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Potential Groundwater Contamination Extensive water quality tests were conducted for the City of Tracy well(2,500 Lf. northwest of the project site). A multi-completion monitoring well was constructed to collect water quality samples at various depths. General mineral, physical,and inorganics were tested, indicating no results exceeded primary drinking water standards. TDS and some salts did exceed secondary standards. No organic contaminants were tested. Nitrate(NO3) ranged from 16.3 mg/I (upper zone at 370')to 4.5 mg/I (lowest zone at 550'). Water data was also collected from the well located at the project site (see below). Test results show several secondary drinking water standards exceed MCL's (TDS,chloride, sulfate, iron), and one primary drinking water standard (hexavalent chromium). Nitrate data collected from January, 2010 through November, 2016,show that nitrate is present, ranging from approximately 5 mg/1-N to 8.5 mg/1-N. However,data shows no clear trend in nitrate concentrations,so nitrate concentrations appears stable at this time. Currently there are no existing septic disposal systems within the development area of the proposed parcel. An aerial survey extending one(1)square mile from the proposed septic system location found one (1)on-site disposal system belonging to the Owens-Corning facility located east of the proposed development. Extending the survey beyond the square mile indicates that areas to the west, north,and east have,or area expected to have, public sewage collection systems,as they are within the City of Tracy planning boundaries. The proposed Septic System is proposed to be located at the northeast corner of the proposed parcel, directly adjacent to West Schulte Road. New developments in the area north of West Schulte Road will have public sewage collection systems,according to City of Tracy planning documents. Expected On-Site Maximum Septic Tank Usage Maximum expected septic usage on the Site would be from the proposed warehousing project. Calculations for maximum septic loading is from bathrooms and an employee breakroom for serving the projected maximum number of employees for the facility. No other wastewater sources are proposed. On-Site Wells A small domestic well is used for drinking water for the existing warehouse(SJCEHD identified as Schulte Road Warehouse Water System, 15000 W.Schulte Road,APN 209-24-025). z The well driller's report indicates the well was constructed in 1990, is 400' deep with perforations between 300' and 400' below grade, and a 10"casing. The proposed project has constructed a small 8"well for potable water use. Additional non-potable irrigation water may be available and used from Bethany Byron Irrigation District. Projected potable Z Actual parcel address is 14700 W.Schulte Road,Tracy,California(APN 209-240-034). 21 Page