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T. <br /> E <br /> PUBLYC HEALTH SER ICES <br /> -G <br /> SAN JOAQUIN COUNTY Q <br /> N: a <br /> JOGI KHANNA M.D.,M.P.H. <br /> Heakh Officer <br /> P.O. Box 2009 • (1641 East Hazelton Avenue) • Stockton, California 95201 <br /> (209) 468-3400 <br /> CHUCK NICHOLS <br /> USA PETROLEUM CORPORATION <br /> P O BOX 1839 AUG 19 1992. <br /> SANTA MONICA CA 90406 <br />{ RE: USA Petroleum Station #65 STTE CODE: 1356 <br /> i 2500 W. Lodi Avenue <br /> i Lodi, CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed ; <br /> the review of the "Quarterly Monitoring Report" dated February 20, 1992, submitted by Western Geo- <br /> i <br /> Engineers and has the following comments. <br /> The results from the latest round of groundwater sampling appear to be inconsistent with the field <br /> observations noted by the sampling technician. The volume of water purged from the wells prior to the <br /> sampling was not the minimum of three to five well volumes as recommended in the LUFT manual. <br /> Additionally, PHS/EHD was not notified of the groundwater sampling event and therefore not able to <br /> observe and verify that proper purging,sampling and handling methods were used to obtain and store the <br />} samples. <br /> For all future sampling activities at the site, please provide at least 48 hours advance notification to <br /> PHSIEHD so that a representative from this office can be present. <br /> The data presented in the report indicates that the groundwater contaminant plume is migrating off-site. <br /> The monitoring wells currently being used to monitor the areal extent of the plume are not providing <br /> sufficient data representative of the actual groundwater contaminant distribution and migration. If the <br /> monitoring wells located at the perimeter of the plume are too far removed to effectively monitor the <br /> contaminant distribution and the migration rate of the plume, then additional monitoring wells, located <br /> t be installed. Also an additional groundwater monitoring point needs <br /> closer in to the plume, may need o g g <br /> to be installed in the area of monitoring wells S-1 and S-2, which are now dry. <br /> Please submit a workplan for the installation of additional monitoring wells to PHS/EHD by September <br /> 21, 1992. <br /> r In addition, by September 21, 1992, monitoring well 4; which has been paved over, must be found and <br /> either restored to operating condition or properly destroyed under permit from this office. If monitoring <br /> well 4 is destroyed, another well will have to be drilled to take it's place in order to effectively monitor the <br /> groundwater, as stated above. j <br /> PHS/EHD has stated, in a letter from this office to USA Petroleum dated October 21, 1991, that the <br /> documented soil contamination at this site has been shown to impact the groundwater and will continue to <br /> do so unless remediated. PHS/EHD, in the same letter, requested that a Corrective Action Plan for this <br /> site be submitted to PHS/EHD by January 15, 1992. PHS/EHD has not yet received a Corrective Action <br /> Plan for this site. It is essential to proceed with the cleanup efforts at this site in a timely manner, <br /> especially since the data has indicated the off-site migration of contaminants. In these cases, the initiation <br /> of some form of hydraulic control over the migrating plume may be warranted. Please submit a <br /> Corrective Action Plan to this office by October 5, 1992. <br /> ' * 9 <br /> A Division of'an Joaquin County Health Carr Services �� <br />