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Luhdorff & Scalmanini <br />Consulting Engineers <br />July 22, 2020 <br />LSCE No. 20-2-099 <br />Mr. Darren Baune, PE <br />Carollo Engineers <br />2795 Mitchell Drive <br />Walnut Creek, California 94598 <br />SUBJECT: SCOPE AND BUDGET FOR HYDROGEOLOGICAL SERVICES TO SUPPORT <br />CITY OF PLEASANTON'S WELL 5, 6 & 8 WELL REHABILIATION PROJECTS <br />Dear Mr. Baune: <br />Luhdorff and Scalmanini Consulting Engineers (LSCE) is pleased to submit this scope defining engineering <br />services to provide assistance on the City of Pleasanton's (City) Well 5, 6 and 8 Well Rehabilitation and <br />PFAS Treatment Project (Project). LSCE has been helping the City with well related projects since 1991, <br />and we are currently reviewing LSCE records from previous work specific to Wells 5, 6 and 8. A <br />summary of previous work completed by LSCE is included in Table 1. <br />BACKGROUND <br />Well 5 — Carollo assisted the City in analysis of the Well 5 pump failure in early 2020. Part of the analysis <br />included review of video inspection of the casing and hydraulic performance of the Well 5 pump. Carollo <br />determined that minor repairs and cleaning to the casing was recommended as part of this Project. The <br />pump meets current demands but is underperforming (producing less flow than the factory pump curve <br />would suggest). The City plans to perform additional testing to validate the pumping capacity once the <br />well is put back in service. <br />Well 6 —The Water Quality evaluation identified that the pump is beyond its useful life and requires <br />replacement. The Well 6 casing has not been inspected sense installation and the City prefers to inspect <br />the condition of the casing. <br />500 First Street (530) 661-0109 <br />Woodland, CA 95776 www.lsce.com <br />