Laserfiche WebLink
24 June 2405 <br /> 1. AGE-NC Project No 95-0103 <br /> Page 4 of 12 <br /> and stored all data points every 30 seconds The purge was determined to be completed when <br /> ' parameters stabilized, typically after two-gallons of ground water were removed, the field <br /> measurements are Included In Appendix B <br /> At the end of the purge cycle, the disposable tubing with fitted with an In-line 0 45-micron water <br /> filter attached at the end of the tubing and was then utilized to collect ground water samples at a rate <br /> of approximately 300-m1 per minute within 40-m1 EPA-approved VOA vials containing 0 5 ml of <br /> 18% hydrochloric acid as a sample preservative, 1-liter amber containers and 1-liter plastic <br /> containers with out preservative , <br /> ' The samples were properly labeled and transported In a chilled container under chain-of-custody to <br /> CTEL for analysis The ground water samples were analyzed for <br /> ' r <br /> - TPH-g In accordance with EPA Method 8015 Modified, <br /> ' - BTEX and the fuel additives TBA,DIPE,ETBE,TAME and MTBE In accordance with EPA <br /> Method 8260B and <br /> Dissolved oxygen, carbon dioxide, pH, alkalinity, conductivity, hardness, soluble Iron and <br /> 'i• redox potential, nitrate, mtrlte, sulfate, sulfide, manganese, ferrous Iron, soluble Iron, <br /> chloride, phosphate, calcium, sodium and potassium and total organic content (TOC) and <br /> chemical oxidation demand (COD) in accordance with EPA Methods <br /> 2 3 2 Well Monitoring, Purging and Ground Water Sample Collection and Analysis <br /> In order to evaluate the dissolved hydrocarbon concentrations In selected monitoring wells as a <br /> ' comparison to the low-flow ground water sampling, seven wells were re-sampled utilizing prior <br /> sampling techniques On 11 May 2005, disposable polyethylene bailers were utilized to purge <br /> ' approximately 16 gallon from well VE-6, 12 gallons from well MW-3 and 10 gallons from well <br /> MW-4 Temperature,pH and conductivity were measured for stabilization at regular purge-volume <br /> Intervals from each well using; an Oakton water analyzer, the field measurements are Included In <br /> ' Appendix B Additionally the ground water extraction wells were purged and then sampled as <br /> reported prior, utilizing the dedicated grundfos pumps and purge parameters were not collected <br /> purged water was subsequently treated through the on-site ground water treatment system <br /> ' Water samples were retrieved from each manually purged well using the dedicated disposable bailers <br /> after allowing the well to achieve a minimum of 80 percent recharge prior to sample collection The <br /> ' Samples were transferred Into 40-m1 EPA-approved VOA vials containing 0 5 m1 of 18% <br /> hydrochloric acid as a sample preservative <br /> l� <br /> Advanced GeoEnhronmental,Inc <br /> t <br />