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I=TSI r_00R SAGE 02 <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Una Supervisors <br /> Donua K Asran,R E N S P i <br /> " 304 East Weber Avenue,Third Floor Carl Sorgmaa R E H S <br /> t Director l <br /> c Olsen,R E H S Stockton, California 95202-270$ Mike F;ums P,E H S,R Dnon las W Wilson,R E FI S <br /> v Pro ram Mana er g <br /> 0"''� Laurie A Cotvlla,R E Ff S Telephone (209)468-3420 Margaret Lagono,R it H S <br /> Program kfanager Fax (209) 464-0139 Robert McCiellon R E H S <br /> Mark Rarcellos R E H S <br /> JOE ALDRIDGE <br /> ULTRAMAR INC <br /> 685 W THIRD STREET <br /> HANFORD CA 93230 <br /> RE Beacon #641 SITE CODE 1125 <br /> 1210 E Hammer Lane RO# 000070 <br /> Stockton, CA <br /> WORK PLAN "Additional Groundwater Investigation and Installation of <br /> Interim Soil Vapor Extraction (SVE) System" <br /> DATED September 9, 2002 <br /> PREPARED BY Horizon Environmental Inc - Rexford K. Smith, RG#5307 <br /> • STATUS APPROVED with comments noted below <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE.WORK PLAN [H&S <br /> 25299 37. subd(c)(3)1 <br /> Under dual-phased approach, install four onsite CPTs and one <br /> offsite CPT to approximately 100' bgs in Phase I and collect and <br /> analyze soil and groundwater samples for lateral and vertical <br /> delineation of petroleum impact to subsurface as required by EHD <br /> and, <br /> • Based on results of CPT findings, install PVC monitoring wells in <br /> Phase 11 under a work plan addendum at depths of concern and <br /> develop, survey, and add new wells to existing quarterly monitoring <br /> and reporting requirements and, <br /> • Under "Interim remedial action". install PVC piping to existing vapor <br /> extraction wells, install SVE unit, operate and test under San <br /> Joaquin County Unified Air Pollution Control permits, and report <br /> findings to EHD <br />