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3ii LY:Regis En,.,irorimen+al jn 22—S0 0 :24FM• -It <br /> $330, <br /> # 2 <br /> �r dY <br /> AEGIS ENV IRONMBNTA� ULTANTS <br /> 801 Riverside Avenue,Suite C Roseville,CA 95678 915.782.2110 915.969.2110 FAX 916. 786.7830 <br /> June 22, 1990 V .t ` i.,„�� t� <br /> Environmental Health Permit/ Services �� <br /> San Joaquin Local Health District <br /> 1601 E. Hazelton Ave. <br /> Stockton CA. 95201 ENVIRONMENTA'HEA'Llt' <br /> PERMIT I SER - <br /> Attn: Steven K. Schneider <br /> Subject: Addendum <br /> Preliminary Subsurface Investigation/Tank Closure Report <br /> Shell Service Station <br /> 6131 pacific Avenue <br /> Stockton, CA <br /> Dear Mr. Schneider <br /> Per your request for additional comments regarding the above <br /> referenced site, Aegis Environmental Consultants lno. (Aegis) <br /> offers the following addendum to the above referenced report. <br /> c The product lines at the site were precision tested annually <br /> since 1986 . The product lines tested 'Might" in all cases. <br /> The cause of soil contamination found in the native soils <br /> beneath the product lines at the site is unknown. A possible <br /> cause for the contamination may be the accumulative effect <br /> of overfill of vehicles by customers. <br /> 0 As stated in the above referenced report excavation of soils <br /> beneath the product lines to a depth of three feet below <br /> grade will occur for the installation of the horizontal <br /> piping. During the excavation, where structurally feasible, <br /> every attempt will be made to excavate to clean. <br /> o The proposed pilot test of the vapor extraction system will <br /> include the estimation of the vertical and horizontal <br /> influence of the vapor extraction system. If data collected <br /> during the test indicates the existing proposed system is <br /> insufficient to solve the problem then a third vapor ' <br /> extraction well will be proposed at a location that the data <br /> indicates will best solve the problem. ` <br /> :y <br /> GEOLOGISTS ENGINEERS GROUND WATER SCIENTISTS <br /> ..,. ... _ <v JL ;.;�.m,aymw�a� A4.xeK� �i`.'—'�g3.�M•a,bvtrywe���tha ag t ., , ,,e� �'ai,: <br />