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rw � <br /> r J i <br /> SEP 1 0 1992 <br /> ENVIRONMENTAL HEALTH <br /> PERMIT/SI_IYIOFs <br /> AEGI S ENVIRONMENTAL , INC . <br /> 1050 Melody Lane, Suite 160, Roseville,CA 95678 + 916.782-2110/916.969-2110/FAX 916.786-7830 <br /> September 8, 1992 <br /> Ms. Linda Turkette <br /> San Joaquin Public Health Services <br /> Environmental Health Division <br /> Post Office Box 2009 <br /> Stockton, California 95201 <br /> Subject: Shell Service Station WIC No. 204-7524-4305 <br /> 620 West Charter Way, Stockton, California <br /> Dear Ms. Turkette: <br /> This letter is being sent in response to San Joaquin County Public Health Service's letter <br /> dated August 20, 1992. Shell Oil Company (Shell) will agree to install one groundwater <br /> monitoring well to the east of the subject site. This well will require off-site access <br /> permission from the current property owner. Aegis Environmental, Inc. (Aegis), is <br /> currently pursuing the activity. Upon receipt of an executed right-of-entry agreement, <br /> Aegis will submit a workplan for the additional off-site well. <br /> Regarding the issue of vapor extraction technology at the subject site, Aegis is planning <br /> a "phased approach" to remediation. The basis for implementing the phased approach <br /> is vapor extraction is considerably more capable of removing volatile organic compounds <br /> (VOC) from the subsurface than groundwater extraction and traditional air stripping <br /> technologies. In some cases the difference is as much 100 times. In addition to the <br /> removal of vadose zone contamination, the vapor extraction will remove VOC from the <br /> Capillary fri,``ige (inC iudi ng separate phase hydrocarbons' arid enhance the biodegradation <br /> of the dissolved phase constituents. <br /> It is our desire to begin operation of the vapor extraction system, monitor, and evaluate <br /> operational efficiencies and effectiveness. If necessary at this phase, Aegis will initiate <br /> groundwater extraction. In this manner, a more cohesive remediation program may <br /> commence. At this junctura, it is unclear whether the current system is adequate to <br /> mitigate the problem. Therefore, the most expeditious manner to complete the assigned <br /> goal is to begin operation of the vapor extraction system. Reference is made in the <br /> August 20, 1992, letter than you are uncertain whether the groundwater remediation <br /> system is adequate so we are assuming you will agree that we should begin operation <br /> of that which is properly designed and installed. <br /> 91-246C.LTR <br /> GEOLOGISTS • ENGINEERS • GROUNDWATER SCIENTISTS <br />