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E 95 6 23 <br /> P <br /> T 1: 32 <br /> CONDOR EARTH TECHNOLOGIES INC. <br /> 1125 No. Golden State Blvd. 21663 Brian Lane <br /> February 21, 1995 Suite H P.O. Sox 3905 <br /> P.O. Box 3448 Sonora, CA 95370 <br /> Turlock, CA 95381 (209)532.0361 <br /> (209)668-9234 FAX(209)532-0773 <br /> Mr. Steve Sasson FAX(209)668-9248 <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,EI-ID) approved, with comments, the work plan prepared by <br /> Condor Earth Technologies, Inc., (Condor), dated September 27, 1994, for a groundwater investigation <br /> at the above referenced site. This letter presents Condors response to SJCPHS,EHD comments to <br /> perform a groundwater investigation at the site and to change the proposed soil analytical method for <br /> total petroleum hydrocarbons as diesel (TPI -d). <br /> E, <br /> GROUNDWATER INVESTIGATION <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 Hydr punch sampling tool. The purpose of the <br /> grab water sample was to confirm the presence of hydrocarbon contamination in the groundwater prior <br /> to the installation of monitor wells. The second phase o investigation, based on the results of phase <br /> one; included tl�e installation of°thi`ee monitor wells. SJ PHS,EHD requires that;based on Sari �- <br /> Joaquin County Flood Control Maps indicating a depth to groundwater at the site as shallow as 10 feet <br /> below ground surface, monitor wells be installed at the site. <br /> San Joaquin County flood control maps indicate that the general groundwater flow direction at <br /> the Di Salvo Trucking site is-toward the southwest. Bas d on the flow direction from the flood <br /> control maps, Condor proposed in the,Work Plan, dated September 27, 1994, a triangular pattern of <br /> monitor wells with one well in the anticipated downgrad ent direction from soil contamination detected <br /> near the east and of the former location of TK4. At least one of the three proposed monitor wells is <br /> within 10 feet of the former tank pit, as requested by SJ PHS,EHD. <br /> ANALYTICAL NMTHODS € - <br /> SJCPHS,BHD indicated that soil samples collected from the site are to be analyzed for Total <br /> Petroleum Hydrocarbons as diesel (TPH-d) by EPA Method 8015. EPA Method 8015 utilizes a purge <br /> ENVIRONMENTAL • GEOLOGICAL • ENGINEERING • GEOTECHNICAL <br /> E'. <br />