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G of the site. Tennant improvements inside the proposed building are expected to consist of _ a maximum of two bathrooms. The facilities are expected require installation of a well and septic system. 5.0 GROUNDWATER Well water level data in the vicinity (Local Well ID: 02S06E31N001, located approximately 1 mile northwest of the site) indicates groundwater to have been as high as 8.5 feet below grade (elev. 57.9, on 4/17/13) and as low as 53.7 feet below grade (elev. 12.7, on 6/28/60). Based on data from that well groundwater has not fluctuated more than 5 feet during the period 2007 to 2013. Groundwater encountered during our study was at a depth of 22.0 feet (elev. 53.0, on 12/18/13). This level appears to be generally consistent with groundwater levels in the vicinity. Groundwater at the site and vicinity generally flows northeastly similar to the slope of the topography in the area (per San Joaquin County Flood Control and Water Conservation District"Fall 1999— Spring 2007 Groundwater Report"). Based on information provided within a letter from SJCEHD "Revised PA-1300183 (SA), SU0009811 266550 S. Banta RD, Tracy", it is understood that there is a potential for groundwater contamination from a chloroform and carbon tetrachloride contamination plume located at 26700 South Banta Road, Tracy (Olin Chlor Alkali Products Parcel located within 1000 feet of the subject site). Based on above letter from SJCEHD, all future wells shall require a minimum 200 foot annular grout seal as directed by the Central Valley Regional Water Quality Control Board. Water sampling and testing w' not p ormed because there is currently no well located on the subject site. 6.0 SUBSURFACE SOILS A field investigation was performed on 12/18/13 which included geologic reconnaissance and excavation of two soil/groundwater test borings (B-1 and B-2) to a maximum depth 25 feet. The soil borings were drilled using four inch flight auger with a Simco 2800 drill rig. Soils were logged and field investigation was performed by a CTE Cal hlc. project engineer/geologist. The test borings were logged using the Unified Soil Classification System (USCS) as to consistency, color, texture, and gradation, on the bases of excavation resistance and observation of soil samples and drill cuttings. Groundwater observations were made during and after completion. Soil logs and percolation test data are included in Appendix A and B. The test borings were grout backfilled upon completion. Locations of the explorations are shown on the "Exploration Map" (Figure 2), attached. Published mapping indicates soils at the site consist of alluvial soils classified as "Capay clay". These soils are described as very deep, moderately well drained, nearly level soil in interfm basins (USDA, Soil Survey of San Joaquin County, California, dated October 1992). The Capay clay is indicated as having a rate of water intake in irrigated areas of , 0.1 inch per hour (approximately 590 min/inch). Published geologic mapping of the sitelvicinity shows geologic units at the site to consist of Quaternary alluvial deposits RIVERSIDE I VENTURA I MERCER I TRACY I SACRAMENTO I PALM SPRINGS I LANCASTER e ED1ECHNICAL I ENVIRONMENTAL I CONSTRUCTION INSPECTION AND TESTING I CIVIL ENGINEERING I SURVEYING