Lake Arrowhead Community Services District New Production Wells Project - Addendum No. 1

Lake Arrowhead Community Services District New Production Wells Project - Addendum No. 1

The project consisted of the drilling, installing, developing, test-pumping and producing water from several test wells within the District's service area. This document focuses on 2 of the test wells, Well No. 6 (Site A-1 in the adopted MND) and Well No. 8 (Site A-3), which have been selected for conversion to production wells based on the volume of water produced by these wells and the quality of the water. Well No. 6 was drilled to a deph of about 700 ft and produces ~40 gpm. Well No. 8 was drilled to a depth of about 500 ft and produces ~50 gpm. This Addendum serves as the basis for this second tier environmental review of Wells No. 6 and No. 8 of the original project, which consists of conversion of these 2 wells to production status. In summary, the changes being considered for the original project consist of: Convert existing test wells No 6 and No. 8 to production well and install the permanent pumps; Connect the wells to the existing distribution system by installing connecting pipelines, each line ~1,000 ft in length; Treat and deliver ~100 acre-ft per yr to the District's potable water distribution system; Modify the District's water purbeyor permit to incorporate the groundwater from Wells No. 6 and No. 8 as a new water supply source.

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