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I <br /> SNA WATERWORK CORP. <br /> INDUSTRIES <br /> May 8, 1991 'Y;� j <br /> MAY 9 <br /> MS. Laurie A. Cotulla � fR��°I��9�=N� AL HEALTH <br /> San Joaquin County Public Health Servi PU MIT15cRViC[_'S <br /> Environmental Health Division <br /> P.O. Box 2009 , <br /> Stockton, CA 95201 <br /> Re: CLOSURE RECOMMENDATION: Genstar-Western Stone <br /> Products, 8181 W. "11th" St. , Tracy, CA (County <br /> site code 1393) <br /> Dear Ms. Coi,ulla: R, <br /> I am writing in response to your letter of April 12, 1991 re- <br /> questing additional subsurface investigation at the referenced <br /> site. <br /> if <br /> Based on the results of soil and groundwater sampling and analy- <br /> sis during tank removal, during the drilling of four groundwater <br /> ' <br /> monitoring wells and over a one and one half <br /> 9 � year period of <br /> monitoring and sampling, we have concluded that this site meets <br /> the established criteria for closure. Accordingly we must recom- <br /> mend against acting on your directives to excavate soils and <br /> install additional monitoring wells. <br /> I <br /> Please allow me to briefly address the specific points made in <br /> your letter: <br /> 1) "Based on soil sample results obtained during the drilling of <br /> monitoring well #4 and the depth to groundwater ( 12 feet) the <br /> contaminated soil in the former location of tank #3 cannot be <br /> left in place. Submit a soil remediation plan by May 15, 1991. " <br /> As reported in our letter of June 22, 1990, the soil sample <br /> collected and analyzed from monitoring well #4 (WS-SB-4) was from <br /> a depth of 5. 5 feet below grade. Groundwater was found in this <br /> well at a depth of 6 feet below grade. The hydrocarbons detected <br /> in this soil sample, capillary P arY 9 therefore represent il�. fringe con- <br /> tamination. The levels of petroleum hydrocarbon cotstituents <br /> detected in this sample (Table 1, attached) can only be cYstdc- <br /> teri.zed as minimal., ie: TPHD s 2. 5 ppm, benzene = .0058 ppm, <br /> ethylbenzene - .0067 ppm, and xylenes = 0076 ppm. Toluene. was <br /> not detected in the sample. Moreover, the soil sample collected <br /> from beneath tank #3 during removal did not contain detectable <br /> concentrations of any analytes. <br /> 1710 MAIN STREET . ESCAL.ON, CA 95320 • (209)838-3507 <br /> 2350-A WALSH AVENUE . SANTA CLARA,CA 95051 . (408)496-1249 <br />