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PACIFIC <br /> ENVIRONMENTAL <br /> GROUP, INC <br /> Air M COMPMgY J _, <br /> January 12, 1999 <br /> Project 910-017 IA <br /> Mr Mike Infurna <br /> San Joaquin County <br /> Public Health Services <br /> Environmental Health Division <br /> 304 Weber Street, 3rd Floor <br /> Stockton, California 95202 <br /> Re Soil and Groundwater Investigation <br /> Former Unocal Service Station#0123 <br /> 1034 Central Avenue <br /> Tracy, California <br /> Dear Mr Infurna <br /> This letter has been prepared by Pacific Environmental Group, Inc (PEG) in response <br /> your comments regarding the above-referenced site made in a telephone conversation <br /> with Ms Jennifer McCollum of PEG on December 14, 1998 In that conversation, you <br /> stated that you had three concerns regarding the Soil and Groundwater Investigation <br /> Report for the site, submitted by PEG on December 2, 1998 Your comments are <br /> summarized in italics below, followed by PEG's response to each <br /> Comment 1 The tames that samples were collected were not recorded on the chain-of- <br /> custody forms In addition, the samples were collected on October 6, 1998, but were <br /> not relinquished to the refrigerator until the following day <br /> Response The sample time was inadvertently omitted from the chain-of-custody PEG <br /> has made efforts to prevent this error from reoccurring in the future The project <br /> geologist did not relinquish the samples to the refrigerator until the day after sampling <br /> because he did not return to the office on the day of the sampling However, samples <br /> were stored on ice overnight and were transported to the laboratory well within <br /> allowable holding times <br /> Comment 2 The reporting limit for methanol(1 0 mg/L) is not low enough San <br /> Joaquin County Public Health Services wants a detection limit of 0 5 mg/L for this <br /> constituent <br /> 11315 Sunrise Cold Circle, Suite M • Rancho Cordova, California 95742-6534 (916) 858-2350 FAX (916) 858-2355 <br />