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Indoor Environmental Air Quality Assessment <br /> <br />Environmental Solutions Group ● 7 Maple Leaf Drive, Ste 104, Greensboro, NC 27410 ● 336-373-1538 <br />www.Go-ESG.com <br />19 <br />• Handling of materials removed from the building or that will remain in the building: <br />o Certain items removed from the building require special handling for removal of fungal <br />spores. <br />o Hard-surfaced non-porous materials such as solid wood furniture, metal bed frames, non- <br />porous decorative items, and glass may be HEPA-vacuumed, wiped down with an EPA- <br />registered anti-microbial designed for wipe application, and HEPA-vacuumed one more <br />time to remove inactive fungal spores. Test furniture in an inconspicuous area prior to <br />wiping the entire piece with anti-microbial. <br />General Recommendations: <br />• Check for and document any areas of hidden damage and/or contamination during the <br />remediation process. Contact ESG if you suspect contamination beyond that documented in this <br />report. It is not unusual to find hidden areas of microbial growth or moisture damage when wet <br />building materials are being removed. <br />• The work areas should be left dry and visibly free from contamination and debris. <br />• Do not apply an encapsulant or other substance that will prohibit a visual inspection of the <br />building materials during the post-remediation verification (PRV) assessment. Encapsulants must <br />be applied after an acceptable PRV assessment. <br />• Seal the remediated areas to be clearance-tested after final cleaning to ensure entrance to the area <br />is prohibited. Only the hygienist or indoor air quality professional performing post-remedial <br />testing is to enter the contained areas. Critical barriers are to remain in place until certification is <br />issued by Environmental Solutions Group indicating that the building is safe for re-occupancy. <br />• Contact Environmental Solutions Group at 336-373-1538 to schedule post-remediation <br />verification testing of the remediated structure to certify that it is ready for continued restoration <br />and safe for occupancy. <br />Post Remediation Verification (PRV) Recommendations: <br />• All of the major safety, health, and remediation standards organizations recommend that a PRV, <br />also known as clearance testing, be conducted by a mold professional not affiliated with the <br />remediation firm. The Texas Guidelines require that the same equipment be used during the PRV <br />as during the pre-remediation inspection. It is highly advisable and in the best interest of the <br />property owner to follow these recommendations. <br />• Leave any HEPA filters running but turn off and remove non-HEPA containing dehumidifiers 48 <br />hours prior to the PRV. Leaving HEPA filters running until instructed by ESG is the preferred <br />method of protecting workers and building occupants. Leaving air-moving equipment in <br />operation has also been shown to provide the most accurate test results during the clearance <br />assessment. If HEPA machines are moved or shut down while the area is under negative <br />pressure, be sure the machines are properly shut off and HEPA filters are sealed in plastic to <br />avoid re-contamination prior to the PRV. <br />• The PRV assessment will include a visual inspection and collection of airborne particle load <br />(PM10) readings from several interior areas. ESG may also choose to collect a swab surface <br />sample of framing and/or floor system to be sure surface levels of fungal spores are at a normal <br />fungal ecology level as defined by the S520 standard. If any of the testing methods above do not <br />meet the specifications provided in the PRV assessment areas, re-cleaning of the remediated <br />area(s) is required. A typical PRV also includes a visual inspection for dust and mold residue, <br />confirmation that the source of the moisture has been corrected, and air sampling under normal <br />DocuSign Envelope ID: 8114697F-F41C-43F1-AFE2-ADC7016F0955