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�A <br /> a division o� ��� <br /> [RONMENTAL SOLUTIONS emcon <br /> April 30, 1999 <br /> Project OF90-002.07 <br /> Mr. George Takemori <br /> Equipment Administrator <br /> A. Teichert & Son, Inc. <br /> P.O. Box 15002 <br /> Sacramento, California 95851 <br /> Re: Groundwater Sampling, Analysis, and Site Closure Report for A. Teichert & Son, <br /> Inc., Facility, Located at 103 North E. Street, Stockton, California <br /> Dear Mr. Takemori: <br /> At the request of A. Teichert & Son, Inc. (Teichert), Pinnacle Environmental Solutions, a <br /> division of EMCON (Pinnacle), has prepared this groundwater sampling, analytical <br /> results and site closure report for the Teichert Stockton Maintenance facility located at <br /> 103 North E. Street, Stockton, California. This report summarizes the results of a recent <br /> groundwater sampling event conducted in March, 16, 1999 at the site (see Figure 1). <br /> Groundwater monitoring consisted of measuring depths to groundwater, collecting <br /> groundwater samples from the wells for subjective and laboratory analyses, and <br /> evaluating the groundwater gradient and direction of groundwater flow beneath the site. <br /> In addition, this report presents further discussion and rationale for site closure as <br /> previously requested in 1996. <br /> BACKGROUND <br /> The site is located at the intersection of North E Street and Weber Street and is within an <br /> industrial zone. In October 1986, two 5,000-gallon gasoline underground storage tanks <br /> (USTs) and one 1,000-gallon waste-oil UST were removed from the Teichert equipment <br /> site ("Problem Assessment Report and Final Remediation Plan," EMCON, December 16, <br /> 1992). These tanks were not replaced. In September 1987, overexcavation of the impacted <br /> soil near the former tank complex was completed. Based on safety and sidewall stability <br /> considerations, the overexcavation was terminated at a depth of approximately 38 feet <br /> below ground surface (bgs). Residual concentrations of petroleum hydrocarbons <br /> remained in the soil at the north-central side of the excavation where the pump island was <br /> located, at the bottom (38 feet bgs) center of the tank excavation, and near the northwest <br /> corner of the excavation. <br /> In August 1988, a 10,000-gallon regular gasoline storage tank was removed ("Problem <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 /> CPIE:17'EICHERZ\s,roCKTOMQTRLYISTKNQ199.DOC-9511s4! Waw <br /> 3939 Cambridge Road,Suite 220 Cameron Park,California 95682 (530)676-6884 (530)676-6885 Fax <br />