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and BTEX, and lead concentrations appear to be at background levels. <br /> • All TPH and/or lead soil contamination, if any, appears to have been remediated during <br /> the UST removal and over excavation work conducted in 1985. <br /> • No lead was detected during the two groundwater sampling events performed by Parr, <br /> • The periodic appearance of lead in the groundwater samples collected prior to 1994 <br /> during quarterly monitoring appears to have been the result of lead in sediment being <br /> dissolved into the acidified samples. <br /> • The lack of proper field filtering appears to have been responsible for the presence of lead <br /> in groundwater samples. <br /> RECOMMENDATIONS <br /> • No further assessment or groundwater monitoring is necessary at this site. <br /> • This document should be forwarded to the San Joaquin County PHS/EHD along with a <br /> request for site closure. <br /> Please contact the undersigned at (916) 652-3861 if you have any questions regarding this <br /> submittal. <br /> Sincerely, <br /> t REo Gip <br /> Park vivo rpq� <br /> R" V� <br /> � I <br /> Zlpr• } <br /> No. 1096 <br /> Richard I Zipp, , CCERiiPlEO <br /> Principal Hydrog o 'moo OG,s° <br /> �rFOF CA1.XF <br /> atch. <br /> 5016J1 4 <br />