In making a pH determination on soil, the sample is saturated with the dye for a few minutes and the color observed. This method is accurate enough for most purposes. Kits (pH) containing the ...

Proper soil sampling techniques are essential to obtain accurate soil test results. Purdue Extension publication HO-71 entitled Collecting Soil Samples for Testing provides specific advice on taking a ...

AASHTO R47-23 Reducing Samples of Hot Mix Asphalt (HMA) to Testing Size Exempt if qualified in Asphalt Module, taken within one year (doesn't apply for written exam) AASHTO T310-22 In-Place Density ...

It's been three months since the Eaton Fire burned through the Altadena area, and public health officials are warning about ...

Los Angeles County will be reallocating $3 million toward additional soil testing in the Eaton fire area. Here’s why.

Representative soil sample testing done in a Los Angeles County Public Health study found a higher percentage of samples with lead levels above health-based screening thresholds taken from parcels ...