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Mr . Fran Forkas <br /> January 13, 1989 <br /> Page 3 <br /> on Table 2 . It is particularly evident during the period that <br /> well 20-16B was monitored. The westerly hydraulic gradient <br /> evident in Table 2 may be a localized effect of the pits to <br /> the west of the plant from which soil was excavated for <br /> construction of Route 5 . <br /> Figure 3 is a site plan of the treatment plant facilities . <br /> Shown on the figure are the proposed locations of the <br /> monitoring wells . <br /> MONITORING WELLS <br /> A minimum of four wells are required for groundwater <br /> monitoring. <br /> One well is required for sampling upgradient, or <br /> background, water quality and three are required downgradient <br /> for water quality at the points of compliance. The <br /> recommended locations for these wells are shown on Figure 3 . <br /> wells WSMO1 would beuseWSM04 wabeguseddtoater monitorptheg and <br /> Wells WSM02 throughouldd <br /> downgradient groundwater quality. <br /> ul <br /> Well WSMO1 is to be located at the northern boundary of the <br /> City property. In their letter of April 16, 1986, The <br /> Regional Water Quality Control Board cautioned that the <br /> upgradient well had to be located gatedaareasetoate establishn�al <br /> distance from the ponds an <br /> background water quality. While the mounding effect may <br /> cause localized northerly groundwater move menwellhatpthe anorth <br /> direction is southerly. With the monitoring <br /> property line, the groundwater data is most likely to be <br /> z ality. <br /> representative of the background qu <br /> The monitoring wells should be constructed to a depth of 20 <br /> feet. The DWR well data indicate <br /> sidethat <br /> aboutwater <br /> l0efeet below range from <br /> near the surface on the no <br /> grade on the south side. Well WSMO1 uldAbethoSapointtthethe <br /> side of the access drive near entry gate. <br /> entry road slopes down to the field from the frontage road. <br /> Constructing the well as close ai duringcal th <br /> thewetseasonewould <br /> but <br /> allow for easy access to the equipment, and the top of the casing <br /> out of the way of field equip <br /> would be about 7 feet above seasonal high water level . <br /> Appendix C provides a general description of the construction <br /> requirements for the monitoring wells. The monitoring <br /> wells <br /> should be constructed of 2-inch diameter PVC pipe to <br /> facilitate the use of commonly available sampling equipment. <br />