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June 28., 1991 Harding Lawson Associates <br /> 20548,001.03 <br /> Ms. Margaret Lagorio <br /> San Joaquin County <br /> Page 2 <br /> the 45 foot sampling internal and directly above the <br /> groundwater table for chemical analysis. <br /> I <br /> - Soil samples collected by the Harding Lawson <br /> i Associates (HLA) geologist will be relinquished to a <br /> f laboratory representative under chain-of-custody <br /> procedures. The original copy of -the chain-of-custody <br /> will remain with the HLA geologist and a copy, <br /> documenting the laboratories custody, will be returned <br /> to HLA with the chemical results. f <br /> - In addition to steam cleaning augers between borings, <br /> the Sprague and Henwood (S&H) soil sampler will be <br /> washed with an Alconox and water solution followed by <br /> a deionized water rinse. A PVC bailer will be used <br /> for well development while a stainless steel bailer <br /> i will be used for groundwater sampling. Both bailers <br /> will be washed and rinsed prior to purging and <br /> sampling in the same manner as the soil sampler. <br /> We trust this provides the information requested at this time. <br /> Yours very .truly, <br /> HARDING LAWSON ASSOCIATES <br /> Herb W. Steffe oQ?,OFESSIpN <br /> Staff Geologist �� ��� J•0SB q�F <br /> I <br /> Ca Na 656 r <br /> Ui <br /> € P.3/31/95 T <br /> ASteppn J. Osborne `Plq CFOT <br /> Geotechnical Engineer <br /> F <br /> OF CAt�F� <br /> HWS/SJO/pkp 031726B/L31 <br /> Attachment: Typical Well Construction Detail <br /> cc: Ms. Carmelita Cozad <br /> 4907 East Waterloo Road <br /> Stockton, California 95205 <br /> j <br />