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09 August 2022 <br />Project No. 22-6942 <br />Page 6 of 16 <br />AdvancedGeo <br />An Empdayre.Owned Company <br />4.1. GROUNDWATER DESCRIPTION FOR THE GENERAL AREA <br />According to the State of California Department of Water Resources (DWR) Sustainable <br />Groundwater Management Act (SGMA) Data Viewer, Seasonal Report for Spring 2021, <br />depth to groundwater at the site is approximately 60 to 70 feet below surface grade (bsg). <br />Between 2011 and 2021, depth to groundwater at the site has fluctuated between 45 and <br />70 feet bsg. Groundwater flow direction locally appears to be toward the north. <br />Groundwater was not encountered in the 42 -inch -deep percolation test hole advanced on <br />01 August 2022. <br />4.2. GROUNDWATER CONTAMINATION IN THE AREA OF THE SITE <br />The immediately adjacent and outlying land use for the parcel is mostly agricultural with <br />minor residential. 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 California Department of Toxics and Substances Control (DTSC) <br />EnviroStor Database and the California Geotracker Web site did not reveal any Leaking <br />Underground Storage Tank (LUST) sites or other environmental investigations within <br />0.5 miles of the site. <br />4.3. ON-SITE EXISTING WELL DESCRIPTION <br />There is one existing domestic water supply well on the property. The well was installed <br />in September 1997 (SR0013594). The well is composed of 6 -inch diameter, polyvinyl <br />chloride (PVC) casing installed in a 12 -inch diameter bore hole. The well grout seal is <br />installed to 100 feet bsg and the approximate total depth of the well is 198 feet bsg. The <br />onsite well provides potable water to the existing residence and subject property. A copy <br />of the well permit is included in Appendix B. <br />4.4. CONSTITUENTS BEING TESTED FOR IN THE WATER SAMPLE <br />Nitrate (NO3) constituents and 1,2-dibromo-3-chloropropane (DBCP) were analyzed in <br />the existing groundwater supply well at the subject property. <br />4.5. GROUNDWATER SAMPLE COLLECTION <br />On 01 August 2022, a sample of the drinking water provided by the current groundwater <br />supply well at 14250 South Jack Tone Road, Manteca, California was collected in an <br />unpreserved 0.5 -liter plastic container and two volatile organic analysis (VOAs) vials. The <br />groundwater sample containers were properly labeled, placed in a chilled container, and <br />transported under chain -of -custody protocols to McCampbell Analytical, Inc. (MAI), a <br />