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Advanced <br /> GeoEnvironmental, Inc. <br /> 25 January 2013 <br /> AGE-NC Project No. 12-2181 <br /> Mr. Naidu Muniappa RECID MAR 15 2013 <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, CA 95202 <br /> Subject: Aboveground Storage Tank Thickness Testing <br /> MOUNTAIN VALLEY EXPRESS <br /> 1019 Bessemer Avenue, Manteca, California <br /> Dear Mr. Muniappa: <br /> At your request, Advanced GeoEnvironmental, Inc. (AGE) collected ultrasonic thickness <br /> gauge measurements on 24 January 2013, from the aboveground storage tank (AST) <br /> utilized by Mountain Valley Express (MVE) for purposes of temporary waste oil storage. <br /> This inspection is an addendum to the AGE prepared Aboveground Storage Tank and <br /> Secondary Containment Assessment report dated 27 August 2012. <br /> Material thickness was gauged using an Olympus 38 DL Plus Ultrasonic Thickness <br /> Gauge meter. Loose debris was wiped off each line of measure prior to collecting <br /> material thickness measurements. A gel couplant, was applied to the measurement <br /> location prior to data collection. Table 5 and Figure 4 identify collected thickness <br /> measurements and most reasonably accessible points during the inspection. <br /> Measurements were collected along ten lines of measure ranging between seven and <br /> ten points. A total of eighty (80) measurement were collected between 0.108 inches <br /> and 0.118 inches. Based upon collected data, all measured thicknesses were above <br /> the AST manufacturer Gauge 12 thickness of 0.1046 on 24 January 2013. <br /> Our professional services were performed using that degree of care and skill ordinarily <br /> exercised by environmental consultants practicing in this or similar localities. Evaluation <br /> of the conditions at the site for the purpose of this investigation was made from a limited <br /> number of available data points (field measurements, ultrasonic thickness gauge <br /> measurement points, etc.) and conditions may vary away from these data points. No <br /> other warranty, expressed or implied, is made as to the professional interpretations, <br /> opinions and recommendations contained in this report. <br /> 837 Shaw Road•Stockton,CA 95215 <br /> Telephone(209)467-1006•Fax(209)467-1118 <br />