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1 � <br /> F <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> °P4U�N SAN JOAQUIN COUNTY <br /> Donna K Heran,R.E.H.S. unit Supervisors <br /> Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> • Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> - P <br /> Program Manager Douglas W.Wilson,R.E.H.S. <br /> qLj pRtN� g Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Mark Barcellos,R.E.H.S. <br /> MANUEL & MARY SANCHEZ <br /> 1633 W WALNUT STREET <br /> STOCKTON CA 95203 <br /> Former Underground Storage Tanks SITE CODE: 1844 <br /> 1876 Country Club Blvd RO#: 0000474 <br /> Stockton, CA. 95203 SWRCB-CUF#: 1026 <br /> WORK PLAN: "Addendum to Pump Test with TPH-g Mass in Soil and <br /> Groundwater Calculations." <br /> DATED: October 15, 2002 <br /> PREPARED BY: Western Geo-Engineers—Jack E. Napper, RG. <br /> STATUS: APPROVED <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN rH&S 25299.37, subd(c)f311: <br /> • Install four, two-inch PVC, 'piezometers' near center of groundwater plume in <br /> preparation of groundwater pump test. Two to 18'and two to 27' bgs, complete <br /> with transducers and data loggers. Piezometers to be monitored as 8-hour, <br /> stepped, draw-down tests are conducted from each of the two existing <br /> groundwater extraction wells (RW-1A and RW-113) already installed onsite and, <br /> • Conduct an additional 24-hour, Constant Rate Pump tests on each extraction well <br /> after stepped, draw-down tests. <br /> • Pretreat and dispose of pumped groundwater as described in the WEGE work plan <br /> dated February 28, 2002 and approved by EHD on August 28,2002. <br /> • MW-1 appears to be constructed across two hydrogeological units and could <br /> provide co-mingling of zones and hamper remedial groundwater extraction <br /> feasibility. MW-1 will be properly destroyed under a permit issued by EHD. <br /> • Submit report of findings to EHD. <br /> COMMENTS AND CONDITIONS: <br /> • EHD recommends recording rebound of water levels following each active <br /> pumping test as a second aquifer test via slug test analysis. <br /> REASONS FOR DISAPPROVAL OF THE WORK PLAN rH&S 252,999..377,ssubd c 3 <br /> • None <br /> Michael J. nfurna Jr., Senio EHS Nuel C. Henderson Jr. RG <br /> LOP 1 Site Mitigation Unit I LOP 1 Site Mitigation Unit IV <br /> MI/ <br /> C.- CVRWQCB—Marty Hartzell, Sacramento. <br /> C.' SWRCB—CUF—Mark Owens, Sacramento. p " <br /> c: WEGE—Jack Napper, 1386 E_ Beamer St, Woodland, CA. 95776-6003 <br /> N Faxed to consultant on: Z . <br /> FILE COPS' <br />