WORK PLANS - Laserfiche WebLink

Home Browse Search

30 August 2005 AGE-NC Project No. 05-1329 Page 5 of 6 4.2. SOIL SAMPLING COLLECTION AND ANALYSIS Soil borings will be sampled at discreet five-foot intervals using a 1.125" Geoprobe soil sampling assembly loaded with four six-inch brass sleeves. Upon sample retrieval, the ends of the second sleeve will be covered with Teflon sheets, capped and sealed with tape. Appropriately sealed and labeled samples will be placed in a chilled container under ice and transported under chain of custody procedure to a DHS-certified laboratory.Each sample sleeve will be labeled with the boring designation,depth,time,date and sampler's initials. Soils encountered in the borings will be visually classified by an AGE geologist in accordance with the Unified Soil Classification System(USCS).Additionally, soil samples will be field-screened for the presence of volatile organic compounds using an organic vapor using an organic vapor meter(OVM)equipped with a photo-ionization detector (PID: Thermo Environmental 580b; 10.0 eV; calibrated to isobutylene). 4.3. IN-SITU GROUND WATER SAMPLING PROCEDURES For the collection of grab ground water samples, soil borings will be advanced to the top of the ground water table as identified by collection of a saturated soil sample.Once ground water has been encountered,a Geoprobe push-driven water sampling device will be advanced two to three feet into the water-bearing zone. The grab ground water samples will be collected using a Geoprobe water sampling assembly with apre-cleaned one-inch diameter,0.01-inch slotted PVC screen.Each ground water sample will be extracted by lowering a Teflon hose-bailer through the hollow center of the push rods into the screened section. Grab ground water samples will be collected into laboratory- supplied 40-milliliter(ml)volatile organic analysis (VOA)vials containing 0.5 ml of hydrochloric acid as preservative and one-liter amber glass containers without sample preservative. Care will be taken to ensure that visible air bubbles are not present in the vials after filling and capping. Following sample collection,the samples will be appropriately labeled with the boring designation, time, date and sampler's initials, placed on ice, and transported under chain of custody to a DHS- certified laboratory. 4.4. EQUIPMENT DECONTAMINATION Prior to use,all sampling tools used for sample collection will be thoroughly rinsed with clean water after being washed with a solution of Alconox. All probing rods will be cleaned prior to advancement at each probe boring location. Advanced GcoEnvironmental,Inc.