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i <br /> r <br /> 01 i <br /> is <br /> LEEo9HILL-HERrir,HHOFF.WC. <br /> 1 c <br /> ,.� Based on procedures and recommendations established in the LUFT Manual, the Weber <br /> r Point property has a leaching potential a;ialysis score which indicates that due <br /> to the site specific hydrogeologic conditions, if residual petroleum hydrocarbon <br /> ' constituents are left in the soar, there is a high potential fur these residuals <br /> to migrate and impact the groundwater resources in the area. The _UFT Manual, <br /> assumes naturally compacted d soil with no cover; t1he Weber Point property <br /> is completely covered with asphalt or concrete, greatly •educing the natural <br /> leaching potential. For the conservative case of no g�aund haver, the LUFT <br /> ration which can be left in <br /> Manual recommends that the TPH as gasoline concent <br /> place without posing a threat to the groundwater resources Is 10 ppm or less. <br /> According to the LUFT Manual, at this low TPH level, BTX&E levels are not <br /> .�, applicable. The recommended maximum allowable residual levels from the LUFT <br /> Manual evaluation alsoresented <br /> ze the eleaching potentia. arem of Table 2. included LUFT Manual <br /> evaluationtables which <br /> Appendix F. <br /> Manual, the general risk appraisal, relies an <br /> The second analysis in the LUST <br /> generalized environmental fate, chemistry data, and some site-specific <br /> ults from the <br /> r^ information. eiera3rri because appraisal is e not sapplicable for this c site.analysis, g <br /> Soil borings S83 and SB4 contained detectable levels of TPH as gasoline above <br /> recommended LUFT Manual maximum allowable concentration levels to depths less <br /> than S feet above the potentiometric groundwater surfar;e. These sails are a <br /> potential continuing source of groundwater contamination and cannot be left in <br /> "- place and must be remediated. <br /> 5.2 EVALUATION OF GROUNDWATER <br /> The LUFT Manual does not specify maximum allowable petroleum hydrocarbon <br /> concentrations .in groundwater. Therefore, for illustrative purposes only, eE <br /> will compare the analytical results from the monitoring wells to establishd <br /> ed <br /> ` California drinking water standards, <br /> + <br /> DOHS has established maximum contaminant levels (MCL's) for specific organic and <br /> inorganic chemicals (Title 22, Section 64444.5 of the California Cone of <br /> of regulated chemicals: <br /> Regulations. Three gasoline constituents are on the list <br /> jqUjjtuqnt FSCL {in oobl <br /> 4 <br /> Benzene `1 <br /> Xylene 1750 <br /> �- Ethylbenzene 680 <br /> An MCL is a legally enforceable maximum level; therefore, water to be provided <br /> �.: contain contamination levels in excess of the <br /> for public consumption. cannot <br /> established MCL. <br /> f <br /> 24 <br />