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..i <br /> CITATION CIRCUITS 195OWest Fremont street <br /> ' <br /> Sto kton California 95203 <br /> I N C O R P O R A T E D ! `, I S f , �: 5 (209)466-4000 <br /> November 10 , 1993 <br /> Mr. Doug Wilson , Supervisor <br /> Environmental Health Division <br /> San Joaquin County Public Health Services <br /> 445 N. San Joaquin Street <br /> Stockton , CA 95201 <br /> Dear Mr. Wilson : <br /> Work has been completed on the contaminated soil discovered <br /> in the plating area last July . Following is a summary of <br /> the work performed and samples taken . Analytical results <br /> and sampling locations of each set of samples are attached . <br /> The potential contamination in the soil was first discovered <br /> on July 23, 1993. A representative from your office was <br /> notified the same day . A series of core samples were taken <br /> from different areas of the trench and sent to Weston Labs <br /> for analysis (Weston Batch #93078453) . This set of samples <br /> failed the TTLC. <br /> Approximately one foot of dirt was then removed from the <br /> trench and a second set of samples taken in the trench on <br /> 8-24-93. These samples were likewise sent to Weston Labs <br /> for analysis (Weston Batch 4930BS68B) . This set of samples <br /> also failed the TTLC. <br /> Additional dirt was removed after receiving the second set <br /> of results, and a third set of samples were taken on 9-1-93 <br /> and sent to Weston Labs for analysis (Weston Batch <br /> #93095741 ) . These samples passed the TTLC , so they were <br /> resubmitted for TCLP (Weston Batch '#93095794 ) and STLC <br /> ( Weston Batch #93098850) . All samples passed the TCLP for <br /> lead , but only one (#3) passed the STLC for both copper and <br /> lead. <br /> Some additional dirt was removed from the areas which failed <br /> the STLC, and a fourth set of samples taken on 9-29-93 and <br /> sent to Weston Labs for STLC analysis (Weston Hatch <br /> #9310SOOB) . Both samples passed for both copper and lead . <br /> These samples, also labeled #1 & #2, were taken from the <br /> same locations as samples #1 & #2 taken on 9-1-93 . <br />