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7AT <br /> TAIT ENVIRONMENTAL MANAGEMENT,INC. -- . <br /> January 15, 1999 <br /> ENVIRONMENTAL HEALTH DIVISION <br /> 304 E. Weber Ave.Third Floor <br /> P. O. Boz 388, Stoc,kton CA 95201-0388 <br /> Approved <br /> Harlin Knoll Denied ❑ <br /> County Of San Joaquin Public Health Services Conditions Was&, F#b <br /> Post Office Box 388 <br /> Stockton, California 95201-0388 Date i- 9 g by Atkinbtk <br /> SUBJECT: WORKPLAN TO PERFORM A SITE ASSESSMENT JAQUIN <br /> COUNTY MOTOR POOL FACILITY LOCATED �-T�810 EAST <br /> HAZELTON IN THE CITY OF STOCKTON, CALIFORNIA <br /> Dear Mr. Knoll: <br /> Tait Environmental Management, Inc. (TEM), is pleased to submit this workplan on behalf of <br /> the County of San Joaquin Public Works to perform a site assessment at San Joaquin Countys <br /> Motor Pool facility (SITE) located at 1810 East Hazelton, in the city of Stockton, California. <br /> This workplan has been prepared in accordance with information provided the San Joaquin <br /> County Public Health Services, Environmental Health Division. <br /> TECHNICAL APPROACH <br /> For purposes of identification, the above referenced project will be separated into four (4) <br /> areas of concern. Area 1 represents Tank # 3, a gasoline underground storage tank (UST) <br /> removed in 1995. Area 2 represents the tank replacement activities that occurred in November <br /> 1998 from Tanks # 1, 2. Area 3 represents Tanks # 6 through 8, which were removed prior to <br /> 1979. Area 4 represents Tank # 4, a waste oil UST. <br /> AREA 1 <br /> TEM proposes to advance one (1) boring until 20 feet of uncontaminated soil is encountered or <br /> groundwater is detected. If groundwater is identified, the boring will be advanced an <br /> additional 15 feet for the installation of a nested monitoring and vapor well. The boring will <br /> be continuously cored to identify changes in lithology and sampling will occur at five-foot <br /> intervals. A mobile lab will be used to run the analysis of the soil samples. See Figure 1. <br /> AREA 2 <br /> TEM proposes to advance one (1) boring by Tank # 1 until 20 feet of uncontaminated soil is <br /> encountered or groundwater is detected. If groundwater is identified, the boring will be <br /> advanced an additional 15 feet for the installation of a monitoring well. Soil samples will be <br /> taken at five-foot intervals. A mobile lab will be used to analyze the soil samples. <br /> 1100 Town&Country Road • Suite 1200 • Orange, CA 92868 • (714)560-8200 • (714)560-8211 FAX <br /> Other Locations: San Diego,CA • Concord,CA • Sacramento,CA • Phoenix,AZ • Tucson,AZ <br /> Established 1964 <br />