ARCHIVED REPORTS_XR0012578 - Laserfiche WebLink

Home Browse Search

ROYAL OAK SAVINGS& LOAN Fatended Ground Wager Investigation °,zge 4 3.3 Well Development & Samplutg The well will be developed until the well water appears clear of sediment and the appropriate number of well volumes (based upon the judgement of the responsible professional) have been evacuated. Tile water produced during well development will be containerized and left on site in 55-gallon drums or other suitable containers for disposal as hazardous waste, if deemed necessary upon receipt of laboratory results. Disposal will be the responsibility of the client unless other arrangements have been made. All soil and ground water samples will be properly labeled with date collected, project number, sample coordinator, and sample identification. All samples will be identified with job number, year, borehole and depth/monitoring well-hour. Field records will document the above information and other significant data such as names of on-site personnel, sampling methods, date and time of sam- pling, the number of well volumes removed before sampling„ preservatives added (if any), and any filtration performed on samples. The samples will be refrigerated immediately for delivery to the laboratory and will, under no circumstances, be opened by anyone other than laboratory personnel. Chain of Custody records will be maintained at all times (Figure 5). 3.4 Soil Sampling All sc-;l sampling equipment will be thoroughly steam cleaned 1}efore. and be- tween sampling to prevent cross contamination. Relatively undisturbed soil samples will be taken at intervals of not more than five feet (5') in order to evaluate the subsurface materials; however, this sampling interval may be waived in saturated sands in which sample recovery is not possible. The soil samples will be taken using a California Modified Split Spoon sampler with brass liners. The sampler will be driven by a 140 pound hammer repeatedly falling 30 inches. The blow counts necessary to drive the sampler will be recorded for each six inch (5") interval to help evaluate the consistencies of the materials. The laboratory samples will not have head space and will be immediately sealed in their liners using aluminum foil lined plastic caps that are taped in place. The remaining sample will be removed from its liner to be used as an aide to the on- site geologist in logging the material at that depth.