Speculation Alert!
Around Noon
NUA: I can't reach Shanann. Do you know where she is?
CW: She is at a playdate with some vague friends.
NUA: Can't be. She missed her dr's appointment this morning. Her car is here in the garage.
CW: Oh, I asked her for a separation. Please just go home.
NUA: You need to come home. I'm calling the police right now.
Noon-1 pm
Hmm... Perhaps Shanann was buried in the morning, then he ran out of time before he had to go to work. He had planned to bury the babies during lunch time. Then at noon NUA called so he had to quickly drop the girls in the tanks before going home. No time to dig.
1pm
CW rushes home blowing every stop signs.
1:40 pm
Police arrives. Since this is a wellfare check, and not a 911 call, it takes a while for them to repond.