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1 <br /> 1 <br /> for more details. <br />' GEOLOGIC & TOPOGRAPHIC SETTING: <br /> The properties are located in the southern portion of what is <br />' referred to as the Sacramento Valley. Mosher Creek is about 1 <br /> 1/2 miles to the north, and the Calaveras River is approximately <br /> one mile to the south. The area is one of very low relief , <br />' typical of central valley topography; drainage is to the south- <br /> west at approximately 5 ' per mile. The NorMa.c property is used <br /> for the storing and selling of irrigation products; PVC pipe, <br /> fertilizer, etc. The adjacent Hammertown Partners parcel is <br />' vacant, undeveloped land; it is planned to convert the property <br /> to residential use. Plate III shows the properties in relation <br /> to nearby features. <br /> DEPTH TO GROUNDWATER: <br />' Based upon San Joaquin County Flood Control District maps„ the <br /> groundwater was as high as 9- 40 ' bgl when measured in the spring <br /> of 1986; (refer to Plate IV. ) More recent maps and data from <br /> monitoring wells in the area indicate that the water table is <br /> presently at about 65 ' bgl . <br /> LOCATION OF NEARBY WELLS: <br />' Plate V shows the locations of municipal wells in the area; the <br /> nearest groundwater monitoring wells are reported to be at E1 <br /> Dorado & Hammer Lane, about one mile northwest of the site. City <br />' of Stockton well #22, is located near the corner of Tarn O 'Shanter <br /> & Swain Road, on APN 084-050-09; (Plate II. ) The driller 's log, <br /> (Exhibit F, ) shows that it is screened from 335 ' to 405 ' ; with <br />' the first sand recorded from 156 ' to 162' . It is reported that <br /> the well is produced only intermittently; static water level <br /> measurements have not been taken. <br />' BRIEF REVIEW OF PRIOR WORK: <br />' July 12, 1989 - 1 ,000 gal UST removed by Jim Thorpe 011 , Inc. ,(JTO. ) A strong gasoline odor and discolored soil was noted at <br /> the west end of the excavation, in the vicinity of the pump <br /> island. Spoil returned to hole & covered with plastic. <br /> IJanuary 19 thru 22, 1990 - Site was re--entered and additional <br /> spoil was removed. Refer to Exhibit A for details. <br /> Since it was decided that further excavation was not feasible, <br /> the removed spoil was remediated on site by aeration over a <br /> 2 <br /> I <br />