THIS IS A FOLLOW UP TO AN EARLER ARTICLE. I HAD A FIELD LINE FAILURE A FEW MONTHS AGO AND HAD A NEW SEPTIC LINE INSTALLED ABOUT 4 WEEKS AGO.
THE NEW FIELD AREA IS STILL GRADED CLAY WITHOUT ANY GRASS. THIS WIDE OPEN GRASSLESS AREA MADE IT EASY TO NOTICED A DAMP IMPRINT OVER THE START OF THE SECOND RUN; JUST PASSED THE OVERFLOW FROM THE TOP/FIRST LINE.
WE HAVE HAD A WEEK OF HEAVY RAIN AFETR I INSTALLED THE SYSTEM AND 2 WEEKS OF HOY DRY WEATHER.
ALL THE SOIL IS BONE DRY EXCEPT IN THIS ONE 3' X 10' AREA. THERE IS NO STANDING WATER BUT IT IS DAMP TO THE TOUCH. 
WE USED A 10" GRAVELLESS PIPE IN A 36" DITCH SURROUNDED BY A COURSE SAND. 20" OF CLAY MIXED SOIL COVERS THE TOP. THIS ONE SECTION MY BE A LITTLE SHALLOW DUE THE THE LAND SLOPING IN THAT AREA.
TIME FOR THE QUESTION -- HOW DAMP IS TOO DAMP???
I'M WONDERING IF IT'S DAMP IN 95 DEG WEATHER WHAT HAPPENS DURING THE WINTER MONTHS?
OR THIS IS NORMAL AND WOULDNT BE NOTICED IF GRASS WAS ESTABLISHED?
AGAIN - MANY THANKS !!!