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r <br /> 1 <br /> environment Leak plumes would be expected to be small and <br /> to not travel far from the point of release <br /> (4) The base oils are low in aromatic compounds, such as benzene, <br /> which pose a hazard in drinking water <br /> i <br /> (5) The base ods will biodegrade, at least partially, after they have <br /> been released into the environment. <br /> (6) The primary route of exposure after a release will be possible <br /> human ingestion via degraded drinking water. <br /> (7) The human toxicity (measured in terms of ingestion) associated <br /> with these oils is apparently very low or nonexistent. <br /> (S) It is unlikely that otherspecies of or anisms will be adversely <br /> affected by HLT releases under the conditions described above. <br /> I' <br /> �I <br /> 11 IV. RECOMMENDATIONS <br /> A. PERMANENT EXEMPTION FOR HLTS <br /> t Based on the survey results and evaluation of the toxicology and <br /> environmental fate and transport data, the SWRCB finds that HLTs <br /> pose a minor threat to water quality and the environment, and <br /> recommends that the temporary exemption for HLTs under the UST <br /> d law become permanent. <br /> ISG <br /> li RATIONALE FOR THE PERMANENT EXEMPTION <br /> 1) Hydraulic fluids are relatively insoluble in water and thus have <br /> limited ability to degrade ground water when leaked into sod. <br /> 21 Hydraulic fluids are relatively immobile in soil and do not travel <br /> far from the leak source. <br /> 31 Petroleum and vegetable-base oils for hydraulic fluid exhibit no <br /> b or low toxicity to humans. <br /> J� <br /> - 8 - <br />