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Eckert Cold Storage Company <br /> 7S7 Moffat Blvd, Manteca, California May S, 1995 <br />' Underground Tank Investigation, Phase I Report of Findings Page: Z <br /> r <br /> 3,0 Scope of Work <br /> On January 26, 27 & 30, 1995, WFIF drilled three soil borings and completed each as a <br /> groundwater monitoring well with two-inch i d PVC casing Samples from the bonngs <br />' were analyzed to determine the extent of the soil contamination plume The three <br /> monitoring wells provided data for determining gradient and analyses of the underlying <br /> groundwater <br /> 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 /> 1 down the well and only water level readings could be taken with an electronic sounder <br /> Rather than overdnlhng 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 /> 1 <br /> 3.1 Drilling <br /> Permits were obtained for all wells before drilling began. The soil borings were <br /> accomplished using a mobile mounted drilling ng employing the use of a hollow stem <br /> flight augers of 7 and 10-mch o d <br /> All drilling equipment was thoroughly steam-cleaned before drilling began, to prevent <br />' the introduction of contamination from off site, and between borings to prevent cross <br /> contamination <br /> The borings were logged under the direct supervision of a Registered Professional <br /> using the Unified Soil Classification System (Appendix E) The color, texture, <br /> moisture, plasticity (if applicable), consistency of the earth materials, pertinent soil or <br />' bedrock characteristics, and any evidence of contamination were noted All water- <br /> bearing zones and the depths at which they were encountered were noted on these logs <br /> (Appendix C) <br />' Boringsinto the saturated zone were drilled to a maximum of twee <br /> twenty feet beneath the <br /> top of the aquifer being explored Upon termination,the boring into the saturated zone <br /> was completed as a monitoring well and backfilled with concrete grout, after a <br /> Bentonite seal has been placed The boring for the monitoring well was of a diameter <br />' Y at least four inches greater than the two-mch diameter of the well casing used <br /> The cuttings from the drilling operation were containerized on-site during drilling for <br /> proper disposition. The proper method of disposal will be dependent upon results of <br />