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D el n <br /> 1994 <br /> GROUNDWATER ,WNvPE ZM1M s �vICESLQ11TH <br /> 1-11-11 TECHNOLOGY, INC. 1401 Halyard Dnve,Suite 140,West Sacramento,CA 95691,(916)372-4700 <br /> FAX(916)372-8781 <br /> September 2, 1994 Project No 02070 5234 <br /> Ms Mary Meays, Senior REHS <br /> Environmental Health Division <br /> San Joaquin County-Public Health Services <br /> P O Box 388 <br /> Stockton, California 95201-0388 <br /> RE SOUTHLAND STORE #20680 <br /> 9110 THORNTON ROAD <br /> STOCKTON, CALIFORNIA <br /> Dear Ms Meays <br /> On behalf of The Southland Corporation (Southland), Groundwater Technology, Inc has prepared <br /> this letter in response to your letter dated July 12, 1994, regarding the Addendum to Closure Report, <br /> dated April 27, 1994 Attachment 1 is a revised potentiometric surface map with the most recent <br /> calculated gradient and groundwater elevation data, Including data for MWA 1 and MW-14 Field <br /> Data Sheets are enclosed in Attachment 2 Attachment 3 is revised Table 1 which includes the most <br /> recent (January 14, 1994) monitoring and sampling data Attachment 4 is revised Table 5 clarifying <br /> the vapor sample designation <br /> Groundwater Contamination <br /> Groundwater analytical data for the January 24, 1994 sampling event indicate a maximum of 1 part <br /> per billion (ppb) benzene and 34 ppb total petroleum hydrocarbons-as-gasoline (TPH-G) dissolved in <br /> groundwater Results of groundwater sampling since 1989 have indicated the presence of petroleum <br /> hydrocarbons at or below California drinking water standards in random samples in only one well, <br /> MWA The data indicate residual hydrocarbons exist in groundwater in concentrations at or below <br /> state maximum contaminant levels in a plume diminished in size to the vicinity of one well The data <br /> also shows that the shrinking dissolved hydrocarbon plume is stationary <br /> Offices throughout the U S,Canada and Overseas <br />