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O _ <br /> ENVIRONMENTALTECHNOLOGIESCORPORATION J � .y �/!( <br /> _ <br /> August 25, 1997 <br /> 94331 <br /> Ms Margaret Lagono <br /> San Joaquin County <br /> PHS/EHD <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, Califorma 95202 <br /> Subject Addendum to Closure Request Report for Holt Bros , 1541 West Charter Way, <br /> Stockton, California <br /> Dear Ms Lagono <br /> Smith Technology Corporation has prepared this addendum to the Smlth Technology Corporation <br /> Closure Request Report, dated June 18, 1997 This addendum has been prepared to address the <br /> concerns mentioned in our telephone conversation regarding the closure report The following <br /> items were addressed <br /> o Table 1, Summary of Tank Removal Soil Analytical Results, has been revised to show <br /> corrected sample Ids Table 1 is attached <br /> • The former 3,000-gallon waste oil tank has been added to Figure 2, titled Former Tank <br /> Locations, and Figure 3, titled Soil Boring and Monitoring Wells Figures 2 and 3 are <br /> attached <br /> • Figure 4, which shows the estimated extent of contamination and limits of excavation, has <br /> been revised to show the ramp area of the former excavation, the area of original <br /> contamination, and the area of residual contamination Figure 4 1s attached <br /> • Calculations showing the mass of residual contamination remaining in the soil are included in <br /> Attachment 1 Calculations were based on analytical results of confirmation soil samples <br /> collected from the sidewalls and bottom of the soil excavation by Foothill Engineering The <br /> total mass of total petroleum hydrocarbons as diesel remaining in soil is estimated to be 335 2 <br /> pounds Benzene was only detected in one soil sample and the total mass of benzene is <br /> estimated to be 6 8 pounds Total petroleum hydrocarbons as gasoline were not detected in <br /> any of the confirmation soil samples <br /> w\943311rcportslltradd doe 1 <br /> 1260 Graphics Drive Modesto,CA 95351-1502 (209)579-2221 Fax(209)579-2225 <br /> Engineering Consulting Remediation Construction <br />