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JUN 28 '91 IA: 415 6C �67? HLG iv:11'J!=:[�F:L I <br /> -� II1 J P,c <br /> June 28, 1991 11sr4ing Dawson Assotist" <br /> 20548, 001.03 <br /> Ms. Margaret Lagorio <br /> San Joaquin County i <br /> Page 2 <br /> i <br /> the 45 foot sampling internal andidirectly above the <br /> groundwater table for chemical analysis. <br /> Sail samples collected by the Harding Lawson <br /> Associates (HLA) geologist will be relinquished to a <br /> laboratory representative and r 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 laboratoriescustody, will be returned <br /> to HLA with the che=mical results. <br /> - In addition to steam cleaning aug rs between borings, <br /> the Sprague and Henwood (S&H) soil sampler will be <br /> washed with an Al.conox and wa er rolution followed by <br /> a deionized water rinse. A 7C bailer will be used <br /> for well development while a stainless steel bailer <br /> will be used for groundwater 6ampl:ing. Both bailers <br /> will be washed and rinsed pri'pr 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, i <br /> HARDING LAWSON ASSOCIATES <br /> i <br /> Herb W. Steffe <br /> Staff Geologist <br /> i <br /> I <br /> Step n J. Osborne <br /> Geotechnical Engineer <br /> HWS/SJc/pkp 031726B/L31 <br /> Attachment: Typical, Well Construction Detail <br /> cc: Ms. Carmelite Cozad <br /> 4907 East Waterloo Road <br /> Stockton, California 95205 <br /> Il it <br />