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f <br /> envrros® <br /> DATA SUMMARY <br /> Shell Service Station <br /> 4445 Pershing Avenue <br /> Stockton, California <br /> WIC# 204-7524-2408 <br /> Site Description and History <br /> The site is located on the southwest corner of the intersection of Rose Marie Lane and <br /> Pershing Avenue in Stockton, California The facility is an active service station Three <br /> 12,000 gallon double walled fiberglass underground fuel storage tanks and one 550 <br /> gallon double walled fiberglass underground waste oil tank are in use at the site The <br /> surface of the site is flat and paved The surrounding area is commercial/residential in <br /> nature <br /> In 1989, Aegis Environmental Consultants conducted a pre-tank replacement subsurface <br /> investigation A total of 12 soil borings were drilled to assess subsurface conditions of <br /> soil in the vicinity of the existing underground storage tank (UST) pit and the new UST <br /> location The soil borings were drilled to 21 5 feet below grade (fbg) Ground water was <br /> not encountered in any of the borings Boring logs for these borings are presented in <br /> Appendix C <br /> One soil sample from each boring drilled adjacent to the existing UST pit (B-1 through <br /> B-4) and four soil samples from the borings drilled in the new UST location (B-5 through <br />• B-12) were submitted for laboratory analyses Total petroleum hydrocarbons as gasoline <br /> (TPH-G), total petroleum hydrocarbons as diesel (TPH-D) and total petroleum <br /> hydrocarbons as motor oil (TPH-M) were not detected in any soil sample collected <br /> Benzene, toluene, ethylbenzene, and xylenes (BTEX) were also not detected in soil <br /> samples collected except for Iow concentrations of benzene on the order of 0 07 ppm <br /> benzene at 20 fbg in Boring B-4 Boring locations and analytical results are presented in <br /> Appendix A <br /> Two 5,000 gallon USTs, one 7,500 gallon UST, and one 10,000 gallon UST were <br /> removed from the site in early 1990 and replaced with three 12,000 gallon double walled <br /> fiberglass USTs, installed in a different location Soil samples collected during the tank <br /> removal indicated that soil beneath the former USTs had been impacted by petroleum <br /> hydrocarbons TPH-G concentrations ranged from none detected (ND) to 4300 ppm <br /> Benzene concentrations ranged from ND to 10 ppm Soil analytical results and soil <br /> sample locations are presented in Appendix A <br /> In July 1990, Aegis Environmental, Inc , installed three ground water monitoring wells <br /> (MW-1 through MW-3) and two vapor extraction wells (VEW-1 and VEW-2) The <br /> boring logs and well construction details are presented in Appendix C A total of seven <br /> soil samples from the five borings were submitted for laboratory analyses TPH-G <br /> concentrations in soil ranged from ND to 1 2 ppm Benzene concentrations in soil ranged <br /> from ND to 0 13 ppm Ground water samples were collected from the three wells <br /> Petroleum hydrocarbons were not detected in the water samples <br /> Based on the analytical data collected during these investigations, the hydrocarbon <br /> impacted soil was delineated and limited to the vicinity of the former UST pit and ground <br /> • water beneath the site had not been impacted with petroleum hydrocarbons Boring <br /> 96373 1 <br />