Laserfiche WebLink
Based upon the above described analyses, it was advised that the <br /> moisture content of the on-site sands be reduced to 4 percent or <br /> less, and SC-3000 liquid asphalt be added to the mixture in <br /> amounts equalling 4 to S percent. The reduced moisture will <br /> provide a more stable mixture during the initial handling and <br /> should minimize the period of curing required prior to final <br /> placement and compaction. Stability was compromised somewhat in <br /> the interest of durability, flexibility and workability. <br /> However, a chip seal topping could be added to improve durability <br /> after curing. <br /> ENVIRONMENTAL TESTING <br /> The experimental pavement samples were prepared from the <br /> stockpiled-sands contaminated with residual fuel oil and control <br /> samples were prepared from "clean" sands. The samples were <br /> analyzed to determine whether they contained toxic constituents <br /> and specifically whether they would be regulated as hazardous <br /> substances in California. The California toxicity criteria are <br /> mire encompassing than the RCRA criteria. They include: <br /> o Limits on specific carcinogens (including some PNAH <br /> compounds) <br /> o Limits on heavy metals, similar to the RCRA EP Toxicity <br /> test <br /> O Bioassay testing. <br /> The experimental and control samples were tested fcr PNAH <br /> content, heavy metals content, and were submitted to bioassay <br /> testing in accordar.�e with California Code of Regulations (CCR) , <br /> Sections 66696-6667Co. The test results indicated: <br /> o The asphalt pavement produced from fuel oil <br /> contaminated sands represented no greater environmental <br /> risk than pavement produced from clean sands. <br /> o Neither asphalt pavement would be classified as a <br /> hazardous waste pursuant to existing California <br /> regulations. <br /> PNAH Analyses <br /> } <br /> The samples were extracted with methylene chloride in a soxhlet <br /> thimble in accordance with EPA procedures for extracting semi- <br /> volatile and volatile organic compounds from sold_.mat.er.ials__(.ss,1 <br /> -----_846,-Method 8.86)-. - - - --- -- -The control sample yielded 78.2 milligrams of extractable <br /> �1 hydrocarbon per gram of sample. The samples were analyzed b <br /> Y y high <br />