SITE INFORMATION AND CORRESPONDENCE

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MONITORING AND REPORTINOROGRAM ORDER NO. R5-2008-0149-04'P . 17 FORMER J.M. EQUIPMENT COMPANY 2 SAN JOAQUIN COUNTY The groundwater monitoring wells shall be sampled according to the schedule in Table 1 and the samples analyzed by the methods in Table 2, as follows: Table 1: Sampling$ Frequency (During Phase II of the H2O2 Injection Remediation) Well ID Frequency Constituent Suite(s) Monitoring Objective OW-2, OW-3, MW-4, Suite A—all wells MW-5, MW-9 Quazterly Treatment Zone° Suite B—all wells MW-6 and MW-8 &4mi--Annual (2" Suite A(2" &4 Q) Suite B 2ntl&41b Q Transition Zones MW-2 and MW-3 Semi-A hnual Suite A and Suite B 2 &4 Q Compliance3 MW-7 Annually 4+1 Q)7 Suite A and Suite B Backgrounds ' Well IN shown on attached Figure 1 2 Constituent suite components listed in Table 2 below 3 Wells used to monitor compliance and for the presence of breakdown/byproducts of the treatment migrating beyond the expected treatment area 4 Wells used to evaluate in-situ bioremediation progress inside the treatment zone, to gauge effectiveness of H202 injection in reducing the dissolved petroleum hydrocarbon concentrations, and to monitor potential changes in groundwater geochemistry that could be attributed to the injection of oxidizing agents 5 Well used to evaluate migration of pollutants within the treatment zone.The transition well may or may not be within the zone of influence. e Well used to develop background concentrations. 7 To be sampled prior to startup(baseline) 8 All sampling conducted following a 3-well volume purge Table 2: Analytical Methods --T— Maximum Practical Constituent Method' Quantitation Limit Frequency S (Ng/L)z Suite A TPHg GC/MS 50 BTEX, MTBE, TBA, ETBE, EPA g260B 0.50 (1.0 for total As indicated in TAME, DIPE3 xylenes) Table 1 Suite B Metals, dissolved" EPA 6010B Various As indicated in Total Chromium EPA 200.7, 200.8 10 Table 1 Hexavalent Chromium I EPA 7199 2.0 Bromide EPA 300.0 100 Bromate EPA 300.1 10 Or an equivalent EPA Method that achieves the maximum Practical Quantitation Limit. ' All concentrations between the Method Detection Limit and the Practical Quantitation Limit shall be reported as an estimated value. '-BTEX=benzene,toluene, ethylbenzene, and total xylenes.MTBE=methyl tert butyl ether,TBA=tertiary butyl alcohol, ETBE=ethyl tertiary butyl ether,TAME=tertiary amyl methyl ether,and DIPE=di-isopropyl ether. Metals include barium cadmium,calcium,total chromium,copper,lead,manganese,mercury,molybdenum, and nickel. FIELD SAMPLING 2. In addition to the above sampling and analysis, groundwater elevation, electrical conductivity, DO, ORP, pH, and water temperature will be measured in the field each time a monitoring well is sampled. The sampling and analysis of field parameters is specified in Table 3.