Read the following email message. Complete the email by filling in the blanks. Select the best choice for each blank.

Dear Construction Team Lead, I'm writing regarding the new aqueduct project. According to the guide, we need to ensure the main channel has 1....... The support structures are crucial - we'll need to dig the ground-level supports to 2...... and space the elevated arch pillars exactly 3...... apart. I'm particularly concerned about maintenance. The guide specifies that we need to install 4...... for regular access, and we must include settling tanks 5....... Please confirm these specifications before we begin construction next week. Best regards,Lucius

Choose the best option.

According to the guide, what is the primary purpose of the settling tanks? 1...... The guide indicates that the construction team must 2....... The distribution tank must be placed 3.......