You are tasked with taking soil samples from a potentially contaminated field with an area of 50 by 100 feet next to an abandoned chemical factory. There are suspected “hot spots” of chemical contamination within the field, especially around sheds where chemical drums were stored. You need to get a good survey of what chemicals are present, where they are, and their contamination levels. Name two potential probability-based sampling designs you might employ. Why would you consider these two sampling designs and how would they help you identify hot spots in the sample area? Assume that money is not a factor when conducting your study.