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I <br /> Ms. Yvonne Miller 18 February 2009 <br /> A R and M E Glover Trs Page 2 of 2 <br /> Re: 7675 W. Eleventh Street <br /> The EHD notes that the soil samples collected at or approximately at 10 feet bsg from five <br /> of the six borings and the associated grab groundwater samples were moderately to <br /> intense) impacted p acte <br /> d by petroleum hydrocarbons. The distribution of impacted soil is <br /> suggestive of migration of free product toward the north-northwest, in agreement with the <br /> inferred predominant. groundwater flow direction. The locally intense impact to <br /> groundwater implied by the grab groundwater samples is not confirmed by the data from <br /> the monitoring wells in the immediate area, such as MW-4, MW-5 and MW-7. The EHD <br /> interprets the grab verses monitoring well sample data to show that the impacted capillary <br /> fringe soil is not in turn impacting groundwater significantly. The EHD suspects that the <br /> impact to the grab groundwater samples from GP-4 through GP-8 was an artifact of the <br /> soil and groundwater sampling method. The EHD does not require any additional site <br /> characterization as a result of the September 2007 investigation at this time. <br /> The EHD notes that monitoring wells MW-1, MW-5 and MW-8 are currently,being sampled <br /> annually, the others quarterly. At this time the EHD approves sampling MW-1, MW-4, <br /> MW-5, MW-6, MW-7 and MW-8 annually and sampling MW-2 and MW-3 semi-annually. <br /> Analyze all samples for methyl tert-butyl rether (MTBE); in addition to MTBE, analyze <br /> samples from MW-2 and MW-3 for total petroleum hydrocarbons quantified as gasoline <br /> (TPH-g) and for benzene, toluene, ethylbenzene and total xylenes. <br /> Submit the feasibility study to the EHD by 01 June 2009. Questions and comments may <br /> be addressed to Nuel Henderson at (209) 468-3436. <br /> Sincerely, <br /> a�Laaor <br /> Marga C. Henderson, Jr. PG io, R S <br /> Engineering Geologist Program Coordinator <br /> Copy: James Barton, CVRWQCB, 11020 Sun Center Dr. #200, Rancho Cordova, CA 95670 <br /> Todd Hafner, ATC, 1117 Lone Pine Avenue, Ste B, Modesto, CA 96361 <br /> I <br /> Directive Letter 0209 <br />