ARCHIVED REPORTS XR0001930 (2) - Laserfiche WebLink

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Mr. Cecchiru August 24, 1993 Page 3 Analytical results for well UST-1 are shown on 'gable 2 - Analytical Results of Ground Water Samples and on the enclosed laboratory certificates of analysis Ground water from UST-1 contained nondetectable concentrations of TPH[ as gasoline (Attachment IB). IBTEX constituents were also reported with benzene as nondetectable. TPM as diesel was reported at a concentration of 40 milligrams per Liter or mg/]L or parts per million. Analysis of the trip blank accompanying the UST-1 sample reported nondetectable concentrations of all analytes. Laboratory analytical documents are included as Attachment B. Analytical results for the two water supply wells, "big" and "small", reported nondetectable hydrocarbon constituents for all analytes and all drinking water constituents within regulatory thresholds for these values. Laboratory analytical documents are included as Attachment E Interim R m diati n e e o As a result of the continued detectable TPH in well UST-1, interim remediation was initiated for this site. Mr.Robert Cecchini performed weekly evacuation of water from Well UST-1 for a period of three months (third quarter 1993). He performed the following tasks: O Measured water and product levels in the well UST-1 using an electric water level sounder and recorded the data. 0 Evacuated approximately 55 gallons of water from well UST-1 using an electric submersible pump. The volume of water pumped from the well was recorded. The water evacuated from well UST-1 was stored in DOT rated drums in a secure area of the site. The site owners are currently pursing disposal through the City of Stockton sanitary system. aDocuments from the interim remediation activity are attached as Attachment C. A total of 550 gallons of water was evacuated from well UST-1 from May 15 to August 15 1993 Di cu ss i on The ground water elevation as calculated for well UST-1, has decreased 2.7 feet relative to that reported for April 1993. This decrease is likely due to seasonal changes. TPI-I as diesel and toluene, ethyl benzene and xylenes were detectable in well UST-1 at concentrations lower than that reported for Apnl 1993. TPH as gasoline was significantly reduced. ESE believes these reduced hydrocarbon concentrations are due to the interim rw remediation activities performed this quarter.