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20 ber 1998 <br /> Decem <br /> AGE-NC ProjecfNo. 97-0312 <br /> :Page 5 of T: <br /> 30 inches. The number of blows required to.advance the sampler .in'6-inch increments.will be. <br /> . + recorded on the boring log. Upon removal from sampler,the ends of the lead sample sleeve will <br /> be covered with Teflon sheets,capped'and.sealed with tape.'Each.preserved sample sleeve will.be:._` <br /> i' . . labeled with the boring location;-depth,time;-date and'sampler's_initials: Ap.propriately''sealed and <br /> labeled samples.will be placed on ice in a'chilledcontainer,-and transported under.ch&ini=of-custody <br /> - procedure to S.DHS-certified laboratory. x <br /> s. Soils encountered in the borings will be visuallyclassified by an AGE,geologist in accordance with <br /> the Unified Soil Classification:System (USCS). Additionally,:soil-samples with be field screened <br />' for the.presence of volatile.-organic compounds using an organic vapor meter equipped with a photo- . <br /> ionization detector(PID)precalibrated t61sobutylene.. 71, _ <br /> a • F <br /> .4.3. - , GROUND WATER SAMPLING PROCEDURES` <br /> For the collection of"grab".;ground water samples,selected borings will'be-advanced approximately <br /> five`feet into the ground wateraable as identified by collection of a saturated soil sample.,Grou'd' <br /> water will be allowed to enter the'augers. Each groundwater sample will be-:extraeW by s <br /> Iowering <br /> ­ - - ` - k <br /> a disposable bailer through..the-hollow stem augers into ground:water.;'Samples.will be collected, <br /> preserved and transported as ydescribed in-Sectioii"4.7.2 <br /> 27 <br /> 4.4. SOIL BORING ABANDONMENT ` <br /> All borings will be permanently to prevent vertical migration of contaminants. Soil borings <br /> will be.abandoned by backfilling with portland cement from thee-total depth to surface-grade. A- <br /> ' tremmie pipe will be used for,'ljackfllling.borinis greater than 2'5 feefin depth or where ground-water <br /> is present in the boring <br /> 4;5. MONITORING'WELL COMPLETION <br /> ' <br /> Following com letion of drillin� a pilot,borin n' _ <br /> g p g p , g'-north-of the.former-UST cluster area, a 2 inch <br /> ` diameter,Schedule 40 PVC 0.020-inch. slotted well screen acid casing will be installed..A'20-foot <br /> section of well screen will be installed-, ektending approximately l5-feet=below and five-feet above <br /> s the to 'of the round 'water table: The filter ack,material coni tin - <br /> P- _ g p . s s g.,of pre-washed #3 Lonestar.. F <br /> ` sand, will then be added extending from the bottom of the borehole to approximately-.wo'feet above <br /> the -screened interval. Following placement;of the filter pack; the well will be surged to-assist in ,"'w <br /> settling the filter-pack.-Additional'sand will be added if settling occurs.-'. = : ; <br /> t ., AdvnxcedGeoEnvironmenlal.InC. <br /> ' <br />