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Wm. J. Hunter & Associates 2701 Cottage Way, Ste 25 <br /> Sacramento, CA 95825 <br /> Registered Geologists (916) 972-7941 <br /> Petroleum & Mineral Appraisers <br /> December 21 , 1990 SEC <br /> Lawrie A. Cutta, RENS p <br /> Environmental Health Division CsrY+I)/� 4L �f€ <br /> San Joaquin Co. Public Health Services '� �t <br /> Ref: Site Code 1359 <br /> Dear Mrs. Cotulla; <br /> I have reviewed your letter of December 17 addressed to Lodi <br /> Ready Mix , concerning the SAR prepared by my office, and feel <br /> that a response is necessary to clarify the issues raised. I <br /> will address the items in the order listed in the letter. <br /> 1. Based upon information available to this office, the depth to <br /> ground water as measured by the San Joaquin Flood Control <br /> District is approximately 53 feet. Based upon that data, the <br /> leaching potential analysis worksheet included in the SAR is <br /> correct; (53 ' - 25' = 28' , ) the score would be 5, not zero, and <br /> the total score would be 43, as shown on the worksheet. <br /> 2 It is understood that the environmental fate worksheet is not <br /> designed to be used for single samples, but was included to <br /> indicate the relative degree of contamination present if it is <br /> assumed that the soil above the sample depth is clean. <br /> 3. The depth to groundwater was obtained from a recent map <br /> issued by the County Flood Control District, which shows it to be <br /> at approximately 53' . Would you please furnish my office with <br /> the data indicating groundwater has been as high as 40 feet in <br /> this area, including dates, or provide us with the source of such <br /> information so that we may review the data and add it to our <br /> files. <br /> I would also appreciate it if you would furnish us a map showing <br /> the locations of current or past groundwater investigations in <br /> the area, including monitoring wells, so that we can research <br /> that material for passible inclusion in future workplans and <br /> reports. <br /> When we have received the data, and discussed the findings with <br /> our client,, we will advise your office of our suggested approach <br /> to resolution of this matter. <br /> Your r , <br /> 1 <br /> Will J. Hunter <br /> cc: Bob Spoor <br />