The generator matrix

 1  0  1  1  1  1  1  X  1  1  1  1  1  1 2X  1  1  1  1 4X  1  1  1  1 3X  1  1  1  1  1
 0  1 3X+1  2  X 4X+1 X+2  1 3X+4 4X+4 2X 2X+1 2X+2 2X+4  1 4X X+1 4X+2 X+4  1 3X  1 3X+2  4  1  3 X+3 2X+3 4X+3 3X+3

generates a code of length 30 over Z5[X]/(X^2) who´s minimum homogenous weight is 120.

Homogenous weight enumerator: w(x)=1x^0+600x^120+24x^125

The gray image is a linear code over GF(5) with n=150, k=4 and d=120.
This code was found by Heurico 1.16 in 0.00228 seconds.