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5 <br />n <br />rA <br />E <br />10 <br />11 <br />Identified Contamination Source Evaluation <br />Agricultural chemicals are stored <br />within metal storage containers on <br />the Site. Two plastic tanks of <br />glyphosate and a mobile spray tank <br />were observed nearby. Used <br />chemical containers are stored <br />within a fenced area. (Current on- <br />site) <br />Mechanical repair to equipment is <br />occasionally performed on the Site. <br />(Current on-site) <br />Several used tires and a mattress <br />were observed on the Site. <br />(Current on-site) <br />Five pole -mounted transformers <br />were observed on the Site. Two of <br />the transformers were marked with <br />blue stickers indicating they are <br />free of polychlorinated biphenyls. <br />(Current on-site) <br />According to permit records, one to <br />four ground -water monitoring wells <br />were drilled and abandoned on the <br />Site in 1988 as part of a larger <br />investigation of the Santos Ranch <br />area. (Past on-site) <br />Three listed facilities were identified <br />within one-quarter mile of the Site. <br />Two of these are related to former <br />crude oil pipelines running along <br />Byron Road to the east of the Site. <br />(Current and past off-site) <br />According to the map reviewed, <br />some wells within one mile of the <br />Site have exhibited levels of nitrate <br />over the MCL of 10 mg/L-N. <br />(Current off-site) <br />The San Joaquin County <br />Agricultural Commissioner's office <br />and Environmental Health <br />Department provide regulatory <br />oversight for agricultural chemical <br />application and storage. <br />No evidence of staining was <br />observed. <br />It is anticipated that these items will <br />be appropriately disposed as part of <br />routine upkeep of the Site. <br />The utility provider may have <br />additional information about PCB <br />content of the transformers. <br />No further information regarding the <br />well(s) was encountered. No <br />evidence was encountered to <br />indicate whether the well(s) were <br />used for environmental monitoring <br />or depth -to -water monitoring. <br />Based on the records reviewed, no <br />evidence was identified of impacts <br />to the subject Site from these <br />facilities. <br />The domestic well on the Site will be <br />tested for nitrate as part of the Soil <br />Suitability/Nitrate Loading Study to <br />follow this report. <br />LOGE 2214 10 <br />