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07 Septmber 2021 <br />Project No. 21-6531 <br />Page 5 of 14 <br />comprise a major widespread aquifer extending hundreds of feet deep and occasionally <br />containing individual confining layers. The Modesto, Riverbank, Turlock Lake Formations <br />and overlying recent alluvium are the principal source of domestic groundwater in the <br />13,500-square mile San Joaquin Valley Groundwater Basin (Basin 5-22). This basin is <br />drained primarily by the San Joaquin River, which is approximately fourteen miles <br />southwest of the subject property. The nearest surface water feature to the site is Little <br />Johns Creek, which is approximately 1,100 feet north of the subject property. <br /> <br /> <br />4.1. GROUNDWATER DESCRIPTION FOR THE GENERAL AREA <br /> <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 120 feet below surface grade (bsg). <br />Between 2011 and 2019, depth to groundwater at the site has fluctuated between 105 <br />and 140 feet bsg. Groundwater flow direction locally appears to be to the northwest. <br />Groundwater was not encountered in the 42-inch-deep percolation test hole advanced on <br />23 August 2021. <br /> <br /> <br />4.2. GROUNDWATER CONTAMINATION IN THE AREA OF THE SITE <br /> <br />The immediately adjacent and outlying land use for the parcel is residential and <br />agricultural. Potential groundwater contamination can occur from several sources <br />including leaking underground storage tanks, septic systems, agricultural activities, <br />dairies, and stormwater infiltration. <br /> <br />A review of the California Department of Toxics and Substances Control (DTSC) <br />EnviroStor Database and the Geotracker Web Site did not reveal any Leaking <br />Underground Storage Tank (LUST) sites within 0.5 miles of the site. <br /> <br /> <br />4.3. ON-SITE EXISTING WELL DESCRIPTION <br /> <br />There is one existing domestic water supply well on the property. The well consists of an <br />8-inch diameter steel casing in a 12-inch diameter borehole with a 50-foot sanitary grout <br />seal. A well completion report is not on file with the EHD or Department of Water <br />Resources (DWR). <br /> <br /> <br />4.4. CONSTITUENTS BEING TESTED FOR IN THE WATER SAMPLE <br /> <br />Nitrate (NO3) constituents and 1,2-dibromo-3-chloropropane (DBCP) were tested in the <br />existing groundwater supply well at the subject property. <br />