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§ 4.0 EVALUATION OF PAST AND CURRENT SOURCES OF CONTAMINATION IDENTIFIED AT OR NEAR THE SITE AND RECOMMENDATIONS FOR FURTHER ACTION § 4.1 Evaluation of each potential and/or known source of contamination identified in the above Sections have been discussed in the respective Sections to facilitate the transfer of information to the reader. § 5.0 CONCLUSIONS AND RECOMMENDATIONS § 5.1 Evaluation of each point source potential contamination described(i.e., existing and future septic systems, check valves, the nearest leaking underground storage tanks, electrical transformers and de minimus items, as noted below; and non-point sources (i.e., on-site and / surrounding agrichemical application and non-target drift, nitrate from on-site fertilizer applications,possible DBCP groundwater contamination, and possible DDT soil concentrations)pose a low-to-insignificant risk to the environment and to human health. The ASTM E-1527-00 Document referenced on Page 2 refers to de minimus environmental conditions. De minimus conditions generally do not present a material risk to public health or to the environment and generally would not include an enforcement action if observed by the appropriate governmental agencies. Household hazardous materials may be considered de minimus concerns if there has been no spillage or dumping. Spillage and dumping of a hazardous substance were not observed at the on-site residential structures. The two existing homes on the property may contain lead paint, asbestos or hazardous materials that may or may not be typical. Typical household"hazardous materials"include gasoline,paint thinners, new and used motor oil, antifreeze, etc. Section 9-905.12 of San Joaquin County Development Title states "Corrective Action: If the report indicates there are surface and subsurface contamination, corrective action shall be recommended in the report and concurred with by Environmental Health prior to the issuance of the building permit." Therefore, it is my professional opinion that no corrective + > f action is required on the four proposed Parcels that are to compose the subject property. The septic system density is low on the property and surrounding areas. Consequently, the degree of nitrate-nitrogen impact from this source can be considered inconsequential in 1 5 > comparison to higher density, rural areas. Nitrate impact would be considerably greater from agricultural production land. Page -7- Chesney Consulting