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M <br /> 130 North Hunter Street <br /> Page 2 of 2 <br /> • Direct push borings are proposed. Since a deeper investigation than 30 feet bgs is <br /> needed, the use of hollow stem auger drilling or cone penetration testing should be <br /> considered. Soil samples should be collected at a minimum of every five feet or at <br /> changes in lithology. Continuous core for lithological evaluation is recommended. <br /> Sufficient soil samples should be analyzed to demonstrate definition of contamination. A <br /> groundwater sample from first encountered groundwater should be analyzed as well as <br /> deeper groundwater samples to investigate the extent of vertical contamination in the <br /> groundwater. <br /> • Analyze groundwater samples for total petroleum hydrocarbons (TPH) as kerosene by <br /> Environmental Protection Agency (EPA) SW-846 Method 8015B; and 1 ,2-dichloroethane <br /> (1 ,2-DCA), 1 ,2-dibromoethane (EDB), ethanol, and methanol by EPA SW-846 Method <br /> 8260B, in addition to the proposed analyses for TPH as gasoline by EPA SW-846 Method <br /> 8015B; and benzene, toluene, ethyl benzene, total xylenes (BTEX), methyl tertiary-butyl <br /> ether (MTBE), di-isopropyl ether (DIPE), tertiary-amyl methyl ether (TAME), ethyl <br /> tertiary-butyl ether (ETBE), and tertiary-butyl alcohol (TBA) by EPA SW-846 Method <br /> 8260B . Report 1 ,2-DCA and EDB as low as 0.5 micrograms per liter (µg/.L) in <br /> groundwater, if possible. <br /> • Analyze soil samples for TPH as kerosene by EPA SW-846 Method 8015B, in addition to <br /> the proposed soil analyses for TPH as gasoline by EPA SW-846 Method 8015B, and BTEX <br /> by EPA SW-846 Method 8260B, and total lead analysis by EPA SW-846 Method 6010B <br /> for soil samples collected from the excavated pits. <br /> A well permit application and $89 .00 permit fee have been submitted and will be used for <br /> permitting the on-site borings. Please submit an encroachment permit from the City of Stockton <br /> and a well boring permit application and $89.00 permit fee to EHD for the three borings to be <br /> advanced in the street; notify EHD at least 72 hours prior to commencement of the fieldwork; and <br /> submit a site-specific health and safety plan to EHD prior to initiating the fieldwork. Complete the <br /> fieldwork by December 10, 2004, and submit the report of findings to EHD within eight weeks of <br /> completing the fieldwork. Laboratory analytical results must be electronically submitted to <br /> GeoTracker, the State Water Resources Control Board database program. <br /> Should you have any questions or concerns regarding this letter, please contact Vicki McCartney, <br /> REHS, by mail (address on letter head), by telephone at (209) 468-3456, or by e-mail at <br /> vmccartney@sj cehd.com. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Vicki McCartney, RENS // Margar Lagono, REH Supervisor <br /> LOP/Site Mitigation Unit IV (/ LOP/Site Mitigation Unit IV <br /> c: David Dixon - Treadwell & Rollo <br /> James L.L. Barton - CVRWQCB <br />