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TABLE 1 - EVALUATION OF LOW THREAT UNDERGROUND STORAGE TANK <br />CASE CLOSURE POLICY CRITERIA <br />Criteria I Meets Criteria? I Comment <br />General Criteria <br />The general criteria established bythe SWRCB under Resolution No. 2012.0016 that must be satisfied by candidate sites are as follows: <br />a. The unauthorized release Is located within the <br />The site Is located In the City of Santa Ana, where water utility service <br />service area of a public water system. <br />Yes <br />is owned and operated by the City of Santa Ana for public service. <br />b. The unauthorized release consists only of <br />The unauthorized release Is from multiple gasoline underground <br />petroleum. <br />Yes <br />storage tank leeks that was Identified In February 1988. <br />G. The unauthorized release from the UST system <br />Multiple USTs were removed In June 1988, which were the cause of <br />has been stopped. <br />Yes <br />the unauthorized release of gasoline to the subsurface. <br />d. Free product has been removed to the <br />Free product has not been a concern at the site. Contamination in soil <br />maximum extent practicable, <br />and groundwater has been remediated through excavation of soils In <br />Yes <br />the lank cavities In 1988, operation of an SVE system between 1994 <br />and 1996, application of ORO to the subsurface In 1999, and two <br />HVDPE events In 2D00 and 2003. <br />e. A conceptual site model that assesses the <br />A soli vapor survey and health risk assessment was conducted in <br />nature, extent, and mobility of the release has <br />2013, which developed a conceptual site model and summadzed <br />been developed. <br />Yes <br />potential risks to on-site workers and nearby residences. Health risks <br />to receptors were determined to be negligible <br />I. Secondary source has been removed to the <br />The secondary soil source has been removed to the extent <br />extent practicable. <br />Yes <br />practicable. However there are still residual soil Impacts (as indicating <br />tmm confirmation soll bodngs) that may need to be left In place <br />g. Soil and groundwater have been tested for <br />MTBE has been tested in soil and groundwater for many different <br />methyl lad -butyl ether (MTBE) and results <br />investigations and monitoring reports. Currently, the maximum <br />reported In accordance with Health and Safety <br />Yes <br />concentrations of MTBE detected Is 1.5 pgd in groundwater, which Is <br />Code section 26296.15. <br />below the MCL of 13 pgll. <br />h. Nuisance as defined by Water Code Section <br />Under the Call Is Water Code, section 13050(m), nuisance means <br />13050 does not exist at the site. <br />anything which meets all of the following requirements: <br />1. Is Injurious to health, or Is Indecent or offensive to the senses, or an <br />obstruction to the free use of properly, so as to Interfere with the <br />comfortable enjoyment of life or property, <br />2. Affects at the earn time an entire community or neighborhood, or <br />Yes <br />any considerable number of parsons, although the extent of the <br />annoyance or damage Inflicted upon Individuals maybe unequal, <br />3. Occurs during, or as a result of, the treatment or disposal of wastes. <br />Based on a review of historical documents, a nuisance is not <br />applicable to the site contamination. <br />Media -Specific Crtteria <br />Medla-specific criteria established by the SWRCB under Resolution No. 2012-0016 that must be satisfied by candidate sites are as <br />follows. Candidates must satisfy the criteria for the three medias of concern: (1) groundwater, (2) vapor Intrusion to Indoor air, (3) direct <br />contact and outdoor air exposure, <br />1. Groundwater <br />If groundwater with a designated beneficial use is <br />The site Is located Wthln the Omnge County Management Zone of the <br />affected by an unauthorized release, to satisfy the <br />Santa Ana RWQCB. The areas Is used for beneficial uses, Including <br />media-speclfic criteria for groundwater, the <br />municipal and agricultural supply wells. Currently, the nearest <br />contaminant plume that exceeds water quality <br />municipal groundwater well Is over 2,500 feet from the site. The <br />objectives must be stable or decreasing In areal <br />contaminated groundwater plume Is considered stable, but high <br />extent and meet all of the additional <br />The site vlclnity Is <br />concentrations of TPHg still persist In shallow groundwater. <br />characteristics of one of the classes of sites listed <br />eligible for beneficial <br />below. Aplume that Is 'stable or decreasing' Is a <br />use <br />contaminant mass [hat has expanded to Its <br />maximum extent the distance from the release <br />where attenuation exceeds migration. <br />Class 3 <br />a. The contaminant plume that exceeds water <br />The cunent groundwater plume of TPHg and benzene Is <br />quality objectives is lass than 250 feet In length. <br />Yes <br />approximately 100 feet In length In the longest dimension. <br />25F-54 <br />