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• <br /> Peterson Technical Services <br /> - - --- - RECEIVED <br /> Inv <br /> December 1 , 1988 rr''� �; a �C Q w 1988 <br /> SA, OAQUIN COUNT <br /> Mr . Chet Davisson, Director 121938 PLANNING DIVISIOr,, <br /> San Joaquin County ENS'IRCNINAI=NTA(_ HEALTH <br /> Department of Planning and Building In",W}ItA. i4VICES <br /> 1810 E. Hazelton Avenue <br /> Stockton, California 95205 <br /> Dear Mr . Davisson: <br /> I am sending you this letter , at the request of Dr. Helmuth <br /> Hoff , in order to outline for you the current plan for sampling <br /> the soil and groundwater on the Woodson Estates property , for the <br /> purpose of characterizing the potential risk which may exist as <br /> a result of the presence , if any , of chemicals identified by the <br /> California Department of Health Services (CDHS) during their site <br /> evaluation of Lodi Airport. The Lodi Airport has been scheduled <br /> by CDHS for clean-up as a hazardous waste site under the <br /> Hazardous , Substance Clean-up Bond Act of 1984 as a result of the <br /> presence of identified hazardous chemicals on airport grounds. <br /> The potential risk to humans from any identified chemicals <br /> will be calculated as a function of toxicity of the specific <br /> chemical substance , coupled with the level and duration of <br /> exposure. The exposure pathways to be considered are inhalation <br /> (fugitive dust) , direct contact (dermal exposure) , and ingestion <br /> (drinking water) . <br /> Development of sampling protocol will be coordinated with <br /> scientists within the Toxic Substances Control Division of the <br /> California Department of Health Services. Risk assessments will <br /> be conducted by following the guidelines within the California <br /> Department of Health Services , "Decision Tree Manual" . <br /> Sampling Program: <br /> 1 , Soil <br /> In order to evaluate a worst case exposure situation soil <br /> samples will be taken from Woodson Estate p r o p e r t y at <br /> locations immediately opposite the aircraft wash down area <br /> ( south side of Jahant Road at Frontage Road " T " <br /> intersection) , and immediately opposite the hazardous waste <br /> spillage/disposal site (West end of Runway 8/26) . A third <br /> sample site will be located immediately opposite the airport <br /> and between the two locations described above. <br /> 9517 Durango Way Elk Grove, CA 95624 (916) 685-5010 <br />