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9 ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY Unit 5u ervisors. <br /> ..Co P <br /> z.r-`:• ., ' 3'•2 Donna K.Heran,R.E.H.S. ' Turd F1o0I Carl Borgman,R.E.H.S. <br /> Q:. � 304 East Weber Avenue, <br /> �*. i}. Director 1 Mike Huggins,R.E.H.S.,R.D.1: <br /> Al Olsen,R.E.H.S. Stockton,;California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • C1.7. --. �e Program Manager Tele hone. (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Q�� oR�' P Robert McClellon,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Fax: (209) 464-0138 <br /> s Program Manager Mark Bareellos,R.E.H.S. <br /> JOE ALDRIDGE FILE Copy <br /> ULTRAMAR INC <br /> 685 W THIRD STREET <br /> HANFORD CA 93230 <br /> RE: Beacon #641 <br /> SITE CODE: 1125 <br /> 1210 E. Hammer Lane ROM 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�L <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 II 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 /> if <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 />