Laserfiche WebLink
USTCOGC88-74 <br /> Environmentl Health Division <br /> San Joaquin Local Health District <br /> Page 2 <br /> The Modified California Sampler consists of an outer sample barrel <br /> and an inner, thin-walled cylinder or set of rings. For this <br /> application three 6-inch long brass sleeves will be placed end to <br /> end. As soil is forced into the sampler by the driving action <br /> described above, a soil sample will be collected in the sleeves. <br /> After removal from the boring and detachment from the rod, the <br /> sampler will be dismantled and the inner sleeves containing the <br /> soil sample removed. The lower sleeve will be sealed by covering <br /> the ends with aluminum foil, placing plastic end caps over the foil, <br /> and securing the caps with duct tape. Composite samples may also be <br /> obtained by packing soil from 2 or 3 sampling locations into 16-ounce <br /> glass jars with Teflon lids. All samples will be labeled and placed <br /> in cold storage until delivery to the analytical laboratory. <br /> Soil from the upper 6-inch ring of drive samples will be examined in <br /> the field and visually logged based on the Unified Soil Classification <br /> System. To avoid cross-contamination between samples and boreholes, <br /> all sampling equipment will be washed between uses with water and TSP <br /> brand soap solution and rinsed twice with tap water. Chain-of-custody <br /> procedures will be followed and copies of the forms will be included <br /> in the final report. <br /> Select soil samples will be monitored in the field for presence of <br /> volatile organic vapors using a Photovac Tip T photoionization detector <br /> (P.I.D.) , also known as an Organic Vapor Meter (OVM) . The Photovac I <br /> utilizes a 10.6 eV ultraviolet lamp to detect potential hydrocarbon <br /> vapors during sampling. Head space measurements will be performed by <br /> collecting a sample of soil (200-300 grams) and placing it into a one- <br /> quart resealable plastic baggie. The plastic baggie is sealed, and <br /> the sample is disaggregated and allowed to equilibrate in the air <br /> space (head space in the baggie) for approximately 5 to 10 minutes. A <br /> corner of the plastic baggie will then be opened and the OVM probe <br /> inserted into the top of the baggie using care to reduce the potential <br /> loss of volatiles. The OVM display, in parts per million (ppm) relative <br /> to benzene, will be observed until an approximately stable reading is <br /> obtained and recorded. <br /> IDA YMENT <br /> REGF1VED <br /> AUG ,, . ib o;, <br /> ENVIRONMENTAL HEALTH. <br /> HERMIT ISPNICES <br />