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15999 W CORRAL HOLLOW RD Project No.2019-00027 Page 14 groundwater), is approximately 940 and 955 feet below the ground surface. However, for site groundwater depth assumptions, this would be erroneous to assume. Varied topography and localized washes may have much different groundwater levels than as shown on the County wide map. Therefore,we have relied on more site-specific date as reviewed from LLNL for the Site 300 Test Facility. In general,the regional groundwater in the vicinity of the Site appears to flow to the northeast. It should be noted,no groundwater was encountered by the staff of Petralogix,Inc.during the drilling of the test boring for our concurrent SSS on June 17,2019. As discussed in more detail in our concurrent SSS, review of monitoring well data from the Water Board's Geotracker Website showed the minimum and maximum depths to groundwater were found to be between._ to 16.8 feet below ground surface, respectively. Therefore, the best estimated minimum' gro n water depth around the project-specific area (within the larger Site 300 Test Facility)ii�94 feet below ground surface. 3.2 Potential Groundwater Contamination Issues No above- or below-ground off-site potential or known sources of contamination were identified from current uses of the surrounding properties,except for the following: • Surrounding properties are used for agriculture; agricultural chemicals may be applied to �i these properties. • The site and surrounding properties utilize septic systems. The site is located within a rural/agricultural mountainous region;groundwater contamination can result from activities related to farming practices where chemicals are applied to crops which may permeate to groundwater.The site and surrounding properties utilize septic systems; leakage from septic tanks or failed septic systems can introduce bacteria to groundwater. 3.3 Current and Future On-Site Groundwater Uses The use of ground water for drinking water is planned for the proposed development.Groundwater is already used for all onsite purposes.There are currently four water supply(4)wells on the site.All of these wells are over 500+feet away from the propose sep c e More detailed discussions regarding this are attached to our concurrent SSS report. 4.0 SOURCES AND IMPACT OF NITRATE TO GROUNDWATER 4.1 Current Off-Site Sources of Nitrate The EHD septic permit files were reviewed from the San Joaquin Environmental Health Department (EHD)on June 28,2019 in an effort to obtain copies of permits for any septic tanks located within the general area of the subject property. None were found to exist within the near vicinity. However, in order to estimate septic system density for the area, recent site plans of the Site 300 facility were reviewed. Based on the acreage and reviewed site information(refer to our concurrent SSS), we estimated that there are approximately 4 septic systems per square mile in the general vicinity of the site.As previously indicated,the neighboring parcels are very large,rural-agriculture sites, with no permitted facilities. Based on this, sources of nitrate are limited. In addition, onsite water testing showed non-detect and below regulatory standard limits for nitrate. 1 / Petralogix Engineering,Inc. 26675 Bruella Road,Galt,Ca 95632 (209)-400.5729 / www.petralogbuom