Laserfiche WebLink
27 April 2020 AdvancedGeo <br /> Project No. 20-5084 Anfrnpfoyee Owned Company <br /> Page 6 of 15 <br /> appears to be toward the north. Groundwater was not encountered in the 57-inch deep <br /> percolation test hole advanced on 16 April 2020. <br /> 4.2. GROUNDWATER CONTAMINATION IN THE AREA OF THE SITE <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 /> A review of the California Department of Toxics and Substance Control (DTSC) <br /> EnviroStor Database and the Geotracker Web site did not reveal any properties of <br /> environmental concern within a 0.5-mile radius of the site. <br /> 4.3. ON-SITE EXISTING WELL DESCRIPTION <br /> There is one existing domestic water supply well on the property. One permit is on record <br /> at EHD (82-412) dated 30 July 1982 for new well installation (Appendix B). According to <br /> the permit, the well was installed in July 1982 with 6-inch diameter PVC casing and a <br /> bentonite grout seal to 50 feet bsg; no other information is provided on the permit. AGI <br /> reviewed files using the Department of Water Resources (DWR) online database and <br /> could not locate any additional information about the well. Currently, the well provides <br /> potable water to the existing residence and will provide potable water to the proposed <br /> residence. <br /> 4.4. CONSTITUENTS BEING TESTED FOR IN THE WATER SAMPLE <br /> Nitrate (NO3) constituents were tested in the existing groundwater supply well at the <br /> subject property. <br /> 4.5. GROUNDWATER SAMPLE COLLECTION <br /> On 16 April 2020, a sample of the drinking water provided by the current groundwater <br /> supply well at 11855 Mountain View Road, Tracy was collected in an unpreserved 0.5-liter <br /> plastic container. The groundwater sample container was properly labeled, placed in a <br /> chilled container and transported under chain-of-custody protocols to McCampbell <br /> Analytical, Inc. (MAI), a California Environmental Laboratory Accreditation Program <br /> (ELAP)-certified laboratory. The sample was analyzed for Nitrate as Nitrogen (N) and <br /> Nitrate as NO3-. <br />