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CENTRAL VALLEY REGIONAL WATER QUALITY CONTROL BOARD <br /> INSPECTION REPORT <br /> 26 February 1991 <br /> DISCHARGER: CITY OF TRACY <br /> LOCATION & COUNTY: TRACY, SAN JOAQUIN COUNTY <br /> CONTACT(S): PAUL VERMA <br /> INSPECTION DATE: 4 JANUARY 1991 <br /> INSPECTED BY: ROBERT EVANS <br /> ACCOMPANIED BY: MICHAEL NEGRETE, RWQCB <br /> JAMES SAMIANY, CITY OF TRACY <br /> OBSERVATIONS AND COMMENTS: <br /> On 4 January 1991, Michael Negrete and I inspected the City of Tracy's (City) Schulte Road <br /> Extension project and the site of Tracy Airport Land Treatment Facility adjacent to Corral <br /> Hollow Road. The City is proposing to build a Class II land treatment facility on nine <br /> acres of City-owned property to treat soils removed from the Schulte Road Extension project <br /> that are contaminated with petroleum hydrocarbons. <br /> Historical data indicates that Bunker "C" or fuel oil was stored in a concrete bunker <br /> located in the path of the Schulte Road extension project. During our inspection we <br /> noticed a diesel odor emanating from the Schulte Road excavation site. We took pictures <br /> of the current excavations and grading. Most of the irrigation ditch in the area of known <br /> contamination has been excavated and graded. We also noted a piece of concrete (near <br /> Station 24+50, see 12 December 1990 SCS Engineers report) which appeared to be from the <br /> original concrete bunker. The concrete was approximately eight inches thick with four <br /> inches of solidified oil and five inches of dark black soil with a diesel-like smell . We <br /> were unable to estimate the thickness of the dark black soil . <br /> Soil excavated from the area will be taken to the land treatment site at the Tracy <br /> Municipal Airport. The City proposes to temporarily store and then treat up to 12,000 <br /> cubic yards of petroleum contaminated soils. The contaminated soils will be stored in 75 <br /> X 150 foot visqueen lined containment cells until a bioremediation plan is approved. A <br /> workplan to describe and demonstrate how the soils will be treated has not yet been <br /> submitted. After treating to an undetermined clean up level , the soil will be <br /> appropriately disposed. <br /> Michael Negrete and I took two samples from the black soil on top of the piece of concrete <br /> and another soil sample was taken five feet from the concrete in the irrigation ditch. <br /> Sample results are as follows: <br />