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HF'K er 'tO We:ddFM 4LLHM4H1LK bKUI-Jr <br /> '4000C <br /> LEL � <br /> WT <br /> A 1 <br /> C R U U P, I N C. <br /> ,A,pril.27, 1994 ' <br /> Ms. Margaret Lagono <br /> Environmental- Health Division <br /> San Joaquin County Public Health Services <br /> PO Box 388 <br /> Stockton, CA 957,01-0388 <br /> Re: Soil Stockpile located at 7735 South Highway 99, Stockton <br /> Dear his. Lagorio, <br /> This morning, after speaking with Brooke Birkie of Neurniller and Beardslee, I <br /> checked•the project'file and found a letter from Markus Niebanck of Clearwater <br /> which was sent to you ort April 17th. In the letter Markus established the ratio in <br /> which soil samples were- to be composited and analyzed. Stockpile soil samples <br /> tested for TPH as gasoline/BTEX and TFH as diesel should have been composited ori <br /> a 2:1 ratio. <br /> Unfortunately, the TFHg, TPHd, and BTEX stockpile samples were combined on a <br /> 4:1 ,ratio. However, after speaking to Ron Buxton, Lab Manager for American <br /> Environmental Network Laboratory, I believe that we can still utilize the results of <br /> this sampling event to make the determination for site closure. Please refer to the <br /> attached table which shows the maximum possible contaminant level for an <br /> individual sample. Maximum reporting limits per sample would be four times the <br /> reporting limit used for the composite. For each analyte, four times the reporting <br /> limit is still lower than the left in place concentrations agreed to by Markus and <br /> yourself. <br /> I apologize for this error. This kind of a mistake should never have been trade. I <br /> understand that you and Markus had agreed to a specific plan and that the plan was <br /> not followed due to an error made by the sample collector. However, the chain of <br /> custody should have been reviewed by the project manager to ensure the efficient <br /> execution of the agreed to sampling plan. <br /> 1125 Atianfic Avemie•SWte 102 0 Aland &•Califomia 94M,(510)337-8730*Fax(510)52 W)84 <br />