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Eckert Cold storage (0-iuny <br /> 757Moffat Blvd, Afantera, California November 1, 1995 <br /> ' Underground Tank Investigation, Continued Phase I Work Plan Page: 2 <br /> were analyzed to determine the extent of the soil contamination plume The three <br /> monitoring wells provided data for deternuning gradient and analyses of the underlying <br /> groundwater <br /> 1 During the initial development of the wells, it was discovered that the well casing in Mw- <br /> 2 had been damaged during installation of the well Bailers and pumps would not go <br /> down the well and only water level readings could be taken with an electronic sounder <br /> Rather than overdrilling this well and setting a replacement well, it was decided to keep <br /> this well for gradient information Because all three borings had contamination, it was <br /> decided to place the replacement well in the down-gradient direction On March 22, <br /> 1995, a replacement well, MW-4, was installed (Figure 3) <br /> 3.4 Work Plan <br /> Wf1F proposes to complete three soil borings as two inch i d monitoring wells with PVC <br /> casing I he three monitoring v.ells will allow for lateral determination and analysis of the <br /> underlying groundwater The wells are estimated to be approximately forty feet in depth <br /> with five feet of well screen above the static water elevation, and fifleen feet below the <br /> water elevation to allow for groundwater fluctuation Actual well depth termination will <br /> be identified by the geologist at the time of the drilling <br /> 3.1 Drilling <br /> Permits will be obtained as necessary for all wells (including borings) before drilling <br /> begins The soil boring will be accomplished using a mobile mounted drilling ng <br /> employing the use of a hollow stem flight auger no less than 3 114-inch i d and 8-inch <br /> o <br /> I All drilling equipment will be thoroughly steam-cleaned before drilling begins, to <br /> prevent the introduction of contamination from off site, and between borings to prevent <br /> cross contamination <br /> ' The borings will be logged under the direct supervision of a Registered Professional <br /> using the Unified Soil Classification System (Appendix D) The color, texture, <br /> ' moisture, plastic-ty (if applicable), consistency of the earth matenals, pertinent sod or <br /> bedrock characteristics, and any evidence of contamination will be noted All water- <br /> bearing zones and the depths at which they were encountered will be noted on these <br /> logs(Appendix A) <br /> 1 <br />