SU0005186_SSNL - Laserfiche WebLink

Home Browse Search

Within the text of this Report, bolded Section (§)numbers will be referenced at the be7hec applicable sentence, paragraph or Appendix that correspond with the EHD RequiremSection Numbers referenced as SSS§, aze sections applicable for the Soil Suitability S Numbers referenced as NLS§, are sections applicable for the Nitrate Loading Study. II. SOIL SUITABILITY STUDY FINDINGS A. SUBJECT PROPERTY AND SURROUNDING STUDY AREA INFORMATION SSS§ 1.1 The subject property has been in dry-land agricultural production for the past several decades,based upon the Surface and Subsurface Contamination Reports conducted for the San Joaquin County Environmental Health Department. It is bound to the north by a restaurant and a mobile home park. To the east and south, are exclusive,Waal homes. To the west are the Highway 99 Frontage Road, Highway 99 and vineyards on the west side of Highway 99. SSS§2.1 The wide-range surrounding land use of residential structures on septic systems,and upgradient land use which has been in agricultural production for many decades, have contributed to the referenced potential of creating a nitrate problem. Surrounding and upgradient land use is evidenced by the United States Department of Agriculture(USDA) Soil Maps for this area of San Joaquin County, found in Appendix 2. SSS§3.1,3.2,3.3 and 3.6 Applications on file with the County Environmental Health Department reveal that there have been four permits issued for additions and repairs to existing systems in the one- half mile radius study area. This can be considered a comparatively high number of permits. NLS §1.0 B. SOIL PHYSICAL AND CHEMICAL CHARACTERISTICS NLS§1.1 1. SUBSURFACE SOILS UNDER OPEN FALLOW LAND AREA To analytically assess the surface and subsurface soils for comparison purposes, soil samples were retrieved with a truck-mounted drill rig, using solid stem auger with a split spoon sampler. Samples were obtained from every five-foot depth down to 25 feet, under proposed Lot 3 and proposed Lot 10. The exploratory drilling locations of these two borings are denoted on the Tentative Map found in Appendix 4, which also illustrates the percolation test locations. These two boring sites were chosen to compare subsurface soil structures between the southeast area of the project and the northwest area. The soil samples were submitted to A&L Western Agricultural Laboratory for analytical testing under the attached Chain of Custody(Appendix 8). As noted on the Soil Analysis Reports, several constituents were analyzed. "Non-nitrogen" constituents that were tested relating to nitrate loading include the organic matter content of the soil,pH, and the Cation Exchange Capacity(CEC). Page-2- Chesney Consulting