Laserfiche WebLink
29 May 2020 AdvancedGeo <br /> Project No. 20-6014 An Employee Owned Company <br /> Page 6 of 14 <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 revealed two (2) leaking fuel <br /> underground storage tank (LUST) sites within a half-mile radius of the subject property. <br /> However, the LUST sites have been closed for over 14 and 23 years, respectively. Based <br /> on the status of the sites and the distance and direction from the subject property, the <br /> LUST sites should not impact the subject property. The review did not reveal any other <br /> sites of environmental concern within a half-mile radius of the site. <br /> 4.3. ON-SITE EXISTING WELL DESCRIPTION <br /> There are no active water wells at the subject property that are in use. There is one <br /> capped, out-of-service, water well on the property. <br /> 5.0. SOIL PROFILE <br /> An OWTS Permit was issued for the property by the EHD on 12 May 2020 to perform a <br /> percolation test(Appendix C). On 21 May 2020, a 4-inch diameter hand auger was utilized <br /> to advance a percolation test hole to 42 inches bsg, in the proposed septic system <br /> disposal field area. <br /> A plan of the specific site features including the percolation test hole locations <br /> (i.e., structures, drives, wells, septic systems, large trees, pastures, pools, natural <br /> drainage courses, ponds, waterways, etc.) is illustrated in Figure 2. <br /> 5.1. SOIL PROFILE PIT INCLUDING DEPTH AND DIMENSIONS <br /> The percolation test hole was located in the disposal field area of the proposed septic <br /> system. The percolation test hole was advanced to a depth of 42 inches bsg using a four- <br /> inch diameter hand auger (Figure 2). <br /> 5.2. SOIL LITHOLOGY AS RELATED TO FUTURE ONSITE SEPTIC USES <br /> The soil was visually described in accordance with the Unified Soil Classification System <br /> (USCS) by a representative of AGI under the supervision of a California Professional <br /> Geologist. The soil collected from the percolation test hole boring consisted of dry, silty <br />