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12172 N Hibbard Road Project No.2021-00063 Page 14 to these maps,(Plates 6 and 7)in Appendix A,groundwater elevation is approximately-55 feet below mean sea level (msl) in both the fall and spring. The elevation of the land, as previously mentioned in Section 1.1, is approximately 75 feet above mean sea level. Therefore, the depth to groundwater (the difference between the elevation of the Site and the elevation of groundwater),is approximately 130 feet below the ground surface (bgs) in the fall and spring.The groundwater in the vicinity of the Site appears to flow to the southeast,at a gradient of approximately 7 feet per mile,toward a cone of depression. No groundwater was encountered by the staff of Petralogix, Inc. during the shallow percolation test hole auguring on June 24, 2021. 4.2 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 these properties. • The site and surrounding properties utilize septic systems. The Site is located within an agricultural 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. 4.3 Water Sample Locations and Constituents A domestic well groundwater sample was obtained from the site on June 18, 2021 by Tonya Scheftner. Laboratory supplied containers, an ice-chest, ice, chain-of-custody documentaion, and sampling equipment (plastic gloves, plastic bags) were obtained prior to sampling. The sample was collected after flushing the system with a reduced steady stream for a minimum of five minutes. No filtration system was observed or reported. The well water sample was analyzed for nitrate as nitrogen and DBCP. The analytical methods and results are included in the following table: Table 2. Laboratory Analytica Results,June 18, 2021 Analytical Well Method Units Sample MCL Nitrate (as Nitrogen) E300.1 mg/L 2.0 10 DBCP E524.3 u L ND 0.2 1. Based on EPA's MCL (Maximum Contaminant Level). ND = non-detect to laboratory detection limit Bold indicates sample is above the MCL The laboratory report is available for review in Appendix B. Petral09ix Engineering,InC. - 26675 BruelIa Road,Galt,Ca 95632 (209)-401}5729 www.petralogix.com