The City of South Tucson conducted a Phase II field investigation on May 3, 2011. Field Investigation work consisted of driving 10 hand-installed borings to a depth of 18 inches below ground surface bgs or to auger refusal to assess the horizontal extent of SVOCs and 8 RCRA metals State of Arizona Soil Remediation Levels SRLs resulting from potential leaching of wood-preservative chemicals to the ground surface. The soil samples were submitted for analysis of SVOCs and 8 RCRA metals and the City of South Tucson received the analytical report on May 11, 2011. The following information was obtained from the analytical report: � SVOCs were not present above the analytical laboratory method detection limits MDLs in all samples except for SS-8. The following SVOC analytes were present above the applicable analytical laboratory MDLs but below the applicable State of Arizona residential SRLs: Benzoaanthracene, Benzobfluoranthene, Benzoapyrene, Chrysene, Dibenza,hanthracene, Fluoranthene, and Pyrene. � Arsenic, Barium, Chromium, and Lead were present in all 10 samples above the applicable analytical laboratory MDLs but below the applicable State of Arizona residential SRLs. Cadmium, Selenium, Silver, and Mercury were not present above the applicable analytical laboratory MDLs. Based on the results of the Phase II ESA and the results and conclusions provided in the Phase I ESA, the vertical and horizontal extent of SVOCs and 8 RCRA metals have been delineated on the subject property. Therefore, no additional soil sampling is required and no recognized environmental conditions RECs exist at the site.
Former Use: In 1958, the subject property consisted of native desert. The property remained that way until sometime between 1972 and 1980 when the property was cleared and graded. Between 1990 and 1996, an open shade structure was constructed on the western portion of the subject property. Sometime prior to 2007, several telephone poles were installed on the property as part of a ropes course, however prior to 2011 those telephone poles were removed and that portion of the property was left vacant. No other significant changes in use have occurred on the property since the removal of the ropes course.