Projects Southwest


Project Details
CLIENT   City of Tempe
DATES  Dec. 2014 – May 2015
TASKS  Well installation and testing

Matrix was contracted by Wilson Engineers, LLC to permit and provide professional oversight services for drilling and installation of City of Tempe Well #16 which was to be located near a busy street in close proximity to existing commercial, retail, and residential development. Matrix hydrogeologists provided construction oversight, documented all drilling and testing operations and determined the optimal screen and filter pack design following analysis of drill cuttings, downhole geophysical logs, and zonal water quality samples.

The challenge in designing this well was to avoid portions of the aquifer having elevated concentrations of arsenic. In addition, sound barriers were utilized and dust control measures implemented to minimize the impact of well construction and testing activities on nearby businesses and residents. Step-rate and constant-rate discharge testing at rates of 3,600 to 4,000 gallons per minute (gpm) resulted in minimal water level drawdown. The quality of groundwater pumped from the newly installed production well met safe drinking water standards for primary Maximum Contaminant Levels (MCLs) for all constituents analyzed.