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SMTH <br /> ETNIAOMMENTAL TECHNOLOGIES CORPORATION i ,) {�, <br /> September 22, 1995 <br /> 94-337 <br /> Ms. Mary Meays <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 388 <br /> Stockton , California 95201-0388 <br /> Subject: Third Quarter, 1995 Status Report and Soil Sampling Plan, Manteca Unified <br /> School District, 2901 East Louise Avenue, Lathrop, California <br /> Dear Ms. Meays: <br /> This report summarizes the results of the environmental investigation conducted during the <br /> third quarter 1995 by Smith Environmental Technologies Corporation (Smith Environmental) <br /> at the subject site shown on Figure 1. The work was conducted at the request of the Manteca <br /> Unified School District and San Joaquin County Public Health Services (SJCPHS). The work <br /> included measuring depth to groundwater, collecting groundwater samples from the wells for <br /> subjective and laboratory analyses, evaluating the groundwater gradient, estimating the volume <br /> of residual petroleum hydrocarbon impacted soil and developing a soil sampling plan for the <br /> stockpiled soil onsite. <br /> BACKGROUND <br /> Two underground storage tanks were removed from the site by SEMCO in June 1993, The <br /> tanks, one 12,000-gallon gasoline and one 12,000-gallon diesel, were removed on June 15, <br /> 1993, and analytical results for soil samples collected during the tank removal recorded <br /> elevated concentrations of petroleum hydrocarbons. A 1,000-gallon tank had been previously <br /> removed. <br /> On July 7 through 9, 1993, the former tank location was over-excavated to a depth of 19 feet <br /> below ground surface (bgs). Some soil and groundwater samples collected from the <br /> excavation on July 8 and 9, 1993, contained concentrations of total petroleum hydrocarbons as <br /> gasoline (TPHg), benzene, toluene, ethylbenzene and xylenes (BTEX) above method detection <br /> limits. <br /> n:115010713QTR95 <br /> 1710 Main Street • Escalon,CA 95320 (209)838-3507 • fax(209)838-3509 <br /> Engineering • Consulting Remediation • Construction <br />