EXHIBIT 4

REFERENCE DOCUMENTS

1. DeKalb County Department of Watershed Management, Potable Water Main, Gravity,

Sanitary Sewer, and Sanitary Sewer and Force Main Design Standards, 2017 edition,

Version 1.0

2. American National Standard by the Hydraulic Institute: Pump Intake Design (ANSI/HI

9.8 – Latest edition)

3. American National Standard by the Hydraulic Institute: Rotodynamic Centrifugal Pumps

for Manuals Describing Installation, Operation and Maintenance (ANSI/HI 1.4- Latest

edition)

4. American National Standard by the Hydraulic Institute: Rotodynamic Centrifugal Pumps

for Design and Application (ANSI/HI 1.3- Latest edition)

5. American National Standard by the Hydraulic Institute: Rotodynamic Pumps for

Hydraulic Performance Acceptance Tests (ANSI/HI 14.6- Latest edition)

6. NFPA 820: Standard for Fire Protection in Wastewater Treatment and Collection

Facilities

RFP# 17500472 DBS for Scott Candler Water Treatment Plant HSPS Header and Transfer Pumps Replacement