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RIO/71-51-1C 4 3 GRO NDWATER SAMPLING METH DS AND WELL ONSTRUCTI N 1 Drilling and decontamination procedures described in Section 4 2 were followed in the drilling of the six monitoring wells All monitoring wells were completed according to California State Bulletin 74-88 Monitoring Well Standards Monitoring well construction 1 specifications are summarized in Table 4 (See Appendix C) Monitoring well diagrams (Figures 3 through 8) are presented in Appendix F All wells are 4-inch PVC monitoring wells ' The new wells were developed p and purged prior to sampling using a Grunfos submersible pump Existing wells MW7, MW10, MW11 and MW12 were purged earlier by hand bailing ' All new wells were purged of at least three casing volumes of water prior to sampling MW-7, MWA, MWB and MWC dried up during purging and were allowed to recharge completely prior to sampling Tables 5A and 58 (see Appendix C) summarize the well purging operation Water samples from each well were obtained utilizing a Teflon bailer properly ' decontaminated with TSP solution and deiornzed water to prevent cross-contamination Sample bottles were filled with specimen which were preserved according to EPA- approved procedures as described in Section 4 4 below ' 44 SAMPLE CONTAINERS PRESERVATION PACKAGING AND SHIPMENT Table 6 (see Appendix C) summarizes the sample containers utilized, preservation techniques and the observed holding time requirements All samples were shipped to the laboratory within 48 hours from the time of collection ' Following sampling, the exterior of sample bottles were cleaned by wiping the outer surface with a moist cloth In preparation for shipment, the following procedures were done ' o Checking the samples to make sure that these preserved when preservation is necessary Bottle caps were tightened well and liquid 1 levels were marked if sample bottles were partially filled o Placing each container in resealable plastic bags, ensuring that labels are readable 14