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�au�ux ra 2.2 Flap showing aitcs 10c"'"On r(llntiv" to r)s,te�sby lrrncfmarkts: Tho tsite location in gliown on Figuro I 2.3 Layout. of all undorground tanho and Pi pin�7 r�Yzrtrmc� t�ro��«rly labeled .for content: No tanks of linesronnF'igurax2,at on site. The former tank locations are depicted 2.4 Laboratory 1esults for initial sail sampling. soil samples were taken 'to After removal of the two fuel tanks,of the tankus' content" on site resources.. dotermino the impact ion Equipment Company, Inc. conducted the Stockton Service Staterformed by CalifOr- sampling. Analysis of the soil DAraplcsfl arcs p nia Water Labs, The moults Of the results azelyses are summarized in included in Appendix A. Table I. Complete laboratory product constituents Extremely high concentrations of patrolcu 2. This was probably were detected in the onmP100 from Tank kf o.rom the tank tort. Those due to tbo recent discharge resulting levels would indicGtQ that the samplau ware saturated or nearly saturated with product. 2.5 Estimates of liquid quantity and composition leakedt Duo to the age and condition of the tanksno estimate of total , liquid loss can be made. With the known volume would be tin sexcessuOf of the tank test, the total product los 1000 gallons. The constituents detected in the soil samples are typically derived from gasoline. 2.6 Topography, geology, hydrology: he ed by the U.S-D•A• Soil Conservation The site issituated been mapp vel terrain. The soils at tis aemfine- clayproperty adobe) . Stockton clay Service as Stockton o black ck`clay, deposited by Quiescent or slow textured, dark gray lace moving water. The parent material was of mixed origin, but primarily igneous rock. According to the survey some in-place development of soil soil is therred also..Q ul t of Ttrans;porhe a development ire- tig ht clay subsoil of the soil pro- deposition of very firesultinglin arhigh hcolloidal clay content file to the subsoil., and impervious structure in the subsoil. s is en they The importance ha the eabove soil propenificantly contribute to s site,sh ability exist at depth they g ast releases of petroleum fuels. to attenuate the impacts of any P Deeper lithology and site geology is related to the surface soils. The sits is mapped by the U.S. 0eoli icrAfilas da is "basin deposits." Basin deposits have lithver, intercalating layers nated oy fine-textured materials. However, 2