16-0301 v2.1/Frick Environmental Center/Tree whips, seed and minerals sourcing


We are seeking approval to zone jump pertaining to the original source of three Division 32/Zone 1 items for our site, located in Pittsburgh, PA. 

-We have contract grown native trees for our site with a local nursery to assure acclimation of the trees and soil type compatibility. Additionally, this reduces the distance heavy materials are transported to the site. However, our nurseryman has identified his original source of these seedlings/whips, which he orders by truckloads of 3500, to be from Oregon. We are purchasing 178 (roughly 5% of a truckload) of these trees, which will have grown on his site for the past 3-5 years. 

-Additionally, we have been able to source 4200 locally grown herbaceous perennials and purchase 340 lbs. of native grass seed within the prescribed zone for our project. Unfortunately, 5 lbs. of bagged Purple Lovegrass seed, although native to the Northeast, needs to be purchased from Houston County, MN. We have exercised due diligence in attempting to procure these products within Zone 1. 

-In line with the effort to avoid petrochemical soil amendments, we want to incorporate Phosphorus and Potassium into our soils. These minerals are not sourced from within one zone of our site. The reference guide has a footnote allowing Div 32 irrigation products to be sourced from Zone 5. We are asking, given our approach for this park project, to be able to include these sections from Div 32 in same exemption.


Per Exception I14-E9 Seed Mixes, seeds do not need to be tracked. Therefore, the 5 pounds of bagged Purple Lovegrass seed are exempt from tracking and are not zone restricted.   Tree whips and seedlings, as well as minerals, can be addressed using Exception I14-E13 Function per the v2.1 Materials Petal Handbook, (p 25). Essentially, if items serve specific functions and cannot be replaced using substitutes available within the appropriate Zone, then Zone jumping is allowable. Please note that Due Diligence Documentation is required when utilizing this Exception, as described in Table 6 I-14 Documentation Summary. Additional Due Diligence Documentation is required for each Zone jump. The above items cannot be part of the irrigation component Zone 5 allowance. Plants for Living Buildings are to be native or adaptive species and, therefore, should not need to be sourced from distant locations, while irrigation systems are manufactured and sometimes require specialized components, which may not be available locally, to meet water efficiency goals. Minerals, like potassium and phosphorus, should also be commonly available within Zone 1.

Post ID 4318

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