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File No. 249947 20 May 1991 Page 4 ' maintenance building. However, by extending the survey areas beyond what we believed to be the targeted areas, our survey did include the area of the maintenance building.) The geophysical survey found two anomalies (i.e., possible tanks) in the ' approximate location of the bus maintenance building, as shown on Figure 3. No anomalies were found in the vicinity of the former bus garage. ' Car Wash. The car wash appears on City of Lodi aerial photographs as two small rectangular canopies, as shown on Figures 2 and 3. County Assessor records indicate that the car wash was built in 1959, at the site later occupied by the Mandarin House Restaurant. Demolition of the car wash occurred in August 1973. ' Dr. Henry Bader, former property owner, spoke to us about the demolition of the car wash. According to Dr. Bader, the concrete pad for the car wash was left in place; only the building itself was dismantled. An asphalt pad was placed over the concrete pad, Dr. Bader stated, leaving in place any underground conduits which may have existed at the site. ' At the site, a single row of three drains is visible directly west of the former location of the Mandarin House Restaurant. These drains are connected to sand and grease traps which were used to drain the rinsewater from the car wash operation. Since two canopies are visible in the photographs, but only one set of drains can be seen, it seems likely that a second row of traps may exist under the foundation of the now-demolished restaurant. ' Appendix A contains photographs of one of the sand and grease traps on the site, as well as diagrams of a typical sand and grease trap. A sand and grease trap functions much like a septic tank. Rinsewater from the car wash entered the two chambered tank through a surface drain. Heavier sand and grease particles sank to the bottom of the trap, while lighter oily products ' floated on top of the water. Effluent pipes drew water from the center of the chamber into a leachfield, leaving the petroleum products and sand behind. The water is eventually absorbed by the surrounding soil. Periodic maintanence of the ' traps was necessary to allow for their proper functioning. As far as we were able to determine, no such maintenance has occured since the car wash was closed. ANGERSGN CGNSULTING GROUP 0