Laserfiche WebLink
Metadata
Document management portal powered by Laserfiche WebLink 9 © 1998-2015 Laserfiche. All rights reserved.
0 0 <br /> Monitoring Well Installation Work Plan, Revision 2 <br /> March 25, 2008 <br /> Page 2 of 5 <br /> SCOPE OF WORK <br /> Pre-field Activities <br /> Subsequent to Work Plan approval, SGI will perform pre-field activities including preparation of a <br /> site-specific Health and Safety Plan (HASP), submittal of a Drilling Permit Application, utility <br /> locating in conjunction with final selection of well locations, and coordination with the City. The site- <br /> specific HASP will comply with federal OSHA regulations (29 CFR, Section 1910.120). All of SGI <br /> personnel and subcontractors associated with the project will be required to be familiar and comply <br /> with all provisions of the HASP. An application for the installation of each groundwater monitoring <br /> well will be prepared and submitted along with appropriate fees to the San Joaquin County <br /> Environmental Health Department. Each proposed monitoring well location will be pre-marked, <br /> after which Underground Services Alert (USA) will be notified of pending drilling activities at the <br /> marked locations. Additionally, a private utility locator will be contracted to check each proposed <br /> drilling location for utilities and other subsurface obstructions. It is anticipated that USA and their <br /> affiliated companies will mark the offsite locations of underground utilities in the vicinity of the <br /> proposed monitoring well. Results of utility locating by both the private utility locator and USA will <br /> be reviewed and the final location of each monitoring well will be adjusted as necessary. Prior to <br /> the start of drilling activities, SGI will contact the City to coordinate items such as site access and <br /> the retention of soil cores from the boring installations. <br /> Well Installation <br /> Preliminary locations for the three monitoring wells are shown on Figure 1. Indicated next to each <br /> well location is the installation priority. If a well needs to be eliminated from the program because <br /> of funding limitations, the well with the lowest priority should be eliminated first. Each well will be <br /> installed using a sonic drilling rig equipped with a 6-inch diameter casing advanced into the <br /> subsurface via high frequency vibrations. A continuous soil core will be recovered using a 4-inch <br /> diameter sampler advanced ahead of the casing. (If requested ahead of time, the cores will be <br /> boxed and provided to the City for storage and future reference.) A soil-boring log will be prepared <br /> from observations of the recovered soil core. The soil log will include preliminary grain size <br /> classification, color, consistency, soil lithology, degree of moisture, and estimated percentages of <br /> gravel, sand, sift, and clay. Soil type classification will be based the Unified Soil Classification <br /> System (USCS). Color will be based on the Munsell color chart. Well construction information will <br /> be included on the log or on a separate well construction detail form. <br /> Each well will be constructed to a depth of 200 feet which is located within the intake zone of the <br /> City supply wells. The wells will be constructed using 10-foot sections of flush-threaded Schedule <br /> 40 PVC casing. The bottom 20-feet of the well will be constructed of 10-foot lengths of 2-inch- <br /> diameter, machine-slotted (0.010-foot slots),flush-threaded Schedule 40 PVC well screen. <br /> The Source Croup,Inc. <br />