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' Monitarin Well Construction <br /> On August 14 and 15, 1995, three soil borings (MW-4, MW-5 and MW-6) were completed as <br /> groundwater monitoring wells (Figure 2) The work was performed by Spectrum Well <br /> ' construction materials consisted of 4-inch inside diameter PVC well screen and casing A 0 010- <br /> inch well screen slot and #2112 mesh sand pack were used The wells were screened from 20 <br /> ' to 40 feet bgs A bentonite clay plug and neat cement were used to seal the wells in accordance <br /> with California Well Standards (December 1981) To protect the integrity of the wells, a <br /> ' locking water-tight well plug box was installed on each well, and a water-tight wellhead labeled <br /> "monitoring well" was concreted over each well Construction details are shown on the well <br /> ' logs provided in Appendix I and field notes are contained in Appendix II <br /> Groundwater Monitoring and.Samlling <br /> ' On August 16 1995 the relative elevation _ <br /> g o of the taps of the wellheads for wells MW 4, MW-5 <br /> and MW-6 were surveyed and tied into existing wells MW-1, MW-2, and MW-3 The depth <br /> to water was measured in all wells to determine the direction and magnitude of groundwater flow <br /> beneath the site and groundwater samples were collected to evaluate water quality Prior to the <br /> collection of groundwater samples, a minimum of three well volumes (casing and sandpack) <br /> ' were purged Temperature, pH, water elevation and electric conductivity were measured and <br /> allowed to stabilize before groundwater samples were collected using disposable bailers, one <br /> ' dedicated to each well Groundwater samples were submitted using chain of custody <br /> documentation to Argon Laboratories for analysis of TPHg and BTEX Purge water was stored <br /> ' in 55-gallon drums approved for hazardous liquid storage pending laboratory analysis <br /> ' Groundwater monitoring data are contained in Table 2 and analytical results for groundwater <br /> samples are contained in Table 3 Copies of chain-of-custody documentation and laboratory <br /> ' results are contained in Appendix III, and copies of monitoring data sheets are contained in <br /> Appendix IV <br /> W \3$007s\R&P0RTSIPAR 4 <br /> 1 <br />