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2MCM Associates <br />' 1433 North Market Boulevard • Sacramento California 95834-1943 • (916)928-3300 . Fax(916)928-3341 <br /> u <br /> September 9 1994 <br /> Project 0805-111 01 <br /> 1 <br />' M �- C- p 1 3 1994 <br /> Mr Chuck Carmel rlt� S <br />' ARCO Products Company ENVIRONMENTAL HEALTH <br /> P O Box 5811 PERMITJSE>?ViCI<S <br /> San Mateo California 94402 <br />' Re Second Quarter 1994 Status Report for ARCO Products Company Service <br /> Station No 2076 at 800 East Kettleman Lane Lodi. California <br />' Dear Mr Carmel <br />' At the request of ARCO Products Company (ARCO), EMCON Associates (EMCON) is <br /> conducting an environmental investigation at the subject site (see Figure 1) We have <br /> prepared this status report on the work conducted during the second quarter 1994 <br /> GROUNDWATER MONITORING: SECOND QUARTER 1994 <br />' Groundwater Technology, Inc , (GTT) of Concord, California, was contracted by ARCO <br /> to monitor the groundwater in the monitoring wells previously installed at the site, GTI <br /> subsequently forwarded their field notes and the laboratory reports to EMCON EMCON <br />' used these data to evaluate dissolved gasoline hydrocarbon concentrations and the flow <br /> direction and groundwater gradient <br />' On June 24 1994, a technician from GTI took water level measurements and collected <br /> groundwater samples from monitoring wells MWA through MW-4 tar subjective and <br /> laboratory analyses The technician did not observe floating product or product sheen on <br />' tramples collected from the wells (see Table 1) <br /> The -surveyed elevations of the top of casing and the depth-to-groundwater measurements <br />' (-summarized in Table 1) were used to evaluate the potentiometric surface beneath the site <br /> On June 24, 1994, the direction of groundwater flow was north to northwest with a <br />' gradient of approximately 0 01 (see Figure 2) The direction of groundwater flow is <br /> consistent with previous sampling event~ <br />' Groundwater samples from each well were analyzed for total petroleum hydrocarbons as <br /> ga-sohne (TPHG) and benzene toluene ethylbenzene and total xylene isomer,. (BTEX) <br /> -sAC 1pj(N)X05\DX05I 110 ibm 94 m1m 5 <br />