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Advanced <br /> GeoEnvironmentai Inc . -o <br /> 24 January 2012 <br /> AGE-NC Project No. 11-2040 <br /> Mr. Mike Infurna <br /> San Joaquin County Environmental Health Department <br /> 600 E. Main Street <br /> Stockton, CA 95202 <br /> Subject: Phase II Environmental Assessment Work Plan <br /> Roek Property - Highway 99 <br /> 3735 South Highway 99, Stockton, California <br /> Dear Mr. Infurna: <br /> At the request of Mr. Gary Stewart, of the Community Bank of San Joaquin, Advanced <br /> GeoEnvironmental, Inc. (AGE) has prepared this Phase 11 Environmental Assessment <br /> Work Plan for the property located at 3735 South Highway 99, Stockton, California. The <br /> location of the site is illustrated in Figure 1. A plan of the site is illustrated in Figure 2. <br /> This Work Plan is prepared in accordance with San Joaquin County Environmental Health <br /> Department (EHD) guidelines for procurement of a boring permit. A boring permit <br /> application, application fee and Master File Record (MFR) form are attached. Upon EHD <br /> approval of the permit package, AGE will schedule the field work. AGE will provide EHD <br /> with a minimum of 72-hours prior notice for a grout inspection. <br /> INTRODUCTION <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 stating was noted in <br /> several locations throughout the truck repair/maintenance area. Additionally, mixed water <br /> and oil was observed flowing into a storm collection drain, underneath a parked truck in the <br /> 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. Samples collected beneath the USTs contained <br /> total extractable hydrocarbons, benzene, xylene, toluene and other volatile hydrocarbons <br /> at maximum concentrations of 3,300 milligrams per kilogram (mg/kg), 0.6 mg/kg, 89 mg/kg, <br /> 11 mg/kg and 840 mg/kg, respectively. A subsequent deeper sample contained toluene, <br /> xylene and total volatile petroleum hydrocarbons were reported at concentrations of 1 .2 <br /> 837 Slaw Road• Stockton,CA 95215 <br /> Telephone(209)467-1006 •Fax (209)467-1 1 1 R <br />