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" <br /> Gabriel Glez <br />� <br /> From: Gabriel Gonzalez [EH] <br />^ Sent: Thursday, February D6, JOlS4:l9pM <br />] To: 'michadv|ach@cmnncasLnet' <br /> Subject: RE� 3���h �|�mia �u� <br /> j . . <br />] <br /> Attachments: Geo-Well GeoTmckerSubmittals (3UUS Ca|Jonnio).bmp; 3OOSCalifornia �� Stockton <br /> 1 GVVK4R1st Quarter Response U6O512.pdf, Excerpts K4VVSampling Guide|ines .pdf <br /> Hi Mike, <br /> Thank you for your response.To provide you with the EHD field reports and previous reports containing MWs-1,2, and 3 <br /> 1 <br /> logs in our archive please fill out the Public Records Release Application and submit the completed form to me(via <br />| <br /> email attachment is acceptable).The form is located on our website here: <br /> i <br />| <br />� <br /> EHD letter dated June 5, 2012, requested Geo_Well (e.g. depth to water,total depths) since 2005. Please see the last <br /> paragraph mfthe letter attached bothis email. For example, there are groundwater monitoring reports onGemTrscker <br /> from 2006,2007, 2008 which do not have corresponding Geo Well data uploaded. Please see the attached image which <br /> highlights the Geo-Well data currently pnGeoTnyckerfor the subject site. <br /> Regarding taking total depth measurements prior to sampling, it is good practice.The San Joaquin County, California <br /> Leaking Underground Fuel Tank(LUFT),and U.S.EPA guidance documents for monitoring well sampling recommend <br /> measuring total depth before sampling. Measuring total depths regularly can give information such as how much <br /> sediment has accumulated inthe casing to determine if the well should be redeveloped and will provide more accurate <br /> purge volume calculations. I acknowledge your concern of cross contamination. Please keep in mind that measuring <br /> tapes/weights should be decontaminated up to the length which was inserted into the casing,whether or not the tape <br /> was taken tototal depth orjust tothe depth ofwater. Please seethe attached excerpts from the aforementioned <br /> documents. <br /> Full versions of the LUFT Manual and U.S.EPA documents can be found at the following webpages: <br /> |f| can provide any more information, please let meknow. <br /> Sincerely, <br /> Gabriel Gonzalez <br /> From: Michael Vlach [nnai|bo:nnichae|x|ach@cnnnoosL.OeO <br /> Sent: Thursday, February 26, 2O15 8:55 AM <br /> To: Gabriel Gonzalez [EH] <br /> Subject: RE: 3ODSouth California Street <br /> 1 t <br />" <br /> 1 <br />