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City of Stockton A68104 02A <br /> June 6, 1996 Page 5 <br /> TALE 3 <br /> Summary of Graumtlwater Sample Analytical Results <br /> Monitoring Wdl AMI <br /> S ampling Date B T E X TPH-G <br /> kg/L kg/L kg/L pg/L Pg/1106/30/95 ND ND ND ND ND <br /> 09/26/95 ND ND ND ND ND <br /> DLR 05 05 05 05 50 <br /> Ag/L = micrograms per liter <br /> BTEX = benzene, toluene,ethylbenzene, xylenes <br /> ITH-G : total petroleum hydrocarbons-gasoline range <br /> ND = Not detected at or above detection limit for reporting purposes <br /> DLR = Detection limits for reporting purposes <br /> Purge water generated during monitoring well development and groundwater sampling was <br /> containerized in DOT-approved steel drums These drums were stored on-site <br /> Based on the findings of the soil and groundwater assessment work, Twining offered the <br /> following conclusions (Twining, 1995) <br /> • PPC migration in soil appears to have extended vertically no deeper than 20 feet <br /> P <br /> BSG beneath the former UST location, <br />' • PPC migration in soil appears to have extended laterally no more than 10 feet from <br /> the former UST location, <br />' • Based on analytical results of groundwater sampling analysis, it does not appear that <br /> PPCs in soil have migrated to groundwater below the former UST location <br />' In a letter dated December 5 1995 then <br /> San Joaquin County Public Health Services <br />' (SJCPHS) directed that an estimate of the residual soil contamination and a work plan to <br /> destroy the monitoring well be submitted to their office The City of Stockton <br /> commissioned Twining to comply with the SJCPHS request on February 15, 1996 The <br /> following sections contain a proposed work plan to meet the SJCPHS requirements SJCPHS <br />