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' Existing Nestle Warehouse 4343 East Freemont Street ' Stockton, California Project Nos. 2E-940917 and 2G-941101 Page 5 3.2.4 Soil Cuttings All soil cuttings generated during the drilling process will be field screened using the HNu photoionization detector. Soil samples taken from the geotechnical borings will be ' disposed of the in the existing fill area located at the northern end of the site, unless elevated levels of VOC vapors are identified during drilling. Soil samples taken from the environmental borings will be placed in DOT approved 55 gallon drums for on-site storage. These drums will ' remain on-site in the custody of the current property owners. 3.2.5 Soil Vapor Scan All recovered below-grade soil samples will be subjected to a headspace volatile vapor ' scan using a properly maintained and charged 11.7 eV photoionization detector(HNu Model No. PI-101) calibrated to benzene standard. The volatile vapor scan technique is a screen method used to assess the presence of volatile organic vapors such as those existing in gasoline or higher ' concentrations of motor oil or other volatile organic compounds (VOCs). The 8 ounce soil sample containers will be filled approximately '/z to 3A full in the field, will be allowed to warm to approximately ambient air temperature prior to the vapor scan. The results of the PID vapor ' scan will be used, in part, to determine which soil samples are to be submitted for detailed analytical testing. ' 3.3 Laboratory Testing As part of the proposed scope of services, it is not anticipated that any analytical testing ' will be conducted on the soil samples collected from the geotechnical borings. However, if the results of the PID vapor scan identify elevated levels of VOC vapors within the soil sample containers, laboratory testing may be conducted. The number and types of tests conducted on the geotechnical samples will be determined at the time of the field exploration, based on the location from which the samples were collected. ' Preliminarily it is anticipated that 10 to 15 samples collected from the environmental borings will be submitted for analysis of total petroleum hydrocarbons (TPH) by EPA Method 418.1. These tests will be used as a screening tool in order to determine if additional laboratory ' testing is required. The testing for TPH compounds is considered appropriate based on the most likely potential contaminants on this site which are motor fuels and creosote compounds related to the rail spur areas. If the results of the TPH testing indicate elevated levels of total petroleum hydrocarbons, additional laboratory testing will be conducted. For samples taken from the vicinity of the rail spur areas, this additional testing will consist of analysis for semi volatile ' organic compounds by EPA Method 8270 which includes compounds typically found in creosote.