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1211slu5 ill:UL rA3 aAb Jbi UOV4 aimmno oc muu^ <br /> San Joaquin County Public Health Service <br /> Environmental Health Division <br /> December 15, 1995 <br /> Page 2 <br /> i Evaluate groundwater quality for total petroleum hydrocarbons as diesel (TPH-d) <br /> in groundwater samples in the vicinity of the former underground storage tanks; <br /> and <br /> • Analyze soil samples for TPH-d following the five-year groundwater monitoring <br /> .program to evaluate the rate of natural biodegradation of TPH-d in soils at this <br /> site. <br /> The duration of this proposed monitoring program is five years. At the conclusion of the <br /> program, assuming results are consistent with conclusions reached.to date, you indicated that <br /> final closure of the tanks would be approved. The frequency of each type of analysis is <br /> summarized in the table helow. <br /> Summary of Proposed Monitoring Program <br /> Total No. <br /> No . Sanililles <br /> Monitoring Activity Media Analyte frequiency Locations l5 years) <br /> Groundwater Level Groundwater Water level (ft} Semi.Annval(July 5!'! 50 <br /> and Janumy,1996 <br /> to 2801) <br /> GroundweteT Sampling and Groundwater TPH-d (Method Annually(July 1898 5�'t 25 <br /> A i $is 8015M) to 2001) <br /> $uii Monitoring Sag TFH-d(Method One Time (July 210 <br /> 801 5M) 2001) <br /> (11 Locailaas of the fire monitoring melt are shoutn in Figure 1. <br /> (21 Locations for the two soil harings will he adlacert to S&19 and S&ZD;son samples wn!be collected fmm 20,25.30."351 and 40 feet below <br /> Sound wrlace. <br /> This testing program is appropriate for the stated objectives and was developed from previous <br /> investigation and monitoring work at the site, including the most recent analyses of soil and <br /> groundwater samples reported in.the Evaluation of Hydrocarbon Mobility (Dames.& Moore, <br /> 1995). <br /> Methods <br /> Groundwater measurements and soil sampling will be conducted using the methods described <br /> in the Work Plan for Additional Soil Sampling and Monitoring Well Installation (Dames & <br /> snC180.02 <br />