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'..1Phase I Environmental Site Assessment East Main Street,Stockton,California December 10,2004 Page 17 V Questionnaires, interviews, and the SJCEHD file review indicate that groundwater beneath the Site has been impacted by metallic compounds from the MCT Facility. As groundwater from the irrigation wells has been applied to the Site, there is the possibility of an accumulation of chromium and chromium VI in the soil. It is Condor's opinion that the chromium contaminated groundwater beneath the Site is a recognized environmental condition pursuant to the ASTM Standard. Condor recommends that the Site CS. soil be tested for metals before development begins. It is Condor's opinion that there are no factors relating to the Site that could be considered historical recognized environmental conditions pursuant to the ASTM Standard. L It is Condor's opinion that the presence of debris, a discarded automobile, two agricultural irrigation wells, and a possibly PCB-containing electrical transformer located along the western half(APN 173- 210-05) of the northern Site boundary constitute de minimis conditions pursuant to the ASTM Standard. There are no indications of leakage on the transformer or on the soil beneath the transformer. Wells can be conduits for contamination between groundwater and the surface and should be properly abandoned (s 1) ` prior to development. De minimis conditions generally do not present a material risk of harm to public health or the environment and would not be the subject of an enforcement action if brought to the attention of appropriate governmental agencies. All opinions expressed herein are based upon the evidence reviewed and the assumptions made during the assessment. 10.0 CONCLUSIONS Condor has performed a Phase I ESA in conformance with the scope and limitations of ASTM Practice E 1527-00 for APNs 173-210-04, 173-210-05, 173-210-06, and 173-210-07 in Stockton, California. Any exceptions to, or deletions from, this practice are noted in Section 11.0 of this report. The assessment revealed evidence of two recognized environmental conditions in association with the Site: ` • The application and accumulation of pesticides on the Site properties. • The chromium contamination in the groundwater beneath the Site properties. It is Condor's recommendation that the two Site irrigation wells be closed according to San Joaquin County Environmental Health Department's standards to prevent a pathway to humans from the chromium-contaminated groundwater. Condor also recommends soil sampling for total and hexavalent �S r. chromium, arsenic, and copper to evaluate concentrations of these metals in the Site soils. The assessment revealed evidence of no historical recognized environmental conditions in association with the Site. The assessment revealed evidence of several de minimis conditions in association with the Site: ` • The two irrigation wells remaining on Site should be properly abandoned prior to development. Wells can be conduits for contamination between groundwater and the surface. • One possible PCB-containing transformer located along the western half(APN 173-210- 05) of the northern Site boundary, which has no apparent oil staining on the transformer or on the soil beneath. • A discarded automobile along the central portion of the southern Site boundary. t.r1 CONDO