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EpE.w. <br /> Environmental/Engineering Consuftonis <br /> April 20, 1993 <br /> Job No. 4780200 ��V� MAY P b 1qq� <br /> PERM T SERV ME,q�rH <br /> ' NTAL <br /> Quikrete of Northern California ��RVIC�S <br /> 6018 Stewart Avenue <br /> ' Fremont, California 94538 <br /> ATTN: Mr. Allen Law <br /> ' SUBJECT: GROUNDWATER GRAB SAMPLE ANALYSIS <br /> 820 South American Street <br /> Stockton, California <br /> ' Gentlemen: <br /> ' Pursuant to our workplan dated December 23, 1992, EZC, Inc. has completed a <br /> groundwater sampling and analysis investigation at the aforementioned subject site. <br /> The purpose of this investigation was to assess the likelihood that groundwater <br /> beneath the site has been adversely impacted by the former presence of hydrocarbons <br /> contained within Underground Storage Tanks (USTs). <br /> ' A groundwater grab sample was collected at the time of this investigation and <br /> analyzed for petroleum hydrocarbons in the form of gasoline, diesel, and their <br /> constituents. The laboratory reported that the groundwater sample collected at the <br /> ' subject site has high concentrations of Total Petroleum Hydrocarbons in the form of <br /> gasoline (TPHg), Total Petroleum Hydrocarbons in the form of diesel (TPHd), and their <br /> VOC constituents Benzene, Toluene, Ethyl benzene, and Xylenes (BTEX). Based on <br /> ' the laboratory report for the groundwater sample collected for analysis, field <br /> observations and our professional judgement, the groundwater at the site has been <br /> adversely impacted by TPHg, TPHd and BTEX which has been released from the <br /> ' former USTs. <br /> Should you have any questions or require supplemental information, please do not <br /> ' hesitate to contact us. <br /> ' Sincerely r_ l <br /> i <br /> Robb Welch ndall W. Price, CEGVA <br /> ' Staff Geologist President <br /> ' 1220 Gnssman Avenue. Suite 200•5unnyvale. Califomia 94089•[4081747-1414•FAX(406]745-1089 <br />