CDPH Lead Inspector/Assessor California State Practice Exam

What is the requirement for field blanks in multi-family assessments?

1. One for every sample collected

2. One for every 10 units

3. One for every 20 samples collected

4. Two per property

The correct answer is: One for every 20 samples collected

In multi-family assessments, the requirement for field blanks is established to ensure the accuracy and reliability of lead sampling results. The preferred practice is to have one field blank for every 20 samples collected. This helps to detect any potential contamination that may occur during the sampling process, allowing for a more reliable interpretation of the lead levels found in the samples taken from the various units. By collecting one field blank for every 20 samples, inspectors can effectively monitor the integrity of their sampling methods and ascertain whether cleaning protocols and handling practices are adequate to prevent contamination. This systematic approach makes it easier to identify any potential issues in the sampling process since field blanks serve as control samples that should show no detectable lead if the sampling and handling processes are correct.