25I - AGMT - OCWD ASSESSMENT - Laserfiche WebLink

Home Browse Search

CITY OF SANTA ANA Well No. 32 Nitrate Mitigation and Rehabilitation Study 4. WELL MODIFICATIONS 4.1 Well Head and Piping Modifications Well No. 32 has been inactive since 2004. The first action the City wants to perform is to rehabilitate the well and perform the following: • Chemical rehabilitation Mechanical rehabilitation Well development, testing and water quality sampling A video survey will first be performed to verify the rehabilitation techniques necessary to address the condition of the well casing. Currently, the well head for Well No. 32 is located within a buried vault. The City desires to raise the well head to meet current Department of Public Health recommendations for the construction of potable water wells. The well casing, tubes (sounding, gravel fill line, etc) and a new sanitary seal will need to be constructed to raise the well head to grade. The discharge piping will be reconstructed. Depending on the alternative selected will dictate the operational flexibility required to be designed at the well. It is anticipated the following new equipment will be required: Pump and motor • Piping Isolation valves • Check valve Motor operated throttling valves (one for discharge to blending site and one for discharge to system) Flow meter Surge protection (assuming a surge tank) • Nitrate monitoring equipment • Sodium hypochlorite disinfection system • Site improvements • Landscaping 4.2 Building Modifications One the well head is raised to finish grade, the underground vault will be demolished and a new building constructed to protect the well head and piping. The well is located at the entrance of Morrison Park. The building will match other City water facility buildings located within the City and will incorporate the following: Concrete slab -on -grade floor Concrete masonry unit walls and foundation Gabled roof Steel roof framing P:m00597a0WEnbn ring\os\ we11-32- Him. oe >nna+s.renme•eaePera02mxt.&251 1 TETRA TECH