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i I ' Mr Chuck Carmel Project 0805-11101 September 9, 1994 I Page 2 I ' Concord, California The results of these analyses are summarized in Table 1 Copies of the laboratory analysis reports are Attachment A j ' Results of analyses indicated TPHG concentrations were detected in groundwater samples collected from wells MW-1, and MW-5 at concentrations ranging from 75 parts per billion ([ppb] well MW-1) to 9,200 ppb (well MW-5) Benzene concentrations ranged ' from 0 5 ppb (well MW-3) to 1,100 ppb (well MW-5) TPHG and BTEX were not detected in wells MW-2, MW-4 and MW-6 Concentrations of benzene and TPHG are j %hown on Figure 1 i I WORK IN PROGRESS An addendum to the Fourth Quarter Status/ Problem Assessment Report was submitted ' during August 1994 The addendum was prepared in response to a letter from the San Joaquin County Public Health Services, dated June 24, 1994, and presented information ' that was not included in the problem assessment report ARCO will continue quarterly monitoring The next sampling event is tentatively scheduled for the month of September 1994 CONCLUSIONS The groundwater flow direction has been consistently toward the east to southeast Dissolved gasoline hydrocarbon% were detected in groundwater samples collected from monitoring wells MW-1, MW-3 and MW-5 but were not detected in wells MW-2, MW-4 and MW-6 Based on data collected to date, 1t 1% our opinion that the some data collected during first quarter 1994 is anomalou% Results of second quarter ,ainpling event are ' consistent with data gathered prior to the first quarter 1994 DOCUMENT DISTRIBUTION Ms Mary Meays San Joaquin Public Health Services I P O Box 2009 Stockton, California 95201 I Ms Elizabeth Thayer California Regional Water Quality Control Board Central Valley Region ' 3443 Routier Road, Sacramento California 95827-3098 tiA(.lpj1N)805\f18051110 1-kni-94 p1ti 5 I