Eco Brooklyn is gearing up for it Spring Soil Remediation Projects. A potential client has sent us their Soil Testing Report and it was time to refresh our knowledge on key components of soil contamination and remediation.
The level of contamination in their report will require root barriers and the addition of six inches of topsoil.
According to the Environmental Sciences Analytical Center at Brooklyn College It is not uncommon for many New York City gardens to have contamination. The dense urban environment has contributed to an overabundance of metals including: Lead, Chromium, Nickel, Arsenic, and Cadmium.
Prior to the 1980’s heavy metals were used primarily in manufacturing processes. Lead is one of the most abundant toxins that contributes to soil contamination, and was commonly found in paint, print making ink, fertilizers and gasoline.
Chromium is another substantial toxin found commonly in Brooklyn soil. The element was widespread in the production of paint, tanning salts, car parts, and plumbing fixtures.
Heavy metal poisoning often results in birth defects, autism, allergies, weight loss, and even paralysis.
The chart above, from California’s Environmental Protection Agency, displays the safe levels of the most common heavy metals found in soil. The second column displays the levels for which the California Office for Environmental Health deems safe for soil use, such as gardening, while the EPA suggests a significantly higher threshold in the third column.
The State of New York does not currently have specific guidelines or regulations for garden soil. If you own a brownstone or home in Brooklyn you can bet your soil has toxic levels of heavy metals.
Testing for contamination is a simple and inexpensive process at Brooklyn College. Just visit their Soil Testing Website, and follow the five easy steps to receive a Soil Test Analysis and/or a Tissue Analysis of your fruits and vegetables.
Eco Brooklyn recommends following the European ECO Label threshold for heavy metals. Soil containing lead above 100 parts per million should be mediated and it is crucial to apply these standards when children are involved. Green building starts with designing a good foundation whether it involves sustainably sourced wood studs or a contamination free lot to build upon.