SITE INFORMATION AND CORRESPONDENCE

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Di salvo Tmck Lines-SIR March 9. 1995 i Page-3- 3.0 FIELD PROCEDURES Prior to beginning field work, a tailgate safety meeting was held and a site-specific health and safety plan was discussed with, and signed by all crew members. Condor proposed, in the work plan approved by SJCPHS,EHD, to install five soil probes and two optional soil probes to investigate the extent of soil and groundwater contamination at the Di Salvo Truck Lines site. On January 19, 1995, 1 k a total of four soil probes (SPI through SP4) were installed at the site. A fifth soil probe located near the center of the tank excavation was abandoned because the sidewalls of the soil probe continued to collapse as the coring tool was retracted from the probe hole. The optional soil probes were not installed at he site. The location of soil probes SP I through SP4 are shown in Figure-2, Appendix A. i Each soil probe was installed using a Geoprobe.percussion-driven, tool operated by Vironex. The total depth of the four soil probes was approximately 16 feet below around surface (bgs). Each soil probe was installed and destroyed under .the supervision of Keith Tailia (C57 License *323417). A Condor geologist was on site to observe the installation of, and to collect soil and groundwater samples from, each soil probe. y F 3.1 Sample Collection - Soil SPI was installed using a Geoprobe 1.125 inch O.D. drive-point sampler. Soil samples were collected from SPI at 5, 9 and 12 feet bgs using a clean, stainless steel .sampling tube fitted with four, p 1-inch diameter, clean brass sleeves. Prior to each sample collection, the sampling tube was cleaned ina solution of non-phosphate detergent and potable water then double-rinsed with potable water. During sampling, the soil.probe tip was retracted and the sampling tube was driven into native soil. The bottom-most tube was prepared for shipment to the laboratory and the remaining tubes were discarded. During the first attempt to collect a groundwater sample from SPI, a sufficient quantity of groundwater could not be retrieved within a reasonable period of time (approximately one hour) using the available sampling equipment for a 1.125 diameter hole. Therefore, SP I was re=installed using a 2-inch O.D. continuous coring tool. i SP2, SP3 and SP4 were continuously cored in four foot sections from the ground surface to the total depth of approximately 16 feet bgs. Prior to coring, the coring tool was cleaned as described in 'the preceding paragraph. The coring tool was then fitted with a new, disposable polyethylene- n LJ CONDOR ! i I