User Manual - Durham Geo Enterprises
Contents
1. Multiple Interval Deployment There are two basic methods for placing multiple HydraSleeves in a well to collect samples from different levels simultaneously ATTACHED END TO END Figure 4 Figure 4 v Top of well screen To place 2 or 3 stacked HydraSleeves for vertical profiling use one of the methods described above to locate the bottom sam pler Attach the bottom of the top sampler to the top of the following HydraSleeve s with a carefully measured length of suspen sion cable Connect the weight to the bot Separate HydraSleeves tom sampler Note if numerous Pi pee eu HydraSleeves are attached to a tether more between samplers weight may be required than with a single sampler ATTACHED TO A SINGLE TETHER Figure 5 To use 3 or more samplers simultaneously Figure 5 v we recommend attaching them all to a ___ Top of well screen tether for support to prevent the sampling string from pulling apart The weight is attached to a single length of suspension line and allowed to rest on the bottom of the well The top and bottom of each Separate HydraSleeves HydraSleeve are attached to the tether at tne Geshe spacing 9y measuring along the the desired sample intervals Cable tie or tether when attaching Stainless steel clips supplied work well for samplers attaching the HydraSleeves to the line Simply push one end of the clip between strands of the rope at the desired point before att2. YDRAoleeve US Patent No 6 rs pending Field Man Copyright 2004 Geolnsight Introduction The HydraSleeve groundwater sampler can be used to collect a representative sample for most physical and chemical parameters without purging the well It collects a whole water sample from a user defined interval typically within the well screen without mixing fluid from other intervals One or more HydraSleeves are placed within the screened interval of the monitoring well and a period of time is allocated for the well to re equilibrate Hours to months later the sealed HydraSleeve can be activated for sample collection When activated HydraSleeve collects a sample with no drawdown and minimal agitation and displacement of the water col umn Once full the one way reed valve collapses preventing mixing of extraneous non repre sentative fluid during recovery Assembly Assembling the HydraSleeve is simple and can be done by one person in the field tak ing only a minute or two Remove sleeve and the 2 clips from package and unroll the sampler Attach the small clip by inserting the prongs into the hole at the bottom of the sampler Slide the clip around so that the open end with the prongs faces away from the sample sleeve Attach the reusable weight to the clip at the bot tom of the sampler Attach the large clip by inserting the prongs into the holes at the top of the samp
3. aching the clip to the HydraSleeve Sample Collection The HydraSleeve must move upward at a rate of one foot per second or faster about the speed a bailer is usually pulled upward for water to pass through the check valve into the sample sleeve The total upward distance the check valve must travel to fill the sample sleeve is about 1 to 2 times the length of the sampler For example a 24 inch HydraSleeve needs a total upward movement of 24 to no more than 48 inches to fill The upward motion can be accomplished using one long continuous pull several short strokes or any combination that moves the check valve the required distance in the open position A special technique is used for sampling low yield wells CONTINUOUS PULL Figure 6 Figure 6 y Pull the HydraSleeve continuously upward Top df nen from its starting point at a constant 1 to 2 sampler ful Ge feet per second until full This method usu ally provides the least turbid samples and is Pull the HydraSleeve analogous to coring the water column from continuously upward the bottom up s e e jj mene The sleeve will fill Note When using this method the screen e aa interval should be long enough so the sampler its length fills before exiting the top of the screen SHORT STROKES Figure 7 Figure 7 Pull the sampler upward at about 1 to 2 Top of well screen feet per second for the length of the sam nea a pler and let it drop back t
4. ine the exact depth Lower the weighted HydraSleeve into the well and let it touch the bottom Very slowly less than 1 2 foot per second bo well saen raise the sampler to the point where the check valve is at the depth the sample is to be collected Attach the suspension line to Figure 2 the top of the well to suspend it at this Sample depth depth It is often easier to measure a few Hef Lower HydraSleeve feet from the bottom of the well up to the nin sample point than it is to measure many 2 Right Slowly lt 6 sec pull feet from the top of the well down y A ag well gt equilibrates Collect sample Alternately the sampler can be left on the Alternately bottom until the well re equilibrates For dre Ak phat ent aire sampling it can be very slowly pulled lt 1 2 then slowly pull into position and begin sampling fps to sampling depth then activated see Sample Collection p 6 to collect the sample and retrieved to the surface 3 BOTTOM ANCHOR Figure 3 Determine the exact depth of the well Calculate the distance from the bottom of the well to the desired sampling depth Attach an appropriate length anchor line between the weight and the bottom of the sampler and lower the assembly until the weight rests on the bottom of the well allowing the top of the sampler to float at the correct sampling depth Figure 3 Anchor line v Top of well screen
5. ler Attach the suspension line to the upper clip Tie Sampler is ready to insert into the well Placing the HydraSleeve s To collect a representative groundwater sample without purging the well must be allowed time to re equilibrate after placement of the sampler When any device is lowered into a well some mixing of the water column occurs The diameter of the device and its shape greatly affect the degree of mixing The flat cross section of the empty HydraSleeve minimizes the dis turbance to the water column as the sampler is lowered into position reducing the time need ed for the well to return to equilibrium There are three basic methods for holding a HydraSleeve in position as the well equilibrates TOP DOWN DEPLOYMENT Figure 1 Measure the correct amount of suspension Figure 1 line needed to hang the top of the v HydraSleeve s at the desired sampling Suspend ben __ Top of well screen depth in most cases this will be at the bot ie ai tom of the sampling zone The upper end rately measuring the tether length of the tether can be connected to the well cap to suspend the HydraSleeve at the cor rect depth until activated for sampling Note For deep settings it may be difficult to accurately measure long segments of sus pension line in the field Factory prepared custom suspension line and attachment points can be provided BOTTOM DEPLOYMENT Figure 2 Sound the well to determ
6. o compress the sampler in the bottom of the well if needed for an extremely short water column With a top weight the check valve is pushed down to within a foot of the bottom of the well v Figure 8 Rapidly cycle sampler up and down approx 6 inches Top point of cycle Bottom point of cyde f Figure 9 Sampler full Pull the HydraSleeve continuously upward from the starting point at a constant speed Top weight v Top of well screen Sample interval Top of well screen Sample interval Sample Discharge The best way to remove a sample from the HydraSleeve with the least amount of aeration and agitation is with the short plastic discharge tube included First squeeze the full sampler just below the rigid plastic top ring to expel water resting above the flexible check valve Photo 1 top left Then push the pointed discharge tube through the polyethylene sleeve at the base of the top ring Photo 2 middle left Discharge the sample into the desired con tainer Photo 3 bottom left Raising and lowering the bottom of the sampler or pinching the sample sleeve just below the discharge tube will control the flow of the sample The sample sleeve can also be squeezed forcing fluid up through the discharge tube similar to squeezing a tube of toothpaste With a little practice and using a flat surface to set the sample containers on HydraSleeve sampling bec
7. o the starting point Repeat the cycle 3 to 5 times Pull the HydraSleeve up the length of the This method provides a shorter sampling sampar ea ps anu sample interval allow to drop back to interval than the continuous pull method the starting point above and usually reduces the turbidity ira es added levels of the sample below that of numer ous rapid short cycles below The sample comes from between the top of the cycle and the bottom of the sampler at its lowest point Bottom point of cycle RAPID SHORT CYCLES Figure 8 Cycle the HydraSleeve up and down using rapid short strokes 6 inch cycle at a mini mum of 1 cycle per second 5 to 8 times This method provides the shortest sampling interval Dye studies have shown that when using this method the sample flows into the check valve from along the length of the sampler and immediately above the check valve The sample interval is from the bot tom the sampler at its lowest point in the cycle to the top of the check valve at the peak of the cycle SAM PLING LOW YIELD WELLS Figure 9 HydraSleeve provides the best available technology for sampling low yield wells When pulled upward after the well re equili brates the HydraSleeve will collect a water core from the top of the sampler to about its own length above that point The sample is collected with no drawdown in the well and minimal sample agitation An optional top weight can be attached t
8. omes a one person operation Geojnsight 1680 Hickory Loop Suite B Las Cruces NM 88005 Phone 1 800 996 2225 e 1 505 523 5799 Fax 1 505 523 0789 www geoinsightonline com KentCordry aol com
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