ATT 4 Specifications for Testing Aggregate April 2021.pdf
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- Solicitation number
- 12363N25Q4046
- Issued by
-
Department of Agriculture Forest Service
About this file
This document is a specification detailing requirements for testing aggregate or rip rap materials for lead content, specifically for the Mark Twain National Forest road improvement project. The Forest Service mandates testing of aggregate or rip rap sourced from specific counties in Southeast Missouri (Crawford, Dent, Shannon, Washington, Iron, Reynolds, Madison, St. Francois, St. Genevieve, and Bollinger) to prevent hazardous mineralization from being placed on National Forest System Lands. Materials must be visually inspected to ensure no hazardous minerals like galena, sphalerite, and chalcopyrite are present, with additional sampling required for materials containing particles smaller than 2mm to verify lead content does not exceed 100 parts per million.
The testing can be conducted through two approved methods: Core or Scoop Sampling following ASTM Standard E1727 with SW-846 analytical methods, or XRF Screening using UNE-EN ISO 13196. The number of required samples or screenings varies based on material quantity: 3 samples for 0-100 tons, 5 samples for 101-500 tons, and 10 samples for 501-1000 tons. Contractors must provide sampling or screening results in writing to the Contracting Officer Representative prior to material delivery, and must include documentation proving the source of materials if sourced from counties not listed in the specification.
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Specifications for testing Aggregate or Rip Rap for lead
April 28,2021
The Forest Service has developed the following contract requirement to prevent hazardous materials (from naturally occurring minerals) from being placed onto National Forest System Lands. Certain mineralization containing hazardous materials is found within formations in Southeast Missouri.
Any aggregate or rip rap sourced from any the following counties in southeast Missouri will need to be tested: Crawford, Dent, Shannon, Washington, Iron, Reynolds, Madison, St. Francois, St. Genevieve, and Bollinger Counties. If aggregate or rip rap is sourced from a county not listed, it will not have to be tested, however contractor must provide tickets or invoices that clearly show where those materials were sourced from.
Materials from these areas should be visually inspected to ensure that no hazardous mineralization is present. Mineralization including galena, sphalerite, and chalcopyrite should not be present in any materials placed on National Forest Systems Lands. Aggregate and/or rip rap that does not contain material in the <2mm fraction (passes a #10 sieve) may only need to be subject to visual inspection. Aggregate and/or rip rap that contains material in the <2mm fraction (passes a #10 sieve) will need to be sampled to ensure that the material does not exceed 100 parts per million (PPM) for lead (Pb). The methods and equipment used for sampling materials will vary with the form and consistency of the materials to be sampled. Samples collected using the sampling protocols listed below will be considered by the Agency to be representative of the material. Sampling or screening results should be provided in writing to the Contracting Officer Representative (COR) prior to any material being delivered.
Core or Scoop Sampling - ASTM Standard E1727 All extraction and analytical methods must follow the SW-846 compendium
OR
XRF Screening - UNE-EN ISO 13196
Number of Samples Required, based on quantity required in the schedule of items
Tons # of Samples/ Screenings 0-100 3
101-500 5 501-1000 10
Examples of hazardous minerals are shown in the following images
Figure 1 – Galena cube
Figure 2 - galena cubes in red circle
Figure 3- Sphalerite crystals
Figure 4 - Galena (red circle) and Sphalerite (yellow circle)
File details come from the government source that posted it. Updated .