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� ECOR 1 0 INTRODUCTION AND BACKGROUND This report has been prepared by SECOR international Incorporated (SECOR) to present the results of third quarter 2005 groundwater monitoring and air sparge/soil vapor extraction treatment system (ASISVETS) start-up at the Caltrans Shop 10 Maintenance Station located at 1603 South B Street in Stockton, California The work was performed in general conformance with the SECOR work plan entitled, "Air Sparge/Soil Vapor Extraction Treatment System (ASISVETS) Installation, Quarterly Groundwater Monitoring and Reporting, Caltrans Shop 10 Maintenance Station, 1603 South B Street In Stockton, California," dated May 24, 2005, (Work Plan) and the most current SECOR Health & Safety Plan (HASP) This report was prepared in accordance with Caltrans Contract 43A0148, Task Order No 06-43AO148-02 1 1 Project Location and History The Caltrans Shop 10 Maintenance Station (Site) Is located at 1603 South B Street adjacent to the District Office located at 1976 E Charter Way at the corner of Charter Way and B Street in the City of Stockton, California (Figure 1) The Site occupies approximately four acres including a two-story office building and temporary permit building, parts warehouse, and maintenance shop (Shop 10) Outside areas for truck washing and water treatment, machining, and highway maintenance equipment storage exist in the southwestern portion of the property (Figure 2) Several underground storage tanks (USTs) were previously removed and monitoring wells have been installed and are currently in use at the Site to monitor groundwater quality The property is owned by Caltrans and is used for the storage and maintenance of state vehicles and highway maintenance equipment In 1978, one 5,000-gallon UST with unknown contents was reportedly removed from the Site due to a detected leak In 1989, three 5,000-gallon gasoline LISTS, one 5,000-gallon diesel UST, and one 1,000-gallon waste oil UST were removed from the Site Between 1987 and 1996, twenty-five groundwater monitoring wells and two vapor extraction wells were installed at the Site to assess the vertical and lateral extent of contamination Thirteen of the monitoring wells were destroyed and the remaining twelve groundwater wells are currently included in the quarterly monitoring program The Site has been on a quarterly groundwater monitoring schedule since 1990 The groundwater flow direction beneath the Site has generally been to the east and northeast a I Y 11CALTRANS1Stockton-Shop MGW Monitonngl3rd Qtr 20051Q3 05 OM&M_Finai doc November 29 2005 Protect No 940T 43148 00 1 SECOR international Incorporated