Project of Maintenance and Information Correction of the Regional Groundwater Monitoring Wells
| Absrtact |
The objective of this project is to maintain the function of the Regional Groundwater Monitoring Wells (RGMWs) continously and to keep the best condition of the RGMWs, which based on the experience of the previous projects of 2004 to 2008. On the other hand, the basic well information is corrected in order to establish the integrity of the network of the RGMWs. According to the maintenance records of the well inspected from 9/2008 to 3/2009, the 35 wells are screened to proceed the evaluation of well condition in this project by the 5 principles of the “unusual well depth”, “groundwater recovery slowly”, “obvious turbidity in well”, “unusual color of groundwater”, and “the odor of water in well”. The project results of the major tasks are described as below:
1. Providing periodical cleaning to the RGMWs
(1)The 36 wells were completed to evaluate well condition within down-hole video inspection and slug test. Among that, the well located in Houlong Seashore Recreation Park, Miaoli County, was poured paint based on the inspected report. Thus, it was directly taken into the list of well development besides the original 35 wells according to the directive of the EPA. So that all 36 wells were executed well condition evaluated.
(2)The 31 wells redeveloped were completed and executed the slug test and down-hole video. All 31 wells involved 25 wells of condition unusual, screened from EPA wells maintenance information reports from 9/2008 to 3/2009, 3 wells of unusual condition occurred frequently, and 3 wells of never implement well condition evaluated since they were installed.
(3)The 35 wells borehole flow velocity and directions were measured and provided monitoring well background information.
(4)The groundwater sampling and water quality measurement of the 31 wells were completed. Meantime, the trend of the water quality by the Stiff and Pipper figures and variable aqueous indices were done. Also, PHREEQC program was measured the groundwater saturated condition and possible minerals formatted.
(5)The 3 wells of groundwater real time sampling were completed. Therefore, to understand the quality condition of groundwater in well and aquifer groundwater surround well.
2. Verification and correction of the basic well information
(1)The altitude of the selected 45 wells was examined. Generally, the altitude recorded in the basic well information showed significant error (-11.98m ~ +3.56m) and all were corrected. One of all examined wells altitude error exceeded 10 m.
(2)The screen depth and length of the selected 35 wells were examined by the down-hole video. Among that, 14 wells were error in screen depth and length involving Yu-Cheng elementary school, Taipei City. Others were as same as the basic well information records.
(3)The variants of environmental data of the 35 wells were analyzed. Among that, the water table of the 7 wells was located the screen depth in the history. Others 16 wells were above the screen up or below the screen bottom. The historical water table of 12 wells was always above the screen up.
(4)The homepage of the basic information of the RGMWs was established according to the implemental results of previous projects from 2004 to 2008 and to date. Follow up the schedule of
|
|---|---|
| Keyword |
Regional, Groundwater, Monitoring Well
|
