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(x <br />i= f <br />Ms. Mary L. Boyd Page 3 <br />CVRWQCB <br />August 18, 2006 Clayton Project No. 25003-003242.00 <br />monitored. Purge water will be collected and appropriately managed for disposal <br />based on the analytical results of the groundwater sample from the corresponding <br />well. <br />5. Well Survey. <br />The well survey will include measurements of the top of casing, horizontal and <br />vertical coordinates for the well location. The vertical accuracy will be at least ± <br />0.01 foot. <br />6. Well Sampling. <br />As previously mentioned, sampling activities will not commence until 48 hours after <br />the well has been developed. After purging is considered complete the well will be <br />allowed to recover to a minimum of 80% of the original water level and a sample <br />will be collected using a new disposable bailer. In addition to the analytes listed in <br />the Workplan, all groundwater samples will be analyzed for the following in <br />accordance with the CAO for the site: <br />• Carbonate Alkalinity and Bicarbonate Alkalinity in accordance with USEPA <br />Method 310.1 <br />• Total Petroleum Hydrocarbons for Gas and Diesel ranges in accordance with <br />USEPA Method 8015M <br />• Volatile Organic Compounds in accordance with USEPA Method 8260B full <br />suite <br />• Semi -Volatile Organic Compounds (including Polyaromatic Organic <br />Compounds) in accordance with USEPA Method 8270C <br />• Polychlorinated Biphenyls in accordance with USEPA Method 8082 <br />All samples will be individually labeled, recorded onto the chain of custody form, <br />and stored on ice pending transport to a California -certified laboratory. A summary <br />table describing laboratory sampling information (e.g. preservation agents, sample <br />containers, etc.) is provided in Appendix C. <br />S: ES Prgj P03242 Groundwater G\N_Investigation_Addendum_FINAL.doc <br />