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RESNA <br /> yV ATER vV ORK CORP. <br /> INDUSTRIES <br /> May 8, 1991 <br /> Ms. Laurie A. Cotulla <br /> MAY <br /> San Joaquin County Public Health Servi fIC(.)h!`;1(.rV ��� HP TId <br /> Environmental Health Division f'r C;147i t,'S� RO(:i 5 <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 /> i <br /> Dear Ms. Cotulla: <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 /> Based on the results of soil and groundwater sampling and analy- <br /> sis during tank removal, during the drilling of four groundwater <br /> monitoring wells, and over a one and one half <br /> �- =1 monitoring and sem lin , year period of <br /> mend meets <br /> the established criteria for closure. Accordingly wes usterecom- <br /> gainst acting on your directives to excavate soils sand <br /> install additional monitoring wells. <br /> Please allow me to briefly address the specific 1' <br /> Your letter: Points made in <br /> 1) "Based on soil sample results obtained during the drilling of <br /> monitoring well #4 and the depth toroue <br /> g dwat <br /> contaminated soil in the former location of tank(#3 cannotthe 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 sail sample <br /> collected and analyzed from monitoring well #4 (WS-SB-4) was from <br /> a depth of 5.5 feet below grade. <br /> Groundwater <br /> ater was found in thiswell at a depth of 6 feet below grade. The <br /> hydrocarbons <br /> in this soil sample, therefore, represent capillary frigeected con- <br /> tamination. The levej`s .o.t pet o eum ri resoasrbtin consttuents <br /> detected in this sample (Table 11F attached) can only be' q�d a 1114,01m&ll . ke.,, .TPHD. = 2 5' pPm..� benzene'. _ ..005$ ppm, <br /> ethyXbeEieY}�c °. OOb.7 ppm., and k3*lbtij8 _ ....0`075 .PAm. oluei�` was <br /> not etb''�ed„ in the sample, Moreover, the soil sample collected <br /> from hertath tans #3 during removal did not contain detectable <br /> concentrations of any analytes. <br /> ?5 1710 MAIN STREET • ESCALON,CA 95320 • (209) 838-3507 <br /> Y! 2350•A WALSH AVENUE SANTA CLARA,CA 95051 • (408)496-1249 t <br />