Mr Saiyed S Ali <br /> Hazardous Waste Coordinator Z <br /> California Department of Transportation <br /> District 10 <br /> 1976 Charter Way <br /> Stockton, California 95201 <br /> Subject CALTRANS SHOP - 10 <br /> STOCKTON, CALIFORNIA <br /> CONTRACT NO 53W202 <br /> TASK ORDER 10-5F1000-05 <br /> SITE ASSESSMENT WORKPLAN <br /> SDear Mr Ali <br /> In accordance with Caltrans Contract No 53W202 and Task Order No 10-5FI000-05, Geocon <br /> Environmental Consultants is submitting this Workplan for site assessment work to be conducted <br /> at the above referenced project site This Workplan describes the scope of work requested by <br /> Caltrans and outlines procedures and methods to be employed by Geocon to complete the project <br /> For budgeting purposes, the scope of work requested by Caltrans has been segregated into two <br /> phases Phase 1 work includes restoring groundwater sampling capability for seven existing <br /> groundwater monitoring wells that were temporarily decommissioned, installing a new combination <br /> groundwater monitoring/vapor extraction test well and performing a groundwater monitoring event <br /> for all pre-existing, restored and the new well Phase 2 work includes the installation of two vapor <br /> extraction test monitoring wells,the performance of a vapor extraction pilot test and the preparation <br /> of a final report presenting the results of the Phase 1 and 2 work performed <br /> BACKGROUND <br /> The location of Caltrans Shop 10 is depicted on Figure 1, Vicinity Map Initial subsurface <br /> investigation at the site was performed by Woodward Clyde Consultants (WCC) in 1987 WCC <br /> work included the installation and sampling of four groundwater monitoring wells (MW-1 through <br /> MW-4) in the vicinity of four existing 5,000 gallon underground gasoline/diesel fuel storage tanks <br /> (USTs) Sample results indicated that groundwater beneath the USTs was impacted with total <br /> petroleum hydrocarbons as gasoline (TPHg) and benzene at concentrations ranging from 154 to 231 <br /> mg/1 for TPHg and ranging from 14 7 to 25 7 mgll for benzene In February and March 1989, the <br /> . four gasoline/diesel fuel USTs and one 1,000 gallon waste oil UST were removed from service by <br /> 3235 Sunrise Blvd Suite 6 <br /> Rancho Cordova,CA 95742 <br /> Ps(852 9118 <br /> ax916)852 9132 Gad r } <br /> z <br />