Laserfiche WebLink
t <br /> 21 March 2006 <br /> AGE-NC Project No 97-0290 <br />' Page 10 of 15 <br />' 7.0. PROCEDURES <br /> Field procedures for ground water monitoring and sampling and soil-vapor extraction monitoring <br />' are described below All field work was performed in accordance with CVRWQCB guidelines for <br /> the investigation of UST sites Ground water sampling was conducted in accordance with guidelines <br /> for monitoring well sampling issued by the EHD <br />' Field procedures for the collection of soil samples are detailed in Soil Vapor Extraction and In-Situ <br /> Air-Sparging Confirmation Soil Sampling Work Plan, dated 28 September 2005 and approved by <br />' the EHD by letter in October 2005 <br /> 71 WELL MONITORING AND EVACUATION <br /> On 20 January 2006, a Solinst water level meter was used to measure the depth to ground water in <br /> I monitoring wells relative to the tops of the well casings (Table 3) After recording the water level <br /> measurements, a dedicated disposable bailer was used to purge monitoring wells MW-2 through <br /> MW-6 and well MW-8 of standing water, approximately 4 5 to 5 5 gallons of water(a minimum of <br /> three casing-water volumes per well)were removed from the wells Ground water parameters during <br /> the purges were not collected Field sheets and data are included in Appendix B Purged water was <br /> Istored in a properly labeled, 55-gallon drum pending disposal <br /> 7 2 COLLECTION OF GROUND WATER SAMPLES <br /> Ground water samples were collected from monitoring wells MW-2 through MW-6 and well MW-8 <br /> using the dedicated disposable plastic bailers after allowing the wells to achieve a minimum 80% <br /> recovery of the pre-purge water volume Each water sample was transferred into 40-m1 volatile <br /> organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid solution as a sample <br /> preservative The samples were properly labeled,placed in a chilled container,and transported under <br /> chain of custody to Cal Tech Environmental Laboratories(CTEL),a California Department of Health <br /> Service (DHS)-certified laboratory in Paramount, California The samples were analyzed for <br /> ITPH-g in accordance with EPA Method 8015 Modified, and <br /> BTEX and MTBE in accordance with EPA Method 8260B <br /> I <br /> Advanced GeoEn"ronmenta1,Inc <br />