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GROUND ZERO ANALYSIS, INC. 1714 Main Street Escalon,California 95320 S A FJ 10 A Q U I c a COUNTY Telephone: (209)838-9888 E N Y IR C N H E N T A L Facsimile: (209)838-9883 HEALTH DEPARTMENT May 16,2005 Mr. Mike Infurna San Joaquin County Environmental Health Department 304 East Weber Avenue, Third Floor Stockton, CA 95202 Subject: Results of Subsurface Investigation 26237 East Miller Avenue,Escalon, California Dear Mr. Infurna: On April 8, 2005 Ground Zero Analysis, Inc. (Ground Zero) performed a subsurface investigation at the subject site (Figure 1). Ground Zero conducted the investigation to provide an indication of the presence and magnitude of any soil contamination resulting from previous clandestine drug laboratory operations at the property. The investigation was conducted at the request of and under the direction of the San Joaquin County Environmental Health Department (EHD). BACKGROUND On June 24, 2004, Network Environmental Systems, Inc. (NES) inspected the subject property, which was known to have been affected by clandestine drug laboratory activity. The work was conducted in response to a letter from the EHD dated August 17, 2004. NES collected wipe samples from various locations inside the mobile home. Soil samples were also collected from soil adjacent to the house and the irrigation well, and a water sample was collected from the septic tank serving the mobile home. Samples were analyzed for chloride, phosphorus, iodide, pH, and methamphetamine. Methamphetamine was detected in the wipe samples collected by NES. The water sample collected from the septic system also contained methamphetamine, as well as low levels of phosphorus and chloride. The soil samples did not contain methamphetamine but did contain elevated levels of phosphorus. The results of NES's work were reported in a Preliminary Site Assessment Report created for the owner, Mr. Robert Van Spronsen,dated July 23,2004. G:\GROUNDZE\Berberian\SBreport.doc