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rft-` ;A `r `�l_Tfi3750 Auburn Blvd, Suite A <br /> Sacramento, <br /> # 4, s� SI x Ii✓ Sacramento, CA 95821 <br /> ENGINEERING AND ENVIRONMENTAL SERVICES,- 2. 27 Telephone (916) 485-7222 <br /> FAX (916) 485-8098 <br /> 30 November 1993 <br /> Mr. Bill Vizza <br /> Public Works Director <br /> City of Tracy <br /> 520 Tracy Boulevard <br /> Tracy, California 95376 <br /> Subject: Groundwater Investigation - 301 W Grantline <br /> Tracy, California <br /> HLI 10101 <br /> Dear Mr. Vizza <br /> Enclosed are the results of the soil and groundwater investigation conducted at the former <br /> site of a 1,000-gallon capacity underground diesel storage (UST) tank at Fire Station <br /> Number 2 located at 301 W. Grantline Road in Tracy, California. The investigation was <br /> conducted in accordance with our 10 August 1993 Work Plan and the County's Permit issued <br /> on 5 October 1993. <br /> �• On 15 March 1989, the UST failed tank system integrity pressure testing In response to <br /> the failed test, the City of Tracy reported the testing results to San Joaquin County and <br /> exposed the UST and its piping and performed a helium test to identify the source of <br /> leakage. Results of the helium testing revealed the source of leakage was a vent pipe <br /> connection located thirty six inches above the top of the UST. Since the leaking <br /> connection was above the maximum product level of the tank, it was assumed that the <br /> quantity of diesel fuel leaked was limited to the 0 206 gallons lost during the initial tank <br /> integrity testing. <br /> City of Tracy records indicate that the leaking vent pipe connection was repaired and a fill <br /> line spill protector was installed on 15 May 1989. Contaminated soil was reported to have <br /> been excavated and remediated using an aeration process <br /> During October 1989, the UST system was excavated and disposed as a result of the City <br /> of Tracy converting from diesel fuel to propane fuel for the Fire Station Number 2 backup <br /> power generator. <br /> This report summarizes monitoring well installation and sampling procedures, presents <br /> boring logs with descriptions of soil lithologies encountered while drilling, a groundwater <br /> gradient map, and the results of analysis of soil and groundwater samples. Petroleum <br /> hydrocarbon compounds as diesel, benzene, toluene, ethylbenzene and total xylenes were <br /> not detected in either soil or groundwater samples at concentrations greater than their <br /> method detection limits. These results indicate that leakage from the former underground <br />