Laserfiche WebLink
CLOSURE REQUEST REPORT Section No 6 0 <br /> Former American Forest Products Company 07/31/01 <br /> 2801 West Lane Page 6-1 <br /> Stockton,California <br /> 6.0 CONCLUSIONS AND RECOMMENDATIONS <br /> This Closure Request Report for the former American Forest Products Company was prepared as the final <br /> step in requesting final closure for the site This report presents a compilation and evaluation of site data <br /> according to the requirements outlined in Tri-Regional Board Staff Recommendations for Preliminary <br /> Investigation and Evaluation of Underground Tank sates B Request for Closure Document, Appendix B <br /> 6.1 CONCLUSIONS <br /> This Closure Request Report is a compilation of data and information being presented to the PHS-EHD <br /> supporting closure of the UST system at the site as a Iow-risk groundwater site Site closure is <br /> recommended, based on the reason including <br /> • The sources of TPH impacts, the two USTs, have been removed <br /> • Approximately 47% of the TPH-impacted soil has been removed and treated <br /> • Residual TPH impacts are located primarily at depths between 20 and 30 feet bgs <br /> Groundwater levels have been at 35 feet bgs or deeper, which would limit the potential for <br /> leachate generation <br /> • TPH detections above the taste and odor threshold of 100 ug[L appear to be limited in areal <br /> extent Free diesel product has never been reported at the site A large, severe groundwater <br /> impact is not present <br /> + TPH detections are primarily weathered diesel, indicating that natural degradation is <br /> occurring <br /> • Leachate development is limited by the asphalt cap installed at the site in 1990 <br /> • The potential for human exposure is limited by the depth of residual soil impacts, and the <br /> distance to the nearest drinking water well <br /> 6.2 RECOMMENDATIONS <br /> Site closure is recommended, based on evaluation of criteria specified by the RWQCB Based on this <br /> information,the site appears qualified for"No Further Action" status <br /> K 1840i91afp1afp_e1osure_rpt doe 07/31/01 3 24 PM <br />