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E t Environmen' " <br /> i 9 `3 Fr,k --8 aF; 10. 56 <br /> ir <br /> April 6, 1998 <br /> Mr Michael J Infurna, Jr <br /> San Joaquin County <br /> Public Health Services <br /> Environmental Health Division <br /> P O Box 2009 <br /> Stockton, CA 95201 <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 bonngs <br /> were dulled to sample beneath the non-fill ends <br /> Hand Augering and Soil Sampling <br /> Drilling was performed using hand operated augenng equipment on March 24 <br /> and 25, 1998 Because of the relationship between the angle of augering 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 />