Laserfiche WebLink
Section 3 <br />Field Data Collection Procedures <br />This test will be performed by adding water to the piezometer from a graduated <br />carboy (fluid container) until the head reaches a target level that is then maintained <br />over a given period. Over the 3- to 5-minute period (or until the fluid container has <br />been emptied), during which a constant head is maintained, water is added from the <br />graduated carboy to the piezometer, which is equipped with an overflow port. Water <br />spilling from the overflow port is captured in another graduated container. The rate at <br />which water is injected to the aquifer is calculated by subtracting the overflow <br />amount from the amount poured into the piezometer, divided by the length of time <br />during which water is injected. <br />Analysis according to Cardenas and Zlotnik (2003) will be performed using the <br />following equation: <br />in which: <br />K= Q <br />2 ~z LPy <br />K =Hydraulic conductivity <br />Q =Injection rate <br />L =Length of piezometer screen interval <br />P =Shape factor (from Butler 1998) <br />y =Head in piezometer above stream stage <br />The hydraulic conductivity measurements will allow for development of an empirical <br />relationship between grain size distribution and hydraulic conductivity. This <br />relationship will be used at the other sediment sample locations where only grain size <br />data are available to estimate the hydraulic conductivity. This will allow <br />determination of average streambed hydraulic conductivity values on a reach by <br />reach basis in acost-effective manner. <br />3.2 Task 39 Collection of Water Level Data <br />This task will enhance the State's groundwater database by continuing the Phase 2 <br />collection of water level measurements during the fall season after agricultural <br />pumping has ceased, and it will add to the understanding of seasonal changes in <br />groundwater levels when compared to the SEO's spring season measurements. It is <br />anticipated that this task will involve up to 109 bedrock monitoring wells that will be <br />measured in the fall after the irrigation season. Additionally, water levels will be <br />measured at the alluvial wells installed for Task 35 during Phases 1 and 2, and at 10 <br />supplemental wells that are key data collection sites but are not measured by a SPDSS <br />cooperating entity. <br />3.2.1 Bedrock Water Level Measurements <br />Under Task 39 in Phase 2, wells that are part of the SEO water level monitoring <br />program were evaluated for inclusion in the fall water level monitoring program. <br />Additionally, water level data were obtained from wells monitored by cooperating <br />`~ ~ <br />3-4 <br />FINAL SPDSS T33 WORK PLAN &3-OS.DOC <br />