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1 Emcon <br /> 3433 North Market Boulevard • Sacramento Call VAIr 97374-174 (936)928-3300 • Fax(916)928-3341 <br />' August 21, 1995 <br /> Project OF90-002 04 <br /> 1 / <br /> Mr George Takemon r /� <br /> A Teichert & Sons, Inc J <br /> 1 Equipment Administrator <br /> P O Box 15002 <br /> Sacramento, California 95851 <br /> 1 Re Second Quarter 1995 Status Report for A Teichert & Sons, Inc , Facility, Located <br /> at 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 during the second quarter 1995. Work included conducting <br /> 1 a supplemental investigation, groundwater monitoring, installation of a soil vapor <br /> extraction and air sparge system, and operations and maintenance of the remediation <br /> system The supplemental investigation consisted of drilling one soil boring and converting <br /> the boring into an air sparge weL. A—abient aur is injected into the air sparge well to <br /> increase removal of dissolved hydrocarbons and increase the efficiency of the reiriediatior! <br /> system Groundwater monitoring consisted of measuring depths to groundwater, <br /> 1 collecting groundwater samples from each well for subjective and laboratory analyses, <br /> measuring thickness of floating product (if present) in the wells, evaluating the <br /> groundwater gradient and direction of groundwater flow beneath the site Operation and <br /> maintenance is performed on the remediation system and consists of collecting 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 (EMCON, Problem <br /> 1 Assessment Report and Final Reme&ation Plan, 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 /> 1 overexcavation was terminated 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 /> 1 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 /> (EMCON, Problem Assessment Report and Final Remedcanon Plan, December 16, 1992). <br /> ' SAC\N 1PJ=F9MF'9"20 4cs-95 PAS 2 <br />