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APP/SSHP Soil Excavation at California National Guard Armory Lodi, California Excessive and dangerous heat indices occur mostly during the summer months with the abundance of moisture and increased heat. When Ambient Temperatures reach > 70 degrees F and site workers are wearing semi- impermeable (Saranex, Tyvek) or impermeable clothing, or otherwise when Ambient Temperatures >80 F initiate the following steps: • Acclimate the body to the working environment. • Drink cool water to replace body fluids lost during sweating. Site personnel taking prescribed heart and/or high blood pressure medication may require electrolyte replenishing liquids to combat heat stress. It is recommended that each individual taking prescribed heart and/or high blood pressure medication consult his personal physician prior to consuming these drinks. • Take rest breaks as frequently as necessary to prevent personal distress and development of symptoms. • Personal monitoring can be done by checking the heart rate; recovery heart rate; or the ear/oral temperature. The recovery heart rate can be checked by comparing the pulse rate taken at 30 seconds (P,) with the pulse rate taken at 2.5 minutes (P3) after the rest break starts. The two pulse rates can be interpreted using the Heart Rate Criteria below: HEART RATE RECOVERY CRITERIA Difference between Heart rate recovery pattern 11n3 P, and P3 Satisfactory recovery T<9 -- High recovery (Conditions may require further study) 10 No recovery (May indicate too much stress) _150F <10 • Ear or oral temperature can be checked with an oral thermometer with disposable probe covers, an ear probe or temporal sensors after work but before the employee drinks water. If the ear-insertable or oral temperature taken under the tongue exceeds 37.6°C, shorten the next work cycle by one third. • Use the Heat Index Chart and take necessary precautions. OTIE 29