The most difficult aspect of cleanup is identifying what needs to cleaned up. The initial process is easy, anything with staining, or a foul odor can easily be removed. However, chemicals can still have adverse health effects when you can't even detect the chemical through olfactory senses. As such, identifying contaminated areas beyond gross contamination through laboratory analysis is the only way to ensure nothing that poses a risk remains. This takes time and a lot of energy in the field, collecting samples, storing them, submitting them to a lab, etc. Then you have to wait for results before you can act. Once you have delineated the unseen contamination, you may begin to fully remediate the site.

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Everything currently recommended in the workplan for the site is what I would normally recommend in this scenario, however, I can't offer any specific advice without seeing the raw data collected for soil and groundwater data in the area, which is not currently publicly available.