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• 06 November 2003 AGE-NC Project No 98-0511 Page 3 of 5 Health Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational Safety and Health Administration, U S Coast Guard and U S Environmental Protection Agency, 1985) Prior to mobilization, the proposed monitoring well locations will be clearly marked and a utility clearance obtained through Underground Service Alert The SJCEHD and City of Lathrop will be notified 48 hours prior to conducting investigation activities 32 SOIL AND GROUNDWATER SAMPLE COLLECTION AND ANALYSIS AGE proposes to advance two soil probe borings using direct push technology to approximately 20 feet bsg for collection of soil and `grab' groundwater samples One boring will be advanced east of Seventh Street, up-gradient of the former UST location, a second boring will be advanced near the former dispenser location(Figure 2) As the borings are advanced, soil samples will be collected at 5-foot intervals beginning at 5 feet bsg and extending to the total probe boring depth The proposed probe boring locations are illustrated in Figure 2,proposed probe boring locations may be modified due to field observations Field procedures for advancement of probe borings and collection of soil and groundwater samples are presented in Sections 4 1 through 4 3 • Ground water and selected soil samples from the probe borings will be submitted for laboratory analysis The selected samples will be analyzed by a State of California Department of Health Services (DHS)-certified laboratory for the following constituents • Total petroleum hydrocarbons as gasoline (TPH-g) by EPA Method 8015 Modified, and • Purgeable aromatic hydrocarbon compounds including benzene,toluene, ethylbenzene,and total xylene (BTEX) and fuel additives including di-isopropyl ether(DIPE), ethyl tertiary- butyl ether(ETBE),methyl tertiary-butyl ether(MTBE),tertiary-amyl methyl ether(TAME), tertiary-butanol (TBA), ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) by EPA Method 8260B Laboratory reports for the soil analyses,testing methods,laboratory quality assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be presented in a report with findings and recommendations 33 REPORT PREPARATION Upon completion of field work and receipt of final laboratory analysis, a report will be prepared presenting the findings of the investigation The report will include a description of the work . performed and the results of the sampling and the laboratory analyses In addition, the report will include a maps and cross-sections showing the horizontal and vertical distribution of petroleum Advanced GeoEnvironmental,Inc