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12/06/00 WED 17:40 FAX 916 38802 DAMES & MOORE SAC • Z014 DD7C-Tracy OU 1 Groundwater Treatment for Pesticides,Pump Test Work Plan 2.4 Observation Piezometer Plan. Each wastewater sample should be Abandonment analyzed for the following: 2.4.1 Upon completion of the aquifer tests,the • PH; temporary observation piezometers will be abandoned. Abandonment should be performed • Halogenated organics using Method 8021; according to the general procedures described in the Comprehensive Field Work Plan. All • Semivolatile organic compounds(SVOCs), abandonment procedures will be performed in accordance with federal, state,and county • Organochlorine pesticides; regulations in order to assure that the quality of the groundwater is protected and possible • Total threshold limits metals by Methods physical hazards to humans is eliminated. 6010 and the 7000 series;and 2.4.2 As the casing is pulled out of the ground, • Toxicity characteristic leaching potential grout will be injected to fill the boring. In the (TCLP) (metals, pesticides, herbicides, event that the casing breaks or the soil has SVOCs,volatile organic compounds). collapsed around the casing,preventing it from being pulled out,the boring will be drilled out 2.5.3 Proper disposal of IDW will be using hollow stem auger techniques and determined based upon analytical results. All backfilled with grout. IDW will be disposed of in accordance with federal and state regulations as outlined in the 2.4.3 The grout will be a bentonite-cement Comprehensive Field Work Plan, mixture using procedures required under the California Administrative Rules of Water Well 3.0 BASELINE BUDGET Drillers and Article 56 of EPA 57019-75-0001. The baseline budget,by task is shown in Table 3-1. 2.5 Investigation Derived Waste 4.0 BASELINE SCHEDULE 2.5,1 Groundwater removed during the pumping tests will be temporarily stored in an The baseline schedule is shown in Appendix A. approved storage tank(such as a Baker tank). 5,0 REFERENCES The container will be labeled with a permanent, non-fading and weatherproof label and shall include the following information: Neuman, S.P. 1975 Analysts of Pumping Test Data from Anisotropic Unconfined Aquifers • Well or boring identification; Considering Delayed Yield Gravity Response. Water Resources Research, v. 11,pp. 329—342 • Date; Radian International,2000 Comprehensive Field • Type of material(purge water, etc.); and Work Plan Draft(Version 3), September. • Name, organization and telephone number Radian International, 1999 OU I Groundwater of person knowledgeable of investigation Treatment for Pesticides, Pre-Design Technical derived waste(IDW)collection. Summary Final October. 2,5.2 Sampling of the IDW will be performed in order to characterize the waste and determine the proper means of disposal. Sampling procedures are outlined in the Comprehensive Field Work OU-1 Pimp Test WP 7 Nwcmber 2000