Sandstone Pathway and ACO Drain wrongly fitted?

[happynuts95]

New sandstone pathway with ACO drain (semi detached house) was installed recently.
1) ACO drain end caps are missing. The worker told me it doesn’t need. Is it true? I worried some water will go to the soil pipe gap.
2) Find some water spots on the pathway surface in the morning. It rained at night. Is it normal?
3) The soil pipe area didn’t do any special handling and is not covered with anything, rain will go down. Did workers do it right? Should I buy the waste pipe cover (Picture 3)? Will it help preventing rain going down?
Thank you.
Jessica

 

[happynuts95]

4) Now the white kitchen extended waste pipe is on the top of ACO drain cover, water will splash out to the wall. I am thinking to cut a hole on the ACO drain cover and make the kitchen waste pipe vertical, so water can drop into the hole and drain. Workers said no need. Any suggestions? Thank you. Jessica