Laserfiche WebLink
o Other Reports <br /> Site Assessment Report, April 1993 (Canonie Environmental), <br /> Work Plan Additional Environmental Investigation, October 12, 1993 (SEACOR), <br /> Environmental Assessment Report, June 14, 1994 (SEACOR), <br /> Work Plan Additional Environmental Investigation, August 8, 1994 (SEACOR), <br /> Environmental Investigation Report, May 4, 1995 (SECOR), <br /> Quarterly Status Report and Work Plan for Additional Environmental Investigation, <br /> January 9, 1996 (SECOR), <br /> Environmental Investigation and Quarterly Summary Report, October 9, 1996 (SECOR), <br /> Work Plan for Soil Vapor Extraction Pilot Test, June 26, 1997 (SECOR), <br /> Vapor Extraction Feasibility Testing, May 27, 1998 (SECOR), <br /> Corrective Action Plan, September 8, 1998 (SECOR), <br /> Work Plan for Air Sparge Well Installation, June 7, 1999 (SECOR) <br /> 1 o Well and Boring Logs <br /> Boring logs and well construction details are presented In Appendix C <br /> (11) Best Available Technology (BAT) used or an explanation for not using BAT, <br /> The best available technology was applied at the site based on the results of remediation <br /> 1• feasibility testing, addressed under Item 9 and Section 3 2 above Groundwater extraction was <br /> eliminated based on the associated cost and the ineffectiveness of this remedial alternative in <br /> removing petroleum hydrocarbons adsorbed to soil within the saturated zone Natural <br /> attenuation was not recommended based on the length of time and associated long term costs <br /> (12) Reasons why "background" was/is unattainable using BAT, <br /> Remediation clean-up goals for the site consist of the Tier II SSTLs established during the <br /> RBCA evaluation (Appendix D) Although TPHg was detected In post-remediation soil <br /> confirmation samples from borings SB-12 through SB-14 to a maximum concentration of 1,300 <br /> mg/kg (SB-12@30'), an SSTL had not been established for this analyte The only other analyte <br /> detected in post-remediation confirmation soil samples was xylenes at a concentration of 18 8 <br /> mg/kg (SB-12@30), which in its pure form as stated in tables Included in Appendix D, does not <br /> pose a risk to receptors through the various pathways analyzed Petroleum hydrocarbons In <br /> soil beneath the site will continue to naturally attenuate over time, as has been observed of <br /> petroleum hydrocarbon concentrations in groundwater within the site wells <br /> Residual TPHg and benzene concentrations remain in groundwater in well MWA Since no <br /> SSTL was established for TPHg, the residual concentrations cannot be evaluated Dissolved <br /> benzene concentrations that remain present in the well are below SSTLs for groundwater for <br /> residential and commercial worker exposure through inhalation of volatilized concentrations <br /> migrating to Indoor and outdoor air (Appendix D) The decline of benzene concentrations below <br /> the SSTLs is the result of the operation of the SVEIAS system and natural attenuation of the <br /> dissolved plume <br /> Operation of the SVEIAS system resulted in the removal of a significant amount of petroleum <br /> hydrocarbon mass from beneath the site Due to the low soil vapor influent concentrations, the <br /> Time Oil Asmt&SCM doc 19 March 17,2005 <br /> 770T 41658 00 0015 <br />