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07 June 2022 Project No. 14-3154 Page 3 of 6 AdvancedGeo An Employee- Owned Company in the location of T-29, was graded, surfaced with asphalt, and developed into a parking area. At that time, no evidence of waste or any waste pits were observed by the property owner in this location. On 24 November 2017, the property owner took photographs of the southwest corner/T-29 area after grading but before surfacing. There is no evidence of waste in the photographs. The photographs are presented in Appendix C. 3.1. GEOLOGIC SETTING The regional geologic setting is situated within the Great Valley Geomorphic Province of California, an elongate, northwest trending structural trough running 400 miles through Central California. The Great Valley is bound to the north by the Klamath Mountains, the south by the Tehachapi Mountains, the east by the Sierra Nevada Mountains, and the west by the Coast Ranges. Approximately 32,000 feet of marine and continental sediment have been deposited almost continuously since the Jurassic. The northern and southern regions of the Great Valley are designated the Sacramento and San Joaquin Valleys, respectively. The subject property is located within the San Joaquin Valley. 3.2. HYDROGEOLOGIC SETTING The site and surrounding area lie within the San Joaquin Valley Groundwater Basin, Eastern San Joaquin Subbasin (5-22.01). This subbasin is bound on the south, southwest, and west by the Modesto, Delta -Mendota, and Tracy Subbasins, respectively, and on the northwest and north by the Solano, South American, and Cosumnes Subbasins. The Eastern San Joaquin Subbasin is drained by the San Joaquin River and several of its major tributaries namely, the Stanislaus, and Calaveras, and Mokelumne Rivers. The San Joaquin River flows northward into the Sacramento and San Joaquin Delta and is discharged into the San Francisco Bay. Annual precipitation within the subbasin ranges from about 11 inches in the southwest to about 25 inches in the northeast. Generally, the subsurface of the subject property consists of silts and silty sands from the surface to 10 feet bsg, then grades into fine to medium sands at approximately 10 feet bsg and extending to 20 feet bsg; groundwater at the subject property is encountered in the fine to medium sands and is inferred to flow to the southeast. The property is located at an elevation of approximately 15 feet above mean sea level (MSL), in an area of low topographic relief and regional groundwater flow and slope of the area is toward the general southwest, which is consistent with the overall groundwater flow direction inferred at the site and in the area. There are no surface water features on the property. The nearest surface water feature in the vicinity is the San Joaquin River located approximately 1.5 miles to the west.