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§ 1.0 INTRODUCTION AND PROPOSED DEVELOPMEN7was This Surface and Subsurface Contamination Report(SSCR)contains the results of my findings subject property located at 5100 West Lehman Road, southeast of Tracy, California. This report prepared for the owner of the property: Mr. and Mrs. Ralph and Dorothy Ruiz and their son, Mr. Mark Ruiz who is coordinating this Minor Subdivision. The purpose of this Report was to investigate and identify real or potential surface and subsurface contamination existing within, or around the entire subject property and report the results to the San Joaquin County Environmental Health Department (EHD). Within the text of this Report, bolded Section (§) numbers are referenced at the beginning of an applicable Section number, sentence, paragraph or Appendices that correspond with the EHD Requirements Checklist for Surface and Subsurface Contamination Reports. According to the San Joaquin County Development Title, a Surface and Subsurface Contamination Report is required at the time of Tentative Map submittal. The Development Title, Section 9-905.12 (a) states"A Surface and Subsurface Contamination Report shall identify any potential sources of surface and subsurface contamination caused by past or current land uses." The report shall include evaluation of nonpoint sources of hazardous materials including agricultural chemical residues and nitrate concentrations in the underlying groundwater. Potential point sources include fuel tanks, discarded items, past and present on-site septic systems, agrichemical applications, lead paint, asbestos, and electrical transformers. No chemical analysis was conducted by Chesney Consulting for this investigation, nor was there an inspection and testing of the on-site residential structure for asbestos containing materials (ACMs)and/or lead paint. Since the Ruiz's residential structure was built in 1974, there is a potential for the two contaminants of asbestos and lead paint to exist. Interpretation of County Ordinance Section 9-905.12 (a)has been to focus on the subject property exclusively, unless it is documented or observed that an environmental concern in proximity to the subject property could potentially affect said property. The Surface and Subsurface Contamination approaches, but does not encompass the requirements of a Phase I Environmental Site Assessment(ESA)as promulgated by the American Society of Testing and Materials(ASTM E-1527-00). The Environmental Health Department recognizes that the Surface and Subsurface Contamination Report is not intended to completely fulfill the requirements of the Phase 1 ESA. The Department does however, maintain that certain components of the Phase I ESA must be applicable to the SSCR,as follows: Section 7.1.7 of the ASTM Document states under"Sources of Standard Source Information,"that "information or other record information from government agencies may be obtained directly from appropriate government agencies or from commercial services." § 1.1 The description of the site and the project is as follows: The existing subject Parcel consists of 50.84 acres net, as described by the APN Map Book. It is proposed to re-establish through a Minor Subdivision, a Homesite Parcel of 2.00 acres in the northeast corner of the property,and a remainder Parcel that has yet to be designated either as the Remainder Parcel or as a numbered Parcel. This designation will make a difference regarding the perc testing required for LLcompletion of the Soil Suitability Study for this project. Page -2- Chesney Consulting