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Re-Manufacturing, Ltd. -3- 17 October 1991 <br /> Inspection Report <br /> and if it has reached ground water. Ground water at the site is roughly 60 feet below <br /> ground surface. <br /> Michael Infurna, from San Joaquin County Public Health Services, also inspected the <br /> site. He was interested in observing the grouting of the borings. More borings were <br /> sampled after I left and the following day. I did not return to the site to observe. <br /> SAMPLE RESULTS: <br /> REG. BOARD WATER WORK <br /> Sample I.D. Total Lead Total Lead <br /> SB-1 @ 5' 4,000 2,210 <br /> SB-2 @ 5' 92 48 <br /> SB-3 @ 5' 15 1,090 <br /> SB-4 @ 5' 22 7. 1 <br /> SB-5 @ 5' 5,000 3,650 <br /> SB-6 @ 5' 4, 100 775 <br /> SB-8 @ 6' 13,000 21,700 <br /> All result are in mg/kg. ICP metals were also run on samples SB-5 and SB-8. The <br /> results are attached. <br /> INSPECTION SUMMARY: <br /> Samples collected at roughly 5 or 6 feet below ground surface from borings SB-1 through <br /> SB-6 and SB-8 were split between Re-Manufacturing and the Regional Board. The lead <br /> results from the two labs were not in very good agreement. <br /> According to the ICP results for SB-5 and SB-8 (see attached data sheets) , lead appears <br /> to be the metal of greatest concern in the fill area. None of the other metals <br /> analyzed were in concentrations above the Total Threshold Limit Concentration (TTLC) . <br /> However, the total concentrations of cadmium and copper were greater than or equal to <br /> ten times the Soluble Threshold Limit Concentration (STLC) in both samples. That means <br /> if a citrate waste extraction test were performed, it is possible that the extract <br /> would have hazardous concentrations of cadmium and/or copper. The two samples were <br /> analyzed for total chromium only. Hexavalent chromium was not analyzed. The total <br /> chromium concentrations were ten times the STLC for hexavalent chromium, but not <br /> greater than ten times the STLC for total chromium. <br /> JEAN McCUE <br /> ater Resource Control Engineer <br /> Attachments <br /> JEM:jm <br />