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EnviroTech Consultants, Inc. Page 6 Site Investigation: Sampling Report Louise Avenue Water Treatment Facility 3.0 INITIAL SOIL SAMPLE COLLECTION 3.1 Initial Sampling (April 16, 2018) On April 16, 2018, soil samples were collected in three areas of the Site shown in Figure 2. Area 1 is the location of the release of the filter press sludge that drained into the storm drain inlet, Area 2 is the location that the filter cake was placed on the surface, and Area 3 is the portion of the retention pond that contained residual sludge from the filter press spill. Soil samples were collected using a hand auger at pre-determined locations. The latitude and longitude of soil sampling locations were determined with a hand-held GPS (Attachment 5). The soil sampling locations are identified in Figures 3 through 6. In each sampling location, the hand auger was advanced to 2 feet below ground surface(bgs), and the soil was examined to determine if there is any discoloration or staining. A soil sample was collected from the surface to 6 inches bgs and from 1 to 2 feet bgs. In Area 1, there were 12 sample locations along the 125- foot spill area that extended from the point of release to the storm drain inlet. In Area 2,there were 6 sample locations within the approximate 25 feet by 30 feet area where the filter cake was on the surface. In Area 3, there were 5 sample locations within the approximate 14 feet by 13 feet area. One background sample was collected on site in an area of undisturbed soil. One field duplicate soil sample was collected in a separate sample container, using the same procedures and at the same time, location and depth as one original sample. The field duplicate was analyzed for arsenic and vanadium. Field quality control was supervised by the on-site geologist. The soil sampling equipment was cleaned and washed with a non-phosphate containing detergent, rinsed with water, and dried before use and between each soil sample collection. All soil samples were placed in glass jars capped with Teflon-lined lids, labeled with the soil sample location number, depth, time and date. The labeled jars were placed in zip-lock bags in a cold ice chest and transported under chain-of-custody procedures to BC Laboratories for analysis.All soil samples were analyzed for the presence of arsenic and vanadium by EPA Method 6010-B, with solubility testing conducted as needed. Analytical testing was accomplished in accordance with the guidelines established in BC Laboratories Quality Assurance Manual, applicable standard operating procedures, and other related documentation. 5400 Rosedale Highway 0 Bakersfield, CA 93308 Tel 661.377.0073 Fax 661.377.0074