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Wendy Cohen Fes/ <br /> Page 2 <br /> March 31, 1997 <br /> WORKPLAN 222 NORTH EL DORADO STREET <br /> OBJECTIVE <br /> The objective of this investigation is to determine the extent of hydrocarbon impact in the <br /> basement of the 222 North El Dorado Street property in Stockton,California. The assessment <br /> will consist of subsurface sampling-in the basement of the_building;where vary .lev_els <br /> hydrocarbons(specifically weathered gasoline)were previously detected. The workplan also <br /> includes the installation of one groundwater monitoring well in the northeastern portion of <br /> the property,down gradient of the hydrocarbon.detections in the soils which were detected <br /> in the basement of the structure. <br /> SCOPE OF WORK <br /> Site Safety and Health Plan <br /> Prior to subsurface testing, as required by law, a Site Safety and Health Plan(SSHP)will be <br /> prepared in order to insure that all workers and sub-contractors are aware of the risks and <br /> safety procedures relative to the Phase II testing. A copy of the SSHP is attached to this <br /> work plan. <br /> Underground Service Alert <br /> Additionally, as required by law, Underground Service Alert (USA) will be contacted to <br /> check the proposed probe locations and well locations for conflict with public utilities, such <br /> as gas or electrical lines. <br /> — <br /> Ana'lytical`'f'esting(Soil)_ �. .__•__ <br /> We propose placing five geoprobes to depths of approximately 15 feet below ground surface <br /> (bgs)in the basement to fully define the horizontal and vertical extent of impact. During the <br /> probing and monitoring well installation, samples will be collected every five feet. Select <br /> samples will be analyzed for Total Petroleum Hydrocarbons (TPH) by EPA Modified <br /> Method 8015 as Motor Oil,Diesel and Gasoline,and for Benzene, Toluene, Ethyl benzene, <br /> and Xylene (BTEX) by EPA method 8020. Samples will be field screened using a Photo <br /> I6nization Detector(PID). <br /> Analytical Testing(Groundwater) <br /> A monitoring well will be installed east of the detections of weathered gasoline. This will <br /> place the monitoring well in the northeast corner of the property. 'Samples will be collected <br />