Laserfiche WebLink
Groundwater Sampling an�Analysis Plan U <br /> Former Texaco Service Station <br /> Chevron Site ID 309075 <br /> :� January 14, 2011 <br /> 4.0 MONITORING AND SAMPLING STANDARD PROCEDURES <br /> The following sections describe procedures for the measurement and collection of groundwater <br /> samples for chemical analysis. Samples will be collected as described in Gettler-Ryan, Inc's <br /> (G-R) [Chevron's monitoring and sampling contractor]) standard operating procedures (SOP). <br /> 4.1 DEPTH TO GROUNDWATER MEASUREMENTS <br /> Prior to purging and groundwater sampling, the depth to groundwater at all the monitoring wells <br /> will be measured. Measurements to groundwater in all the monitoring wells will be collected <br /> using an electric water level sounder. Appropriate decontamination procedures will be used <br /> during the collection of depth to groundwater measurements. The depth to groundwater <br /> measurements will be collected in accordance with the G-R groundwater monitoring and <br /> sampling SOP provided in Attachment B. <br /> 4.2 GROUNDWATER SAMPLE COLLECTION METHODOLOGY <br /> Groundwater samples will be collected in accordance with California Environmental Protection <br /> Agency (CaIEPA) procedures outlined in Representative Sampling of Groundwater for <br /> Hazardous Substances' and in accordance with the G-R groundwater monitoring and sampling <br /> SOP. Field parameters will be monitored prior to sampling using a multi-parameter meter <br /> equipped with appropriate electrodes/sensors. Prior to use, field instruments will be calibrated in <br /> w <br /> accordance with the manufacturer's recommendations. The pH, specific conductance, <br /> temperature, DO and ORP will be monitored during groundwater sample collection. A stack <br /> pump or disposable bailer will be used for purging. Samples will be collected with disposable <br /> bailers. <br /> 4.3 GROUNDWATER SAMPLE CONTAINERIZATION/HANDLING <br /> Sample containers will be provided by the contract laboratory and will be pre-cleaned and <br /> treated according to USEPA specifications for the specified test methods. Containers will be <br /> stored in dry, clean areas to prevent exposure to fuels, solvents, and other contaminants. <br /> Sample containers, preservation methods, holding times, chemical parameters and test <br /> methods for groundwater samples to be followed are presented in Table 4. <br /> w <br /> ' California Environmental Protection Agency Department of Toxic Substances Control.2008. <br /> Representative Sampling of Groundwater for Hazardous Substances(July 1995, revised February 2008). <br /> California: February 2008. <br /> w <br /> \\CA5FP\Data\Aproject\ENV\CHEVRON\309075\6 Deliverables\Work Plan\SAP\309075_SAP_6671110950.doc 5 <br />