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§ 1.0 INTRODUCTION AND PROPOSED DEVELOPMENT This Surface and Subsurface Contamination Report (SSCR) contains the results of my findings for- the subject property located at 19298.South Alder Avenue, Tracy, California. This report was Prepared exclusively for Mr. Paul Larson-the owner of the property, and the San Joaquin County .Environmental Health-Department (EHD). The purpose of this'Report was:to investigate and identify real or potential surface and subsurface-contamination existing within, or adjacent to the entire subject property. 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 Tittle, a Surface and Subsurface Contamination Report is required at the time-ofTentativeMap 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 pastor 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, on-site.septic systems,.agr chemical 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-siteresidential building for asbestos containing materials (ACM§)and lead paint: Interpretation of County Qrdinance:Section 9-905.12 (a) has been to focus on the subject property exclusively, unless it is docuniented or observed that an environmental concern inproximity to the subject property could potentially affect said property. This Surface and Subsurface.Contamination approaches, but does not:encompass the requirements of a Phase I Environmental Site Assessment (ESA) as.promulgate-d 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 I ESA. 'Thi-,"Departmentdoes'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 is as follows. Almost the entire subject.Parcel is used for agricultural row crop production.. Therefore,'the land use is applicable of Agriculture-40 (AG- ✓ 40). The extreme west end of the project contains a sma] ,uninhabited si gle family residential structure, that appears-to have been refurbished recently. is unlikely that this structure contains lead paint and/or asbestos. 'Page -2- Chesney Consulting No domestic'w ssociated with thisF_structure was observed. Aseptic system serves the is stru�ture✓No otfier septic sy`sterns areon the propeityhotographic Plate D shows--a ahole behind the residential stcfure that may be associated with this septic system. The.West property line=is an earthen drainage ditch, with a small concrete lined irrigation ditch.next to the larger earthen ditch Since irrigation water is provided by concrete ditch. conveyance there is no on-site irrigation well. As illustrated on the'Tentative Map found in Appendix A,a thin step of`land exists between the two referenced-ditches. This land is not farmed.and contains some walnut trees, weeds and brush This strip:of land should be periodically monitored since it can be considered a prime location to discard junk, or dump hazardous materials such as those_used in.drug manufacturing. Na dutnping`was observed. § 1,2 Description of.:proposed development is to make no changes to.the subject property,.other _ than a Minor.Subdivision for the creation of two Parcels. The existing 97.58 acre Parcel is proposed-to'be su' divided into Parcel 1 to contain 44.19 acres and Parcel 2 to contain 53.39 acres. As-referenced,:the purpose of this Report is to fulfill the requirements of the EHD by compl'etiori of the SSCR. This minor°subdivision is being completed by the firm of MCR Engineering, Inc. The subject property is in-an agricultural region, as is the entire north side of Interstate 205 and west of Interstate 5 .south of the San.Joaquin River.-Operations affecting environmental conditions -and operations.taking place on the property in the future must be in strict compliance with applicable Codes,of'County.and.State Regulations. § 1.3 "e APN_l'arcel map;the Tentative Map and the District Viewer Map are found in Appendix A. §'1.4 An aerial.view-Google Map shows the location.of all existing items on the subject Parcel, including the existing residential structure. Items on the Parcel include this residential structure, ag production land;dirt roads, and trees. There are no ponds ori the Parcel, arid no natural drainage courses, only man-made drainage structures. Stormwater from the property drains from-the surrounding'cropland, then into the drainage conveyance structures. - § 2.0 PAST,'-PRESENT.AND PROPOSED FUTURE USES OF THE SITE § 2.1 For.mariy.decades;-past use.of-the property has'been as agricultural.production1and planted in row crops:since°the_groundwater.is too.high for permanent crops such as trees. Agriculfiiral°activities on and around the property may have contributed nitrate to the underlying top water:aquifers: .However,.many studies completed near large-water conveyance structures such as rivers and the Delta itself have found the nitrate concentrations-.to be-very.low or nonexistent. Present and anticipated future uses of the property have been defined as continuing in - agricultural production. 4t-is unlikely that-present and future agricultural activities may a = contribute to potentially-significant environmental concerns. Page -3- Chesney Consulting