SITE INFORMATION AND CORRESPONDENCE_FILE 2

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Advanced GeoE nviron mental, Inc . - 27 February 2009 AGE-NC Project No. 95-0103 Ms. Margaret Lagorio Mr.Nuel Henderson San Joaquin County Environmental Health Department FEB 2009 600 East Main Street ENVIRONMENT HEALTH Stockton, CA 95202 PERMIT/SERVICES Subject: Request For Suspension of Remediation and Reduction of Quarterly Ground Water Monitoring CHAPIN BROTHERS, INC. 1766 Monte Diablo Avenue, Stockton, California Dear Ms. Lagorio: On behalf of Mr. Russell Chapin of CHAPIN BROTHERS INVESTMENTS., INC. Advanced GeoEnvironmental,Inc. (AGE)has prepared this letter to request a suspension of corrective action (ground water extraction) to establish a dissolved contaminate rebound after 18 months of active remediation (2.2 million gallons since September 2007 and 5.7 million since April 2002); thus evaluating the cost effectiveness of the corrective action. Based on the dissolved hydrocarbon concentrations detected recently and the concentrations documented following the previous hiatus of ground water extraction (2005-2007), the residual dissolved hydrocarbons are stable to the site or stable well previously remediated(MW-3 and MW-5);therefore,the site poses a low threat to the off-site ground water. Additionally reduction of quarterly ground water monitoring(wells MW-1 through MW-7)at 1766 Monte Diablo Avenue, Stockton, California (site). A sampling reduction to wells with relevant hydrocarbon impact: MW-4 and VE-6;with annual sampling of wells which have been remediated or remain outside the dissolved plume boundary: MW-1,MW-3 and MW-5 . This schedule should begin in the first quarter 2009 and evaluation of the corrective action will be based on these data. As you are aware, costs associated with the cleanup effort at the site were reimbursed by the California State Water Resources Control Board(SWRCB)under the Underground Storage Tank (UST) Cleanup Fund. However, Mr. Chapin was recently notified by the UST Cleanup Fund that future reimbursements by the State would be delayed as much as 18 months. Due to the costs of remediation activities (energy, discharge cost for water disposal and equipment monitoring costs) and ground water monitoring activities at the site, Mr. Chapin has accrued over $82,000 of remediation and monitoring expenses that have not been reimbursed by the UST Cleanup Fund. 837 Shaw Road, Stockton. California 95215 Telephone(209)467-1006 Fax(209)467-1118