FIG. 1 is a front perspective view of a septic chamber showing my new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a left side elevational view thereof;
FIG. 7 is a rear elevational view thereof; and,
FIG. 8 is a front elevational view thereof.
Broken lines illustrate portions of the septic chamber that form no part of the claimed design. Additional broken lines show a symbolic break in length where the appearance of any portion of the septic chamber between these break lines forms no part of the claimed design.