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Mcon <br /> 1433 North Market Boulevard •Sacramento California 95834-1943 • (916)928-33Dti• Fox(916)928-3341 <br /> i <br /> August 15, 1996 <br /> Project OF90-002 05' <br /> s <br /> Mr George Takemori <br /> Equipment Administrator <br /> A Teichert & Son, Inc. <br /> P O Box 15002 <br /> Sacramento, California 95851 <br /> Re Second Quarter 1996 Status and Site Closure Report for A. Teichert & Son, Inc , <br /> Facility, Located at 103 North E Street, Stockton, California <br /> Dear Mr Takemori <br /> At the request of A Teichert & Son, Inc (Teichert), EMCON has prepared this quarterly <br /> status and site closure report This report summarizes the results of soil and groundwater ` <br /> investigations and work conducted during the second quarter 1996, which included <br /> groundwater monitoring at the subject site (see Figure 1) Groundwater monitoi-in$- <br /> consisted of measuring depths to groundwater, collecting groundwater samples froM the <br /> wells for subjective and laboratory analyses, and evaluating the groundwater gradient and <br /> direction of groundwater flow beneath the site In addition, this report presents the <br /> cumulative soil and groundwater data and rationale for requesting site closure <br /> BACKGROZAD <br /> The site is located at the intersection of North E Street and Weber Street and is within an r �' <br /> industrial zone In October 1986, two 5,000-gallon gasoline underground storage tanks V <br /> (USTs) and one 1,000-gallon waste-oil UST were removed from the Teichert equipment site <br /> ("Problem Assessment Report and Final Remediation Plan," EMCON, December 16, 1992) <br /> These tanks were not replaced In September 1987, overeat yauon of the-impactO soil <br /> near the former tank complex was completed Based on safety and sidewall stability <br /> considerations, the overexcavation was ternunated at a depth of approximately 34 feet <br /> below ground surface (bgs) Residual concentrations of petroleum hydrocarbons,>cM=ed <br /> in the soil at the north-central side of the excavation where the pump island was located, <br /> at the bottom (38 feet bgs) center of the tank excavation, and near the northwest corner of <br /> the excavation <br /> In August 1988, a 10,000-gallon regular gasoline storage tank was removed ("PMblem <br /> Assessment Report and Final Remediation Plan," EMCON, December 16, 1992) Two soil <br /> samples were collected from the tank excavation for laboratory analysis One of the samples <br /> contained detectable concentrations of benzene, toluene, ethylbenzene, and xylenes (BTEX), <br /> however, BTEX was not detected in the other sample Total petroleum hydrocarbons as <br /> SA(--,\N-,PJMFgMF900020 SAS-95\fw l <br />