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HORIZbN ENVIRONMENVAL INC• ` <br /> r43�eration <br /> Specialists in Site Assessment,RemedicItTesting D2s <br /> °5 Nov Aid 11 51 <br /> November 15, 1995 <br /> Ms. Diane Hinson <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Street, Third Floor <br /> P.O. Box 388 <br /> Stockton, California 95201 <br /> Subject: Executive Summary of Workman <br /> Former Discovery Chevrolet, 1615 11th Street, Tracy, California. <br /> Ms. Hinson: <br /> This letter summarizes the work to be performed as interim soil remediation associated with the <br /> former gasoline underground storage tanks (UST) at the above-referenced site. Approximate <br /> location of the former USTs is shown on the attached Site Plan. This work is described in the <br /> Workplan dated October 25, 1995 and approved during a meeting between Ms. Michelle Nokes <br /> of Winner Ford, Mr. Gary Barker of Horizon Environmental Inc. (Horizon), and Ms. Diane <br /> Hinson of the San Joaquin County Public Health Services (SJCPHS) on November 7, 1995. <br /> The interim soil remediation is in response to the discovery of gasoline hydrocarbons in soil <br /> when the two gasoline USTs were removed. The purpose is to remove hydrocarbon bearing soil <br /> which may be a source of hydrocarbons into the groundwater. Soil samples collected at the base <br /> of the UST excavation after removal were analyzed and found to contain total petroleum <br /> hydrocarbons as gasoline(TPHg)at concentrations ranging from 920 to 4,400 parts per million <br /> (ppm). <br /> To complete interim soil remediation the following scope of work will be performed; <br /> • Obtain permits, prepare a site safety plan, notify Underground Service Alert and schedule <br /> contractors. <br /> • Excavate approximately 400 cubic yards of soil form the former gasoline UST cavity. <br /> The excavation will be approximately 11 feet deep by 25 feet wide by 35 feet long. <br /> During excavation, the soil will be sampled and screened with an Organic Vapor Meter <br /> (OVM) to evaluate hydrocarbon concentrations in the soil. If the OVM screening <br /> indicates that the excavation has reached the lateral limits of hydrocarbon impact, a soil <br /> sample will be collected and transported to an onsite mobile laboratory for analyses. Soil <br /> samples will be analyzed for total petroleum hydrocarbons as gasoline (TPHg) and <br /> benzene, toluene, ethylbenzene, and xylenes. <br /> 5011 Golden Foothill Parkway,Suite 7 • EI Dorado Hills,CA 95762 • (916)939-2170 • FAX(916)939-2172 <br /> P.O. Box 5283 • Bakersfield,CA 93388 • (805)589-8983 • FAX(805)589-1456 <br />