Previous research has suggested that when the percentage of
impermeable surfaces in a watershed is 10 percent or less, streams typically retain good water quality and stable channels.
Violations at the second location included failure to follow lead-safe work practices as required by the RRP rule; failure to post signs clearly defining the work area and warning occupants and other persons not involved in renovation activities to remain outside of the work area; and failure to cover the ground with plastic sheeting or other disposable
impermeable material extending 10 feet beyond the perimeter of surfaces undergoing renovation.
The LiteEarth system provides long-term protection that is
impermeable to air, gas and water, at a fraction of the cost of traditional natural grass capping.
City gardeners in particular should find a lot of useful information in this book, touted as the first ever to describe how to grow plants directly on pavement, rocks, tables, and other
impermeable platforms.
But Grotjahn's taste for the
impermeable is hardly delivered straight from the shoulder; a perverse formalism is his delicious decoy, both an homage to and usurpation of (by now amply deconstructed) modernist tactics.
Adult patients with asthma and allergic rhinitis who encased their mattresses, pillows, and quilts in covers
impermeable to dust mite allergen had no greater improvement in symptoms at 1 year than did patients with standard, cotton/polyester bedovers, two large randomized, double-blind European studies revealed (N.
The British study involved 1,122 adults with asthma who received home visits from a research nurse who fitted their beds with covers
impermeable to dust mites or standard polyester-cotton blend covers: No special instructions were given about washing the covers or other bed clothing, nor about other standard allergen avoidance measures.
They, after all, can be the most
impermeable barriers encountered.
Impermeable covers were not removed from the mattress, if present.
Vectran LCPs are highly
impermeable to oxygen, water vapor, and aromas, which allows them to be used in very thin layers of only 2 to 5 microns (0.
2 500 m 2 , In-situ concrete concrete slab
impermeable to water including recess 30-40 cm approx.
