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California Water Service Co any Final Closure Report for Underground Storage Tank Removal 1602 E. Lafayette St., Stockton, CA The 3-inch pipes, the 2-inch pipe, the 1%-inch pipes and remains of the %-inch pipe were handled and disposed of as hazardous waste. All these pipelines associated with the USTs were disposed of as hazardous waste under manifest at ECI in Richmond, CA. 2.4 Closure of short length piping under the building All pipes were removed up to the building foundation. The two 3-inch pipes cut at the building foundation were surveyed with a camera and it was discovered that one extended approximately 6 feet horizontally under the building and the other approximately 9 feet horizontally under the building and both terminated in concrete plugs. These 2 pipes were probe tested on December 27, 2011 and were found to be firmly embedded in the concrete foundation of the building. The 1%2-inch pipe also extended approximately 6 feet horizontally under the building and terminated in concrete. All 3 pipes were at a depth of approximately 3 feet below grade. On January 10, 2012, the two sections of 3-inch pipes and the 1%-inch pipe were grouted with non-shrink grout into the foundation and closed in place under a SJCEHD closure in place permit. These pipes were first cleaned of any oil and "swabbed" to remove any residues with a light detergent and rags. Soil sampling was performed under the building in the area below the piping run to determine the background condition of the native soils in this location. A drilling/boring permit was submitted to the SJCEHD for the soil sampling under the foundation. A location was chosen approximately at the original "oil feed" location inside the building, approximately 20 feet from the north wall. The boring was performed in a sawcut area 1' by 3' and the soil sample was collected approximately 6 feet vertically from the top of concrete, which was approximately 3 feet below the pipes and two feet into the native soils in the area below the pipes. The soil sample was delivered under chain of custody for analysis at a State Certified Laboratory for similar constituents of concern as the previous soils samples. 3.0 SAMPLING &ANALYTICAL RESULTS Soil sampling activities were observed by the SJCEHD and copies of the analytical results were sent directly from McCampbell Analytical to the County as requested. Soil samples were analyzed for Total Petroleum Hydrocarbons in the gasoline range (TPHg), TPH in the diesel range (TPHd), ' Volatile Organic Compounds (VOCs) including BTEX, CL HC, Oxygenates (MTBE, TBA, DIPE, ETBE, TAME), 1,2 DCA, and EDB, PCBs, Luft Metals (Cd, Cr, Pb, Ni, and Zn), and hexavalent chromium (Cr VI). The analytical results received to date are presented in Table 1.0. CHOW ENGINEERING,G NEERING, INC. 4