MAGs - may be used as a line of evidence to support SVE system shut down. For verification purposes, MAGs may be used in areas where water table well(s) are not feasible, and within areas that were not included in the SVE system area of influence.
System Pulsing –may be used to optimize the SVE system performance. If pulsing or cycling a system is recommended as a part of ongoing remedial efforts and is not performed to collect data in support of a decision for system shut down, approval from the DEP Project Manager (PM) may be obtained at any time via e-mail.
System Pulsing Prior to Shutdown (bumping a system) – prior to SVE system shutdown the contractor should obtain written approval from DEP technical staff (see Report Review).
Shut down system for one month,
Following the system restart collect vapor samples from total influent and select pertinent SVE wells,
The DEP PM will send “Notification of SVE Shutdown and Site Remedial Status Update” to the current operator, owner, and real property owner of the DSCP site.
The letter will notify the current operator, owner, and real property owner of the anticipated SVE system shutdown; it will give a brief summary of the data and indicate the justification for turning the system off.
For active drycleaners the letter should notify the current operator, owner, and real property that should a spill or new discharge occur the remediation will be their responsibility.
Following system pulsing - if concentrations remain at or below the concentrations that were included in the final approved O&M report, the system may be turned off.
SVE wells should be secured and equipment made ready for surplus or transfer.
SVE wells should remain intact, do not abandon SVE wells or monitor wells until the SRCO has been issued.