WORK PLANS - Laserfiche WebLink

Home Browse Search

i 23 January 2015 AGE Project No . 06- 1457 Page 4 of 6 3 .0 , FIELD PROCEDURES All field procedures will be overseen by an AGE representative under the supervision of a California Professional Geologist. Procedures for the advancement of the soil borings , groundwater sampling , equipment decontamination and sample shipment are outlined below. 3 . 1 . SOIL BORING ADVACMENT AND SOIL SAMPLE COLLECTION Utilizing a truck- or track-mounted , hollow-stem drill rig , equipped with 8 . 25-inch diameter hollow-stem augers , three pilot soil borings will be advanced to depths of approximately 80 feet bsg . Proposed boring locations are illustrated on Figure 3 . i I 3 . 1 . 1 . Soil Sampling Beginning at 5 feet bsg , relatively undisturbed soil samples will be collected from each u� of the soil boring , locations at 5-foot intervals using a California modified split-spoon sampler fitted with 2- inch diameter, 6-inch long brass sleeves . Upon removal from the ¢ ` I I, ,. sampler, the sample sleeves will be separated with a knife . The exposed ends of the �C second sleeve will be covered with Teflon sheets , capped , and sealed with tape . Soils n4 sampled 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 meter (OVM) , equipped with a photo-ionization detector ( PID) . Soil sample descriptions and OVM readings will be recorded on a log for each boring . Following sample collection , each preserved sample sleeve will be labeled with the boring location , depth , time , date , and sampler's initials . Appropriately sealed and labeled samples will be placed in a chilled container and transported under chain of custody to DP certified laboratory for analysis for the constituents listed in Section 2 . 2 . No 3 . 1 . 2 . Grab Groundwater Sampling Once the three borings have reached approximately 50 feet bsg and again at the total depth of 80 feet bsg is reached , a Geoprobe (or similar) push-driven water sampling device will be advanced or driven four feet and then retracted to expose temporary well screen . Groundwater samples will be extracted from the tool by dedicated disposable or polyethylene tubing through the hollow center of the push rods into the screen section . Samples will be analyzed for the constituents listed in Section 2 . 2 . and will be collected into laboratory-supplied , non-preserved 40-ml Volatile Organic Analysis (VOA) vials . Advanced GenEnvironmcntal Inc.