SR0081254 SSNL - Laserfiche WebLink

Home Browse Search

30 August 2019 AGE Project No. 19-4819 Page 6 of 15 4.1. GROUNDWATER DESCRIPTION FOR THE GENERAL AREA According to the San Joaquin County Flood Control and Water Conservation District’s Lines of Equal Depth to Groundwater Fall 2018 and the Department of Water Resources (DWR) Water Data Library, depth to groundwater at the site is approximately 20 to 30 feet below surface grade (bsg). Groundwater flow direction locally appears to be toward the north. Groundwater was not encountered in the 42-inch deep percolation test hole on 22 August 2019. 4.2. GROUNDWATER CONTAMINATION IN THE AREA OF THE SITE The immediately adjacent and outlying land use for the parcel is residential and agricultural. Potential groundwater contamination can occur from several sources including leaking underground storage tanks, septic systems, agricultural activities, dairies, and stormwater infiltration. A review of the California Department of Toxics and Substance Control (DTSC) EnviroStor Database and the Geotracker Web site did not reveal any sites of environmental concern within a half-mile radius of the site. 4.3. ON-SITE EXISTING WELL DESCRIPTION There is one existing domestic water supply well on the property. The well was installed in May 1976 under EHD permit number 76-330W (Appendix B). The well is constructed with a 6.625-inch diameter casing and a grout seal to 50 feet; the total depth and screen interval of the well is unknown. Currently, the well provides potable water to the existing residence onsite and will provide potable water to the proposed residence. 4.4. CONSTITUENTS BEING TESTED FOR IN THE WATER SAMPLE Nitrate (NO3) constituents were tested in the existing groundwater supply well at the subject property. 4.5. GROUNDWATER SAMPLE COLLECTION On 22 August 2019, a sample of the drinking water supplied by the current groundwater supply well at 17454 Von Sosten Road, Tracy was collected in an unpreserved 0.5-liter plastic container. The groundwater sample container was properly labeled, placed in a chilled container and transported under chain-of-custody protocols to McCampbell Analytical, Inc. (MAI), a California Environmental Laboratory Accreditation Program (ELAP)-certified laboratory. The sample was analyzed for Nitrate as Nitrogen (N) and Nitrate as NO3-.