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� 2280 French Creek Circle - Septic Problem �May 31, 1991 Page 2 of 2 Also, Steve Schirmers did a quart jar sand test during our inspection today and found that the sand sample from various depths of the sand bed does meet the cleanliness requirements for mound sand. In excavating in the rockbed, there was evidence that some of the rock may have been dirty and there is the possibility that fine particals originally attached to the rock because it wasn't clean, have filtered to the top of the sand bed and caused a clogging layer. Also, another problem with the mound system is that there is no loam or loamy sand cap with normal top soil above the rockbed. The materials above the rockbed are clay loams and loams. Also, while there was some evidence that a Iayer of hay had been placed over the rockbed, in approximately 4 borings into the rockbed we found no evidence of a building paper layer. However, the heavy consistency of material overlying the rockbed suggests that there may not have been a tendency for that material to slough into the rockbed. This suggests that the rock originally used may have been dirty. 3. Regarding the sand below the rockbed, this sand during normal probing appeared to be rather compacted, as compared to what one would find in a normal sand situation. There is possibility that the sand layer itself was compacted and may have some effect on limiting its permeability. 4. At the manhole opening to the pump tank, the ground surface is at a Iow point relative to its surroundings, and during spring runoff and heavy rains, it is very possible that runof f water i s entering the pump tank through the manho 1 e or inspection riser opening. An easy solution to this problem would be to regrade the yard directly west of the pump tank so that positive drainage away from the manhole is accomplished. 5. Steve Schirmers was able to check inside the house today to determine whether there were obvious extraneous flows into the system or whether the water softener or air conditioner were discharging an inordinate amount of water into the tanks. During the time we had the pump tank open there was a continuous stream of water approximately the diameter of a pencil flowing into the pump tank from its inlet. Even when nobody appeared to be home and no water use was occurring, this flow continued into the pump tank. This memo is merely to document today's inspection and additional followup on this problem mound system will be occurring.