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San Joaquin County, Local Oversight Program <br /> April 15, 2003 <br /> Page 3 An el 0S <br /> MtBE was found in six of the monitp i' g wells as indicated in Table 3 and Figure 3 T ee of the <br /> monitoring wells (MW-4, MW-5, d W-8) were with concentrations above theum <br /> contaminant level(primary drinking water standard) of 13 µg/L One (MW-7 at 8 ) was <br /> between the primary and secondary drinking water standard (5 0 gg/L) and one (MW-3 at 1 1 <br /> µg/L) was between the detection limit of 0 5 and the secondary drinking water standard <br /> TBA was detected m the four wells where the MtBE exceeded the primary drinking water <br /> standard MW-4 54 µg/L; MW-5 55 gg/L, MW-6 6 3 gg/L, and MW-8 52 gg/L TAME was <br /> detected in the samples from MW-5 (2.9 pg/L) and MW-8 (1 5 µg/L) r- <br /> The other U S EPA Method 8260B Fuel Oxygenates were not detected above their respective <br /> detection lints in groundwater samples as indicated in Table 3 Ethylene dibromnde and 1,2- <br /> Dnchloroethane were below their respective detection limits <br /> The April 11, 2002 letter from the San Joaquin County, Environmental Health Department <br /> (EHD) was reviewed immediately prior to preparation of this groundwater monitoring report <br /> For all future monitoring events the required 48-hour notice to EHD will be provided The <br /> following schedule will be observed for groundwater elevation monitoring and sampling during <br /> the remainder of 2003 <br /> Second Quarter 2003 Sampled Mid 2 weeks of May Report by July 15 <br /> Third Quarter 2003 Sampled Mid 2 weeks of August Report by October 15 <br /> Fourth Quarter 2003 Sampled Mid 2 weeks of November Report by January 15 <br /> The EHD will be appraised of the ownership history of the property in a separate subrnuttal <br /> The files of Parker Environmental Services will be reviewed to address the concerns of the EHD <br /> expressed in the third paragraph of the April 21, 2002 letter Due to the year abeyance of the <br /> program awaiting a Letter of Commitment, the due date for a letter report clarifying Parker's <br /> efforts or a work plan as specified is assumed to be June 10, 2003 <br /> Please do not hesitate to email h2o eol e,attbi_com or call the undersigned at 925-373-9211 <br /> and/or telefax at 925-373-9222 should you have any questions <br /> ���F D GF,Ql <br /> Sincerely, wg0. <br /> GARY D 1.3 E �►� ��p4ED Ggo <br /> No 1159 0 <br /> Gary D Lowe, R G (3768), C E G (1559) ��� u <br /> C HG (127) <br /> Principal, Hydrogeolognst OP <br /> iH2OGEOL A GroundWater Consultancy <br /> H2OGEOL A GROUNDWATER CONSULTANCY <br />