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r GROUND ZERO ANALYSIS, INC. 1714 Main Street Escalon, California 95320-1927 Telephone: (209) 838-9888 ti rrl Facsimile: (209) 838-9883 , 1 9 2002 March 18, 2002 !_4 + v ` 'r, ES Mr. Michael Infurna San Joaquin County Environmental Health Department 304 E. Weber Ave., Third Floor Stockton, CA 95202 Subject: Workplan for Contamination Assessment Kooyman Property, 6781-6787 E. Jahant Road, Acampo, CA Dear Mr. Infurna: We are writing on behalf of the current property owner, Mr. Mike Kooyman, to present a workplan for assessment of possible soil contamination at the subject property. The proposed work is intended to provide an indication of the presence and magnitude of any soil contamination resulting from previous clandestine drug laboratory operations at the property. The proposed work is also intended to characterize the drummed water from the septic system as hazardous or non-hazardous. This will determine the options available for disposing of the water. We also propose collecting samples from the water remaining in the septic system for the same waste-characterization purposes. Background The previous owner of the property identified as 6781 - 6787 E. Jahant Road was issued a Notice and Order to Abate Housing and Dangerous Building Violations by the San Joaquin County Public Health Services, Environmental Health Division (EHD) on October 31, 2001. The order resulted from the discovery of suspected methamphetamine-manufacturing operations in a mobile home on the property (6781 E. Jahant Rd.). The previous owner retained Environmental Science Services, Inc. (ESSI) to conduct an inspection of the property and to collect samples to determine if contamination had resulted from the lab operations. ESSI inspected the property and collected samples from inside the mobile home and from inside a septic tank serving the mobile home. Samples of reddish-brown stains inside the mobile home were analyzed for phosphorus and iodide while the sample collected from the septic tank was analyzed for volatile organic compounds (VOCs) by EPA Method 8260 with open scan. The results of ESSI's work were reported in a letter to the previous owner dated December 19, 2001. The only analyte detected in any sample was toluene in the sample collected from the septic tank. Toluene was present at a concentration of 2,700 parts per million(ppm). It should be noted that the high level of toluene or other organics compelled the lab to dilute the sample and, consequently, the detection limits for the