Abstract
The study assessed and compared the groundwater quality of 14 selected wells continuously used in the with (Payatas) and without dumpsite (Holy Spirit) areas at the Payatas estate, Philippines. Water quality monitoring and analyses of the bio-physico-chemical variables (pH, Total Suspended Solids (TSS), Total Dissolved Solids (TDS), total coliform, conductivity, salinity, nitrate-nitrogen, sulfate, color, total chromium, total lead and total cadmium) were carried out for six consecutive months, from April to September 2003, covering both dry and wet seasons. Results showed most of the groundwater quality variables in both the with and without dumpsite areas of the Payatas estate were within the normal Philippine water quality standards except for the observed high levels of TDS, TSS and total coliform and low pH levels. No significant differences were observed for nitrate- nitrogen, total cadmium, total lead, total chromium and total coliform in both the with and without dumpsite areas. TDS, conductivity, salinity and sulfate concentrations in the with dumpsite groundwater sources were significantly different compared to those in the without dumpsite areas. Continuous water quality monitoring is encouraged to effectively analyze the impact of dumpsites on the environment and human health.
Highlights
The 15-ha Payatas open dumpsite is within the Payatas estate located at the northeastern district of Quezon City, Philippines
The study areas are characterized as flatlands that meter SP-2200 (Suntex Instruments Co., Ltd., Taipei, rise to an elevation of about +95 mean sea level at Taiwan), Total Suspended Solids (TSS) using the the northwest margin of the Marikina River watershed. gravimetric determination[4], color determinations using The with dumpsite area is positioned along the the HACH spectrophotometer DR/2010
Loveland, Colorado, USA) and Total and at the eastern edge of the Novaliches Reservoir, Dissolved Solids (TDS) and conductivity using the whereas the without dumpsite area is along the HACH Conductivity-TDS meter (HACH Company). northwestern ends of the Guadalupe Plateau Formation
Summary
The 15-ha Payatas open dumpsite is within the Payatas estate located at the northeastern district of Quezon City, Philippines. The Payatas dumpsite is situated half a kilometer southeast of the Novaliches Reservoir, the main source of drinking water for Metro Manila. Garbage dumped and accumulated for several years at the Payatas open dumpsite had been identified as a potential threat to the metropolis water supply. Bacud et al.[1] reported that the acidification and the presence of nitrates and coliform bacteria found in the groundwater along the dump may be traced to the Payatas open dumpsite. There have been no in-depth studies yet concerning groundwater quality along and within the Payatas dumpsite, many sectors, including some environmentalist groups, had expressed serious concerns that the Novaliches Reservoir is contaminated with toxic substances beyond safe concentrations
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