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10 July 2017 Advanced(3cto AGE Proposal No. 16-7172 Page 2 of 5 r . Currently the most up-gradient or southern shallow groundwater monitoring well (W-1 R) is not located near any proposed or operating discharge area and is no longer required or a reasonable representation of background near the waste discharge areas. This area (Site A) is proposed for exclusion from the WDR and sale to a third party. Additionally: Well W-2 and W-7 are located up-gradient of the parcel location Site C and lawn areas, which have been or will be receiving wastewater discharges and is representative of the background water quality in practical relation to the remaining discharge areas. BAI — INVESTIGATION FINDINGS In 2017, Brusca Associates Inc. (BAI) established soil borings (Figure 2 BAI — Site Plan) across the land application area for evaluation of potential soil impact from wastewater discharge. Boring 131 was within the former waste glass management area, boring B2, B3, B4 and B5 were within the land application area and shallow surface samples S1 to S4 were collected apparently collected within six inches of the surface. Four surface samples (S1 to S4), five surface samples from boring B1 to B5, with seven samples ranging from two (2)feet below surface grade to eight (8)feet bsg were analyzed for petroleum, PCBs, VOCs, and CAM 17 Metals. Five (5) surface soil sample detected motor oil range compounds from concentrations of 12 mg/kg to 39 mg/kg. The detections were random and not indicating a source or impacted area. PCBs were detected in three (3) surface samples and one other sample at four(4)feet bsg at a maximum concentration of 0.081 mg/kg (61-4). Metals were detected at concentrations which are representative of background or nominal concentrations, for an industrial property. PROPOSED SCOPE OF WORK At the direction of the RWQCB, shallow and intermediately deeper soil samples are to be collected at a minimum of three (3) intervals, from the native soil to evaluate the potential impact of wastewater discharge to land prior to removal of the Site A from the WDR. AGE proposes to advance a total of eight (8) soil borings to evaluate the presence and define the type or extent of petroleum hydrocarbon, metals-impacted or wastewater production waste (byproducts) chemicals. As the evaluation for site conditions the scope of work required that background soil samples should be collected in the area of Site B, northeast of the former discharge area proposed for permit termination. Proposed soil boring locations are depicted in Figure 2.