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tkF1 KLEINFELDER ' APPENDIX A WORKPLAN ' SOIL EXCAVATION OBSERVATION AND LIMITED SOIL SAMPLING AND ANALYSES SJRTD SITE "O" SOUTHWEST CORNER OF N. CALIFORNIA AND E. CHANNEL STREETS ' STOCKTON, CALIFORNIA INTRODUCTION ' Kleinfelder is pleased to present this workplan to The San Joaquin Regional Transit District. This workplan was developed after correspondence with Mr. Wendell Krell, using Kleinfelder's ' current understanding of the site conditions, and is a preliminary understanding of the SJRTD desires. ' Kleinfelder is committed to providing quality service to its clients, commensurate with their wants, needs and desired level of risk. If a portion of this workplan does not meet the needs of the client, or if those needs have changed, Kleinfelder will consider appropriate modifications, ' subject to the standards of care to which we adhere as professionals. Modifications such as changes in scope, methodology, scheduling, and contract terms may result in changes to the risks assumed by the client as well as adjustments to our fees. We look forward to the opportunity to serve you. BACKGROUND On February 24, 2005 construction workers encountered an in-ground circular wooden structure and discolored soil during grading activities at the subject site (Plate 1). Kleinfelder was requested by SJRTD to visit the site to observe this area. Mr. Joe Zilles, Staff Geologist for Kleinfelder visited the site on February 25, 2005 and met Mr. Bob Kuhn of the SJRTD. ' According to SJRTD, Mr. John Jackson of the San Joaquin County Environmental Health Department (SJCEHD) also visited the site on February 25`h, prior to Kleinfelder's arrival. Kleinfelder observed what appeared to be the remnants of an in-ground redwood tank with a vertical orientation. This tank was located in the northeastern portion of the construction site. Approximately six inches of wood was protruding from the ground in an approximately eight- foot diameter circular pattern. The top of the wood was located approximately 4'/2 feet below site grade (bsg). The tank was filled with soil which in areas had a black discoloration with a strong petroleum-like odor. An approximately 18-inch rectangular pipe-like piece of metal was also noted in the vicinity of the wood. Dark stains and a strong odor were also noted in Iassociation with the metal piece. The discolored soil was covered with visqueen at the end of the meeting. On March 1, 2005, Kleinfelder Staff Geologist, Fran Bean, Mr. Wendell Krell of the SJRTD, Mr. Don Lawley of Don Lawley Construction (subcontractor for F&H Construction), and Mr. John Jackson of SJCEHD met at the SJRTD construction site. Mr. Lawley stated that workers