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Ms. Wendy L. Cohen, Chief - 5 - 5 March 2003 <br /> to the depth and extent of ammonium identified in areas of spills can be addressed during remediation or <br /> Lthrough confirmation samples. <br /> If WFS intends to remediate ammonium and nitrate by excavation, it needs to provide a schedule to <br /> develop a cleanup plan. If WFS intends to pursue other alternatives for nitrogen remediation, it needs to <br /> prepare a FS/RO to discuss various options. A cleanup plan or a FS/RO should include site maps <br /> illustrating where contaminated soil was previously removed, and where the on-site septic system is. <br /> In the 1998 Remedial Alternatives Assessment, WFS presented a summary of all work that has been <br /> completed at the site, including detailed presentation of the soil sampling history. The FS/RO does not <br /> need to duplicate this work and may incorporate the Remedial Alternative Assessment by reference. The <br /> primary objective of the FS/RO is to evaluate various methods to remove ammonium and nitrate from <br /> soil. <br /> AST <br /> ti <br /> r. <br />