Patent ID: 7997031

Claim:
A method of providing an internal cover member for an access passageway in an on-site waste disposal system, comprising: forming a riser pan member to include a substantially cylindrical body portion having an upper portion and a lower portion, having disposed therebetween an annular ring; the upper portion including a generally vertically-aligned wall adapted to receive a passageway component thereon; and the lower portion including an integral pan portion having a generally frustro-conical shape; seatably receiving an internal cover member in the integral pan portion; incorporating the riser pan member into an access passageway in an on-site waste disposal system; forming the riser pan member to include a substantially circular standing rib member mounted to the annular ring, the standing rib member formed to have a substantially vertical outer surface and an inclined inner surface such that the inclined inner surface has an angle of incline greater than that of the frustro-conical shaped integral pan portion; and using the riser pan member as a form member to cast in concrete the internal cover member, whereby the resulting cast concrete internal cover member is formed with a stepped peripheral edge profile to be readily centered and positioned when seated in the integral pan portion of the riser pan member.