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erSchy Environme'ntaF"':'- <br />56`' <br />Mr. Michael J. Infurna, Jr. <br />San Joaquin County <br />Public Health Services <br />Environmental Health Division <br />P. 0. Box 2009 <br />Stockton, CA 95201 <br />APR 8 1998 <br />ENVIRONMENTAL HEALTH <br />PERMIT/SERVICES <br />April 6, 1998 <br />Re: Results of Underground Storage Tank (UST) Assessment, Super Stop Market, <br />Manteca, California <br />Dear Mr. Infurna: <br />HerSchy Environmental is pleased to present the results of the UST assessment at <br />the above -referenced site. The site is located at 290 North Main Street in Manteca. The <br />purpose of this work was to investigate soil conditions in the vicinity of and beneath <br />underground storage tanks (USTs) prior to installation of tank liners. The work consisted <br />of the hand augering angle borings to collect soil samples from below each end of three <br />existing 8,000 -gallon USTs used to store gasoline. Six borings (B-1 through B-6) were <br />drilled to evaluate soil conditions beneath the USTs (Figure 1). Borings B-1, B-2, and B- <br />6 were drilled to sample beneath the fill ends of the USTs, whereas the remaining borings <br />were drilled to sample beneath the non -fill ends. <br />Hand Auaering and Soil Sampling <br />Drilling was performed using hand operated augering equipment on March 24 <br />and 25, 1998. Because of the relationship between the angle of angering and the shape of <br />the USTs, samples were collected from a drill depth of approximately 17 feet from each <br />of the borings drilled at an approximate 45 degree angle. This is equivalent to a vertical <br />depth of 12 feet, an estimated two to three feet below the base of the USTs. The initial <br />boring (B-6) was drilled and sampled in the presence of Mr. Michael Infurna, Jr. <br />representing the San Joaquin County Environmental Health Division. <br />Soil was exposed for hand augering by first removing a small area of asphalt <br />pavement with an electric demolition hammer. Soil samples were collected using a drive <br />hammer equipped with brass liners. The samples were collected by driving the sampler <br />at the base of the hand augered boring. One soil sample was collected from the base of <br />37771 Berkshire Drive ♦ Madera, CA 93638 ♦ Phone: 209.645.4632 ♦ Fax: 209.645.4632 <br />