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13 August 2021 AdvancedGeo <br />An E mplb dCo oy <br />Project No. 21-6530 <br />Page 9 of 14 <br />8.0. GROUNDWATER ANALYSIS <br />The subject property does not have a potable water well. <br />8.1. DESCRIPTION OF LOCAL GROUNDWATER <br />According to the State of California Department of Water Resources (DWR) Sustainable <br />Groundwater Management Act (SGMA) Data Viewer, Seasonal Report for Spring 2020, <br />depth to groundwater at the site is approximately 70 feet bsg. Between 2011 and 2019, <br />depth to groundwater at the site has fluctuated between 70 and 95 feet bsg. Groundwater <br />flow direction locally appears to be to the northeast. Groundwater was not encountered <br />in the 42 -inch -deep percolation test hole advanced on 12 August 2021. <br />8.2. EXISTING OR POTENTIAL GROUNDWATER CONTAMINATION <br />The immediately adjacent and outlying land use for the parcel is residential. Potential <br />groundwater contamination can occur from several sources including leaking <br />underground storage tanks, septic systems, agricultural activities, dairies, and stormwater <br />infiltration. <br />A review of the DTSC EnviroStor Database and the Geotracker Web site did not reveal <br />any LUST sites within 0.5 miles of the site. The review did not reveal any other sites of <br />environmental concern within a half -mile radius of the site. Based on the information <br />reviewed, there is no existing or known groundwater contamination at the site and the <br />potential for groundwater contamination is de minimis. <br />8.3. CURRENT AND FUTURE USE OF GROUNDWATER AT THE SITE <br />The subject property does not have a potable water well. A potable water well will be <br />installed during the construction of the new residence. <br />9.0. IMPACT OF NITRATE TO GROUNDWATER <br />Due to the planned residential use of the property and the potential for nitrate leaching <br />into the groundwater from the proposed septic system, a nitrate loading analysis for the <br />future use of the septic system is required by the EHD. <br />9.1. CURRENT OFF-SITE SOURCES OF NITRATE <br />Septic systems and agriculture are sources of nitrates in the area of the site. The property <br />