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• <br />Comments on Checklist of Required Data <br />Site Name and Location Tuff Boy Trailers 5151 Almondwood Drive Manteca California <br />4 Stockpiled soil Based upon non -detect results from a 4 1 composite soil sample collected from the <br />soil stockpile, Ground Zero recommended on-site management of soil cuttings, which was approved by San <br />Joaquin County in correspondence dated June 8, 2001 A table summarizing soil analytical results is <br />attached <br />5 Monitoring wells remaining onsite Wells MWl, MW2, MW3, and MW4 will be destroyed upon <br />issuance of no further action (NFA) letter <br />10 Reports/mformation Unauthorized Release Form, March 23, 1999, Quarterly Monitoring <br />Reports—Ground Zero Analysis, Inc Quarterly Monitoring and Sampling Reports, April 14, 2001, <br />October 29, 2001, January 22, 2002, and April 12, 2002, Workplan for Subsurface Investigation, <br />December 3, 1999, Subsurface Investigation Summary Report, March 23, 2000, Workplan for <br />Groundwater Monitoring Well Installation, August 11, 2000, Groundwater Monitoring Well Installation <br />Report, April 18, 2001 <br />1• 11 Best available technology (BAT) used Not Applicable Due removal of source material and due to <br />declining low levels of gasoline hydrocarbon constituents remaining in groundwater beneath the site, no additional <br />active remediation is warranted <br />12 Reason why background was unattainable using BAT Background will be <br />achieved over time by natural attenuation <br />13 Mass balance of treated versus rernaimng contaminants Not applicable However, the mass of <br />contaminants remaining in the soil and groundwater has been calculated and the calculations are attached <br />15 Rationale why conditions remaining at site will not adversely impact water quality, health, or other <br />beneficial uses No formal risk assessment or fate and transport modeling was conducted The tank removal and <br />minor overexcavation have removed the source from the soil Dissolved hydrocarbons in groundwater have <br />declined significantly in all wells MTBE is present in groundwater beneath the site, but has generally declined <br />and is currently only marginally above the secondary MCL in well MW -1 (6 0 ppb in March 2002), is below the <br />MCL for wells MW3 and MW4, and is below the laboratory detection limit m well MW2 (see tables and charts <br />showing concentration vs time, attached) Contaminant concentrations in groundwater and soil are expected to <br />continue to decline through natural attenuation <br />