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d <br /> 1111 - <br /> April 29, 1988 <br /> PW 88-4924.03 Harding Lawson Alwaaolmfes <br /> Mr. Hal Millar <br /> Th@ Southland Corporation <br /> Page 7 <br /> Preliminary information indicates that the depth to a se <br /> Permeable layer is less than 80 feet below the Gond <br /> face. In accordance with the requirements of theo� sur- <br /> establish the vertical extent of contamination, we will <br /> drill and sample a boring at 5-foot intervals WQCB to <br /> encountered.' This This80 eborin to a depth sof <br /> et or until a second permeable layer is <br /> using a rotary wash drilling technique.ch drilled adjacent to ;BIW-1, <br /> resulting data to locate the secand�erwe will anal <br /> ywe the <br /> screened interval for the dee permeable layer and the <br /> i pleted in the same boring. p monitoring well to be com <br /> After advancing the borehole through the first sand stratum, <br /> the .borehole will be reamed to a diameter of 12 inches and <br /> f- 12-inch conductor casing will be set in this bori <br /> Will extend at least 10 feet into underl in ng that <br /> permeability. The annulus Cf the casingyWilllheerraute�wer <br /> with a cement-bentonite slurry. g <br /> r <br /> x <br /> After the slurry has hardened, we will begin installingt <br /> deep monitoring well. The driller will use . he <br /> techniques to extend through the cement-bentonite into <br /> second ry wash <br /> Permeable layer. A four-inch PVC casing will betset <br /> in the second sand layer Y with the screened ection (0.02 <br /> in a <br /> inch perforations the sand formatis <br /> n. <br /> ` Development and sam lin I <br /> P g procedures will be performed as de- <br /> ti�. scribed in Appendix B. Alia the existing <br /> F <br /> installed wells will B. <br /> sampled, and recently . <br /> ►` p . in addition to the borings. <br /> The Chemical an3y8es that make u } <br /> the CVRWQCB. A maximum of two soipltsam samples are required by <br /> from each`baring for the fallowing csamples <br /> p will be tested <br /> nts <br /> ¢; <br /> TPH as gasoline <br /> : 8015 <br /> : � Aramatic volatile organics <br /> 8020 <br /> The soils samples selected for testis will <br /> '. the highest organic vapor concentrations as measured b t <br /> r` Gals Tech or photoionization detector. Y the <br /> I - nF <br />