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<br /> <br />. <br /> <br />. <br /> <br />Historical Information <br />A review of historical conditions along the alignment will be completed to identify sites <br />that may have closed, but may have contributed to site contamination. The historical <br />search will be completed by reviewing Sanborn maps of the area, if available. If these <br />maps are not available, historical aerial photogràphy will be used to identify sites that <br />may have used hazardous materials, or has the potential to cause site contamination. <br /> <br />Interviews <br />Regulatory agencies familiar with specific site conditions or contaminant occurrences <br />will be interviewed to obtain infúrmation on the type of contaminants detected, extent of <br />contamination, identify affected media, st¡¡.tus of remediation, and any other information <br />on site conditions. <br /> <br />Environmental Settina (eeFR 3letod) (To be conducted for the two additional Lane Channel <br />Desi~ Variations) <br />Information related to the geologic and/or hydrogeologic setting will be gathered to <br />identify potential migration pathways of contaminants. The data will be used to assess <br />the probability of off-site contamination reaching the project boundaries. <br /> <br />Site Soecific Files (alFRest GE!FRplotod) (To be conducted for the two additional Lane <br />Channel Desii" Variations). <br />Files maintained by state agencies, such as the Regional Water Quality Control Board <br />(RWQCB) for ground water impacts, the county environmental department for <br />underground storage tanks, and/or the city for contaminant occurrences, will be <br />reviewed to obtain information on specific properties suspected of presenting adverse <br />impacts to the project Files for these sites will be reviewed to gather information on <br />suspected contaminant occurrences, site geologic and hydrogeologic conditions, and <br />other site specific information that may define site conditions. <br /> <br />Site Reconnaissance (GSFR 3leted) (To be conducted for the two additional Lane Channel <br />Desien Variation",). <br />Once the potential contaminant sites have been identified by the databases, site files, <br />interviews, or historic data, the site locations will be physically located in the field. The <br />site reconnaissance will locate each suspected contaminant site and occurrence and <br />note its location on a site map depicting project boundaries. The reconnaissance will <br />consist of physically locating the site to determine the type of business present at the <br />location, the business name, and the general "house keeping" of the site, Other <br />unlisted potential contaminant sources identified during the reconnaissance will also be <br />located on the site map, <br /> <br />Documentation <br />A formal report describing the methodology used to identify potential contaminant <br />sites, findings, conclusions, and possible mitigation of affected environments will be <br />completed, Mitigation measures for specific media affected by contamination will not <br />be addressed since the feasibility of the remedial actions will not be evaluated in the <br />ISA (addressed in PSI phase). The Best Available Techñologies (BAT) that may be <br />used to reduce contaminant concentrations in affected media will be discussed, The <br />identified potential contaminant sites will be presented in a table that will list the site <br />name, location, and potential concern. <br /> <br />Products: <br />. Ten draft and final copies of ISA. <br /> <br />Parsons <br />Brinckerhoff <br /> <br />3 <br /> <br />"\3oc¡"' >Ioj\aIlOn\tnanagt'V"'d.s<:ø~.doc <br />