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L ! <br /> McLaren Environmental Engineering 7-1 5 <br /> i <br /> APR 4 1989 <br /> April 3, 1989 [ <br /> I-{ J <br /> 'EA TI <br /> Ms. Diane Hinson <br /> San Joaquin Local Health District <br /> 1601 East Hazelton Avenue <br /> Stockton, California 95201 <br /> Dear Ms. Hinson: <br /> FORD NEW HOLLAND PRELIMINARY REPORT ADDENDUM <br /> Introduction <br /> This addendum to the October 1988 Ford New Holland Preliminary Report sets <br /> forth a workplan for further site assessment at the Ford New Holland <br /> dealership located at 2150 West Charter Way, Stockton-, California. <br /> Additional site assessment work is proposed based on the results of the <br /> initial site assessment, which was performed on November 18 through <br /> November 21, 1988, as described in the January 1989 Ford New Holland Site <br /> Assessment Report. Four soil borings which were completed as shallow <br /> groundwater monitor wells, MW-1 through MW-4, have been drilled at the <br /> locations shown in Figure 1. As described in the January 1989 Site <br /> Assessment Report, results reported for TPH and TVA analyses of soil <br /> samples collected from the borings show no detectable concentrations of <br /> these compounds. Results of TPH and TVA analyses of groundwater samples <br /> taken from the four monitor wells and results of organic lead and EDB <br /> analyses from MW-1 show no detectable concentrations of these compounds. <br /> However, since the soil and groundwater samples collected by Trace <br /> Analysis following tank removal showed elevated concentrations of <br /> petroleum hydrocarbons and related aromatic compounds beneath the former <br /> tank site, as described in the October 1988 Preliminary Report and in the <br /> January 1989 Site Assessment Report, additional site assessment work is <br /> proposed. <br /> Proposed Additional Site Assessment Work <br /> Additional site assessment work is proposed to evaluate the presence of <br /> elevated concentrations of petroleum hydrocarbons and related chemicals <br /> in soil and groundwater within the tank excavation and in the tank <br /> excavation spoils. To confirm soil conditions within the tank excavation, <br /> four sidewall soil samples will be collected and analyzed for total <br /> petroleum hydrocarbons by EPA Method 8015 (modified) and for volatile <br /> aromatic compounds by EPA Method 8020. The samples will be taken at 18 <br /> 11101 White Rock Road, Rancho Cordova, CA 95670(916) 638-3696 <br />