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contamination.
• NET RECHARGE (4) — the amount of water that enters the ground water system. Annual net recharge is dependent upon precipitation, evaporation of the moisture back into the atmosphere and runoff. With confined aquifers where a natural barrier inhibits water from reaching the water table, the recharge rate is lower.
• AQUIFER MEDIA (3) — the material which is saturated and yields enough water for use. The more porous the media, the quicker the movement of contaminants.
• SOIL MEDIA (2) — the area from the surface to six feet dowTn. The type of soil can determine the amount of time it takes a substance to move into the water table, and it can also influence the chemical breakdown of a substance when it first enters the ground.
• TOPOGRAPHY (1) — the percent and variability ol the slope of the land. This determines the rate of runoff and therefore the potential for a contaminant to enter the ground water. The steeper the slope, the more runoff there will be, allowing contaminants to escape in surface water rather than leach into the subsurface water table.
• IMPACT OF VADOSE ZONE (5) — the unsaturated material between the soil and the water table. The type of material and its density affects the travel time of contaminants and also aids in the breakdown process.
• HYDRAULIC CONDUCTIVITY (3) — the aquifer media’s ability to transmit water. This influences the rate at which a contaminant will be dispersed and the direction it will travel.
91.7%