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t' CCONCLUSIONS, OPINIONS AND RECOMMENDATIONS n compliance with Section(c) of San Joaquin County Development Title 9-905.12, which states Corrective Action: If the report indicates there are surface and subsurface contamination, orrective action shall be recommended in the report and concurred with by Environmental Health prior to the issuance of the building permit." As referenced above, time was of the essence to complete this report as quickly as possible at the time it was initiated. Due to real estate transaction problems, the transfer took much longer than anticipated. Therefore, the "Corrective Action" of removing the buried material was conducted simultaneously with this Surface and Subsurface Contamination Report. By excavating and removing the encountered buried material, "due diligence" corrective action has been taken on the subject property. It is important to note that it is obviously impossible to excavate and examine every cubic yard of soil underlying the subject property. Therefore, other buried artifacts may remain under the subject property in locations not excavated. However, based upon: 1.) professional judgement regarding the historical aerial photographs, and 2.) considering the orientation of the existing trees and the extremely hard soil encountered during the backhoe excavations in locations other than the southwest comer of the property, it is our opinion that additional buried material is unlikely. In the event that any subsurface foreign material or artifacts are uncovered during earthwork or underground procedures in the course of property improvement,the San Joaquin County Environmental Health Department(EHD)must be contacted immediately. Although methane gas was discovered at the World Enterprises Landfill site, it is our opinion that it is improbable methane gas could migrate through the native, undisturbed soil and impact the subject property, given the high degree of density and compactness of the soil. It is possible, however,that methane gas migration may travel along disturbed soil pathways such as piping located in trench backfills. For compliance with Title 27, Section 21190, Item(g), of the California Code of Regulations (CCR), it is recommended that the southwest property boundary of the Landfill be accurately surveyed and a 1,000 foot radius line be drawn from this point to determine which proposed lots the subject property must comply with the stated Regulation. Testing of the soil for agrichemical residues is not recommended because the subject property appears to have not been "farmed" to an economic level that would warrant or justify the use of pesticides. This opinion is based upon the historical aerial photographs and recollections of the three references who have lived in this area all their lives. Based upon information obtained from the Environmental Data Resources Radius Map documenting sites of environmental concern, it is highly unlikely any site listed could affect the subject property. It is important to note that other sites of concern in proximity to the subject property that are not publicly listed,may have the potential to adversely affect surrounding properties. Page -6- Chesney Consulting