The NGLA Map Series: sewer connection survey and production well nitrate analysis Guam Waterworks Authority General Manager Miguel Bordallo, P.E., speaks to the Rotary Club of Guam at its Thursday, 28 January meeting on “Protecting the Northern Guam Lens Aquifer (NGLA): GWA’s Actions for Water Resource Protection.” Mr. Bordallo described the system of 120 wells from which GWA produces 90% of Guam’s drinking water and cited WERI’s contributions to GWA’s aquifer protection efforts. His presentation cites results of ongoing work at WERI to document the incidence of nitrate contamination, and the spatial patterns…