Hazardous Waste Cleanup Section Drycleaning Solvent Cleanup Program




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Hazardous Waste Cleanup Section

Drycleaning Solvent Cleanup Program




Procedures for Soil Vapor Extraction System Shut Down

Report Recommendations

  • The consultant should include recommendations for Soil Vapor Extraction (SVE) system shutdown in the Remedial Action Status Report.


  • Recommendations are based upon the current site data (see Data to Support SVE Shutdown section), and remedial history of the site.

  • Include in the recommendations:

    • Anticipated monitoring timeframe to achieve No Further Action Criteria,

    • Current operational status of the facility: active, closed or drop off only,

    • Anticipated use of the treatment system: surplus, reuse at another site, temporarily kept on site, or stored off site.


Data to Support SVE Shut Down

  • Vapor - vapor influent samples should be collected for total influent and from all pertinent individual SVE wells

    • Subsequent vapor samples collected during pulsing should include total influent sample and any select pertinent SVE wells

    • Samples shall be analyzed using Method TO-15

  • Influent concentrations show a downward trend or leveling-off has occurred

  • Soil data from historical sampling and recent (confirmatory) data is included

    • Confirmatory soil sampling should include sampling within the known source areas

  • Groundwater data indicates that source areas are not acting as continuing sources to shallow groundwater.

  • Site has an interior (i.e. within the facility or structure) water table monitoring well that has been sampled prior to system shut down (when feasible).

  • Operating parameters such as ROI, vacuum, and air- flow are shown to have adequately addressed source areas.

  • 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).

  • Procedure:

    • Shut down system for one month,

    • Following the system restart collect vapor samples from total influent and select pertinent SVE wells,

    • Continue to run SVE system until analytical data is received from lab,


    • E-mail lab data to DEP PM

      • If concentrations remain at or below the concentrations that were included in the final approved Remedial Action Status (O&M) report, the system may be turned off.

      • If concentrations exceed those identified in the final Remedial Action Status (O&M) report, continue to run the SVE system for an additional quarter and resample.


Report Review

  • The DEP PM will complete the review of the Remedial Action Status (O&M) report and forward their review comments along with a request for review to the technical review staff.

  • Technical review staff must approve the recommendation prior to beginning system shut down.

  • Written approval must be sent to the contractor prior to beginning system shut down procedures

  • Current reports and approval letters are uploaded to Oculus


System shut down procedures

  • For operating drycleaners:

    • if the facility has compliance related issues, the DEP Project Manager will send a request to the DSCP EM for an inspection,

  • 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.

  • Prior to system transfer or surplus, proper notification to the DEP Property Custodian must be completed.


Groundwater Monitoring/SRCO

  • For a site with no groundwater contamination, only one groundwater monitoring event is required.

  • For sites with groundwater contamination, when the SVE system is turned off the site may enter the natural attenuation with monitoring phase.

  • The site must meet the NFA criteria following NAM in order to issue a SRCO:

    • A minimum of 4 sampling events are required,

    • The last two consecutive events must meet NFA requirements,

    • Monitoring should be completed no more frequently than quarterly.


6/16/10






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