SITE INFORMATION AND CORRESPONDENCE

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Advanced GeoEnvironmental, Inc . 18 March 2003 AGE-NC Project No. 96-0229 MAR 2 1 2003 Ljavlr'.%UNMENT HEALTH Mr. Michael J. Infurna Jr., Senior REHS PERMITISERVICES San Joaquin County Environmental Health Department 304 East Weber Avenue, Third Floor Stockton, CA 95202 Subject: Feasibility Studies Work Plan Addendum March 2003 PACIFIC CAR WASH- 4405 Pacific Avenue, Stockton, California Dear Mr. Inf nna: In accordance with a San Joaquin County Environmental Health Department(S.ICEHD)letter;dated 30 January 2003,Advanced GeoEnvironmental,Inc. (AGE)is in the process of evaluating soil vapor extraction (SVE)/in-situ air sparing (IAS) and ground water extraction (GWE) as interim remediation measures for 4405 Pacific Avenue, Stockton, California (site). In the above referenced SJCEHD letter, it was stated that staff from both the SJCEHD and the Central Valley Regional Water Quality Control Board (CVRWQCB) met on 09 January 2003 to discuss AGE's choice of GWE for interim remedial action at the site. At that meeting, the CVRWQCB disagreed with AGE's selection of GWE and believed that SVE/IAS interim remedial efforts at the `core' of the ground water plume would be a more prudent expenditure of funds and effort;in addition,the CVRWQCB requested that additional GWE supporting evidence(i.,-. ground water pumping test data) and arguments be submitted for regulatory review. To date, there have been no SVE/IAS or GWE field tests, or soil testing of intrinsic permeability, moisture content and porosity, which AGE typically utilizes in selecting an appropriate remedial method for a site. AGE had submitted Feasibility Studies and Monitoring Well Installation Work Plan, dated 15 February 2002 and approved by the SJCEHD on 15 March 2002, for testing SVE, IAS and GWE, in vadose zone and First Water. However, the work plan was denied by the LIST Cleanup Fund(USTCF) on 26 June 2002, during the cost preapproval process; the USTCF stated that they did not find the above referenced remediation testing reasonable or necessary when multiple remedial technologies (i.e. SVE/IAS and GWP) were tested in the same media and the same hydrostatic interval In a subsequent meeting between AGE and the SJCEHD on 17 December 2002,the status of the site investigation was discussed, and both AGE and the SJCEHD concluded that there was an immediate need for interim remediation. Due to the lack of site--specific remediation field testing and USTCF 837 Shaw Road,Stockton,California 95215 Telephone(209)467-1006 FAX(209)467-1118