Laserfiche WebLink
ti <br /> Mr Kyle Christie Project 0805-1460 003 <br /> April 27, 1995 <br /> Page 3 <br /> summarized in Tables 1 and 2 Copies of the laboratory analysis reports are presented in <br /> Attachment B <br /> Results of analyses indicated dissolved gasoline hydrocarbons were detected in samples from the <br /> six wells Concentrations of TPHG ranged from 36,000 parts per billion (ppb) in wells MW-1 and <br /> MW-2 to 180,000 ppb in well MW-5, and benzene concentrations ranged from 6,300 ppb in well <br /> MW-2 to 14,700 ppb in well MW-3 1,2-dichloroethane was detected in wells MW-5 and MW-6 <br /> at concentrations of 9 3 and 12 ppb, respectively, 1,2-dichloropropane was detected in wells <br /> MW-1, MW-2, and MW-4 through MW-6 at concentrations ranging from 0 8 to 9 4 ppb TOG <br /> was detected in wells MW-2 and MW-6 at concentrations of 8,500 and 9,900 ppb, respectively <br /> (see Table 2) Concentrations of TPHG and benzene are shown on Figure 2 <br /> ACTIVITIES PERFORMED DURING THE FIRST QUARTER <br /> • Performed quarterly groundwater sampling <br /> • Conducted an additional file search at SJCPHS and obtained aerial photograph for the <br /> subject site <br /> ANTICIPATED WORK <br /> • Prepare and submit a workplan to drill additional soil borings to assess hydrocarbons <br /> beneath the underground storage tanks <br /> • ARCO will continue to perform quarterly groundwater monitoring The next sampling <br /> event is tentatively scheduled for May 1995 <br /> • Assemble the results of the file search and aerial photograph study in a report and submit <br /> to the SJCPHS <br /> CONCLUSIONS <br /> The direction of groundwater flow was toward the southeast, which is approximately 90 degrees <br /> different from the previous sampling events The change in groundwater gradient and direction may be <br /> due to the increase in water levels (approximately 2 93 feet) Dissolved gasoline hydrocarbons were <br /> detected in samples from wells MW-1 through MW-6 HVOCs were detected in samples from all wells <br /> sampled TOG was detected in samples collected from wells MW-2 and MW-6 The highest <br /> concentration of dissolved hydrocarbons and HVOCs continues to be present in the upgradient <br /> monitoring wells <br /> SAC\N 1PJ010805108051460 3AL-941dms 1 <br />