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qkAUSE CONSTRUCTION ENGINEERING WORK PLAN Sheldon Oil Company - Stockton Site -,2ilb_�E. Miner Avenue Backaround The Sheldon Oil Company Miner Avenue - Stockton Site is an active asphalt batch plant owned by Sheldon Oil Company and currently operated by Kent's Oil Service. OHM, Inc. removed a 265,000 gallon underground storage tank from the site in 1991, during which approximately 2,000 9 cubic yards of soil was excavated and stockpiled. (See Exhibit 1, Samples were taken throughout the excavation and a site assessment prepared by OHM. Analytical results revealed that the major contaminant of concern was TPH(diesel) at ranges to 7,300 ppm. (See Analysis, Exhibit 2) The overall soil matrix is low permeability clayey silt. There is also some debris including con- crete refuse, wood timbers and piping. Technology Overview This site will undergo accelerated enzyme catalyzed metabolic remediation using FyreZymi' enhanced bioremediation. This process blends specially selected stabilized enzymes with specific nutrients, emulsifiers, surfactants and suspension agents to accelerate the bacterial activity and drastically reduce the time required for normal biological degradation to an average of 45 days or less. This accelerated bioremedial process will be employed on-site in a totally enclosed, fixed biocell. The proprietary FyreZymel process overcomes traditional bioremedial limitations by using specially selected enzymes which perform two very important functions: 1) They chemically react to cleave the hydroxyl molecule in long chain hydrocarbons result- ing in enzyme-catalyzed metabolic remediation which significantly accelerates the remedia- tion process. In most projects completed to date, contamination was reduced to below action levels within 30 days. 2) They break down the physiochemical bonds between the clay platlets by neutralizing the electric charge. This drastically improves permeability and releases the trapped hydrocarbon contaminants,making them available to the bacteria. The process increases the degradation rate of difficult to degrade compounds with a high molecular weight. These conditions are commonly found in contaminants with hydrocarbon chains in excess of C12 such as; aviation fuels; transformer oils; lubricating oils (motor oils) and bunker- fuel oils, asphalts, and diesel fuel under weathered conditions. (See Exhibit 3, Microbes) M ..: ,.r ¢ er»cirr,.=;ia¢s¢sras..:¢a:»^ure:¢:¢arii°s.,r'a.:>as .¢;en;e<wa:e a:a»;exa. :ar-.:aa-:::.6ra.::: a:e ame:.:e.e-:e:.:a:e:a:ec •a¢.:,. -eE::a::-rS:, i....e-;c» .zr•aa. ..4"rtare4° -- -„n. .... n-4.d.:-......<.e>.>...._....d..,....''”tt,.,.....•e•3....ms_.._a..e8...:?. n......•.•...?"e..,=`eic.± :_...._u....Anr aa€ ra: r3e¢Fai$ ra:3tsac 7 19320 Del Rio • Woodbridge CA 95258 • Phone 2091368-9229 • Fax 2091368-6055