ARCHIVED REPORTS_XR0012516 - Laserfiche WebLink

Home Browse Search

Eckert Cold Storage 757 Moffat Blvd, Manteca CA 11/23/98 Receptor Survey Page: 2 1 VVHF, Inc. (VVIU) has been contracted to explore the problem and to report the findings. On January 26, 27 & 30, 1995, WHF drilled three soil borings and completed each as a groundwater monitoring well with two-inch inside diameter. PVC casing. Samples from ' the borings were analyzed to determine the extent of the soil contamination plume. The three monitoring wells provided data for determining gradient and analyses of the underlying groundwater. ' During the initial development of the wells, it was discovered that the well casing in MW- 2 had been damaged during installation of the well. Bailers and pumps would not go ' down the well and only water level readings could be taken with an electronic sounder. Rather than overdrilling this well and setting a replacement well, it was decided to keep ' this well for gradient information. Because all three borings had contamination, it was decided to place the replacement well in the down-gradient direction. On March 22, 1995, a replacement well, MW-4, was installed (Figure 3). ' On September 18 and 19, 1997, WW, Inc., in conjunction with Frontier Drilling Company, a licensed C57 Contractor, did 'drill three (3) soil borings and converted same to groundwater monitoring wells with 2" inside diameter. PVC casings. Sample from the borings were analyzed to determine the extent of the soil contamination plume. The three (3) new monitoring wells, MW-5, 6 & 7, were developed in conjunction with HKM ' Environmental, Inc., on November 4 and all 6 monitoring wells were purged and sampled on November 5, 1997. This event provides data for the gradient determination and an analysis of the underlying groundwater. 1 3.0 Scope of Work ' On May 27, 1998, VVIR', conducted interviews and a physical site inspection of the subject property to locate and identify any receptors within the area identified in Figure 3. It is the purpose ' of this study to address if groundwater contamination will reach these receptors and pose a risk to public health. t 3.1 Groundwater Conditions ' Groundwater measurements have been taken from February 18, 1995, to April 7, 1998. The depth to water has ranged as shallow as 15.33 feet below ground level (bgl) to as deep as 24.81 feet bgl. Table 1 is shown below to illustrate the historical groundwater elevations