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ENVIROKMENTAL HEALT14DEPARTMENT <br /> °U!" SAN JOAQUIN COUNTY <br /> G <br /> Donna K.Heran,R.E.H.S. Unit Supervisors <br /> r '{ Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> A1.01sen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> ` Douglas W.Wilson,R.E.H.S. <br /> Program Manager Telephone: 209 468-3420 Margaret La orio R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 <br /> Mark Barcellos,R.E.H.S. � <br /> i <br /> DEN AND BETTY UEDA <br /> DEN' S AUTO REPAIR <br /> 626 E GAUN ROAD <br /> FRENCH CAMP CA 95231 <br /> RE: DEN'S AUTO REPAIR SITE CODE: 1085 <br /> 308 SOUTH EL DORADO ST <br /> STOCKTON CA 95231 <br /> WORKPLAN: Additional Site Assessment Work Plan DATED: July 19; 2005 <br /> PREPARED BY: Advanced GeoEnvironmental Inc. <br /> APPROVED with Conditions (See Below) <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN (H&S <br /> 25296.10(c)(3): <br /> Advance total of 7 soil borings usina hollow-stem augers. The borings will be converted <br /> to monitoring wells: <br /> 1. Two borings on site to 65 feet below surface grade (bsg) and 120 feet bsg, <br /> screened from 60 to 65 feet bsg and 110 to 120 feet bsg,respectively. <br /> 2. - One boring south of the former waste oil tank (T4) to 65 feet bsg, screened from <br /> 60 to 65 feet bsg. <br /> 3. One boring between MW-1 and MW-2 to 120 feet bsg, screened from 110 to <br /> 120 feet bsg. <br /> 4. Three borings off site near CPT-3 to 45, 65, and 120 feet bsg, screened from 25 <br /> to 45 feet bsg, 60 to 65 feet bsg, and 110 to 120 feet bsg,respectively. <br /> Soil samples will not be collected from borings to 120 feet bsg. Soil samples will be <br /> corrected at 5-foot intervals from the remaining 4 borings for potentially laboratory <br /> testing. <br /> The new monitoring wells will be developed,properly surveyed, and sampled for TPH-g <br /> using EPA Method 8015, and BTEX, five oxygenates, and 1,2-DCA and EDB using <br /> EPA Method 8260B. <br /> COMMENTS AND CONDITIONS <br /> Implement the proposed work by August 31, 2005. <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN (H&S 25296.10(C)(3): <br /> None <br /> ZDATED July26 2005 BY C, <br /> Cc: Advanced GeoEnvironmental, Inc. =Eyrene Fisher <br /> Cc: RWQCB, Central Valley Region—James L.L. Barton,PG <br />