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. RECHYED FES 252010 ENVIROWENT HEALTH Shaw Environmental,Inc. PERMIT/SERVICES 4005 Port Chicago Highway Concord,California 94520-1120 Phone,925.288.9898 %� 'Shaw 6�lpfltal, Ing Fax:925.288.0888 February 23,2010 Shaw Project No. 137813.03 Mr. Jeffrey Wong San Joaquin County Environmental Health Department 600 East Main Street Stockton, California 95202 Subject: Letter Work Plan for Planned Soil Sampling,AT&T Facility, 345 North San Joaquin Street,Stockton, California(UE042) Dear Mr. Wong: On behalf of AT&T, Shaw Environmental,Inc. (Shaw)is pleased to present this letter work plan detailing proposed soil sampling and laboratory analysis activities at the above-mentioned AT&T facility. AT&T is planning on replacing the subgrade piping leading from a 25,000- gallon diesel underground storage tank(UST)to the emergency backup generator at the above- mentioned AT&T facility. As part of the permit application,the San Joaquin County Environmental Health Department(SJCEHD)requested a work plan be submitted detailing collection and analysis of a soil sample from adjacent to the piping planned for removal. The following sections describe the proposed scope of work. Soil Sami ins Activities The approximately five-foot length of fuel piping and one hundred-foot length of vent line piping is located underneath a sidewalk along Lindsay Street(Figure 1). AT&T is planning on removing the primary fuel piping, and leaving the secondary containment in place to serve as rock guard for the new double-walled primary piping. In addition,AT&T is planning on pressure-testing the secondary containment of the vent line piping and replace if the secondary containment fails the test. At the request of the SJCEHD, soil samples are to be collected from along the fuel and vent line piping. In order to access subgrade soils,AT&T will arrange for coring of the concrete sidewalk at locations adjacent to the piping. One concrete core will be advanced within two feet of the fuel piping, and five concrete cores advanced within two feet of the vent piping every twenty feet, starting at the bend within the vent pipe near the UST and up to where the vent pipe transitions into the building. Proposed boring locations are depicted on Figure 1. Following coring, Shaw personnel will advance soil borings through the fill material into native soils to a depth of one to two feet below the base of the piping using a hand auger. A sample of the soil will then be collected from each of the six locations using a core barrel sampler lined 10-0010-stocktonWP I�{ G