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c� feet at the injection well site shown on Exhibit No. 2. These layers are shown in yellow and light brown. In contrast, water wells in and around the PSE property draw fresh-water from strata at depths less than 300 feet, as shown in blue. This results in a difference of over 4, 000 feet between the depth of injection and the groundwater supply. As mentioned above, these sandstone layers have been penetrated by exploratory wells drilled by the petroleum industry in search of hydrocarbon accumulations. Referred to as the Azevedo and Blewett sands, these sandstone layers have long been recognized by the industry for their reservoir and storage capabilities. Composed of medium sized sand grains, typical of a coastal beach sand, these sand beds are 150 and 300 feet thick, respectively. Measurements show approximately 251. to 300 of these sandstone layers are comprised of pore space between the sand grains. It ( _ will be into these pore spaces that the waste fluids will be injected for permanent storage. Confinement of the waste fluids to these sands is achieved by the presences of a shale bed over the top and ends of these sandstone layers. Composed of minute clay particles, the shale beds have little or no interconnected pore space between the particles. This will effectively prevent any passage of fluid through this layer. Clay is characteristically impervious to fluid migration and will act as a seal to confine the waste fluids to the zone of injection. It is this same natural ability of clay to confine _ liquids that has permitted the entrapment and containment of naturally occurring accumulations of oil and gas for millions of years. One such confining layer shown in gray on Exhibit No. 2, is about 100 feet thick and lies directly over the top of the Azevedo. A / second layer, 400 feet thick, seals off the updip eastern end of the sandstone beds. These confining layers are known from deep WILSON ZUBLIN INC.