Environmental Enlightenment #98
By Ami Adini -
Reissued March 8, 2017

This is a SHORT, LIGHT and SIMPLE newsletter. Its purpose is to rekindle in the initiated concepts they have once learned, and enlighten the uninitiated on concepts they may have never heard of, but will understand once they are introduced to them.

Environmental Investigations in Dry Cleaning Operations
Contaminant Source Areas - Where to Sample III

(The information in this newsletter has been gleaned from an EPA sponsored site http://www.drycleancoalition.org and enhanced with images.)

This info-letter is one of a series on drycleaning operations, their impact on the environment and hurdles they pose in real estate transactions. Search here for more.

Sanitary Sewer - Septic Tank/Drainfield

The sanitary sewer and septic tank/drainfield have historically been popular disposal points for contact water. Some older drycleaning machine service manuals even prescribed discharging contact water to drains.

Sewer lines in urban areas can be constructed from a wide variety of materials. Within a city, many different kinds of sewer piping may be utilized depending on the time period the sewer lines were installed. Older sewer lines are made of cast iron and vitrified clay and newer lines have been constructed from concrete or more recently thermoplastic.

Manholes were typically constructed of brick/mortar and concrete.

Early sewer line joints were sealed with mortar and bituminous compounds. Neither of these materials is watertight and subsequent settling and cracking have provided pathways for contaminant migration.

Many local sewer authorities specify permissible leakage rates for newly-constructed sewer lines “of approximately 500 gallons per inch diameter per day per mile.”

Contact water, free-phase solvent and solvent vapors can leak from sewer lines through cracks, joints or breaks. Contact water and free-phase solvent can also leach through sewer piping.

The more modern PVC-made sewer piping materials are not compatible with dry-cleaning solvents. There's ample evidence of PVC sewer piping being corroded and deformed by the action of dry-cleaning solvents.

Soil-gas sampling along sewer lines can be used to delineate contamination associated with leaking sewer lines.

(The information in this newsletter has been gleaned from an EPA sponsored
site http://www.drycleancoalition.org and enhanced with pictures obtained from the Web.)

You can find past issues of "Environmental Enlightenment" at www.amiadini.com Wealth of information about environmental site assessments in the real estate transactions and issues concerning assessment and cleanup of contamination in the subsurface soil and groundwater.

Call me if you have any questions. There are no obligations.

Ami Adini Environmental Services, Inc.
Environmental Engineering Consultants & Contractors
Underground Storage Tank Experts
California Lic. #1009513 A B HAZ ASB
818-824-8102; mail@amiadini.com

Ami Adini is a mechanical engineer, California Registered Environmental Assessor, Level II (Exp.), and president of AMI ADINI ENVIRONMENTAL SERVICES, INC. (AAES), an environmental engineering consulting firm and general contractors specializing in all phases of environmental site assessments, rehabilitation of contaminated sites and upgrading of underground storage tank facilities. AAES provides practical solutions to environmental concerns using the highest standards of ethics and integrity while providing its clients with maximum return on their investments.