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JYMYv&ffioore <br /> Geotechnical&Environmental Sciences Consultants <br /> May 23, 2019 <br /> Project No. 403488001 <br /> Mr. Kyle Cockerham <br /> Site Cleanup Unit <br /> Regional Water Quality Control Board, Central Valley Region <br /> 11020 Dun Center Drive, Suite 200 <br /> Rancho Cordova, California 95670 <br /> Subject: Site Assessment Work Plan <br /> Stockton Courthouse <br /> 180 East Weber Avenue <br /> Stockton, California <br /> Case No. 2050519 <br /> Dear Mr. Cockerham: <br /> Ninyo & Moore is pleased to present this Site Assessment Work Plan (Work Plan) to the Regional <br /> Water Quality Control Board, Central Valley Region (Central Valley Water Board, RWQCB) on <br /> behalf of the Judicial Council of California (JCC) for additional site assessment at the Stockton <br /> Courthouse located at 180 East Weber Avenue in Stockton, California (Site). The additional Site <br /> assessment activities we propose are related to two underground storage tanks (USTs) and a soil <br /> area-of-concern (AOC) that were discovered during Site redevelopment in 20141. The Site location <br /> is shown on Figure 1, and the USTs and soil AOC location is shown on Figure 2. <br /> Following discovery of the two USTs and soil AOC, the USTs were removed and soil excavation <br /> was performed to the extent feasible during redevelopment, resulting in the removal of 260 cubic <br /> yards of impacted soil and 4,000 gallons of groundwater. Seventeen soil samples and two grab <br /> groundwater samples were collected from these areas. These activities and results are described <br /> in Ninyo & Moore's 2014 report. <br /> Total petroleum hydrocarbons (TPH) as motor oil (TPHmo), diesel (TPHd), and gasoline (TPHg); <br /> volatile organic compounds (VOCs); and polycyclic aromatic hydrocarbons (PAHs) were detected <br /> in soil and groundwater samples. Some TPH and PAH detections exceeded Regional Water <br /> Quality Control Board, San Francisco Bay Region December 2013 Environmental Screening Levels <br /> i Ninyo & Moore 2014. UST Removal and Soil AOC; Stockton Courthouse Redevelopment Site, 180 East Weber <br /> Avenue, Stockton, California;Ninyo &Moore,dated September 22. <br /> 2020 Challenger Drive, Suite 103 1 Alameda, California 94501 1 p. 510.343.3000 1 www.ninvoandmoore.com <br />