TY  - THES
T1  - Groundwater quality monitoring with emphasis on data analysis at the Payatas-Novaliches reservoir area
A1  - Aquino, Charlymagne R.
LA  - English
UL  - https://tuklas.up.edu.ph/Record/UP-99796217602799164
AB  - Concern vover the possible contamination of the Novaliches Reservoir due to leachates from the Payatas Open Dumpsite have escalated ever since the tragedy that occured at Payatas in July 2000. Several agencies have conducted studies on the groundwater at the Payatas-Novaliches Reservoir area using techniques such as georesistivity survey and groundwater modelling. This study aims to investigate the effects of the Payatas Open Dumpsite on the Novaliches Reservoir using statistical analysis of groundwater quality data collected in the study area. Initial investigation of the laboratory results of the groundwater sampling for 18 sampling points showed that most physic-chemical and metal parameters analyzed pass DAO 34 standards for Class A waters. These include the parameters, pH, conductivity, TDS, TSS, CI, BOD5, COD, Ammonia-N, TKN, As, Cd, CA, Cr, Cu, Fe, Pb, Mg, Mn, Hg, Ni, K, and Zn. The parameters DO, total coliform and fecal coliform were, however, found out to be above the standards in almost all the 18 sampling points in the study area. Contour plots were constructed showing the groundwater quality profile in the study area for 13 water quality parameters. The results showed that the groundwater near the dumpsite is slightly acidic. The levels of conductivity, TDS, Cl, Ca and Mg were also found out to be high nbear the dumpsite relative to the concentrations near the reservoir.
AB  - A comparison of the concentration of several water quality parameters using the t-test and the U-test was done for wells located near the dumpsite and wells located near the reservoir. The results of these tests show that the decrease in pH from the reservoir to the dumpsite is statistically significant. The t-test conducted for the parameters conductivity, TDS, Cl, Ca and Mg confirm the presence of dissolved salts contamination of the groundwater near the dumpsite. the U-test conducted for the parameters Cr, Cu, and Zn confirm the presence of contamination of these three metals at the wells near the reservoir. Both the t-test and the U-test, however, do not give any indication of the presence of contamination of the groundwater near the reservoir due to leachates from the dumpsite. The collected groundwater monitoring data was also used in constructing prediction intervals allowing an early prediction of groundwater contamination near the reservoir based on future groundwater quality measurements. The calculated upper prediction limits for four of the five regulated heavy metals are As=0.0022 mg/L, Cd=0.0018 mg/L, Cr=0.0052 mg/L and Pb=0.0681 mg/L. The confidence level of the upper prediction limit is 95% for As and Cd and 92.3% for Cr and Pb. The upper prediction limit means that we are 95% confident (92.3% for Cr and Pb) that the next two future measurements of As and Cr will fall below their respective upper prediction limits. Any measurement above this limit is an indication of the presence of contamination in the groundwater near the reservoir.
CN  - LG 995 2002 E653 A68
KW  - Groundwater : Quality. : Philippines : Quezon City.
KW  - Water quality : Measurement. : Philippines : Manila Metropolitan Area.
KW  - Groundwater : Sampling : Philippines : Quezon City.
ER  -