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1 <br /> 9MCOn Associates <br />' 1433 North Market Bou#evard + Sacramento California 95834-1943 . (916)928-3300. Fox(916)928-3341 <br /> f <br /> September 9 1994 <br /> Project 0805-111.01 <br /> Mr Chuck Carmel <br /> ARCO Products Company <br /> P O Box 5811 <br /> San Mateo, California 94402 <br /> Re Second Quarter 1994 Status Report for ARCO Service Station No 0548 at <br /> 1612 Hammer Lane, Stockton, California <br /> Dear Mr Carmel <br />' At the request of ARCO Products Company (ARCO), EMCON ASSaWates. (EMCON) is <br /> conducting an environmental investigation at the subject site (tree 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, , (GTI) Concord, California, was contracted by ARCO to <br /> conduct the field work at the site, GTI subsequently forwarded their field notes and the <br /> laboratory reports to EMCON Field work included measuring depths to water and <br /> collecting groundwater samples for subjective and laboratory analyses EMCON used <br /> these data to evaluate the direction and gradient of groundwater flow beneath the site <br />' On June 22, 1994, a technician from GTI measured the depth to water and collected <br /> groundwater samples from monitoring wells MW-1 through MW-6 for subjective and <br /> laboratory analyses The field methods and procedures used are presented in an <br />' Attachment A The technician did not observe floating product or product sheen on <br /> sample~ collected troin the wells (see Table 1) <br />' The surveyed elevations of the top of casing and the depth-to-groundwater measurements <br /> (summarized in Table I) were used to evaluate the potentioinetric surtace beneath the site <br /> On June 22, 1994, the direction of groundwater flow was east with a gradient of <br />' approximately 0 004 (see Figure 2) The direction of groundwater flow is consistent with <br /> previous sampling events <br />' Groundwater samples from each well were analyzed for total petroleum hydrocarbons as <br /> gasoline (TPHG), and benzene, toluene ethylbenzene and total xylene isomers (BTEX) <br />' using Environmental Protection Agency Methods 5030 and 8020 using DHS/LUFT <br /> Method The samples were analyzed at GTEL Environmental Laboratories lnc, . in <br /> �AVh�(Af1}i[ISV1}t(lSll IU I-xm 94 p-t% 5 <br /> 1 <br /> 4 <br /> Ii <br /> I <br />