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brief program for remediation of the removed <br /> included. <br /> spoil was also <br /> After considerable <br /> Divsion correspondence with the Environmental <br /> , the firm retained the <br /> Associates the <br /> of William J. Health <br /> supervise the prepare the necessaryHunter <br /> re-excavation and samlineports and workplan <br /> and Workplan, dated March g- A Preliminary * and <br /> is attached to this re 29, 1991 , was submitted to Report <br /> the reexcavations Port as an Appendix. the County, <br /> workplan. & sample locations �'Zates IAC & X show <br /> as proposed in that <br /> DETAILS OF WORK PERFORMED SUBSEQUENT <br /> WORKPLAN: Work commenced on A TO COUNTY APPROVAL <br /> of William J. Hunter April 18, 1991 OF THE <br /> Count , R. G. , and Mr, under the supervision <br /> Y Environmental Health Division. <br /> Knoll , EHS, from the <br /> Hill removed loose A backhoe <br /> excavation which soil and weeds from operated by B. <br /> area about <br /> which <br /> had contained the the bottom of <br /> 10 " in the gasoline and diesel tanks. the <br /> from recent rains bottom contained sli An <br /> Pproximate, -, , which appeared tq slightly muddy water <br /> A be <br /> Sides y ` feet of soil about 6 <br /> . , and placed on the wasremoved from north deep. <br /> consisted of west side of and east <br /> overlying more loose, brownish the pit. The <br /> Co..., <br /> interbedded <br /> loam top irregularly cobbles, and clay. , Irregularly <br /> Y• No odor or discoloratlaners of sand, gravels, <br /> The backhoe noted. <br /> was then relocated, and began removing <br /> same sandy loam The to material from <br /> Of contamination observed <br /> on the north a 1t consisted of the <br /> noted. and east sides; no evidence <br /> visable discoloration However, a strop <br /> consisted of wars noted below g gasoline odor and <br /> cobbles ranging mix of interbedded that depth. The <br /> clays, sands Iithology <br /> cobbles up to 8 in diameter. ' and gravels, with <br /> were well rounded Most of the <br /> by wind and water , indicative of considerable rreworkiing <br /> coarse action. There were occassional lenses <br /> gravels and cobbles <br /> f very <br /> color ; (caused b which had a distinctive reddish© <br /> orange <br /> the west, and Y iron-oxide staining. ) Excavation continued to <br /> contamination decreased, butorrginal bottom <br /> noticeable removed ©f 16 ' : visable <br /> gasoline but material still <br /> hard, well cemented At a depth of about 20 • had a <br /> same clay sand containing abundant volcanic layer of <br /> y was encountered; it had <br /> moist, drying to a li h a distinctive ash and ' <br /> gasoline g t greenish- mauve color when <br /> odor was evident Aur le <br /> when crushed and , but the material color. A strong <br /> into the pit from Placed in water-. The backhoe Operator exhibit color <br /> from the the west end, and removed severaalpfeetar ramped <br /> south wall ; no odor or <br /> Contamipatian appeared discoloration of spoil <br /> and west side of to be restricted was noted. <br /> the excavation Primarily to the bottom <br /> but due to the to <br /> of the <br /> 4 <br />