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Advanced GeoEnvironmental, Inc. 10 December 2015 AGE Project No. 12-2181 Mr. Dan Souza MOUNTAIN VALLEY EXPRESS 1019 Bessemer Avenue, Manteca, California Subject: Aboveground Storage Tank General Containment Evaluation (Secondary Containment Oil Tank) MOUNTAIN VALLEY EXPRESS 1019 Bessemer Avenue, Manteca, California Dear Mr. Souza: At your request, Advanced GeoEnvironmental, Inc. (AGE) inspected the aboveground storage tanks (ASTs) utilized by Mountain Valley Express (MVE) for purposes of oil storage. Two ASTs (fuel and waste oil) with double wall structures were noted in the area of a single walled oil tank. Spill Prevention, Control, and Countermeasure (SPCC) Plan (Plan) 40 CFR part 112 required the Facility to respond in a safe, effective and timely manner to mitigate the impacts of a discharge and to preventing discharges of oil to navigable waters. The facility was construction with the AST system (fuel, oil and waste oil storage) with a 100 foot by 70 foot secondary containment pad with a three -stage oil water separator, draining into the City of Manteca sewer system. The area and volume of the pad area and in ground separator alone is suitable to contain the volume of new oil stored in the single wall steel AST. MVE is responsible to prevent and abate oil spills with intent not to discharge petroleum into the municipal sewer system; the secondary containment drainage pad does not discharge to the public nor private stormwater system connected to a surface water body and any spill outside the pad would be abated with a land-based response (oil spill from truck). Additionally, Facility management has determined that this Facility does not pose a risk of substantial harm under 40 CFR part 112, as recorded in the "Substantial Harm Determination". 837 Shaw Road • Stockton, CA 95215 Telephone (209) 467-1006 • Fax (209) 467-1 1 18