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' Geological7echnics inc. • • Pae 6 Fonzia g ' SGW1 Report Project No.: 774.2 June 10, 1999 ' • On site manufacturing processes during the early years of plant operations either from resin or dye. • Off site sources such as the former PG&E coal gas manufacturing plant that was located ' immediately east of the railroad track on the east side of this Property. I Bis(2-ethylhexyl) Phthalate is a plasticizer for various types of rubber and resins. It is also ' used in vacuum pumps and insect repellent and pesticide carriers. The compound has a fairly short half-life, approximately 10 days to 1 the more then a year in groundwater. There is no direct evidence that this chemical was eve used at the facility and so source determination is t difficult. Several possibilities exist. 1. Cross contamination, however this is probably not the source of this chemical found in this sample for the following reasons. ■ V&W Drilling uses low-density polyethylene tubing to collect the water samples via ' the Wattera hand pumping system. According to the manufacture, low-density polyethylene does not contain plasticizers. The driller does use latex rubber gloves for cross contamination and cleanliness purposes. This material probably contains several Phthalate compounds. However, short contact times that may have occurred during the transfer of the samples into sample containers should not have caused levels of 22 ppb. If a small fraction of the glove had torn off and entered the sample ' container, it would have been filtered out in the lab prior to extraction. ■ BSK Laboratories used glass fiber filters and glass funnels and containers to handle these samples in the process of preparing them for analysis and analyzing them by EPA method 8270 so they did not come in contact with materials that would contain ' phthalates. The sample which test d positive, was run through the instrument in the middle of a sample run from this site, i.e., samples were run before and after this sample and they were all non-det e't for phthalates. So it was not a case of trace ' amounts phthalates being left in th machine from earlier sample. 2. Off site locations with known contamination may be a possible sources of the Bis(2- ethylhexyl) Phthalate found at 33 feet bgs. Two sites in the immediate vicinity have been shown to contain PNA compounds. ' ■ PG&E - adjoins this Property to the east and is located immediately east of the rail road, which borders the east of this property. ■ Former Mobile Bulk Storage Facility — is located northeast of this Property. Testing ' performed at the site in 1993 showed the presence of 2-ethylhexyl Phthalate in the groundwater. ' The Phenol and Bis(2-ethylhexyl) Phthalate that are present at the site do not appear to pose a threat to human health and the environment. The concentrations are relatively low and do not appear to be widespread on the site. Because phthalates have been detected at other sites ' in the area in the groundwater and it was riot detected in the soils or shallow groundwater at the site, it is most likely that an offsite source is responsible for the Bis(2-ethylhexyl) Phthalate. ' Table 1 in Appendix A is a full summ 3ry of the soil and groundwater analytical data collected at the site to date. The lab data rc ports are attached in Appendix B. 1