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i <br /> I <br /> San Joaquin County Public Health Services.Mme 3.1991,Letter <br /> 420 West Kettieman Lane,Lodi,California <br /> i <br /> 1,000 ppm and BTEX at 1, 50, 50, and 50 ppm:; Since the levels are at or <br /> within the maximum allowable levels and the impacted soil was shallow, <br /> Aegis feels an additional well is unnecessary. In addition, a consistent <br /> groundwater flow direction will be difficult to ascertain due to a gradient <br /> consistently measured at 0.001 ft/ft (a very flat lying.water table). Also, the <br /> ARCO station to the northwest of the site has, a groundwater treatment <br /> system in operation which may effect the Focal gradient. There is currently <br /> a well on the southwest portion of the site from Which groundwater samples <br /> have been consistently BDL. It is Aegis' opinion that -a groundwater flow <br /> 3 <br /> direction to the southeast may not be accurate,;and measurements in the <br /> past are more consistently in a southwest direction, further supporting <br /> Aegis' opinion that additional wells are not required. <br /> i <br /> • The SJCPHS/EHD requested additionai'.I information on stockpiled soil <br /> disposal for soils generated during the drilling of:;borings 131 through B16 in <br /> September 1989, and MW-1 through MW-Sin October 1990. The 1989 soils <br /> were disposed of at Casmalia Resources it Casmalia, California. The 1990 <br /> soils were disposed of at Zanker Landfill in Mountain View, California. <br /> Please refer to Attachment 3 for documentation. <br /> Please call me at (916) 782-2110 if you have any questions or comments. Thank you. <br /> Sincerely, <br /> AEGIS ENVIRONMENTAL, INC. ' <br /> j <br /> r <br /> r <br /> Jacqueline R. Doub <br /> Project Engineer <br /> JRD/law <br /> cc: D. 1. Sheeks, Aegis Environmental, Inc. <br /> Margaret Lagorio, San Joaquin County Public,Health Services <br /> Environmental Health Division <br /> Attachments <br /> 69-013J.LTR -2- <br />