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Geo(ogicaf?ecFznics Inc. S./ Page 3 Gubary Project No. 775.2 July 13, 1999 sampling by filling the decontaminated stainless steel bailer with water (provided by the laboratory) and then filling a VOA vial (provided by the laboratory) using the same procedures for actual sample collection. A chain of custody document, listing all samples collected, accompanies the samples from field to laboratory, thereby providing a means to track their movement and insure their integrity. 3.0 LABORATORY ANALYSES 3.1 Soil Analyses Based on field screening observations up to five soil samples from SB-1 will be submitted to Sherwood Laboratories of Hilmar (State Certified Laboratory #1400) for the following analysis: • benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 8020 • gasoline range petroleum hydrocarbons (TPH-G) by EPA method 8015(m) • methyl tertiary butyl ether(MTBE)by EPA method 8020 ❑ One soil sample will be tested for MTBE, ETBE, TAME, DIPE & TBA by EPA method 8260. The detection limits for these compounds are listed below. A Chain of Custody will be completed for all samples collected and tracked to ensure sample integrity. DetectionLimits: BTEX TPH-UEthers Soil ([Ig/Kg) , 3.2 Groundwater Analyses One groundwater hydro h sample from SB-1, SB-2 and SB-3 and the groundwater le collected bmin-UW-V will be submitted to Sherwood Laboratories of Hilmar (State Certified Laboratory#1400) for the following analysis: • benzene,toluene, ethylbenzene and xylene (BTEX) by EPA method 602 • gasoline range petroleum hydrocarbons (TPH-G)by EPA method 8015(m) • MTBE, ETBE, TAME, DIPE & TBA by EPA method 8260. The detection limits for these compounds are listed below. A Chain of Custody will be completed for all samples collected and tracked to ensure sample integrity. DetectionLimits: Ethers TBA Water µg . -- 1.o 4.0 SCHEDULE & REPORTING Geological Technics Inc. anticipates beginning fieldwork no later than 30 days after work plan approval and upon issuance of the drilling permit. The information gathered during this phase of work will be presented in a report that will include a summary of the geology as well as the results of sample analyses. Dr. Ray Kablanow, a registered professional geologist, will supervise the project. Copies of the report will be forwarded to both the appropriate County and State regulatory agencies (S3C PHS/EHD and CRWQCB).