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Advanced <br /> GeoEnvironmental , Inc . <br /> 03 February 2012 RECEIVED <br /> AGE-NC Project No. 11-2040 <br /> 2012 <br /> Mr. Gary Stuart ENVIRONMENTAL HEALTH <br /> COMMUNITY BANK OF SAN JOAQUIN PERMIT/SERVICES <br /> 22 W. Yokuts Avenue <br /> Stockton, California 95207 <br /> Subject: Phase II Environmental Assessment Report <br /> Roek Property - Highway 99 <br /> 3736 South Highway 99, Stockton, California <br /> Dear Mr. Stewart: <br /> At your request, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Phase 11 <br /> Environmental Assessment Report for the property located at 3736 South Highway 99, <br /> Stockton, California. The scope of work included advancement of six soil borings for <br /> collection of soil samples. The location of the site is illustrated in Figure 1. A plan of the site <br /> is illustrated in Figure 2. Upon your approval, copies of this report will be transmitted to <br /> Mr. John Yoakum of the San Joaquin County Environmental Health Department <br /> (SJCEHD). <br /> INTRODUCTION/BACKGROUND <br /> It is our understanding that a truck repair facility has operated at the site (Warehouse 4) <br /> since the mid- to late 1980s. During a recent site reconnaissance, oil staining was noted <br /> in several locations throughout the truck repair/maintenance area. Additionally, mixed <br /> water and oil was observed flowing into a storm collection drain, underneath a parked truck <br /> in the area of Warehouse 4. <br /> A review of historical records indicate that two underground storage tanks (USTs) were <br /> removed from the property in March 1987. Soil samples collected beneath the USTs <br /> contained total extractable hydrocarbons, benzene, xylene, toluene and other volatile <br /> hydrocarbons at maximum concentrations of 3,300 milligrams per kilogram (mg/kg), <br /> 0.6 mg/kg, 89 mg/kg, 11 mg/kg and 840 mg/kg, respectively.A subsequent deeper sample <br /> contained toluene, xylene and total volatile petroleum hydrocarbons at concentrations of <br /> 1.2 mg/kg, 5.4 mg/kg and 13 mg/kg, respectively. Based on this information the case was <br /> closed by the local regulatory agency. However, this release was never assessed to <br /> determine the full vertical and lateral extent of the impacted soil. <br /> 837 Shaw Road• Stockton, CA 95215 <br /> Tc1cphonc(209)467-1006 •Fax (209)467-1118 <br />