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�. r <br /> 639 Clay,Stockton <br /> West Clay Properties <br /> Page 2 - - - <br /> The screen section of MW-2 was set between 40 feet to 60 feet bsg. The vertical extent of <br /> the groundwater contamination at the old tank area has not been defined below 60 feet bsg. <br /> The southern extent of the contamination in groundwater at the area also has not been fully <br /> defined. Additional work to define the extent of the contamination is required. <br /> MTBE continues to be detected in the groundwater of the deepest well MW-9 (screened <br /> from 40 feet to 45 feet bsg) of the new tank area (the tanks were removed in 1998). The <br /> horizontal extents to the east, north, west also have not been defined. <br /> Submit a work plan that will define the vertical and horizontal extent of the groundwater and <br /> soil contamination at both the old and new tank areas to PHS/EHD by September 20, 2001. <br /> If you have any questions, please feel free to contact Jeffrey Wong at (209) 468-0335. <br /> Donna Heran, REHS,Director <br /> Environmental Health Division <br /> Jeffrey Wong ,, Senior REHS Marg�gono, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB, Central Valley Region- Marty Hartzell <br /> c: Advanced GeoEnvironmental,Inc. - Paul Dotsun <br />