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STANDARD OPERATING PROCEDURE- ' <br /> GROUNDWATER SAMPLING , <br /> Gettler-Ryan Inc. (GR) field personnel adhere to the following procedures for the collection and handling of ' <br /> groundwater samples prior to analysis by the analytical laboratory. All work is performed in accordance with the <br /> GR Health&Safety Plan and all client-specific programs. The scope of work and type of analysis to be performed <br /> is determined prior to commencing field work. , <br /> Prior to sampling, the presence or absence of free-phase hydrocarbons is determined using an interface probe. <br /> Product thickness, if present, is measured to the nearest 0.01 foot and is noted in the field notes. In addition, all ' <br /> depth to water level measurements are collected with a static water level indicator and are also recorded in the field <br /> notes,prior to purging and sampling any wells. <br /> After water levels are collected and prior to sampling,if purging is to occur,each well is purged a minimum of three ' <br /> well casing volumes of water using pre-cleaned pumps (stack, peristaltic or Grundfos), or disposable bailers. <br /> Temperature,pH and electrical conductivity are measured a minimum of three times during the purging(additional ' <br /> parameters such as dissolved oxygen,oxidation reduction potential,turbidity may also be measured,depending on <br /> specific scope of work.). Purging continues until these parameters stabilize. <br /> Groundwater samples are collected using disposable bailers. The water samples are transferred from the bailer into ' <br /> appropriate containers. Pre-preserved containers,supplied by analytical laboratories,are used. When pre-preserved <br /> containers are not available,the laboratory is instructed to preserve the sample as appropriate. Duplicate samples , <br /> are collected for the laboratory to use in maintaining quality assurance/quality control standards,as directed by the <br /> scope of work. The samples are labeled to include the job number,sample identification,collection date and time, <br /> analysis, preservation (if any), and the sample collector's initials. The water samples are placed in a cooler, , <br /> maintained at VC for transport to the laboratory. Once collected in the field,all samples are maintained under chain <br /> of custody until delivered to the laboratory. <br /> The chain of custody document includes the job number,type of preservation, if any,analysis requested, sample <br /> identification,date and time collected,and the sample collectors name. The chain of custody is signed and dated <br /> (including time of transfer) by each person who receives or surrenders the samples, beginning with the field <br /> personnel and ending with the laboratory personnel. , <br /> A laboratory supplied trip blank accompanies each sampling set. The trip blank is analyzed for some or all of the <br /> same compounds as the groundwater samples. , <br /> As requested by Chevron Environmental Management Company, the purge water and decontamination water <br /> generated during sampling activities is transported by IWM to Chemical Waste Management located in Kettleman <br /> Hills, California. <br /> N;\Celifo.w\fo�\ch.-SOP-Sept.2009 ' <br /> 1 <br />