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20 January 2021 <br />Project No. 20-6284 <br />Page 10 of 14 <br />AdvancedGeo <br />An Employee-Owned <br />CCompony <br />between 80 and 110 feet bsg. Groundwater flow direction locally appears to be to the <br />north-northeast. Groundwater was not encountered in the 42 -inch -deep percolation test <br />hole advanced on 14 January 2021. <br />8.2. EXISTING OR POTENTIAL GROUNDWATER CONTAMINATION <br />The immediately adjacent and outlying land use for the parcel is agricultural and <br />residential, and the adjacent property to the west and south is used for Collegeville <br />Elementary School. Potential groundwater contamination can occur from several sources <br />including leaking underground storage tanks, septic systems, agricultural activities, <br />dairies and stormwater infiltration. <br />A review of the DTSC EnviroStor Database and the Geotracker Web site revealed one <br />(1) LUST site within a 0.5 -mile of the subject property. However, the LUST site has been <br />closed for over 15 years. Based on the status of the LUST and the distance and direction <br />from the subject property, the LUST should not impact the subject property. The review <br />did not reveal any other sites of environmental concern within a half -mile radius of the <br />site. Based on the information reviewed, there is no existing or known groundwater <br />contamination at the site and the potential for groundwater contamination is de minimis. <br />8.3. CURRENT AND FUTURE USE OF GROUNDWATER AT THE SITE <br />The existing water supply well at 6631 Jack Tone Road (site) likely conforms to DWR and <br />EHD standards and will be used to supply the subject property with a domestic water <br />source. <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 />is bordered by residential land, and near agricultural land, which might provide a nitrate <br />source. There are several residences and agricultural properties within 1,000 feet of the <br />site. <br />