The on site stabilization procedure is shown in Table 2.
On the site, the treatment process was divided into three different layers, as judged by the
heavy metal content and different amounts of minerals. Chowdhury et al. [26] reported
a lead contamination site. Phosphate was used as a remediation agent. The contents of
phosphate are distinguished by lead concentrations. 2.5% phosphate was added to the site
containing less than 5000 mg/l of lead. For the soil containing more than 5000 mg/l of lead,
5% phosphate was added to the site as stabilization agent. The Ca(H2PO4)2 and CaCO3 to
soil weight ratio is listed in Table 3