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Gabriel Gonzalez [EH] <br /> From: Gabriel Gonzalez [EH] <br /> Sent: Monday, November 24, 2014 1:54 PM <br /> To: Nuel Henderson [EH] <br /> Subject: 248 E Park St. (Canepa's Car Wash) <br /> 11/24/14 <br /> Hi Nuel, <br /> I've been reviewing reports for 248 E Park St., which was recently assigned to me. I am trying to get up to speed on the <br /> site and get the site up to speed with more current directive. <br /> In November 2013, the state recommended to us to direct the definition of the down gradient extent of groundwater <br /> contamination. It does not appear we have issued neither a directive pertaining to a groundwater monitoring schedule <br /> since the remediation start up in 2013 nor directives to stop sampling. Yet, it looks like AGE has deviated from the last <br /> directive in letter dated April 1, 2010. <br /> In Groundwater Monitoring Report- First Quarter 2014, AGE recommends to discontinue any future monitoring of non- <br /> impacted wells (flagged with sticky in report). After looking into the data in the report, I propose the following schedule <br /> for groundwater sampling: <br /> • Continue to not be sampled: MW-1, MW-3, MW-4, MW-6, and MW-7. <br /> • Resume sampling, semi-annually: MW-2 (it's impacted and down gradient) <br /> • Resume sampling, annually: MW-8 (shallow zone, low concentrations), MW-13 and MW-15 (shallow, <br /> historically low concentrations and recently ND) <br /> • Semi-annual or annual?: MW-5 (intermediate zone down gradient), MW-16 (2"" intermediate zone, low <br /> concentrations, down gradient but relatively far from UST) <br /> • Semi-annual: MW-9, MW-11, MW-14 (these three are screened in the 2nd intermediate zone, high impact), MW- <br /> 10, MW-12, MW-17 (these three are in the deep zone, down gradient, impacted) <br /> I am seeking your input/recommendations on the above schedule. In addition, which constituents should I include in the <br /> directive to have the water samples analyzed for? <br /> As far as further investigation needed?... <br /> • Shallow zone to the South/southwest? <br /> • Vt Intermediate zone east, north east of MW-S (screen 40-60)? <br /> • 2nd Intermediate and deep zones in all directions? <br /> • Any other areas? <br /> Remediation System (Dual Phase Extraction,water and vapor): <br /> Interim Remediation Work Plan (20 March 2012) appears to be the only source of a schedule for sampling the DPE <br /> system (Pages 9 and 10 of ten), proposed by AGE, and was responded to in EHD letter dated June 8, 2012 (flagged with <br /> Stinky in filal <br />