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0 <br /> AEGIS ENVIRONMENTAL , INC . <br /> 1050 Melody Lane, Suite 160, Roseville, CA 95678 ♦ 916 •782-2110 1 916 969-2110 1 FAX 916.786-7830 <br /> March 18, 1992 <br /> MAR 2 3 1992 <br /> EiNV1i;' .:; iVitr'w IfAL HEALTH <br /> Ms. Mary Meays PERMIT/IQJEI�VICES <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 /> 7910 Lower Sacramento Road, Stockton, California <br /> Site Code 1660 <br /> Dear Ms. Meays: <br /> The letter prepared by San Joaquin County Public Health Services (SJCPHS), dated <br /> January 29, 1992, has been reviewed by Shell Oil Company (Shell) and Aegis <br /> Environmental Inc. (Aegis). On behalf of Shell, Aegis wishes to submit the following <br /> comments in regard to the installation of an additional monitoring well at the subject site. <br /> Soils and alluvial materials beneath the site as logged in monitoring well and soil borings <br /> drilled by Delta Environmental Inc. (Delta), consist of interlayered clay and silt with lenses <br /> of silty sand. A soil sample (T-3) was collected in January 1989, at an approximate depth <br /> of 3 feet below ground surface. Analysis of the sample indicated a concentration of <br /> approximately 1,510 parts-per-million total petroleum hydrocarbons, as gasoline. The <br /> depth to groundwater at the site has been consistently measured not shallower than 57 <br /> feet below grade. Thus, the deepest documented occurrence of petroleum hydrocarbons <br /> in soil is more than 50 feet above groundwater surface. <br /> Additionally, groundwater beneath the site has been monitored since August 15, 1989. <br /> Analysis of groundwater samples collected during the last five quarters has indicated none <br /> of the samples contained petroleum hydrocarbons above laboratory detection limits. <br /> For the above reasons, the installation of an additional groundwater monitoring well does <br /> not appear to be warranted at this time. An additional groundwater investigation was not <br /> agreed to by Shell during a meeting with SJCPHS staff on November 22, 1991. <br /> 91-231A.LTR <br /> GEOLOGISTS • ENGINEERS • GROUNDWATER SCIENTISTS <br />