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ti <br /> The results of the April 25, 2012, assessment were provided to the San Joaquin County <br /> Environmental Health Department (SJCEHD) for their evaluation and regulatory review. <br /> SJCEHD subsequently issued permits for the subsurface exploration necessary for the <br /> additional assessment. <br /> September 25, 2012 — PEI completed additional subsurface work in August 2012 and <br /> summarized it in an addendum to the Limited Phase II Assessment. The scope of work to further <br /> evaluate areas of concern identified in the April 25, 2012, report included the drilling of eight <br /> soil borings in the identified areas of concern, with the intent of collecting soil and groundwater <br /> samples. Seven borings were completed to groundwater. Drilling refusal was encountered in one <br /> boring, which precluded groundwater sampling. Based upon the soil and groundwater sampling <br /> completed at the site,the UST graves and patches inside the building were identified as requiring <br /> no additional assessment. However, concentrations of benzene and 1,2-dichloropropane above <br /> MCLS were found in groundwater samples associated with the septic system. Therefore, PEI <br /> concluded that the septic system represents a source area that has impacted the subsurface. The <br /> boring and temporary well locations of the August investigation are shown, together with the <br /> April boring locations, on Figure 6. <br /> Analytical data from PEI's previous subsurface investigations are summarized in Tables 1 <br /> through 10 below. The VOC groundwater data from both the April & August 2012 field work <br /> are combined in Table 9. PEI's April and August 2012 subsurface investigations are included <br /> as Volume 11. <br />