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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 The subject property contains garbage/trash, as noted in the photographic plates. This includes mattresses, an electrical pole, a canvas umbrella, wood, paper, and concrete pieces. None of these materials can be considered hazardous. No hazardous materials were observed, nor was there soil staining or stressed vegetation that may be indicators of hazardous materials. Evaluation of each point -source potential contamination described (i.e., the referenced discarded materials, the electrical transformer, air plumes) and non -point sources (i.e., possible nitrate in the underlying groundwater) pose an infinitesimal risk to the, subject property and to human health. Historical septic system density at one time could be considered dense; however, now the area is served by Municipal Stockton sewer and Cal Water Services. It is assumed there will be the need for soil importation to backfill the soil depressions and raise building pads. This imported soil must have assurance that it is clean and the proper compaction procedures implemented. It is virtually impossible that any of the referenced ERS point -source sites could affect groundwater, soil or air over and under the property. There are no observable aboveground storage tanks nor underground tank appurtenances on the property. Therefore, it may be considered almost impossible that any tanks in this locale may affect the property because of the distances involved. The ASTM E-1527-05 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. The referenced discards/garbage/trash can be considered de minimus conditions. 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." It is my professional opinion that no corrective action is required regarding the subject property, other than the proper disposal of the garbage and trash referenced. Page -6- Chesney Consulting