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t <br /> URS <br /> Ms.Lori Duncan Page 4 <br /> San Joaquin County Environmental Health Department <br /> July 5, 2002 <br /> Soil cuttings and waste water generated during the drilling activities will be placed in labeled <br /> 55-gallon Department of Transportation (DOT)-approved steel drums and stored on site until <br /> disposal. <br /> Groundwater Monitoring Well Development,Sampling,and Surveying <br /> After installation, the groundwater monitoring wells will be developed by rigorously surging over the <br /> length of the screen interval and by purging a minimum of 10 casing volumes of water. The wells will <br /> be surveyed to mean sea level by a licensed surveyor. <br /> Groundwater samples will be collected from the newly installed groundwater monitoring wells no <br /> sooner than 48 hours after well development. Groundwater samples will be analyzed for TPHg by EPA <br /> Method 8015/8020 and BTEX, MTBE, TAME, DIPE, ETBE, TBA, EDB, and 1,2-DCA by EPA <br /> Method 8260B. Attachment H presents detailed groundwater sampling and analysis procedures. <br /> Report Preparation <br /> Following receipt of the analytical results, a report will be prepared summarizing the results of the <br /> investigation. Included in the report will be the well drilling and construction procedures, monitoring <br /> well construction specifications, and tabulated soil and groundwater data. <br /> If you have any questions or comments regarding this letter, please call Vernon Elarth at <br /> (916)679-2299. <br /> Sincerely, c'��Rp�UCEp�pC <br /> URS Corporation Americas �����oN ��;A <br /> � s <br /> o. 7120 <br /> Exp. 3 <br /> � Scott LookingbilI Vernon Elarth,RG. <br /> Staff Geologist Project Manager �9�OF CAl-�F��� <br /> Attachments: Attachment I Figure Showing Proposed Boring Locations <br /> Attachment H Groundwater Sampling and Analysis Procedures <br /> cc: Mr. Paul Supple,ARCO Products Company <br /> Mr. Marty Hartzell,List,RWQCB, Central Valley Region <br /> x:,osasrnwo as <br />