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V 1.� <br /> 2520 Venture Oaks Way,Suite 250 <br /> URS Greiner Woodward Clyde Sacramento,CA 95833-3200 <br /> A Division of URS Corporation Tei:916.929.2346 <br /> ��� �� �� �� I�ax:916 .929.7263 <br /> Uta t i ffices Worldwide <br /> March 13, 2000 <br /> Ms. Carol Oz, R.E.H.S. <br /> LOP/Site Mitigation Unit <br /> San Joaquin County—Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Reference: Workplan for Environmental Services at the California Highway Patrol Facility <br /> Located at 385 West Grantline Road in Tracy, California <br /> RESD Work Order No. CHP702 <br /> URSGWC Project No.41-03014214-02 <br /> Dear Ms. Oz: <br /> URS Greiner Woodward Clyde, Inc. (URSGWC) is pleased to present this workplan to conduct a soil and <br /> groundwater investigation at the California Highway Patrol (CHP)facility located 385 West Grantline Road in <br /> Tracy, California (Site). This workplan has been prepared on behalf of the State of California—Real Estate <br /> Services Division under Contract No. 3014214. The following pages present the background and proposed scope <br /> of work. <br /> BACKGROUND <br /> A single-walled gasoline fuel underground storage tank (UST) is located at the Site. A soil investigation was <br /> conducted by Alton Geosciences in March 1999 to comply with UST upgrading requirements. The investigation <br /> included drilling and sampling four soil borings. The borings were extended to approximately 25 feet below <br /> ground surface (bgs). Groundwater was encountered at approximately at five to seven feet bgs. Soil samples <br /> were collected at 10 and 25 feet bgs from each boring and submitted for laboratory analyses of total petroleum <br /> hydrocarbons as gasoline(TPH-G);benzene,toluene,ethylbenzene, and xylenes(BTEX). The samples collected <br /> at 25 feet bgs were also analyzed for methyl tertiary butyl ether (MTBE). The analytical results reported <br /> concentrations of MTBE in all four soil samples collected at 25 feet bgs at concentrations ranging from 0.004 to <br /> 0.093 milligrams per kilogram. TPH-G and BTEX were not detected in any of the samples collected at 10 or 25 <br /> feet bgs. Based on these analytical results,the San Joaquin County Environmental Health Division(SJCEHD) <br /> requested that a soil and groundwater investigation be completed at the Site. <br /> SCOPE OF WORK <br /> URSGWC is proposing the installation of three groundwater monitoring wells at the Site to assess the lateral and <br /> vertical extent of soil and groundwater contamination. This workplan includes a discussion of permitting, <br /> groundwater monitoring well installation, groundwater monitoring well development, quarterly groundwater <br /> monitoring well sampling and report preparation. A copy of the URSGWC Health and Safety plan will be on-site <br /> during the drilling and sampling operations. <br /> LA 4214102_Tracy\Workp1an.doc <br />