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well staUatia N 5469 <br /> ,kRCO Facility <br /> Stockton,california <br /> Page 2 <br /> kg; tertbutyl alcohol <br /> (TBA) at 44� <br /> benzene at a concenuatiana f Ou 8to 16 mglkg(1T, 2004). <br /> ktlo�rain ( I ether(MTBE) ran,-iia p <br /> mg/kg; and ,ethyl-tent baty acted soil was performed <br /> hydrocarbon imp arils of <br /> limited excavation of by raximate1 4 cubic Yards to <br /> Based on the analytical results, western dispenser island. <br /> viCinit of the north end of the ttiv orthpend of theds. pp l ; feet bgs}, only <br /> in the Y roximate y <br /> impacted soil oras excavated frarn t soils (encountered at aof dispenser island' <br /> subsurface utilities and native h xca- d ea-gravel were excavated and <br /> overlying pea-gravel vwas hand excavated from the north end of the eastern <br /> gout the project, approximately 60 cubic yards of soil a p <br /> Throu& 2000}- <br /> removed from the site (IT,February <br /> l anitorirr� Well Installationwere <br /> Permits were obtained, the proposed o ions <br /> p h dole <br /> well p Were notified of the <br /> Prior to the initiation of field activities, d the PHSIEHD ¢ er and hand auger to reduce <br /> marked, and Underground Service�Alert dvanced with a pasthole di <br /> The initial 5 feet of the no underground utilities. <br /> the possibility of d <br /> Delta representative, under the direction of a California <br /> and $, 2000, a D ps Each of the borings <br /> Between 3uae 5 g of six soil boxing at the locations <br /> rist was on site to oversee the drilling through MW-6 ) sampled <br /> Registercd Geolo,g ` Q wells, was continuously <br /> to groundwater monitoring 2, and MW-, <br /> were converted t The soil at locations MW-1, ' - <br /> vertical <br /> shown <br /> on pigure _. ration. Sail samples were collected at 5 gincr between <br /> to provide detailed stratigraphic info s The initial borings extended to depths ran 0 0-)0-inch <br /> well locations. a /offs and <br /> intervals at the remaining as The ,ells were constructed of 4-inch diameter, <br /> approximately 55 and 61 feet om a depth of approximately 33 33 to �a feet b� . <br /> factory-slotted PVC casing <br /> well construction details are presented in Attachment A• aers. All <br /> Ti equipped with hollow-stern au,� <br /> a truck-mounted drilling le rinsed prior to, and <br /> u. =-r ' solution and trip <br /> Tlie weals were drilled using driving a modified California-type <br /> sampling equipment vas cleaned using Ies�were collected by into <br /> between, each sampling event. The camp b 6-inch stainless-steel Sleeves' The <br /> ler, equipped with three clean �` falling 0 inches (blow count). <br /> split-spoon same 6 a 140-pound slide ham le ends were covered with TeflonT"' <br /> undisturbed soil using The samp le was <br /> lowermost, intact sample was retained far anal placed in � ice-chilled cooler. Each sample <br /> sheets and plastic caps and samples were P farm• <br /> a r©priately labeled and identified on a chain of custody ere field screened for <br /> volatile <br /> pp lin interval w <br /> on detector (prj)). The sail was alsltslblowc aunt,and <br /> Additional sleeves of sail collected <br /> sampling Benin results <br /> organic compounds using a phleld <br /> Soil Classificati©rx oil classi ca °n X <br /> System. Soil <br /> hrnent A. <br /> Unified resented on the baring log <br /> other pertinent data are p <br />