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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> N 304 East Weber Avenue, Third Floor <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. StoClCtOn, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • o.. Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> 4 FORt� <br /> Laurie A.Cotulla,R.E.H.S. Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> ROBERT ALDENHUYSEN APR 23 2004 <br /> RMC PACIFIC MATERIALS <br /> PO BOX 5252 <br /> PLEASANTON CA 94566 <br /> RE: RNIC Lone Star Kerlinger Aggr. Plant Site Code: 1737 <br /> 30350 S TRACY BLVD <br /> TRACY, CA 95376 <br /> WORKPLAN: Remedial Soil and Groundwater Investigation Sampling Plan <br /> DATED: February 13, 2004 <br /> PREPARED BY: RMC Pacific Materials <br /> APPROVED,f( with Conditions (See Below) <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN (H&S <br /> 25299.37,subd.(c)(3).): <br /> 1) Installation of 2 groundwater monitoring xvells using an air hammer to approximately <br /> 140 feet below surface grade (bsg) to evaluate the contamination in groundwater and <br /> to calculate local groundwater flow direction. <br /> 2) Advance 6 borings using an air hammer to approximately 40 feet bsg to define the <br /> extent of the contamination in the soil. <br /> 3) Samples will be submitted to laboratory- for analyses of diesel and BTE1. <br /> COMMENTS AND CONDITIONS: <br /> 1) EHD recommends relocating one or two of the proposed borings to area northeast <br /> and also southeast of the existing monitoring wells 1\'IW4 and hIW5. Previous soil <br /> sample results indicated presence of contamination in the shallow zone (8 feet and 4 <br /> feet bsg, respectively) at soil borings BH-3 and BH-4. Select sampling location that <br /> would delineate the contamination. <br /> 2) Commence proposed work by June 10, 2004. <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN (H&S 25299.37, <br /> subd.(C)(3).): <br /> None <br /> DATED Anril23 2004 BY <br /> Cc: CRWQCB, Central Valley Region—James L. L. Barton, RG <br />