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J. H...LEI N FELDER & ASSOC.,ATES <br />GEOTECHNICAL CONSULTANTS • MATERIALS TESTING <br />LAND & WATER RESOURCES <br />2825 EAST MYRTLE STREET <br />STOCKTON, CA 95205-4794 <br />(209) 948-1345 <br />File No. E-2688-1 <br />June 12, 1985 <br />Woolsey Oil, Inc. <br />166 Frank West Circle <br />Stockton, California 95206 <br />At'Lention: Mr. Bruce Woolsey <br />Subject: INSTALLATION OF MONITORING WELL <br />AND HYDROCARBON TESTS <br />ROBERTS OIL COMPANYMODI, CA <br />Gentlemen: <br />As per your request, our firm drilled and installed one monitoring well at <br />the subject site. The scope of our work was as follows: <br />1. Obtain necessary county permits for monitoring well <br />construction. <br />2. Drill, obtain soil samples and install a 2 -inch diameter <br />monitoring well. <br />3. Have the soil samples analyzed for hydrocarbons. <br />4. Obtain water samples from the well for hydrocarbon testing. <br />On May 15, 1985, our personnel obtained an application for a permit from <br />San Joaquin County Environmental Health Department for the installation of a <br />monitoring well at the above subject site. A drilling crew and field engineer <br />from our firm then traveled to the site and drilled, obtained soil samples and <br />installed a monitoring well at a location chosen by your representative. The <br />well was located in an area adjacent to three above -ground storage tanks used to <br />store motor fuels. Surface soil staining in the general area where the well was <br />installed would indicate that some product spillage had occurred at one time. <br />The monitoring well was drilled and installed to a total depth of 46.5 feet <br />below ground surface. Free groundwater was encountered at approximately 37 feet <br />below ground surface. The wells were constructed using 2 -inch diameter PVC <br />casing with the bottom 15 feet of the casing being machine slotted. The annular <br />space was backfilled with sand to approximately 2 feet above the slotted por- <br />tion. A 1 -foot bentonite pellet seal was then placed above the sand with the <br />remainder of the annular space backfilled to the surface with concrete. A <br />concrete utility box was then cemented into place for surface protection of the <br />well head. <br />OTHER OFFICES: <br />Walnut Creek •San Ramon •Sacramento •Fresno •Fairfield • Merced • Rohnert Park •Los Angeles •Reno •Las Vegas • St. George, Utah •Denver 1 n <br />