Laserfiche WebLink
rIl <br /> Mr Kyle Christie Project 0805-146 03 <br /> a November 28, 1995 <br /> Page 4 <br /> from 1,400 ppb in well MW-7 to 11,000 ppb in well MW-3 Trichloroethene was detected <br /> in well MW-1 at a concentration of 26 ppb and 1,2-dichloropropane was detected in well <br /> MW-6 at a concentration of 13 ppb All other HVOCs results were below laboratory <br /> detection linuts Nonpolar oil and grease were detected in well MW-2 at a concentration <br /> of 8,100 ppb, and in well MW-6 (located off site and upgradient) at a concentration of <br /> 21,700 ppb (see Table 2) As requested by SJCPHS in May 1995, HVOC analyses will be <br /> performed on a semiannual bans (during the first and third quarters of each year) <br /> Concentrations of TPHG and benzene are shown on Figure 2 <br /> ACTIVITIES PERFORMED DURING THE THIRD QUARTER <br /> • EMCON performed quarterly groundwater sampling <br /> • EMCON compiled and evaluated groundwater monitoring data <br /> • EMCON began preparation of an Interim Sort Remediation Plan (ISRP) <br /> associated with the removal of the underground storage tanks <br /> ANTICIPATED WORK <br /> o ARCO will continue to perform quarterly groundwater monitoring The next <br /> sampling event is tentatively scheduled for November 1995 Because wells <br /> MW-2 and MW-5 are located within the dissolved hydrocarbon plume and other <br /> nearby monitoring wells provide lateral definition, EMCON recommends these <br /> wells be discontinued from quarterly sampling <br /> • EMCON will collect groundwater samples that will be analyzed for TPHG and <br /> BTEX In addition, samples collected from wells MW-2 and MW-6 will be <br /> analyzed for TOG <br /> • EMCON will finalize and subrmt the ISRP to the appropriate regulatory <br /> agencies <br /> CONCLUSIONS <br /> The direction of groundwater flow during the August 15, 1995, sampling event was toward the <br /> northeast to southeast, which is generally consistent with previous sampling events Dissolved <br /> . gasoline hydrocarbons were detected in samples from all wells TOG was detected in the <br /> samples collected from wells MW-2 and MW-6 No other samples were analyzed for TOG <br /> SAC1N IP7010805V08051460 3CS-95\pas 1 <br />