ITEM 5 EXHIBITS A-H - Laserfiche WebLink

Site Corrosivity Evaluation 4400 Black Avenue, Pleasanton, CA JDH Corrosion Consultants, Inc. 2 Discussion Reinforced Concrete Foundations Due to the low levels of water-soluble sulfates found in these soils, there is no special requirement for sulfate resistant concrete to be used at this site. The type of cement used should be in accordance with California Building Code (CBC) for soils which have less than 0.10 percent by weight of water soluble sulfate (SO4) in soil and the minimum depth of cover for the reinforcing steel should be as specified in CBC as well. Underground Metallic Pipelines The soils at the project site are generally con moderately corrosive ductile/cast iron, steel and dielectric coated steel based on the saturated resistivity measurements. Therefore, special requirements for corrosion control are required for buried metallic utilities at this site depending upon the critical nature of the piping. Pressure piping systems such as domestic and fire water should be provided with appropriate coating systems and cathodic protection, where warranted. In addition, all underground pipelines should be electrically isolated from above grade structures, reinforced concrete structures and copper lines in order to avoid potential galvanic corrosion problems. LIMITATIONS The conclusions and recommendations contained in this report are based on the information and assumptions referenced herein. All services provided herein were performed by persons who are experienced and skilled in providing these types of services and in accordance with the standards of workmanship in this profession. No other warrantees or guarantees, expressed or implied, is provided. We thank you for the opportunity to be of service to Cornerstone Earth Group on this project and trust that you find the enclosed information satisfactory. If you have any questions, or if we can be of any additional assistance, please feel free to contact us at (925) 927-6630. Respectfully submitted, Brendon Hurley JDH CORROSION CONSULTANTS, INC. Field Technician ductile/cast iron, steel and dielectric coated steel based on the saturated resistivity ductile/cast iron, steel and dielectric coated steel based on the saturated resistivity measurements. Therefore, special requirements for corrosion control are required for buried measurements. Therefore, special requirements for corrosion control are required for buried metallic utilities at this site depending upon the critical nature of the piping. Pressure piping metallic utilities at this site depending upon the critical nature of the piping. Pressure piping systems such as domestic and fire water should be provided with appropriate coating systems systems such as domestic and fire water should be provided with appropriate coating systems and cathodic protection, where warranted. In addition, all underground pipelines should be and cathodic protection, where warranted. In addition, all underground pipelines should be electrically isolated from above grade structures, reinforced concrete structures and copper electrically isolated from above grade structures, reinforced concrete structures and copper lines in order to avoid potential galvanic corrosion problems. lines in order to avoid potential galvanic corrosion problems. LIMITATIONS LIMITATIONS The conclusions and recommendations contained in this report are based on the information and The conclusions and recommendations contained in this report are based on the information and assumptions referenced herein. All services provided herein were performed by persons who assumptions referenced herein. All services provided herein were performed by persons who are experienced and skilled in providing these types of services and in accordance with the are experienced and skilled in providing these types of services and in accordance with the standards of workmanship in this profession. No other warrantees or guarantees, expressed or standards of workmanship in this profession. No other warrantees or guarantees, expressed or provided. provided. We thank you for the opportunity to be of service to We thank you for the opportunity to be of service to trust that you find the enclosed information satisfactory. If you have any questions, or if trust that you find the enclosed information satisfactory. If you have any questions, or if we can be of any additional assistance, please feel free to contact us at (925) 927-we can be of any additional assistance, please feel free to contact us at (925) 927-