Laserfiche WebLink
3 .2 Water Monitoring Well Construction <br /> The monitoring wells were constructed as outlined below. Well <br /> construction details are included in Appendix D, and well <br /> installation procedures are presented in Appendix E. <br /> The screened intervals of the three monitoring wells are as <br /> follows: <br /> Approximate Approximate Screen <br /> Well Casing Diameter, Total Depth Interval <br /> Number (Ynches f� bcr (f ba) <br /> MW-10 4 75 35 to 75 <br /> MW--11. 4 78 63 to 78 <br /> MW-12 4 78 63 to 78 <br /> Monitoring Well MW-10 was screened 25 feet higher to serve as a _ <br /> dual ground water monitoring/recovery well and a vapor extraction <br /> well. <br /> 3 . 3 Well Development, Monitoring, and Sampling <br /> The monitoring wells were developed on April 6, 1992 by removing <br /> 10 casing volumes of water and until stabilization of pH, <br /> temperature, and conductivity parameters. <br /> MW-10, MW-11, and MW-12 were monitored and sampled on <br /> April 7 , 1992 . Water levels in each well were measured to the <br /> nearest 0. 01 foot from the top of the PVC casing using an <br /> electronic sounder. A ground water elevation contour map, based <br /> on interpretation of ground water level and survey data, is shown <br /> in Figure 3 . <br /> Survey data and water level measurements are summarized in <br /> Table 2 . General field procedures for well development and <br /> sampling, and field survey forms are presented in Appendix F. <br /> 4. 0 ANALYTICAL METHODS <br /> Laboratory analysis was performed by Sequoia Analytical, a <br /> California-certified laboratory. Analytical methods, off ictal <br /> laboratory reports, and chain of custody records are presented in <br /> Appendix F. Chemical analysis of soil and ground water samples <br /> as performed using standard test methods of the United States <br /> Environmental Protection Agency (EPA) and the Californi-a <br /> Department of Health Services (Cal--DHS) , as discussed below. <br /> 3 <br /> i <br />