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.1. <br />i - <br />Jeanine Jones 2 .- April 30, 1936 <br />i <br />I <br />5 Development of the wells by the air surging method <br />proposed is unacceptable. Air surging can destroy some <br />of the wells' efficiency by forcing air into the <br />formation, causing "air lock". Air surging can also <br />introduce contaminants into the well and expose the <br />drillers to hazardous materials. It is recommended <br />that The Mark Group use mechanical development methods, <br />such as a surge block. <br />Section A.1.3 refers to "splits" and "duplicate" soil <br />samples. The description for duplicates is correct but <br />the last sentence on page A-4 regarding split samples <br />should be clarified. Split samples are a splitting of <br />the same sample, not a sample taken "nearest the one <br />initially selected" - this describes field duplicate <br />samples. <br />Section A.2.1 refers to the low levels of volatile <br />organic compounds (VOCs) at this site. The Department <br />of Health Services defines high levels of volatile <br />organics as concentrations above 10 ppm. There are <br />levels of VOCs higher than 10 ppm at this site. <br />Therefore, it is requested that wells be constructed of <br />stainless steel rather than PVC. <br />In the Safety Standard Operating Procedure there are <br />two different phone numbers for contacting the local <br />ambulance, 2222 and 464-4646. Can either number be <br />used? The name and phone number of the nearest <br />hospital or emergency facility should be added to the <br />listing of emergency phone numbers. <br />Where was the product/hazardous waste which IT <br />Corporation cleaned up taken? Copies of all manifests <br />should have been submitted in the report. <br />Have all health effects concerns with the local <br />population been dealt with and resolved? Any contact <br />with the local residents regarding health effects <br />should be documented in followup reports. <br />MAR: jka