SITE INFORMATION AND CORRESPONDENCE

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i 18 December 2002 AGE Project No. 96-0229 Page 2 of 2 of increasing MTBE concentrations at well MW-10A (located 375 feet northeast ofthe site) have been reported since March 2001 , 3 . AGE discussed the site conditions that were conducive for aground water extraction pump- and-treat system; AGE identified the First Water Zone at depths between 25 feet bsg and 45 feetbsg. In addition, AGE referenced apparently positive results from interim remediation at the adjacent Pacific Mini Mart site. 4. Mr. Info ma advised that a site conceptual model will need to be included in an upcoming report, and additional lateral and vertical investigation (i.e. multi-level monitoring wells) will be necessary to complete site assessment. 5 . Mr. Influma requested from AGE that ( 1) a table be submitted to him which includes analytical results from the 25 November 2002 ground water monitoring event (2) that a lithologic cross section be completed between wells MW-5 and MW42 to evaluate the down-gradient migrational pathways, and (3) that a cross sectional view (snap-shot) of the site be submitted with upcoming quarterly reports that includes current ground water analytical data. As a result of the above referenced meeting, AGE recommends at this time that an interim remediation work plan be submitted for a ground water extraction (pump-and-treat) system to halt further down-gradient migration of the plume of contamination; upon SJCEHD approval, AGE will submit a detailed cost estimate to the UST Cleanup Fund for cost approval. If you have any questions or require further information, please contact our office at (209) 467- 1006. Sincerely, Advanced GeoEnvironmental, Inc. Timothy J. Cuellar Calvin F. Lee Project Geologist Senior Project Geologist Registered Geologist No. 7327 Enclosures cc : Mr. Jerry Castro, Pacific Car Wash Mr. Marty Hartzell, Regional Water Quality Control Board - Central Valley Region Advanced GeoEnviron nental, Inc.