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PRE-TANK REPLACEMENT Site Assessment Work Plan <br />4315 Waterloo Road Stockton, CA. <br />Aegis Project No. 89-047 <br />Page 7 <br />2.5 Spill, Leak and Accident History <br />A review of San Joaquin County Health District records indicates that <br />tank system tightness tests have been conducted on the underground <br />fuel storage tanks and dispensing system according to San Joaquin <br />County guidelines since 1986. Since that time, the tanks have been reported as "tight". Records documenting the environmental history of <br />the site and age of the tanks will be reviewed as part of this work <br />plan. <br />2.6 Utilities <br />Prior to beginning any field work, Underground Service Alert (USA) <br />will be contacted and all underground utilities marked to prevent <br />drilling through subsurface utilities. Additionally, to prevent <br />drilling through sub-surface utilities, the first five feet of all <br />borings will be advanced by hand sugaring techniques. <br />2.6.1 On-Site Underground Utilities <br />Underground utilities that service the site include water, electric <br />and sanitary sewer. Locations of the underground utilities are shown <br />on Figure 2. Electric and telephone service is accessed to the site <br />from Waterloo Road from sub-surface utility box located at the <br />southeast corner of the site. Electric and telephone service is <br />provided to the office building via underground cable along the <br />eastern border of the site. The sanitary sewer accesses the property <br />from Waterloo Road. The water service is also accessed from Waterloo <br />Road. <br />2.6.2 Off-Site Utilities <br />Approximate locations of electricity, water, sanitary sewer and storm <br />sewer lines beneath Waterloo Road are shown on Figure 3. The City of <br />Stockton maintains the storm sewers. Pacific Gas and Electric <br />maintains the electric service in the area. Cal Water maintains the <br />water service in the area. <br />2.7 Site Subsurface Conditions <br />Surface geologic units in the vicinity of the site are depicted on the <br />"Geologic Map of California" as Quaternary basin alluvium consisting <br />of unconsolidated poorly sorted basin deposits from clay to boulder <br />size. The deposits are considered to be of Holocene age (10,000 years <br />ago to present). Underlying the Holocene Alluvium is the Pleistocene Victor Formation which consists of unconsolidated sands, silts (with <br />varying degrees of cementation), clays and gravels along old stream <br />channels which vary from 0-100 feet thick.