SITE INFORMATION AND CORRESPONDENCE

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FT i C FAX NO. 9254024720 Apr. 04 2001 12:3ePM P2 PROTOCOLS FOR WELL DRILLING,COMPLETION, DEVELOPMENT, AND SAMPLING: DRILLING r to drillinll all boreholes will be cleared of underground utilities to a depth of at least 4 feet ritical cones" and to S feet hgs in "critical zones". Critical below ground surface (bbs) in "non-c zones are defined as locations that are within 10 feet fTcsnr the furthest edge of any u.txierground storage tank (UST),within 10 :feet of the product dispenser islands, and the entire area between the UST field and the product dispenser islands, iro.nly borings are being installed, an K- to '12-inch- diameter circle will be cut in the surface cover at each boring location. 1f wells are being installed, a 10-inch circle to a 24-inch circle or a 2-foot by 2-1oot square will lie cut in the sur('ace cover at each well location. A hole, greater than the diameter of the drilling tool being used, will then be cleared at each boring location, using a. hand auger or vacuum excavation system. '.Idle vacuum system consists of a water lance, used to disturb taative soil by injecting water into the soil, and used to remove the soil. Boreholes are drilled with a truck-mounted rotary drill, using hollow-stem continuous-flight augers. The.diameter of the augers is selected to provide an annular space between the boring wall and the well easing of no lobs than 2 inclic& All augers ►r4 pressure-washed or steam-cleaned before drilling begins and before each new borehole is drilled. All drill cuttings are either placed on and covered with plastic sheeting or contained in scalod 55-gallon drums. All fluids generated during cleaning of drilling equipment are contained in sealed 55-gallon dreams. All waste generated during drilling activities is stored onsite until appropriate disposal is arranged, The drums are lahelcd with the site description (including owner's name:) and date. The drill cuttings are-disposed of'at aproper ("acility based on results of soil sample analysis. During drilling, an rTIC geologist generates a soil boring log for each borehole. The boring logs contain detailed geological information, including descriptions of the soils classified according to the Unified Soil Classification System (IJSCS), blow counts for soil sampling intervals, organic vapor analyzer (OVA) readings, relative moisture content of'the soils, and initial and static water levels. SOIL SAMPLING: Soil samples are collected using a. 2-inch-diameter by 18- or 24-inch-long modified California split-spoon sampler containing three or (bur 0-inch-long brass or stainless steel liners. The sampler and liners are scrubbed in potable water and Alconox or equivalent detergent and rinsed with potable: water after ase at ouch sa.alipling interval. At each sample depth, the sampler is driven 18 or 24 inches ahead of tile. augers into undisturbed soil. Wilen the sampler is retriuved, either the lowornrost or the middle sample liner is removed and the ends Of tile tube are covered with aluminum fail or Teflon tape and scaled with plastic caps. The soil-filled liner is labeled with the horcholc nuinber, stunplc depth, site location, date, and time. The samples are placed in zip-lock bats and stored in a cooler containing ice. F'iHAlt]iUUf,iiopy��qgoux.I:;U>rilI lig Pmdmnle —f 1 1.1 111 dw 1