Laserfiche WebLink
JO • • <br /> C A M B R I A <br /> Gregg Drilling and Testing, Inc, of Martinez, California cut off the well cap and replaced it with <br /> a removable cap Cambria collected a grab groundwater sample from the well on the same day <br /> and submitted the sample to the laboratory for analysis Additionally, Blaine purged and <br /> sampled the well on June 5, 2001 during the quarterly monitoring and sampling event Blaine <br /> measured the total depth of the well and found it to be 115 feet deep This date is shown on <br /> Blaine's field sheets (Appendix A) A cement surface seal was visible below the top of the well <br /> casing This seal was approximately 24-inches in diameter and appeared to be in good condition <br /> We were not able to determine any other well construction details for this well Based on <br /> information in Shell's files it appears this water well was taken out of service in 1974 when the <br /> station was hooked up to the city water supply <br /> Both groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), <br /> benzene, toluene, ethylbenzene, xylenes (BTEX), fuel oxygenates and lead scavengers The <br /> laboratory analytical results are included in Appendix A and B The laboratory analytical <br /> findings are summarized below <br /> The grab groundwater sample contained only 0 61 parts per billion (ppb) of toluene The <br /> groundwater sample Blaine collected after purging the well contained 73 ppb TPHg, 10 ppb <br /> benzene, 2 1 ppb toluene, 0 71 ppb ethylbenzene, and 5 6 ppb xylenes No fuel oxygenates or <br /> lead scavengers were detected in the sample <br /> ANTICIPATED THIRD QUARTER 2001 ACTIVITIES <br /> Groundwater Monitoring Blaine will gauge and sample the site wells according to the existing <br /> sampling schedule and tabulate the data Cambria will prepare a groundwater monitoring report <br /> Groundwater Remediation GWE will continue on a twice-monthly basis <br /> Onsite Abandoned Water Well As proposed below, Cambria would like to properly destroy the <br /> water well at this site We will proceed with well destruction once we have received approval <br /> from SJCPHS <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> The MTBE concentration was lower in all of the wells this quarter compared to recent levels <br /> The decrease may be attributable to the GWE program, but additional monitoring may be needed <br /> 0813 2 <br />