Laserfiche WebLink
Utility Clearance: Proposed drilling locations will be marked and their locations cleared through <br /> Underground Services Alert (USA) prior to drilling. <br /> Site Investigation: Two exploratory soil borings to be drilled using hollow stem auger drilling <br /> equipment are proposed at the locations shown on Plate 4. A Cambria geologist will supervise the <br /> drilling and describe encountered soils using the Unified Soil Classification System (USCS). Soil <br /> samples will be collected at five foot intervals for lithologic description. Soil sample intervals will be <br /> screened in the field for organic vapor by measuring head-space vapors using an organic vapor meter <br /> (OVM). An exploratory boring log will be prepared for each boring. Head-space vapor <br /> measurements will be recorded on the logs. <br /> Soil samples designated for chemical analysis will be retained in stainless steel or brass tubes. The <br /> tubes will be covered on both ends with Teflon sheets and plastic end caps. Soil samples will be <br /> labeled, entered onto a chain-of-custody record and placed into a cooler with ice for transport to a <br /> State of California certified laboratory for analysis. <br /> Monitoring Well Installation: The proposed soil boring located in Pacific Avenue will be converted <br /> to a ground water monitoring well and will be constructed of 2-inch diameter threaded Schedule 40 <br /> PVC well casing. The sandpack will be placed 1 to 2 feet above the top of the well screen followed <br /> by a 1 foot thick bentonite seal. A cement-grout seal will be placed above the bentonite seal up to <br /> grade. The well will be secured with a locking cap under a traffic rated well box. The wellhead <br /> elevation will be surveyed by a State of California licensed surveyor. A well completion detail will be <br /> prepared for the ground water monitoring well. Sampling of the newly-installed monitoring well will <br /> be conducted during the next regularly schedule quarterly ground water monitoring and sampling <br /> event. <br /> Chemical Analysis: Soil and ground water samples will be analyzed for TPPH according to EPA <br /> Method 8015 (modified), benzene, toluene, ethylbenzene, xylenes, and MTBE according to EPA <br /> Method 8020, and oxygenate compounds (TBA, MTBE, DIPE, ETBE, and TAME) by EPA Method <br /> 8260. <br /> Report Preparation: Following the receipt of analytical results from the laboratory, Cambria will <br /> prepare a written report describing field procedures, laboratory results, boring logs, and presenting <br /> conclusions and recommendations. <br /> The scope of work described in this work plan will be performed under the supervision of a registered <br /> professional engineer. <br /> 240-0854 4 <br />