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PUBLIC HEALTH SERVICES " J <br /> 4.•4U ih...c <br /> ,..� .o <br /> SAN JOAQUIN COUNTY =: i <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> TITLE: UNDERGROUND TANK METALS EVALUATION GUIDELINES <br /> NUMBER: 94-002 <br /> EFFECTIVE DATE: 02-02-94 <br /> SUPERSEDED: N/A <br /> APPROVED BY: DATE: -�—q� <br /> PURPOSE: <br /> To provide Public Health Services, Environmental Health <br /> Division staff with a consistent and methodical guideline for <br /> evaluating metals associated with petroleum underground <br /> storage tank (UST) sites for hazardous levels and/or potential <br /> threat to groundwater. <br /> This guideline is for use with petroleum underground storage <br /> tank sites only as the metals associated with these types of <br /> sites are specific to certain petroleum mixtures . The <br /> evaluation of metals at other sites may be more complicated <br /> and may require additional training on the environmental fate <br /> and transport of metals . These sites are not addressed in <br /> this guideline. <br /> The metals associated with petroleum hydrocarbons have been <br /> found to migrate with, and within, the petroleum hydrocarbon <br /> plume as it travels through the soil . With the exception of <br /> UST sites that have had a massive release of petroleum, <br /> metals associated with most releases become attenuated to the <br /> soil as the plume migrates laterally and vertically. Based on <br /> these findings, the threat a metal poses to groundwater can be <br /> evaluated by determining the threat the petroleum poses to <br /> groundwater. It can be assumed, in most UST cases, that if a <br /> release of petroleum is shown not to threaten groundwater, <br /> then the metals associated with that release will also not <br /> pose a threat to groundwater. <br /> For UST cases where a massive release of petroleum has <br /> impacted groundwater, the soil and groundwater data generated <br /> from the investigation will be evaluated for the actual and/or <br /> potential threat to groundwater the metal (s) may pose. <br /> 1 <br /> A Division of San Joaquin Countv Health Care Services <br />