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GRECE ISE NOV 1 1989 ENVIRONMENTAL HEALTH GeolDgicafTechnics Inc. PERMIT/SERVICES 21501!RjMr cimnmc+italcoruriki�g gprctafhu Modu to,CA 5B.ri (209)SM-780'r October 18,1989 f.: Rtiuert J,Burick Granite Construction Company Heavy G-Instruction Division Box 699 Watsonville, CA 95077 � RE: BC&D Properties located at 1129 W.Eleventh Street,Tracy,California 95330 tl Addendum to Work flan dated 3 October 1988 Dear Mr.Buric1c ..f Tn response to the reque;, :y BC&D Properties owners,Geological Technics has performed some interim monitoring of the 3 wells on the BC&D propert)r in Tracy. It was mutually felt that, since the regulatory agents were delaying their review of the Problem Assessment Work Plan submitted in November of 1988,it would be advantageaus to monitor the site for ground water gradients and contamination distribution. The following discussion summarizes our activities and the nformation we gathered and makes recommendation for future action. Interim Monitoring On 19 June 1989 two of the i.ionitoring wells(MW-1&3)were developed and sampled. The other monitor;ng well,MW-2,was developed and sampled on 28 June 1989. This well was covered with road gravel and had to ire located by using a metal detector. laboratory analytical data is attached. The results of the testing showed that all three wells were void of petroleum hydrocarbons. Water levels were measured in each well and the well tops were resurveyed to establish a common plane between the three points. Water gradient was calculated four different tames this summer,each about one month apart(28 June,19 July,22 August,and 12 Octol,er 1989). Water depth measurements were taker,in all three wells within a one hour interval. This information is shown in the attached figrres. On three of the four measuring dates gradient ibearing was to the southwest,which is consistent with the flow direction measured in 1987. i w t, ----------- 'I.