Posts Tagged ‘VOC remediation’

Construction dewatering

Tuesday, December 1st, 2009

Tank installers commonly encounter ‘high water’ during the UST upgrade process.  Removal of the groundwater is required to proceed with the project.  In some cases the groundwater is ‘clean’ and discharge is authorized to a storm or municipal sanitary sewer system.  In most cases the tank pit water is contaminated with Volatile Organic Compounds (VOC’s), sometimes dissolved and sometimes free-phase.

Field crews will commonly underestimate the water volume and its infiltration rate.  Tanker trucks are a typical (and costly) solution to the problem.  On-site treatment is a less costly remedy for quantities in excess of 10,000 gallons.

With proper planning the installers or consultant can reduce costs, increase margin and maintain the schedule.  Sampling, regulatory approval and permitting good for everybody.  By staging the liquids in a frac-tank (BAKER), samples are analyzed and proper treatment may be applied.  Discharge as clean water saves time and money.

ReRem Equipment Corp provides modelling and treatment equipment support services.

Vapor Intrusion (VI)

Wednesday, March 4th, 2009

We just completed the tuning and delivery of a high volume, low vacuum extraction skid specified by an alpha-client.  They requested a sub-slab depressurization unit capable of maintaining a 0.2″ WC vacuum in an adjacent monitoring point.  The feasibility-study established the operating flowrates and induced vacuum.  A radial blower on variable frequency drive (VFD) was selected and tuned via a PID loop to eliminate the VOC intrusion into the operating office complex.

The low RPM (therefore low noise), low vacuum blower has eliminated the VI issue and rendered the structure useable to the office staff.  The pilot-study results decreased proposed blower size, thereby the reducing electrical inputs of an ill-conceived design.

Frac-tank processing.

Wednesday, December 3rd, 2008

ReRem Equipment Corp. was recently contracted to provide water process setup and rental services for a repeat customer.  Our services included mobilization, equipment set-up, training of site personnel in start-up / operation / shut-down procedures, and demob / cleaning upon completion.  The rental duration was 2.5 weeks with a total volume of 55,000 gallons processed.  The cost per gallon was $0.11, or 10% of the typical alternative (trucking).

Laboratory analysis of the tray-stripper effluent was consistent with the NEEP modeler output.  Carbon was required by STATE Regulators, yet no contaminants reached the carbon beds.

COSTS: NEEP 3631 ($1500/week), mileage ($1/mile), Labor ($75/hour), bag filters ($8/each).