09-12-11 Regular Meeting of La Porte City Council

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Cost Estimate for Geotechnical Engineering Services Irerracon Drainage Ditch Improvements— Battleground Estates a La Porte, Texas July 5, 2011 n Terracon Document fro. P91110112 Page 2 B. SCOPE OF SERVICES A brief summary of the services to be provided by Terracon is presented in the following paragraphs. Field Program, The field program is planned to consist of drilling six (6) test borings to depths of 20 feet below existing grade along the proposed drainage ditch improvements, and two test borings to depths of 10 feet below existing grade (top of paving) for the roadside ditches along Bois D`Arc Drive. The total drilling footage is planned to be 140 feet. Soil samples will generally be collected utilizing either open -tube samplers or Standard Penetration Test, Once the samples have been collected and classified in the field, they will be properly prepared and placed in appropriate sample containers for transport to our laboratory. We can locate the borings by measuring distances from existing streets and /or site features shown on the provided drawings, without the use of survey equipment. Boring depths will be measured from existing grade. The boring locations will be backfilled with soil cuttings and patched with asphaltic concrete (where needed). The drilling services for this project will be performed by a drilling subcontractor or Terracon`s in- house drillers. We plan to use all- terrain vehicle (ATV)- mounted drilling equipment to access the boring locations. This scope of services assumes that the site can be accessed during normal business hours and does not include services associated with site clearing, location of on -site underground utilities, or the use of special equipment for unusually soft or wet surface conditions. If such conditions are known to exist on the site, Terracon should be notified so that we may adjust our scope of services and estimated fees, if necessary. Terracon will notify DIG TESS, a free utility locating service, to help locate public utilities within the vicinity of the site. If underground utilities are known to exist within the site, Terracon should be notified so that we may review utility plans and help avoid the existing lines. Terracon cannot be responsible for damage to unmarked and/or unlocated utilities for which we are unaware orthat are improperly located. Laboratory Testin The sample classifications will be reviewed and a laboratory testing program will be assigned which will be specific to the project requirements and the subsurface conditions observed, The testing program could include, but may not be limited to, moisture contents, unit dry weights, Atterberg limits, compressive strength tests and grain -size analyses. In addition, we plan to include crumb tests, pinhole dispersion tests, and consolidated undrained triaxial tests in accordance with HCPCD requirements. Reliable n Responsive Q Corivottieltt o Innovative