FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

- } CJeobgica[Technics Inc. 1+./ %-.10 Page 4 Soil Groundwater Investigation Report Moresco Project No.251.3 June 7, 1999 Once the sample container was filled and capped, the bottle was then inverted, tapped, and checked for headspace bubbles. The sample container was then identified and labeled with a unique designation, inserted into foam holders and placed in an ice chest cooled to 4°C for transport to the laboratory. w.. All non-disposable sampling equipment was decontaminated using a steam cleaner before and between uses. The following duality control measures were used: • Disposable gloves were used by the technician to collect all samples and were changed with each sampling event. • A bailer blank for the well was collected prior to sampling by filling the decontaminated stainless steel bailer with water (provided by the laboratory) and then W filling a VOA vial (provided by the laboratory) using the same procedures for actual sample collection. Bailer blanks for each sample, along with a field blank (prepared from water provided by the laboratory poured into a VOA vial on site), accompanied the samples to the laboratory and serve as checks against cross contamination. A chain of custody document, listing all samples collected, accompanied the samples from field to laboratory, thereby providing a means to track their movement and insure their integrity. The monitoring well purge water was containerized in DOT approved 55-gallon drums, properly labeled and stored on site. 2.2.2 Groundwater Sample Analyses Two sets groundwater sample (April 8 & May 19, 1999) were submitted to Kiff Analytical of Davis, CA (State Certified Laboratory #2236)for the following analysis: +� • benzene, Toluene, ethylbenzene and xylene (BTEX by EPA method 8260B), 0 gasoline range petroleum hydrocarbons (TPH-Gasoline by EPA method 8260B) • oxygenated fuel compounds (MTBE, D1PE, ETBE, TAME, TBA) by EPA method ,o 8260B) The detection limits for these compounds are listed below. A Chain of Custody was completed for all samples collected and tracked to ensure sample integrity. etectionLimits: Water µ 0.5 J 3.0 RESULTS OF INVESTIGATION The analytical results and field observations are discussed below. Summary analytical data is included in Appendix A, the boring log is included in Appendix B. A sit map with soil boring and monitoring well locations is included as Figure 2. 4 4 kr