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City of Stockton A68101.02A July 21, 1995 Page 4 2.3 Laboratory Testing: The proposed preparation and analytical methods for the laboratory analyses are summarized in Table 2. m alE x:. .... : . PROPOSM PREPARATION AND.ANALyniI AL ME1HU17 Type of Analysis Preparation Method Analytical Method Detection limit for Reporting mg/kg Benzene,Toluene,F-thylbenzene, 50301 80201 0.005 and Xylenes Total Petroleum Hydrocarbons- 5030 GC/FID2 1.0 Gasoline Range Constituents Total Petroleum Hydrocarbons- 5030 GC/FID 10 Diesel Range Constituents mg/kg = milligrams per kilogram GC/FID = Gas Chromatography/Flame Ionization Detection 1 United States Environmental Protection Agency,March 1983,Methods for Chemical Analysis of Water and Waste, Second Edition. 2 State of California Water Resources Control Board,February 1988,Gas Chromatography/Flame Ionizatian Detection, Draft Method for Total Petroleum Hydrocarbons,Hazardous Material Laboratory,Department of Health Services, Reproduced from Leaking Underground Fuel Tank(LUFT) Field Manual. Twining is a California Department of Health Services certified hazardous waste laboratory (Certificate No. 1371) for the analyses outlined herein. 2.4 Technical Report: Upon completion of field and laboratory activities, a technical report will be prepared summarizing results and findings. Evaluations will be provided regarding the vertical and horizontal extent of PPC migration in soil. Finally, the report will provide either recommendations regarding the need for further site assessment and/or site remedial actions, or a request for a clean closure. 3.0 SITE SAFETY PLAN The operations site safety plan for the Twining personnel assigned to the project are discussed in the following subsections. 3.1 Potential Health and Safety Hazards: Information developed regarding the site indicates that petroleum products are the potentially hazardous substance that has been stored on-site.