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07/29/93 09:18 B8U WASTE SCIENCE AND TECHNOLOGY 002 <br /> A, Plecament and UtrdonEle for Caroundt Renu Sempling <br /> Loctdons <br /> The proposed eight HydroPunch Er sampling locations and the two monitoring <br /> well locations are shown on Figure 4-1. The pmvious investigations detected <br /> petroleum hydrocarbon constituents In only MW-I. No detectable levels of potroleurn <br /> hydrocarbons were found in the surrounding wells, MW-4, MW-5, 1VM-6, and <br /> MW-7. <br /> BVWST will collect HydroPunch Er samples to assist in defining the extent of <br /> the contamirMt plume and to determine the validity of the previous investigation <br /> results, especially the results from MW-1, the only wail showing contamination. The <br /> results of the HydroPunch IC samples will indicate whither the data previously <br /> collected from MW-1 are valid, whether a contaminant plunte exists, and the extent of, <br /> the contaminant plume, Initially, duee HydroPanch W samples (Hf'1, HP-2, and <br /> HP-3) will be collected, as shown in Figure 4-1. One of the following three scenarios <br /> `-' will theft occur: <br /> o if no petroleum hyd=arbons are detected in these samples, three <br /> additional HydroPunch U* samples (HP-4, HP-5, and 11P-6) will be <br /> collected, as shown 1n Figure 4-1. If psltraleum hydrocarbons are <br /> detected in HP-4, HP-5, or RP-6, thea/MW-1 will be assumed to be valid <br /> and two monitoring wells will be installed, as shown on Figure 4-1. <br /> O if no petroleum hydrocarbons are detected in $P-1, HP-2, or HP-3, then <br /> HP-4, HP-S, and HP-6 will be installed. If 110 petroleum hydrocarbons <br /> are detected in HP-4,HF-5, or HF-6, then out monitoring well will be <br /> installed adjacent to MW-1. If the sampim from tho newly installed well <br /> do trot contain petroleum hydrocatbons•in exc: a of detection limits, then <br /> Mw-1 will be considered invalid and a Case II closure will be,pursued. <br /> J <br /> o If petroleum hydMMrhans are detected in lip-j, HP-2, or HP-3, then <br /> � HP-4, HP 5, and IIP-6 will not be collected. Two monitoring wells will <br /> then be installed, as shown on Figura 4-1. <br /> in either case, in addition to the HydroPunc h Ir sarn Ales surrounding MW-1, <br /> two HydroPunch ll` samples have bean proposed near the former UST locations to <br /> J <br /> 931122 Last D47 Muftidpai Utility Dkiria <br /> 4042 AMvp 14 wai*rind-suet►fuse Contac <br /> J <br /> J <br />