2022-114-E-Plannng-Schnabel Engineering South-Contract Amendment #1 – Lake Orange Gate and Spillway Channel Repairs

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Orange County Lake Orange Intake Tower Additional Services Project 20P21019.01 / January 25, 2022 Page 3 Schnabel Engineering South, P.C. calculate the depth to each reinforcing bar we observe, but rather to calculate a typical depth and note typical variances, and identify locations that deviate from this. Upon completion of the GPR survey we will prepare a memo summarizing the GPR survey procedures and results. Based on the rebar configuration observed we will include in the memo a qualitative assessment of the structural adequacy of the intake tower or provide recommendations on structural analyses that could be done to confirm the adequacy of the intake tower to withstand hydraulic and gate loads. It is our understanding that it is likely funds associated with our current contract could be re- allocated to perform these analyses. LIMITATIONS  Progress of on-site work may be dependent upon weather and reservoir conditions, or other factors beyond our control.  We may not be able to identify all the reinforcing steel. In particular, steel at the edges of intake tower may not be under the path of the GPR antenna sufficiently to detect it. In addition, the ability to see steel at depth will be dependent on which frequency antenna we can use (based on available space) and the amount the GPR signal attenuates in the concrete.  The effectiveness of the proposed geophysical methods is dependent on many environmental factors; results from these methods may vary depending on actual site conditions. EXCLUSIONS Services not specifically identified above are not included in the scope of services under this agreement. The following services are not included in our proposed scope, but we can be provide a proposal for these services upon request:  Hydrologic and hydraulic analyses of the dam;  Structural or stability analyses of the intake tower or auxiliary spillway;  Preparation of breach inundation mapping and an Emergency Action Plan (EAP);  Preparation of an Operation and Maintenance (O&M) Manual;  Environmental studies or permitting;  Surveys; and  Attendance at meetings. SCHEDULE The work detailed herein will be performed at a time agreeable to both parties and when the reservoir level and weather conditions will allow. FEES Our lump sum fee for the Task 6 services described herein is $11,000. The fees for work requested beyond the scope of services included herein will be based on our current unit prices at the time the work is authorized or a negotiated lump sum. Services will be billed for the lump sum fee upon completion of scope of services detailed herein and delivery of the deliverable. DocuSign Envelope ID: 3667B243-40E4-479A-AE63-F797402CD54A