The objective of an aerially deposited lead (ADL) investigation is to evaluate soil for the presence of ADL due to  historical use of leaded fuels by freeway traffic. The data is collected from soil samples and submitted to laboratory testing for total lead analysis. Based on analytical results and statistical data evaluation, Earth Forensics designs and implements solutions that allow clients to effectively reuse soil on-site that comply with safety code thresholds and reduce the high cost of off-site transportation and disposal. 

Featured Project

Aerially Deposited Lead Investigation & Reclassification Program, Route 91, Orange and Riverside counties.  

Retained by the State to collect soil samples from 19 boring locations and analyze for total lead. Samples which exhibited concentrations of lead between 50 to 1,000 milligrams per kilogram (mg/kg) were analyzed to quantify soluble lead concentrations using USEPA Series 7000 methods, Waste Extraction Test (WET) with a citric acid buffer. Samples with greater lead concentrations were analyzed to quantify soluble lead concentrations using USEPA series 7000 methods with a deionized water buffer. Based on the analytical results and statistical data evaluation, Earth Forensics was able to divide the on-site reuse and off-site export into five scenarios based on soil locations and depths, and planned reuse.