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• CHECKLIST OF REQUIRED DATA FOR NO FURTHER ACTION REQUESTS AT <br /> UNDERGROUND TANK SITES <br /> (continued) <br /> 10 Reports/information <br /> URF—July 23, 2001 <br /> Quarterly Monitoring Reports--Ground Zero Analysis, Inc Confirmation Groun ater_SaWphng, July <br /> 18, 2002 Groundwater Monitoring and Sampling Reports,October 23, 2002,,, ebruary 11, 206-i-,juanuary <br /> 24, 2003 and April 22,2003 a,rLo( Roo v s-r � vm3 COW'S 18 t'f4 <br /> Other reports--Ground Zero Analysis, Inc Summary o Site Acti tie elat d-fro--�jnserground <br /> Storage Tank Removal letter reports dated June 29, 2001—, September 6, 2 1, and Ocer 2, 2001, <br /> Workplan for Groundwater Monitoring Well Installation dated August22, 2001;-""'Groundwater✓ <br /> Monitoring Well Installation Report dated February 14, 2002,Sensitive Receptor Survey dated August <br /> 23, 2002' 8f2z��] UYYE <br /> 11 Best available technolosy(BAT)used Soil Excavation and Natural Attenuation <br /> 12 Reason why background was unattainable using BAT_ Not applicable The very low levels of residual <br /> soil and groundwater contamination do not pose a threat the human health or the environment and, <br /> therefore, additional expenditures are not warranted <br /> . 13 Mass balance of treated versus remaining contaminants The remaining volume of contaminated soil is <br /> estimated at a maximum of approximately 141 cubic yards, all within the saturated zone, containing an <br /> estimated 186 pounds of gasoline' It is estimated that approximately 193 cubic yards of contaminated <br /> soil was removed from the UST excavations in 2001 We have estimated that less than 0 1 pounds of <br /> gasoline remains in the groundwater, based upon the most recent analytical results A copy of the <br /> residual contaminant mass calculation sheet is included in Attachment D <br /> 14 Assumptions, parameters, calculations and model used in risk assessment and fate and trans ort <br /> modeling Not Applicable Most recent groundwater analytical results show that BTEX constituents <br /> were all below the primary MCLS No contaminated soil remains in the vadose zone No public <br /> drinking water wells are threatened from this release <br /> 15 Rationale why conditions remaining at site will not adversely impact water quality, health, or other <br /> beneficial uses As discussed in the most recent groundwater monitoring reports, the current levels of <br /> gasoline constituents in site wells are below applicable primary MCLS, no oxygenated gasoline <br /> additives, including MTBE, have ever been detected in any site well, the nearest known active water <br /> supply well is located approximately 1,100 feet up radient of the site and is screened from depths <br /> greater than 340 feet, the primary and secondary contamination sources have been removed in the <br /> form of UST removal and overexcavation <br /> 16 WET or TCLP results Not applicabel/not analyzed <br /> i <br />