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h, <br /> ERM-West, l ic. 11F'14. d <br /> Suite 200' 2001 P Street•Sacramento,California 95814-5213• (916)444-WEST(444-9378)•Telefax(916)444-5313 <br /> August 5, 1991T op <br /> Ms. Diane Hinson Aua OG *91 <br /> Environmental Health Specialist <br /> Public Health Services ENVi?ONMENAL HEALTH <br /> San-Joaquin County PERMIT/SERVICES <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> SUBJECT: Addendum to Workplan for Soil and Groundwater <br /> Investigation of Former Underground Tank Site at the Safeway <br /> Meat Packing Facility Located at 1111 Navy Drive, Stockton, CA <br /> Dear Ms. Hinson: <br /> This letter constitutes an Addendum to the Workplan previously submitted <br /> to your office for the subject site on March 4, 1991. Activities proposed in the <br /> Workplan were completed on March 7, 1991, and a Site Assessment Report <br /> (SAR) was submitted on May 9, 1991. In the SAR we recommended that <br /> additional investigation of soil and groundwater be performed following the <br /> detection of diesel in soil and,groundwater samples collected on March 7, <br /> 1991. The purpose of this Addendum is to review the investigation findings <br /> to date, and outline a scope of work for further investigation of the diesel <br /> impacted soil and groundwater at the site. <br /> Previous Findings <br /> Figures. A-1 and A-2 show the locations and concentrations of Total <br /> Petroleum=Hydrocarbons (TPH) detected to date at the site in soil and <br /> groundwater. Detections of petroleum hydrocarbons in soil have been in <br /> one area immediately southwest of the former tank locations. The only <br /> significant detection of petroleum hydrocarbons in groundwater was also in <br /> this same area. <br /> Groundwater flow direction at the site probably varies seasonally, but <br /> appears to have had a southerly component during the recent past. <br /> Groundwater flow in October 1989 was reportedly east southeast. ERM- <br /> West found the flow direction to be south on March 7 1991 and March 2 <br />,. 8, <br /> 1991. In addition, none of the existing monitoring wells situated north, east <br /> and west of the former tank locations have shown any significant detections <br /> of petroleum hydrocarbons in the groundwater. <br /> TIN <br /> An affiliate of The Environmental Resources Management Group with offices worldwide lfl�o <br />