WORK PLANS FILE 2 - Laserfiche WebLink

Home Browse Search

' outogleat racknlcs lac. . • Page 4 Work Plan George's Service ' Project No.425.2 September 26,2007 ' The top of casing measuring point for the new wells will be surveyed as required under AB- 2886. 2.2 Groundwater Monitoring These two sentinel wells will be incorporated into the existing monitoring schedule. The following is a procedure for the sampling of groundwater from the wells: Before sampling is attempted each well will be sounded for depth to water and then a clear disposable bailer will be used to determine if floating product is present. The well will be purged of at least 3 well volumes of stagnant water using either a submersible pump or a Waterra purging system. Purging will continue until the temperature, conductivity, and pH of the groundwater has stabilized (<10% variation between three readings) indicating that formation water representative of aquifer conditions is entering the well. These water quality parameters are measured at intervals of each well volume purged. ' A stainless steel or disposable plastic bailer will be used to collect each sample. Care will be taken to minimize sample agitation from the initial filling of the bailer to the transfer of the ' sample to the VOA vial. Once the sample container is filled and capped, the bottle will be inverted, tapped, and checked for headspace bubbles. The sample container is identified and labeled with a unique designation, inserted into foam holders and placed in a chilled ice chest ' for transport to the laboratory. All non-disposable sampling equipment is decontaminated using a steam cleaner and/or an ' Alconox solution before and between uses. Disposable gloves will be used by the technician to collect all samples and will be changed with each sampling event. ' A chain of custody document, listing all samples collected, accompanies the samples from field to laboratory, thereby providing a means to track their movement and insure their ' integrity. All water purged from each monitoring well and not used as a sample, will be placed in a 55 gallon DOT approved container, properly labeled and stored on site. Groundwater Sample Analyses ' Groundwater samples from each monitoring well will be submitted to a state certified laboratory for the following analysis: • BTEX by EPA method 8020 ' • MTBE by EPA method 8020 • TPH-G by EPA method 8015(m) 1