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• INTRODUCTION <br /> This report summarizes the field activities performed at 25650 Highway 99 <br /> North in Acampo, California (Figure 1) during the recent removal of the <br /> underground storage tanks (USTs). Removal and excavation activities were <br /> performed by Golden West Builders of Livermore, California. Touchstone <br /> Developments (TD) was present on-site to observe the UST removal and soil <br /> stockpiling. The soil sampling and analysis described in this report were <br /> performed December 15, 1993 and December 17, 1993 to comply with the <br /> current San Joaquin County Public Health Services, Environmental Health guide- <br /> lines. <br /> SITE DESCRIPTION <br /> The site is occupied by Chevron Service Station number 9-2396. Two USTs were <br /> removed prior to these field activities on August 25, 1993. A 550 gallon waste <br /> oil tank located north of the station building, and one 550 gallon heating oil tank <br /> located east of the building (Touchstone Developments Tank Removal Report <br /> dated September 20, 1993). For this phase of work four USTs were removed on <br /> December 15, 1993. One 10,000 gallon single walled steel tank, two 6000 gallon <br /> single walled steel tanks, and one 3000 gallon single walled steel tank (Figure 1). <br /> All tanks formerly contained unleaded gasoline. <br /> FIELD EXCAVATION ACTIVITIES <br /> UST removal was witnessed by Enc W.Trevena,Senior Registered Environmental <br /> Health Specialist from San Joaquin County Public Health Services, Environmental <br /> Health Division, Steve Dalton from the San Joaquin County Fire Prevention <br /> Bureau, and Brett Hunter from Chevron U.S.A. <br /> The tanks were transported under manifest and disposed of by Erickson Inc., <br /> Richmond, California. Approximately 200 cubic yards of soil were removed and <br /> stockpiled on site during UST removal and excavation. All tanks appeared to be <br /> in good condition; no holes were observed. <br /> Approximately 1000 cubic yards of soil were excavated and stockpiled on-site <br /> following UST removal to facilitate the installation of new tanks. <br /> SOIL SAMPLING <br /> Excavation and product line soil samples were taken from the excavator bucket <br /> by removing the top few inches of soil and pushing a clean, six-inch-long (two <br /> inches in diameter) brass sample tube into the soil until completely full. The ends <br /> of the tubes were covered with aluminum foil and sealed with plastic end caps. <br /> The samples were then labeled, placed in a cooler with ice, entered on a Cham- <br />