REMOVAL 2011 CLOSURE IN PLACE - Laserfiche WebLink

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� s • ' 2.1 Pre-UST Closure Activities ' Pre-UST closure activities included permitting and preparation of a Workplan for the SJEHD. ' 2.1.1 Permitting And Workplan PSI developed a permit application for the in-place closure of the UST located at the ' Subject Property. PSI submitted the permit application to the SJEHD on October 20, 2011 and received permit approval on October 26, 2011. PSI also submitted a Workplan for the in-place closure dated October 20, 2011, which was approved by the SJEHD on October 24, 2011. A copy of the approved Permit and Workplan are included in Appendix A. 2.1.2 UST Preparation ' Equipment to prepare the site for in-place closure of the UST was mobilized to the project site by All Chem, a PSI subcontractor, on October 25, 2011. All Chem removed the overlying soil to uncover the UST using a backhoe. ' 2.2 In-Place UST Closure Activities On October 26 and 27, 2011, under the supervision of Mr. Jeff Wong of the SJEHD, PSI completed the following tasks in-place closure of the UST; ' ➢ Excavated tank covering and exposed tank top. ➢ Checked LEL levels within the UST and applied Organic Vapor Suppressant and Dry Ice to reduce the LEL and oxygen levels to 0% and 2.3%, respectively, as measured by All Chem and witnessed by Mr. Wong of the SJEHD. ➢ Removed debris and contaminated solids currently present in a small volume at the ' bottom of the UST, with shovels and segregated within 55-gallon open-top, DOT rated drums. Approximately 100 gallons of residual diesel/water/soil was pumped out/removed from the UST and stored in two 55-gallon drums. The drums were left ' in a secure location on site; pending proper transport and disposal (see Section 2.3.2). ➢ Cleaned interior of the UST with a simple green and water solution using rags and a ' mop handle. Containerized any equipment used to clean the UST within the 55- gallon open-top, DOT rated drums. ➢ Backfilled the cleaned UST shell, with five cubic yards of 2 sack sand slurry, as ' witnessed by Mr. Wong. Visual and olfactory indications of stained soil were noted during the in-place closure activities. Excavated soil was stockpiled for future sampling and disposal. The UST was observed to have minor holes that grew larger during the cleaning of the UST. Groundwater was not encountered during in-place closure; however water was noted ' within the UST and was removed as stated above. Based on depth to groundwater 2 1