Contamination event of concern: Large spill of leaded gasoline that infiltrated the soil and may have contaminated groundwater.

Soil type: Gravel/loam mixture, slightly acidic, presence of large stones/boulders. Low cation exchange capacity and water holding ability.

To delineate the extent of contamination in the soil, what sampling plan would you use and why? b) To determine if the groundwater has been contaminated, what sampling plan would you use and why?