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• Ream <br /> IERw► NOV 1 6 2006 <br /> • ENVIRONMErdT HEALTH <br /> PERIv11T/SERVICES <br /> 2302 LARKIN CIRCLE <br /> SPARKS,NEVADA 89431.6587 <br /> PO.BOX 50730 SIERRA CHEMICAL Co. <br /> SPARKS,NEVADA 89435-0730 <br /> TELEPHONE(775)358-0888 <br /> FAX(775)358-0987 November 13, 2006 <br /> E-MAIL sierrachem@gbis.com <br /> Via Fax 209-468-3433 <br /> Via U.S. Mail <br /> Kasey L. Foley <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E. Weber Avenue <br /> 3`d Floor <br /> Stockton, CA 95202 <br /> RE: Soil Sample Results <br /> Sierra Chemical Co. <br /> 1010 Industrial Drive <br /> • Stockton, CA <br /> Dear Ms. Foley, <br /> Please accept this as a response to your September 12, 2006 letter. In your letter you <br /> pointed out that the total lead for sample Sierra Chem-3 was 78 mg/kg which exceeded <br /> the STLC limit of 5 mg/I by more than 10 times and would also need a STLC analysis. <br /> We contacted Western Environmental Testing Lab and obtained the STLC results for <br /> lead for that sample (copy attached). The results were 1.3 mg/I which is far less than the <br /> 5 mg/I limit. <br /> You also recommended we contact Randy Adams with the California Department of <br /> Substances Control relating to the data we had generated. I talked to him and he <br /> informed me there are different cleanup levels for Industrial sites and suggested we look <br /> at the California Health Screening Levels and the Region 9 PRG Tables to determine how <br /> our data compares to see if there is a need for their involvement. <br /> In doing so we find that total chromium is not listed in Table 1(copy attached) of <br /> California Human Health Screening Levels for Soil. Lead and lead compounds is listed <br /> at 3500 mg/kg. We also reviewed the Region 9 PRG tables(copy attached). They list <br /> Preliminary Remediation Goals for soil at industrial sites for total chromium to be 450 <br /> mg/kg and lead to be 800 mg/kg. None of our results approach those levels. <br /> • <br /> neo SPARKS ♦ BATTLE MOUNTAIN ♦ STOCKTON <br />