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I PM <br /> K <br /> Harding Lawson Assoclates <br /> 4. off-Site Wells <br /> i <br /> Information from the State Department of Health <br /> Resources and the City of Tracy Utilities Department indicates <br /> I _ <br /> that five water wells are within 1/4 mile of the site (Plate `) . <br /> ' One of these, a domestic well belonging to the City, extends <br /> r; <br /> deeper than 1000 feet. The remaining four wells are deeper than <br /> I: 150 feet and are apparently used only for irrigation. Informa- <br /> tion about the total depth and formations screened was not avail- <br /> able. } <br /> B. Preliminar In�resti ations <br /> HLA conducted a series of preliminary investigations over an <br /> tps <br /> 18-month period. Abased approach pproach was used to increase the <br /> > ' detail of investigation. The scope of work for each base was <br /> P. <br /> determined by the results of the earlier investigation" and <br /> g Previous ha' <br /> - � regulatory comments re.ceived �durin the } <br /> fe. <br /> Eight borings and seven exploratory probes were drilled <br /> I Irduring these investigations using 6-inch hollow-stem augers. A11 I <br /> i <br /> drilling was conducted under the direction of an HLA field geolo- <br /> i <br /> gist or engineer. All drill cuttings were collected in 55 rf'Mon <br /> drums for storage until disposal.. _-_At -the_completion- of-drillin <br /> and sampling, all� exploratoryf� Probes with the exception of P-3 _ <br /> were grouted full depth. P-3 and the remaining borings were <br /> converted .to monitoring wells. . <br /> - <br /> Soil samples were collected from each boring using a 2-1/2 <br /> fw4 <br /> inch inside diameter (ID) , California modified split-barrel <br /> rrel � <br /> { sampler lined with 6-inch-long brass tubes. All soil samples <br /> i , <br /> C - - <br /> 4 <br /> ` r. <br /> _ h <br /> �✓ l� - - <br />