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sr' <br /> E T <br /> CONDOR EARTH TECHNOLOGIES INC. 4Y ? O <br /> 21663 Brian Lane <br /> May 18, 1995E 2MIT/�E H P.O. Box 3905 0 <br /> /j�fSonora, CA <br /> (209)532-0361 <br /> Mr. Steve Sasson FAX (209)532-0773 ; <br /> San Joaquin County Public Health Services . <br /> Environmental Health Division <br /> 445 N. San Joaquin Street <br /> Stockton, CA 95201-0388 <br /> Subject: Addendum to Groundwater Investigation Work Plan for 1444 Lathrop Road, <br /> Lathrop, California. <br /> Dear Mr. Sasson; <br /> In a letter dated January 30, 1995, the San Joaquin County Public Health Services, <br /> Environmental Health Division (SJCPHS,EHD) approved with comments, the September 27, 1994, <br /> work plan prepared by Condor Earth Technologies, Inc., (Condor), for a groundwater investigation at <br /> the above referenced site. The location;of the Di Salvo - Lathrop site is shown in Figure 1, attached. <br /> This letter proposes to amend the approved work plan. <br /> BACKGROUND <br /> Condor's work plan outlined a phased investigation to evaluate groundwater conditions at the <br /> site. The first phase of the investigation included the collection of one grab groundwater sample near <br /> the east end of the former location of TK4 using a Hydro.punch sampling tool. The purpose of <br /> collecting the groundwater sample was to evaluate if hyd carbon contamination detected in the soil <br /> subsurface had leached into the shallow water table at the site. Recent correspondence with <br /> SJCPHS,EHD indicated that regardless of the results of the laboratory analyses of the grab <br /> groundwater sample, the installation of one monitor well ithin 10 feet and in the down gradient <br /> direction of the detected contamination source would be required. SJCPHS,EHD also stated that if <br /> laboratory analyses of the groundwater sample collected f rorn the monitor well indicate no evidence of <br /> hydrocarbon contamination at or above the reported labo tory detection limits for two consecutive <br /> quarters and the soil contamination detected at the site during over-excavation can be shown to pose <br /> no risk to human health, SJCPHS,EHD'would issue site closure at the Di Salvo - Lathrop location. <br /> ENVIRONMENTAL • GEOLOGICAL • ENGINEERING • GEOTECHNICAL <br />