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Ira t"t**N I Z con 1433 North Market Boulevard • Sacramento California 95834 1943 • (916)928-3300 • Fax(916)928-3341 March 8, 1996 Project OF90-002 04 ow Aft Mr George Takemori RE( A M: D A Teichert & Sons, Inc MAR 9 1.9 98 Equipment Adrrunistrator PO Box 15002 Sacramento, California 95851 PLlM f/Sr 1VIC 5 Re Fourth Quarter 1995 Status Report for A Teichert & Sons, Inc , Facility, Located at 103 North E Street, Stockton, California Dear Mr Takemori At the request of A Teichert & Sons, Inc (Teichert), EMCON is conducting an environmental investigation at the subject site (see Figure 1) We have prepared this status report on the work conducted during the fourth quarter 1995 Work included conducting groundwater monitoring and operation and maintenance of the remediation system Groundwater monitoring consists of measuring depths to groundwater, collecting groundwater samples from each well for subjective and laboratory analyses, measuring thickness of floating product (if present) in the wells, and evaluating the groundwater gradient and direction of groundwater flow beneath the site Operation ane maintenance was performed on the remediation system and consists of collecting vapor samples and evaluating performance data from the remediation system BACKGROUND Two 5,000-gallon gasoline underground storage tanks (USTs) and one 1,000-gallon waste-oil UST were removed from the Teichert equipment site in October 1986 ("Problem Assessment Report and Final Remediation Plan," EMCON, December 16, 1992) These tanks were not replaced In September 1987, overexcavation of the impacted soil near the former tank complex was completed Based on safety and sidewall stability considerations, the overexcavation was terminated at a depth of approximately 38 feet below ground surface (bgs) As a result, residual concentrations of petroleum hydrocarbons remained in the soil at the north-central side of the excavation where the pump island was located, at the bottom (38 feet bgs) center of the tank excavation, and near the northwest corner of the excavation In August 1988, a 10,000-gallon-capacity regular gasoline storage tank was removed ("Problem Assessment Report and Final Remediation Plan," EMCON, December 16, 1992) • Two soil samples were collected from the tank excavation for laboratory analysis One of the samples contained detectable concentrations of benzene, toluene, ethylbenzene, and xylenes SAC1N 1PJ0\0F90V0F900020 4FS-951dms i