Here is the  Plan:

1. Arrive Friday 0:30pm, I can arrange a private car to pick up you guys from the airport to your hotel, if you would like, you have to pay for the car about 150RMB. It's a little late.

2. On Saturday , we can take the same private car to the the Terracotta Army in the morning at 7:30AM from your hotel, if you would like, you have to pay for the car about 230RMB for a round trip.?

3.Taking the same private car will take you about 30-40 minutes from the city to the Terracotta Army. We will arrive at Terracotta Army ?at 8:10AM.(The Terracotta Army open time is 8:30 AM )

4.You can visit the Pits for 30 minutes,there are 3 pits in the the Terra cotta Army, take some pictures and leave at 9:20AM.?

5.We take the private car go back to the Train Station at 10:00 AM, and then we take the train G2006 (starts time at 10:25am). We will arrive at Mount Hua at 11:00 AM.?

6. After you climbing down the Mount, we can sleep in a hotel close to Mount Hua to get enough time and leave for the Airport on Sunday morning.

On Sunday 

1. We go back to XIAN Train Station in the morning. we take the train D307 (starts time at 07:53 am ). We will arrive in XIAN at 8:36AM.

2. I can arrange a private car to pick up the guy to the airport, if you would like, you have to pay for the car about 150RMB.