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,JK !� ' "E C; <br /> ��� � 3. <br /> J U N 12 1992 <br /> ENVIRONMENTAL HEALTH <br /> �RN11� /��RVIC�� <br /> AEGIS ENVIRONMENTAL , IN � . <br /> 1050 Melody Lane, Suite 160, Roseville, CA 95678 + 916.782-2110 1 916-969-2110 I FAX 916.786-7830 <br /> June 9, 1992 <br /> Ms. Mary Meays <br /> San Joaquin County Public Health Services <br /> Post Office Box 2009 <br /> Stockton, California 95201 <br /> Subject: Shell Service Station (WIC No. 204-7524-0808) <br /> 7190 Lower Sacramento Road, Stockton, California <br /> Dear Ms. Meays: <br /> The letter prepared by San Joaquin County Public Health Services dated April 17, 1992, <br /> has been reviewed by Shell Oil Company (Shell) and Aegis Environmental Inc. (Aegis). <br /> On behalf of Shell, Aegis wishes to submit the following comments in regard to the <br /> installation of an additional monitoring well at the subject site. <br /> Shell has and continues to abide by the agreement established in the November 1991 <br /> meeting, to monitor groundwater beneath the site. Petroleum hydrocarbons have not <br /> been detected in groundwater beneath the site for over seven quarters. As agreed upon <br /> in the November 1991 meeting, continued groundwater monitoring was to be in lieu of <br /> further investigation/remediation at the site. <br /> Specifically, your letter expressed concerns that the horizontal and vertical extent of <br /> contamination of petroleum hydrocarbons in soil associated with the northern dispenser <br /> have not been established. A single soil sample (T-3) collected from beneath the <br /> dispenser island contained 1,510 parts-per-million total petroleum hydrocarbons, as <br /> gasoline. A review of Section 4.1, "Extent of Petroleum Hydrocarbons Constituents in <br /> Soils; Problem Assessment Report," (Delta Environmental, Inc.; October 1990) indicates <br /> that soil boring S-1 was advanced on October 10, 1989, to evaluate the vertical extent of <br /> petroleum hydrocarbons at the location of the' northern dispenser. The location of soil <br /> boring S-1 was approximately 10 feet south of the location of soil sample T-3. Results of <br /> that investigation indicted that petroleum hydrocarbons were not present at depths of <br /> 11-1/2 and 44-1/2 feet below surface. <br /> 91-231C.LTR <br /> GEOLOGISTS ENGINEERS • GROUNDWATER SCIENTISTS <br />