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s r <br /> 2 M C 0 n <br /> 1433 North Market Boulevard +Sacramento California 95834-1943 • (916)928-3300• Fax(916)928-3341 <br /> i <br /> May 30, 1996 <br /> Project OF90-002 04 <br /> Mr George Takemon <br /> Equipment Administrator <br /> A Teichert& Sons, Inc <br /> P O Box 15002 <br /> Sacramento, California 95851 <br /> Re First Quarter 1996 Status Report for A Teichert & Sons, Inc , Facility, Located at <br /> 103 North E Street, Stockton, California <br /> Dear Mr Takemon <br /> At the request of A Teichert & Sons, Inc (Teichert), EMCON is conducting an <br /> environmental investigation at the subject site (see Figure 1) We have prepared this status <br /> report on the work conducted dunng the first quarter 1996 Work included conducting <br /> groundwater monitoring and operating and maintaining the remediation system <br /> Groundwater monitoring consists of measuring depths to groundwater, collecting <br /> . groundwater samples from each well for subjective and laboratory analyses, measuring <br /> thickness of floating product (if present) in the wells, and evaluating the groundwater <br /> gradient and direction of groundwater flow beneath the site Operation and maintenance <br /> was performed on the remediation system and consists of collecting vapor samples and <br /> evaluating performance data from the remediation system <br /> BACKGROUND <br /> Two 5,000-gallon gasoline underground storage tanks (USTs) and one 1,000-gallon waste-oil <br /> UST were removed from the Teichert equipment site in October 1986 ("Problem Assessment <br /> Report and Final Remediation Plan," EMCON, December 16, 1992) These tanks were not <br /> replaced In September 1987, overexcavation of the impacted soil near the former tank <br /> complex was completed Based on safety and sidewall stability considerations, the <br /> overexcavation was ternunated at a depth of approximately 38 feet below ground surface <br /> (bgs) As a result, residual concentrations of petroleum hydrocarbons remained in the soil <br /> at the north-central side of the excavation where the pump island was located, at the <br /> bottom (38 feet bgs) center of the tank excavation, and near the northwest corner of the <br /> excavation <br /> In August 1988, a 10,000-gallon-capacity regular gasoline storage tank was removed <br /> ("Problem Assessment Report and Final Remediation Plan," EMCON, December 16, 1992) <br /> Two soil samples were collected from the tank excavation for laboratory analysis One of the <br /> samples contained detectable concentrations of benzene, toluene, ethylbenzene, and xylenes <br /> SAON TIMF9MF900020 4Hs-95�" 1 <br />