25C - AGMT - RIGHT-OF-WAY DEMO SURVEY AND ENVIR ASMT SRVS

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in Leighton Consulting I (A6) Environmentd) Services ?- more than 500 projects in southern California. We have developed strong working relationships with Gregg Drilling and Millennium Environmental because of their knowledge of the required work and regulatory environment, their work ethic, and their s? cost-effective approach to project execution. In most cases, Leighton would utilize a direct-push rig to collect soil and initial grab as groundwater samples. This field methodology is less intrusive and considerably more cost- effective than drilling with hollow-stem auger rigs, and generates very little investigation- derived waste (IDW). When permanent groundwater monitoring wells are required, we will primarily use hollow-stem auger drilling equipment to advance soil borings for well Installation. We have installed thousands of groundwater monitoring wells from single completions in shallow water table aquifers to nested, multi-well completions in confined .., and multilayered aquifers. We have designed and installed monitoring wells intended for the recovery of various for petroleum hydrocarbons Including volatile organic compounds (VOCs), various light non-aqueous phase liquids (LNAPLs - floating product), dense non- aqueous phase liquids (DNAPLs), and other dissolved compounds. Leighton will obtain all necessary permits from the appropriate regulatory agency prior to installing any monitoring "` wells and will register the wells with the Department of Water Resources (DWR), as `„ required. All drilling will be performed under the oversight of a Professional Geologist (PG) 1W or Civil Engineer (CE) registered in the State of California. • Sampling. Soil and/or groundwater sampling will be conducted in accordance with federal, state, and local guidelines with the objective of obtaining representative samples of the subsurface materials. No two projects are alike, each requiring a thorough review of background information to establish an appropriate sampling plan. Leighton will include a site-specific sampling plan as part of the work plan document. "this sampling plan will ,.. identify the media to be sampled (e.g., soil, water, soil gas, etc.), the sampling ca methodology (e.g., drilling, trenching, push-probe, monitoring well, etc.), the sample- containers (e.g., glass jars, brass sleeves, Encoreem, VOA vials, etc.), preservatives, and sample handling and chain-of-custody procedures. 4157 .1 C21 CITY OF SANTA ANA I RIGHT OF WAY CONSULTING AND RELATED SERVICES ) 22 25C-94