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G, <br /> r >.� ���,�,,,W��sa,.�.y'�:.x.�,t...Y. �'. �.�4 _ � W.,, .,.,..mar.'__:..: �•"'`� i <br /> y <br /> tM <br /> 'n <br /> v <br /> e,w <br /> 4+ti <br /> k' <br /> Chevron/Stockton 10 <br /> November 1989 <br /> a <br /> B, tar TPH-as-waste-ail using APRA SM 503 E/132, and for the <br /> presence at cadmium (Cd) , Chromium \'Cr) , lead (Pb) , and zinc (Zn) <br /> using Methcds 7005/6010. <br /> SGIL BORING AND WELL INSTALIATION <br /> Three soil borings will be drilled on site in the <br /> approximate location shown on Figure 3. Actual placement of the <br /> soil borings will be determined by the areal extent and configur- <br /> ation of the excavation pits. ;borings will be drilled in accord- <br /> ance with attached SOP 13, with the intention of installing four- <br /> inch-diameter wells. Based on regional groundwater information, <br /> the depth to groundwater is anticipated to be approximately 36 <br /> feet. A= such, GTI expects the wells to be approximately 56-feet <br /> deep. During drilling, if a laterally continuous aquitard layer <br /> ,. s of thickness of at least 5 feet is encountered below 'the first <br /> jencountered water, the boring will not be advanced to a greater <br /> depth. In this case, the hole would "_2 backfilled with 'u4entonite <br /> to a level above the aquitard layer, and the borehole completed <br /> ' . as a groundwater monitoring well. <br /> Wells will be constructed of 4-inch-diameter Schedule 40 <br /> t <br /> polyvinyl chloride (PVC) blank casingand .020-inch slotted <br /> screen. Casing will extend at least 5-feet abr.ve and 20--feet <br /> balow encount,rred groundwater. A filter pack comprised of clean <br /> 1 <br /> No. 2 'Mantorey sand will be emplaced in the annular space of the <br /> _ f-��lehole. The sand packs will extend at least 1-foot above the <br /> tap of the well screen, and a bentonite seal comprised of a layer <br /> of hydrated bentonite pellets at least 1-foot-thick will be set <br /> above the sand pack. A surface seal of neat cement grout will be <br /> f emplaced above the bentonite. Finally, the wellhead will be <br /> yy encased in a locking steel monument casing to protect the <br /> wellhead. <br /> ��, C.HUS\1�1CtTEH <br /> i <br /> s <br /> f <br /> p <br />