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Mr Kyle Christie Project 0x05-,114 04 <br /> May 15, 1995 <br /> Page 2 <br /> During October 1993, RESNA Industries (RESNA) of Rancho Cordova, California, <br /> observed Triangle, Inc , of Sacramento, California, excavate trenches and install horizontal <br /> piping for use during site remediation <br /> In June 1994, RESNA prepared and subnutted a problem assessment report and a final <br /> remediation plan to the county and state regulatory agencies The reports indicated that <br /> additional subsurface investigation is required and will include additional air sparge wells, a <br /> monitoring air sparge well, vapor extraction wells, and one additional off-site monitoring <br /> well <br /> During the fourth quarter 1994, EMCON submitted access agreements to the property <br /> owner north of the site to install one monitoring well The well is necessary to fully <br /> delineate hydrocarbons in groundwater AN of March 31, 1995, an access agreement from <br /> the property owner north of the site has not been obtained <br /> GROUNDWATER MONITORING. FIRST QUARTER 1995 <br /> EMCON was contracted by ARCO to conduct the field work at the site Field work included <br /> pleasuring depths to water and collecting groundwater samples for subjective and laboratory <br /> analyses EMCON used these data to evaluate the direction and gradient of groundwater flow <br /> beneath the site ✓ <br /> On February 28, 1995, a technician from EMCON measured depths to water and collected <br /> groundwater samples from wells MW-1 through MW-8 and MW-10 for subjective and <br /> laboratory analyses Floating product or product sheen was not noted in samples from the <br /> wells (see Table 1) <br /> The wellhead elevations of the monitonna wells at the site were previously surveyed by <br /> Morrow Surveying of West Sacramento California The surveyed elevations and the depth <br /> to groundwater measurements, summarized in Table 1, were used to evaluate the <br /> potentiometric4mith <br /> beneath the site The groan r flow direction on February 28, <br /> 1995, was to a hydraulic gradient CU0 002 ee Figure 3) The groundwater <br /> flow direction in the past has generally been towards the east to southeast Groundwater <br /> elevation data are presented on Figure 3 and in Table 1 Groundwater elevations increased <br /> 2 65 feet from the previous sampling event performed in December 1994 <br /> SA(\N pjoWO"hOS 1140 4bs-95 pas 5 <br />