ARCHIVED REPORTS_XR0012577 - Laserfiche WebLink

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Y MEMO ffffMA December 11, 1991 Beacon Service Station No, 492, Manteca, California Soil samples collected for possible chemical analysis will be Pro sealed with Teflon tape and plastic caps. They will then be labeled and placed in iced storage for transport to in of Custody Record will be initiated by the field geologist the analytical laboratory. A Cha and will accompany the soil samples to the laboratory. Samples not selected for chemical analysis and the soil in the sampler oe re extrudedude i s the field and examined using visual and manual methods. Logs of Borings incof texture,color, moisture,plasticity, consistency,blow counts,and any other characteristics noted along with evidence for the presence of hydrocarbons such as soil staineflob ilabe product odor, and PID readings. After terminating the boring, a monitoring installed. Ground-Water PvfonitoringWell Construction We will observe the drilling of the soil boring to approximately 10 feet below ground water or to the first clay laver and convert the boring to a 4-inch-diameter ground-water WA.'. The well will be constructed of thread-jointed, 4-inch-diameter, monitoring well (M casing, No chemical cements, glues, or solvents will schedule 40 polyvinyl chloride (PVC) g• be used in well construction. Caps will be placed on both the top and bottom of ea cow est ll to prevent intrusion of unwanted materials. The screened portion of the wells will of factory-perforated casing with 0.020-inch-wide slots. The well screen w l extend from the total depth of the well to approximately 3 feet above the upper Zone n. The annular space opposite the screen will be packed with No. 3 sorted sand to a point a roximately 2 feet above the slotted interval. A 2-foot-thick bentonite plug will be nplaced PPof above the sand pack:. The remaining annulus will be backfilled with a s urry cement, and water to a few inches belov, grade. 8 86102-7'