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,R <br /> Ins <br /> s <br /> 1.0 Introduction <br /> This report presents the results of a <br /> investigation for hydrocarbon contamination n City aoe <br /> CaliforniaStoc. property located on Fontana Avenue in Stockton, <br /> Calior (Figures 1). The <br /> Smiths Canal Pumping Plant operated i� Occupied by the <br /> Utilities Department. The bit as Y the Municipal <br /> Waste Water Treatment Plant s cu ed b the <br /> ie as-a 4000 <br /> un ergroun u 4nran <br /> Ig'a tank for use by auxiliary <br /> power generators (Figure 2)„ <br /> An estimated 1100 gallons of diesel fuel was reportedly <br /> leafed from this 4000 <br /> an inadvertent gallon fiberglass tank__ as a result o€ <br /> Puncture. T'he tank <br /> been:: repaired '.axad:'is <br /> currently in' ative service; although it is scheduled to be <br /> replaced with a 1000 gallon above ground tank within the <br /> next nine months. Investigations conducted in May:'3988 by " <br /> Ensco Environmental Services Inc. recorded ; per:; l3 <br /> million (PPM "concentration of *otal a 18U ,part" S <br /> as diesel in a soil sample collected at a de tank. A co um hydrocarbons <br /> d c rbont <br /> the Ensco report summarizing this sat lin pY of <br /> below grade (g-1) on the north side of th <br /> Appendix I. Because of the known loss in <br /> Of fuel consented <br /> soil sampling adjacent to the tank, the San Joaquin County <br /> Public Health Services, Environmental Health Division <br /> (SJCPHSEHD) required an investigation to assess the extent <br /> of contamination. <br /> This invests ation <br /> This -investigation <br /> rk's g was conducted in accordance with <br /> Proposal dated April 20, 1989 which was <br /> submitted to the SJCPHSEHD for prior approval. The <br /> proosal <br /> was drafted and the investigation conducted in accordance <br /> - with the Tri Regional Guidelines prepared by the Regional <br /> Water Quality Control Hoard. <br /> 2.0 Site Setting <br /> Nw The project site is situated on level terrain comprised of <br /> Quaternary-Recent alluvial sediments. The site is bounded <br /> on the south property line by the westerly flowing Smiths <br /> Canal (Figure 1). Groundwater flow is currently north to <br /> northeast, away from the canal, although seasonal reversals <br /> are likely to occur. Due to the proximi o <br /> water table is relatively shallow, - banal the <br /> a� lstI ' <br /> -� Near surface materials in the area consist of <br /> interbedded sands, silts, cl&ys, and gravels. As is typical <br /> of alluvial environments, higher <br /> ity <br /> representiaig former stream . char®ls Occur s as lsinesous nor <br /> lenticular features. Locations Of wells within one mile of <br /> the project site provided by the Department of Water <br /> Resources (DWR) are Plotted on Figure 3. The closest well to <br /> the tank location is located on the property approximately <br /> `i 85 feet north of the diesel tank, This well is not <br /> 1 <br /> Ih=. <br />