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' r i l�Cri l/ l±v V.i��ali\V/Ci�~�i��i ■ Consulting Engineers 3336 Bradshaw Rcad.Suite 320 Sacramento.Cal.`xma 95827 26 January 1987 916-362-3251 Mr. Tom Terrill Reynolds and Brown 1200 Concord Avenue, Suite 200 Concord, CA 94520 Subject: Handyman Warehouse Underground Storage Tank Assessment Report Tracy, California K/J/C 866156 Dear Mr. Terrill: In accordance with our Agreement, dated 15 December 1986, we have completed an assessment of the two underground fuel storage tanks at the Handyman Warehouse, 724 East Grantline Road , Tracy, California. The results of this assessment are presented in this report. The tanks are not presently in use. It is our understanding that Reynolds and Brown is considering removing the tanks and - associated piping and fuel pumps. The objective of this assess- ment was to determine whether significant quantities of product stored in the underground tanks have leaked and are present in soil and groundwater at the site in concentrations that - warrant remediation during tank removal_ To perform the assessment, a ground penetrating radar survey was conducted to locate the tank , four boreholes were drilled to collect soil samples, and one borehole was completed as a monitoring well to collect groundwater samples. Soil and groundwater samples collected during field activities were analyzed on a priority basis. The procedures followed during our assessment are described in detail in the remainder of this report. Conclusions are presented in the final section of this report. Based on the information obtained, it is our opinion that no significant remediation activities are warranted. GROUND PENETRATING RADAR SURVEY A ground penetrating radar survey of the site was conducted to attempt to confirm the approximate location of the two under- ground storage tanks . Ground penetrating radar surveying uses the reflection of high-frequency radio waves to located inter- faces that represent changes in electrical conductivity ( such as