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r <br /> City of Stockton, Fire Station No. 12 A69105.01 <br /> August 7, 1995 Page 3 <br /> ..:. <br /> .... <br /> SUI 'Y <br /> A1 . <br /> AT1Ti1LY'1T [JITS. :::;:;:°»OR51LSL1k12TS . :: : >.::'. :':> <br /> . : . <br /> .... <br /> Date af;Samplu .Nwem„tiss 7 I99 ::;:: ;:.;::::.:..,:: :>`'> .......... <br /> r Sample Depth TPH-G TPH-D Benzene Toluene Ethyl Xylenes <br /> Number FBSG mg/kg mg/kg mg/kg mg/kg benzene mg/kg <br /> mg/kg <br /> BS-1 14 ND ND 0.005 0.012 0.005 0.059 <br /> EW 12.5 ND ND ND ND ND ND <br /> SW 12 1.4 ND ND 0.007 ND 0.051 <br /> r <br /> NW 10-5 6.6 27 ND 0.037 0.045 0.48 <br /> W W 10 ND ND ND ND ND ND <br /> SP-1-2 N/A 20 24 0.014 0.062 0.093 0.50 <br /> DLR 1.0 10 0.005 0.005 0.005 0.005 <br /> r <br /> TPH-G = total petroleum hydrocarbons-gasoline range <br /> TPH-D = total petroleum hydrocarbons-diesel range <br /> mg/kg = milligrams per kilogram <br /> r <br /> ND = Not detected at or above DLR <br /> DLR = Detection limit for reporting purposes. <br /> FBSG = feet below site grade(approximate) <br /> low According to the City of Stockton, San Joaquin County Public Health Services (SJCPHS) <br /> requested that additional work be conducted to delineate the lateral and vertical extent of <br /> PPC impacted soil. <br /> Vr <br /> The City of Stockton Department of Public Works retained Twining to act on this request. <br /> Twining prepared and submitted a work plan (Twining, 1995) for a preliminary site <br /> characterization on March 10, 1995. This work plan was approved by SJCPHS on March <br /> 14, 1995. The results of this characterization are summarized in the following text. <br /> r <br /> 3.0 PURPOSE AND SCOPE <br /> The purpose of this site characterization was to assess the extent of PPC migration in soil <br /> at the site. The following work scope was performed to achieve the above referenced <br /> objective: <br /> • Four soil borings (B-1 through B-4) were drilled and subsurface soil samples collected <br /> for chemical analysis; <br /> • Selected soil samples were chemically analyzed in the laboratory for key PPCs; <br /> r <br /> 1r <br /> r <br />